JP6545577B2 - Combustor and fuel cell module - Google Patents

Description

  The present invention relates to a combustor and a fuel cell module.

  Conventionally, a solid oxide fuel cell stack, a reforming unit that reforms a raw fuel gas to generate a reformed gas to be supplied to the fuel cell stack, and a stack exhaust gas discharged from the fuel cell stack are burned. There is known a fuel cell module provided with a combustion unit.

  In addition, there is a fuel cell module of this type in which the combustion unit is configured of a single combustor (see, for example, Patent Document 1). In this fuel cell module, the stack exhaust gas containing the unreformed raw fuel gas and the oxidant gas is burned in the combustor at the start-up of the fuel cell module at start-up, and the fuel cell stack is not used for power generation at the time of power generation. The stack exhaust gas containing the quality gas and the oxidant gas is burned in the same combustor as at start-up.

  As described above, when the combustion unit is configured by a single combustor, stack exhaust gases having different properties, compositions, and the like at the time of startup and at the time of power generation are burned by the single combustor. However, in the case of such a configuration, there is a problem in the ignitability and the combustion stability in the combustor, such as the unreformed raw fuel gas at the time of startup is difficult to ignite and easily blows out the flame.

  Therefore, the combustion unit is composed of a pair of combustors, and one combustor burns the stack exhaust gas containing unreformed raw fuel gas and oxidant gas at start-up, and the other combustor burns fuel cells at the time of power generation There has been proposed a fuel cell module that burns stack exhaust gas containing reformed gas and oxidant gas that has not been used for power generation in the stack (see, for example, Patent Documents 2 and 3).

  However, when the combustion unit is constituted by a pair of combustors, two systems of gas supply paths are required for the pair of combustors, so the structure of the combustion unit and the periphery thereof becomes complicated, and the size and cost increase. Cause of

  In addition, although a fuel cell module (see, for example, Patent Document 4) including a catalytic combustor that completely burns the unburned reformed gas on the downstream side of the combustor has also been proposed, Cause the complexity and cost of

  Therefore, it is ideal that stack exhaust gases having different properties and compositions can be stably burned by a single combustor at the time of start-up and at the time of power generation. In addition, although the above is a subject of the combustor in a fuel cell module, the said subject may arise also in the combustor in apparatuses other than a fuel cell module.

JP, 2011-222136, A JP, 2014-78348, A JP, 2014-72026, A JP 2002-83620 A

  The present invention has been made in view of the above circumstances, and an object thereof is to stably burn the mixed gas even when the property, composition, and the like of the mixed gas in which the fuel gas and the oxidant gas are mixed are different. It is an object of the present invention to provide a combustor capable of realizing miniaturization and cost reduction while being capable of

  Another object of the present invention is to provide a fuel cell module which can simplify the structure of the combustor and the periphery thereof and realize miniaturization and cost reduction.

  In order to achieve the above object, a combustor according to the present invention includes a combustion chamber in which a mixed gas in which a fuel gas and an oxidant gas are mixed is burned, and an axial one side of the combustion chamber is adjacent to the combustion chamber A cylindrical combustion chamber peripheral wall having a fuel gas chamber to which the fuel gas is supplied from the outside, and an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside; A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber peripheral wall inside the combustion chamber peripheral wall and partitioning the fuel gas chamber and the oxidant gas chamber, and around the fuel gas chamber partition wall It is provided annularly, and is provided at an oxidant gas chamber partition wall which divides the combustion chamber and the oxidant gas chamber, and at an end of the fuel gas chamber partition wall on the combustion chamber side, the combustion of the fuel gas by the combustion The fuel gas into the oxidant gas chamber A fuel gas nozzle that diffuses from the inside to the outside in the radial direction of the oxidant gas chamber partition wall over the entire circumference of the wall, and the oxidant gas chamber partition wall is formed radially around the central axis of the combustion chamber And a plurality of oxidant gas nozzles for injecting the oxidant gas into the combustion chamber to mix the oxidant gas with the fuel gas, and the oxidant gas chamber among the plurality of oxidant gas nozzles. If the oxygen necessary for the combustion of the mixed gas is sufficient with the oxidant gas jetted from the oxidant gas nozzle located radially inward of the partition wall, it is located radially inward of the oxidant gas chamber partition wall The mixed gas is generated by mixing the oxidant gas ejected from the oxidant gas nozzle and the fuel gas ejected from the fuel gas nozzle, and the plurality of oxidant gas nozzles are generated. In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located on the radially inner side of the oxidant gas chamber partition wall, the oxidant gas chamber partition wall The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the inner side to the outer side in the radial direction and the fuel gas jetted from the fuel gas nozzle.

  According to this combustor, the jet stream of the fuel gas ejected from the fuel gas nozzle is diffused from the inside to the outside in the radial direction of the oxidant gas chamber partition wall over the entire circumference of the oxidant gas chamber partition wall. A plurality of oxidant gas nozzles arranged radially around the central axis of the combustion chamber are formed on the oxidant gas chamber partition wall, and a jet of the fuel gas diffused along the oxidant gas chamber partition wall The fuel gas and the oxidant gas can be effectively mixed because the fuel gas and the oxidant gas can be effectively mixed. Thus, even when the properties, composition, and the like of the mixed gas in which the fuel gas and the oxidant gas are mixed are different, the mixed gas can be stably burned.

  Also, for example, when the air ratio is high and the flow rate of the oxidant gas is excessive to the flow rate of the fuel gas, the oxidant located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles The oxygen necessary for the combustion of the mixed gas is sufficient with the oxidant gas ejected from the gas nozzle. In this case, the mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located on the radially inner side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. , Mixed gas is burned. The jet stream of the oxidant gas jetted from the oxidant gas nozzle located radially outside the oxidant gas chamber partition wall is mixed with the combustion exhaust gas generated by the combustion of the mixed gas and discharged from the combustion chamber.

  On the other hand, when the flow rate of the fuel gas is large and the combustion amount is large, the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles is a mixed gas. Lack of oxygen required for combustion. In this case, the mixed gas is produced by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Is generated and the mixed gas is burned.

  As described above, the mixed region of the fuel gas and the oxidant gas is widely formed on the surface of the oxidant gas chamber partition wall, and the flame is fixed on the surface of the oxidant gas chamber partition wall, so that the flame extends in the radial direction of the combustion chamber. And the flame length in the axial direction of the combustion chamber can be shortened. Therefore, since the axial length of the combustion chamber can be shortened, downsizing and cost reduction of the combustor can be achieved.

  Furthermore, even if the air ratio and the amount of combustion change, the mixing area of the fuel gas and the oxidant gas and the flame area change so as to maintain the optimum combustion. And a stable short flame combustion can be obtained in the wide air ratio range from high air ratio to high air ratio (for example, about λ = 5).

  In the combustor of the present invention, the fuel gas nozzle may be formed by an opening on the combustion chamber side in the cylindrical fuel gas chamber partition wall.

  According to this combustor, since the fuel gas nozzle is formed by the opening on the combustion chamber side in the cylindrical fuel gas chamber partition wall, the structure of the fuel gas nozzle can be simplified and the cost can be further reduced. be able to.

  The combustor according to the present invention may further include a fuel gas chamber top surface partition wall facing the fuel gas nozzle with a gap.

  According to this combustor, the direction of the jet of the fuel gas ejected from the fuel gas nozzle is directed radially outward of the oxidant gas chamber partition wall by the fuel gas chamber top surface partition wall facing the fuel gas nozzle with a gap. You can turn it precisely. Thus, the fuel gas can be more effectively diffused from the radially inner side to the outer side of the oxidant gas chamber partition wall.

  Further, in the combustor according to the present invention, a cylindrical projecting wall which protrudes toward the combustion chamber with respect to the oxidant gas chamber partition wall is formed at an end of the fuel gas chamber partition wall on the combustion chamber side. A fuel gas chamber top surface partition wall for dividing the combustion chamber and the fuel gas chamber is provided at the projecting end of the cylindrical projecting wall, and the fuel gas nozzle is formed in the circumferential direction of the cylindrical projecting wall A plurality of the cylindrical protruding walls may be formed at intervals.

  According to this combustor, a plurality of fuel gas nozzles are formed on the cylindrical projecting wall at intervals in the circumferential direction of the cylindrical projecting wall, so the radial direction of the oxidant gas chamber partition wall from the plurality of fuel gas nozzles The fuel gas can be jetted outward. As a result, the jet direction of the fuel gas prevents the jet of the fuel gas from directly hitting the jet of the oxidant gas, and the flow rate of the fuel gas is accelerated by using the pressure loss of the fuel gas nozzle to oxidize the fuel gas. It is possible to diffuse from the radially inner side to the outer side more distantly of the gas chamber partition wall.

  In the combustor according to the present invention, the plurality of oxidant gas nozzles may be an oxidant gas nozzle row in which a plurality of the oxidant gas nozzles are arranged in the radial direction of the oxidant gas chamber partition wall. A plurality of fuel gas nozzles may be formed in the direction, and each of the plurality of fuel gas nozzles may be disposed between the oxidant gas nozzle rows adjacent in the circumferential direction of the oxidant gas chamber partition wall.

  According to this combustor, since each of the plurality of fuel gas nozzles is disposed between the oxidant gas nozzle rows adjacent in the circumferential direction of the oxidant gas chamber partition wall, the fuel gas nozzles are diffused along the oxidant gas chamber partition wall The jet stream of the fuel gas can be more effectively involved by the jet stream of the oxidant gas ejected from the plurality of oxidant gas nozzles. Thereby, the fuel gas and the oxidant gas can be mixed more effectively.

In the combustor according to the present invention, the oxidant gas chamber is in communication with the oxidant gas chamber, the oxidant gas is supplied from the oxidant gas chamber, and the oxidant gas supplied from the oxidant gas chamber is the same as the oxidant gas chamber. An oxidant gas mixing channel mixed with the fuel gas jetted from a fuel gas nozzle, and the fuel gas jetted from the fuel gas nozzle and mixed with the oxidant gas by the oxidant gas mixing channel A gas jet nozzle may be provided which jets radially outward of the oxidant gas chamber partition wall.
Further, a peripheral wall formed around the cylindrical projecting wall and projected from the radial inner end of the oxidizing gas chamber partition wall in the same direction as the cylindrical projecting wall and connected to the fuel gas chamber top surface partition wall The oxidizing gas mixing channel may be formed between the cylindrical projecting wall and the peripheral wall, and the gas jet nozzle may be formed in the peripheral wall.

  According to this combustor, since the fuel gas mixed with the oxidant gas is ejected from the oxidant gas mixing flow path from the gas ejection nozzle, the oxidant gas is mixed with the fuel gas. The spouting speed can be increased. Thereby, the combustibility of the mixed gas can be enhanced, and the flame and the flue gas can be made to easily flow to the outer peripheral side of the combustion chamber. For example, when the flow passage is provided around the combustor The heat of the combustion exhaust gas can be efficiently transmitted to the gas flowing through the flow path.

  Further, in the combustor according to the present invention, the combustion exhaust gas generated in the combustion chamber flows into the combustion chamber peripheral wall and is disposed on the other side in the axial direction of the combustion chamber while being provided inside the combustion chamber peripheral wall. A combustion chamber wall which forms an inlet portion of a combustion exhaust gas flow path, and extends from the combustion chamber wall toward one axial direction side of the combustion chamber and diameter-expanding toward the other axial direction side of the combustion chamber You may provide with the rectification | straightening part formed in cone or dome shape.

  According to this combustor, at the end portion on one side in the axial direction of the wall of the combustion chamber, a flow straightening portion extending toward the one side in the axial direction of the combustion chamber is formed. The straightening portion is formed in a conical or dome shape whose diameter increases toward the other axial side (downstream side) of the combustion chamber. Thus, the flame and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber, so the flame length in the axial direction of the combustion chamber can be shortened. Therefore, since the axial length of the combustion chamber can be shortened, downsizing and cost reduction of the combustor can be achieved.

  Further, in the combustor according to the present invention, the oxidant gas chamber partition wall may be formed in a tapered shape expanding in diameter from one axial direction side of the combustion chamber to the other side.

  According to this combustor, since the oxidant gas chamber partition wall is formed in a tapered shape that increases in diameter from one axial direction side to the other side of the combustion chamber, the jet flow of the fuel gas ejected from the fuel gas nozzle Can be diffused in the radial direction of the combustion chamber along the surface of the oxidant gas chamber partition wall. Thereby, the flame length in the axial direction of the combustion chamber can be shortened.

  Further, in the combustor according to the present invention, the oxidant gas chamber partition wall extends from the fuel gas chamber partition wall radially outward of the combustion chamber, and from the outer peripheral portion of the inner sidewall portion. It may have an outer wall extending toward the other axial side of the combustion chamber.

  According to this combustor, the oxidant gas chamber partition wall extends from the fuel gas chamber partition wall radially outward of the combustion chamber, and from the outer peripheral portion of the inner sidewall portion to the other axial direction of the combustion chamber And an outer wall extending towards the end. Thus, for example, when the amount of combustion is small and the flow velocity of the jet of fuel gas is slow, the oxidant gas and the fuel gas ejected from the oxidant gas nozzle of the inner side wall portion may not be sufficiently mixed. The mixing of the fuel gas and the oxidizing gas is promoted by the oxidizing gas jetted from the oxidizing gas nozzle of the wall portion, so that a mixed gas is generated, and the flame is not blown out, and stable short flame combustion can be obtained.

  Further, in the combustor of the present invention, the oxidant gas chamber partition wall may extend along the radial direction of the combustion chamber.

  According to this combustor, since the oxidant gas chamber partition extends along the radial direction of the combustion chamber, the axial dimension of the oxidant gas chamber partition can be reduced, and thus the combustor can It can be miniaturized in the direction.

  In the combustor according to the present invention, the plurality of oxidant gas nozzles may be an oxidant gas nozzle row in which a plurality of the oxidant gas nozzles are arranged in the radial direction of the oxidant gas chamber partition wall. A plurality of these are formed in the direction, and in each of the oxidant gas nozzle rows, the oxidant gas chamber partition wall is provided radially outward of the spacing between the plurality of oxidant gas nozzles located radially inward of the oxidant gas chamber partition wall. The spacing between the plurality of positioned oxidant gas nozzles may be narrower.

  According to this combustor, in each oxidant gas nozzle row, a plurality of the oxidant gas chamber partitions that are located radially outside of the plurality of oxidant gas nozzles located radially inward of the oxidant gas chamber partition wall The distance between the oxidizer gas nozzles in this case is narrower. Therefore, negative pressure can be applied to the radially outer side of the combustion chamber, so that the fuel gas, the flame, and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber. Thereby, for example, when a flow passage is provided around the combustor, the heat of the combustion exhaust gas can be efficiently transferred to the gas flowing in the flow passage.

  Further, in the combustor of the present invention, the oxidant gas nozzle may be opened toward the radially outer side and the other axial side of the combustion chamber.

  According to this combustor, since the oxidant gas nozzle is opened radially outward and axially to the other side of the combustion chamber, the flame and combustion are caused by the jet of the oxidant gas ejected from the oxidant gas nozzle. The exhaust gas can easily flow to the outer peripheral side of the combustion chamber. Thereby, for example, when a flow passage is provided around the combustor, the heat of the combustion exhaust gas can be efficiently transferred to the gas flowing in the flow passage.

  Further, in order to achieve the above object, the fuel cell module of the present invention comprises a solid oxide fuel cell stack which generates electricity by an electrochemical reaction between a fuel gas and an oxidant gas, and a raw fuel after the raw fuel is vaporized. A fuel gas as a fuel electrode exhaust gas discharged from a fuel electrode of the fuel cell stack, a gasifying unit generating the gas, a reforming unit generating the fuel gas from the raw fuel gas, and the fuel cell The combustor according to any one of claims 1 to 12, wherein the stack exhaust gas mixed with an oxidant gas, which is an exhaust gas from an air electrode of the cell stack, is burned.

  According to this fuel cell module, since the above-described combustor is applied, the stack exhaust gas can be used even when the properties, the composition, and the like of the stack exhaust gas, which is a mixed gas of the fuel gas and the oxidant gas, differ at startup or power generation. It can be made to burn stably by a single burner. As a result, the structure of the combustor and the periphery thereof can be simplified, so that the fuel cell module can be miniaturized and the cost can be reduced.

  In the fuel cell module of the present invention, the combustor is provided above the fuel cell stack, and the reforming unit is disposed coaxially with the combustor above the combustor, and Combustion exhaust gas formed by at least a triple cylindrical wall having a gap between the inner and outer cylindrical walls of the triple cylindrical wall, the adiabatic space, the combustion exhaust gas discharged from the combustor flowing between A flow path and a reforming flow path in which the raw fuel gas is reformed using the heat of the combustion exhaust gas to generate the fuel gas, and the vaporization section is located above the reforming section And at least a triple cylindrical or elliptical cylindrical wall provided coaxially with the reforming section and having a gap between each other, and the inner and the cylindrical in the triple cylindrical wall Insulated space between the walls Flue gas passage of the combustion exhaust gas flows, and the vaporization flow path wherein raw fuel the raw fuel gas is vaporized is generated by heat exchange with the flue gases of which may have, respectively.

  According to this fuel cell module, the vaporization unit and the reforming unit are each formed by at least three cylindrical walls, so that the structures of the vaporization unit and the reforming unit can be simplified, and the vaporization unit and the reforming unit can be simplified. The reforming unit can be miniaturized. In addition, since the combustor, the reforming unit, and the vaporization unit are coaxially disposed, the fuel cell module can be miniaturized in the radial direction.

  As described above, according to the combustor of the present invention, the mixed gas can be stably burned even when the properties, the composition, and the like of the mixed gas in which the fuel gas and the oxidant gas are mixed are different. , Miniaturization and cost reduction can be realized.

  Further, according to the fuel cell module of the present invention, the structure of the combustor and the periphery thereof can be simplified, and miniaturization and cost reduction can be realized.

It is a longitudinal cross-sectional view of a fuel cell module. It is a principal part enlarged view of a fuel cell module. It is a principal part enlarged view of a fuel cell module. It is a principal part enlarged view of a fuel cell module. It is a perspective view including a longitudinal section of a burner concerning a first embodiment. It is a figure explaining a mode that fuel gas and oxidant gas are mixed in a burner concerning a first embodiment. It is a figure which shows the combustion state in case the flow volume of oxidant gas is excess with respect to the flow volume of fuel gas in the combustor which concerns on 1st embodiment. It is a figure which shows a combustion state in case the flow volume of fuel gas is large, and there are many combustion amounts in the combustor which concerns on 1st embodiment. It is a perspective view including a longitudinal section of a burner concerning a second embodiment. It is a perspective view including a longitudinal section of a burner concerning a third embodiment. It is a figure which shows the combustion state in case the flow volume of oxidant gas is excess with respect to the flow volume of fuel gas in the combustor which concerns on 3rd embodiment. It is a figure which shows a combustion state in case the flow volume of fuel gas is large, and there are many combustion amounts in the combustor which concerns on 3rd embodiment. It is a figure which shows the state which the recirculation | recirculation flow has produced in the jet stream of the oxidizing agent gas ejected from the oxidizing agent gas nozzle in the combustor which concerns on 3rd embodiment. It is a perspective view showing the flow of the jet stream of the burner concerning a third embodiment. It is a perspective view which shows the 1st modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 2nd modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 3rd modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 4th modification of the combustor which concerns on 3rd embodiment. It is a longitudinal cross-sectional view which shows the 5th modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 6th modification of the burner concerning a third embodiment. It is a perspective view which shows the 7th modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 8th modification of the combustor which concerns on 3rd embodiment. It is a perspective view which shows the 9th modification of the combustor which concerns on 3rd embodiment.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described.

<Fuel cell module>
As shown in FIG. 1, the fuel cell module M according to the first embodiment includes a fuel cell stack 10, a container 20, a heat insulating layer 130, and a heat insulating material 140.

<Fuel cell stack>
A solid oxide fuel cell (SOFC) is applied to the fuel cell stack 10 as an example. The fuel cell stack 10 includes a plurality of flat cells 12 stacked vertically and a manifold 14. The shape of the cell 12 may be any shape other than a flat plate, such as a cylindrical or cylindrical flat plate. Each cell 12 has a fuel electrode, an electrolyte layer, and an air electrode.

  A fuel gas (reformed gas) is supplied to the fuel electrode of each cell 12, and an oxidant gas is supplied to the air electrode of each cell 12. Each cell 12 generates electricity by the electrochemical reaction between the fuel gas and the oxidant gas, and generates heat as the electricity is generated.

<Container>
The container 20 is composed of a plurality of (nine) pipes 21-29. Each of the plurality of tubular members 21 to 29 is formed in a cylindrical shape whose cross section is a perfect circular shape, and is formed of a metal having high heat conductivity. The plurality of pipes 21 to 29 are arranged in order from the inside to the outside of the container 20.

  The first pipe member 21 from the inside of the container 20 is provided from above the fuel cell stack 10 to the upper end of the container 20. The second pipe 22 and the third pipe 23 are formed to have a length corresponding to the upper portion of the first pipe 21, and the second pipe 22 is an upper portion of the pipe 21 from the outside of the first pipe 21. Bonded to. The fourth pipe 24 is provided at the center in the height direction of the container 20, and the fifth pipe 25 and the sixth pipe 26 are provided from the lower end to the upper end of the container 20. . The seventh pipe material 27, the eighth pipe material 28, and the ninth pipe material 29 are provided from the central portion to the upper end portion in the height direction of the container 20.

  The sixth pipe member 26 and the seventh pipe member 27 are connected via the horizontally extending connecting portion 31. The fifth pipe member 25 and the eighth pipe member 28 are connected via the horizontally extending connecting portion 32. Are connected. The upper end portion of the ninth pipe member 29 is fixed to the upper end portion of the third pipe member 23 through a connecting portion 33 extending in the horizontal direction.

  The lower end of the fifth pipe 25 is fixed to the bottom wall 34, and the lower end of the sixth pipe 26 is fixed to the bottom wall 35. The fuel cell stack 10 is mounted on the bottom wall 34, and the bottom wall 34 and the bottom wall 35 are fixed by the spacer 36.

  The container 20 configured by the plurality of pipe members 21 to 29 has a vaporization unit 40, a reforming unit 60, a combustion unit 90, a preheating unit 100, and a heat exchange unit 110, for each function.

<Vavaporation part>
The vaporization part 40 is comprised by the four-fold cylindrical wall 41-44, as FIG. 2, FIG. 3 shows. The cylindrical wall 41 located at the innermost side among the four-fold cylindrical walls 41 to 44 is constituted by the upper portion of the first pipe member 21 and the second pipe member 22 and is a four-fold cylindrical wall 41 to 44 The second cylindrical wall 42 from the inner side is constituted by the third pipe member 23. Moreover, the third cylindrical wall 43 from the inner side among the quadruple cylindrical walls 41 to 44 is constituted by the upper portion of the fifth pipe member 25, and the outermost cylinder among the quadruple cylindrical walls 41 to 44. The wall 44 is constituted by the top of the sixth tube 26.

  The vaporizing unit 40 constituted by the four-fold cylindrical walls 41 to 44 is provided coaxially with the reforming unit 60 above the reforming unit 60 described later. The quadruple cylindrical walls 41 to 44 constituting the vaporizing unit 40 have a gap between each other, and the heat insulating space 45 is formed on the inside to the outside of the quadruple cylindrical walls 41 to 44. A vaporization passage 46, a combustion exhaust gas passage 47, and an oxidant gas passage 48 are formed in order.

  That is, the space inside the first cylindrical wall 41 is formed as the heat insulation space 45, and the gap between the first cylindrical wall 41 and the second cylindrical wall 42 is used as the vaporization channel 46. It is formed. Further, a gap between the second cylindrical wall 42 and the third cylindrical wall 43 is formed as the combustion exhaust gas flow path 47, and the third cylindrical wall 43 and the fourth cylindrical wall 44 are formed. A gap between the two is formed as an oxidant gas channel 48. In FIG. 2, the heat insulation space 45 is hollow, but the heat insulation space 45 may be filled with a heat insulation material 49.

  A raw fuel supply pipe 50 extending to the outside in the radial direction of the container 20 is connected to an upper end portion of the vaporization flow path 46. The raw fuel supply pipe 50 is located above the connection portions 31 to 33. The vaporization flow path 46 is formed with the upper side in the vertical direction as the upstream side, and the raw fuel 161 supplied from the raw fuel supply pipe 50 flows downward from the upper side in the vertical direction to the vaporization flow path 46. As the raw fuel 161 supplied from the raw fuel supply pipe 50, a mixture of hydrocarbon fuel and water for reforming is used. In addition, as a hydrocarbon fuel contained in the raw fuel 161, for example, a city gas is suitably used, but a gas containing a hydrocarbon such as propane as a main component may be used, and a hydrocarbon-based liquid May be used.

  The vaporization passage 46 is provided with a spiral member 51 formed in a spiral shape around the axial direction of the vaporization unit 40, and the vaporization passage 46 is formed around the axial direction of the vaporization unit 40 by the spiral member 51. Are spirally formed.

  The lower end portion of the combustion exhaust gas passage 47 is in communication with a combustion chamber 207 (see FIGS. 4 and 5) formed in the combustor 200 via a combustion exhaust gas passage 67 formed in the reforming unit 60 described later. There is. The combustion exhaust gas passage 47 is formed such that the lower side in the vertical direction is the upstream side, and the combustion exhaust gas passage 47 is discharged from the combustor 200 and supplied through the combustion exhaust gas passage 67 of the reforming unit 60. The flue gas 168 flows vertically from the lower side to the upper side.

  At the upper end portion of the combustion exhaust gas passage 47, a straightening vane 52 formed annularly along the circumferential direction of the combustion exhaust gas passage 47 is provided. A plurality of orifices 53 are formed in the straightening vane 52 at intervals in the circumferential direction. The plurality of orifices 53 penetrate in the plate thickness direction of the flow straightening plate 52. Note that the current plate 52 may be omitted.

  An upper end portion of the oxidant gas flow channel 48 is in communication with an oxidant gas flow channel 118 formed in a heat exchange unit 110 described later. The oxidant gas channel 48 is formed such that the upper side in the vertical direction is the upstream side, and the oxidant gas 164 supplied from the oxidant gas channel 118 of the heat exchange unit 110 to the oxidant gas channel 48. Flows from the upper side to the lower side in the vertical direction.

<Reforming section>
As shown in FIG. 3, the reforming unit 60 is configured by quadruple cylindrical walls 61 to 64. The innermost cylindrical wall 61 of the quadruple cylindrical walls 61 to 64 is formed by the lower part of the first tube 21 and the second cylinder from the inside of the quadruple cylindrical walls 61 to 64 The wall 62 is constituted by the fourth pipe 24. Further, the third cylindrical wall 63 from the inner side among the four-fold cylindrical walls 61 to 64 is constituted by the central portion in the height direction of the fifth pipe member 25, and the fourth cylindrical wall 61 to 64 The outermost cylindrical wall 64 is constituted by the central portion in the height direction of the sixth pipe member 26.

  The reforming unit 60 configured by the four-fold cylindrical walls 61 to 64 is provided coaxially with the combustor 200 above the combustor 200 (see FIG. 4) described later. The quadruple cylindrical walls 61 to 64 constituting the reforming unit 60 have a gap between each other. And the heat insulation space 65, the combustion exhaust gas flow path 67, the reforming flow path 66, and the oxidant gas flow path 68 are formed in order from the inside to the outside of the quadruple cylindrical walls 61 to 64.

  That is, the space inside the first cylindrical wall 61 is formed as the heat insulation space 65, and the space between the first cylindrical wall 61 and the second cylindrical wall 62 is the combustion exhaust gas flow path 67. It is formed as. Further, a gap between the second cylindrical wall 62 and the third cylindrical wall 63 is formed as a reforming channel 66, and the third cylindrical wall 63 and the fourth cylindrical wall 64 are formed. A gap between the two is formed as an oxidant gas channel 68.

  The heat insulation space 65 is in communication with the heat insulation space 45 of the vaporization section 40 described above. Although the heat insulation space 65 is hollow in FIG. 3, the heat insulation space 65 may be filled with a heat insulation material 69. The lower end portion of the combustion exhaust gas passage 67 is in communication with a combustion chamber 207 (see FIGS. 4 and 5) formed in a combustor 200 described later. The combustion exhaust gas flow path 67 is formed with the vertical direction lower side as the upstream side, and in the combustion exhaust gas flow path 67, the combustion exhaust gas 168 discharged from the combustor 200 described later flows upward from the vertical direction .

<Mixing part and dispersing part>
At an upper end portion of the reforming unit 60, a mixing unit 80 extended upward in the vertical direction is formed. The mixing unit 80 is located between the vaporization unit 40 and the reforming unit 60, that is, more specifically, on the upper side of the reforming unit 60 and radially outside the lower end of the vaporization unit 40. A connecting pipe 81 extends radially outward from a part of the lower end portion of the vaporization section 40 in the circumferential direction. The connecting pipe 81 constitutes a connecting portion with the vaporizing unit 40 in the mixing section 80, and the inside of the connecting pipe 81 is formed as an orifice 82 penetrating in the horizontal direction. The connection pipe 81 (orifice 82) is located radially outside of the vaporization flow channel 46 and communicates with the lower end of the vaporization flow channel 46. The mixing unit 80 has only one connecting pipe 81 (orifice 82). The mixing section 80 is provided with an opposing wall 86 located on the reforming flow channel 66 side (radial direction outer side) with respect to the orifice 82 and facing the orifice 82.

  The inlet (upper end) of the reforming flow passage 66 is in communication with the vaporization flow passage 46 via the mixing unit 80 and the connection pipe 81. The reforming flow path 66 is formed with the upper side in the vertical direction as the upstream side, and the raw fuel gas 162 supplied from the vaporization flow path 46 flows downward from the upper side in the vertical direction to the reforming flow path 66.

  At the inlet of the reforming flow passage 66, a partition plate 83 formed annularly along the circumferential direction of the reforming flow passage 66 is provided. In the partition plate 83, a plurality of orifices 84 are formed at regular intervals in the circumferential direction. The plurality of orifices 84 penetrate in the plate thickness direction (vertical direction) of the partition plate 83, and the raw fuel gas 162 flows into the reforming flow path 66 through the plurality of orifices 84. A plurality of partition plates 83 may be provided at intervals in the vertical direction.

  The reforming catalyst layer 70 for generating the fuel gas 163 from the raw fuel gas 162 is provided in the reforming passage 66 along the entire length in the circumferential direction and the axial direction of the reforming passage 66. For the reforming catalyst layer 70, for example, a particulate catalyst or a honeycomb catalyst supporting a metal such as nickel, ruthenium, platinum or rhodium as an active metal is used.

  The upper end portion of the oxidant gas flow passage 68 is in communication with the oxidant gas flow passage 48 formed in the above-described vaporization unit 40. The oxidant gas channel 68 is formed such that the upper side in the vertical direction is the upstream side, and the oxidant gas 164 supplied from the oxidant gas channel 48 of the vaporization unit 40 is supplied to the oxidant gas channel 68. It flows from the upper side to the lower side in the vertical direction.

<Combustion part>
As shown in FIG. 4, the combustion unit 90 is provided coaxially with the reforming unit 60 below the above-described reforming unit 60. The combustor 200 shown in FIG. 5 is applied to the inside of the combustion unit 90. The combustor 200 includes a combustion chamber peripheral wall 201, a combustion chamber inner wall 202, a flow straightening unit 203, a fuel gas chamber partition wall 204, and an oxidant gas chamber partition wall 205.

  The combustion chamber peripheral wall 201 is formed by extending downward the second cylindrical wall 62 from the inner side among the quadruple cylindrical walls 61 to 64 constituting the above-described reforming unit 60 (see FIG. 4). ). In the combustor 200 shown in FIG. 5, the stepped portion 201A is formed in the combustion chamber peripheral wall 201, but the fuel cell module M in FIG. 1 is shown with the stepped portion 201A omitted. The combustion chamber peripheral wall 201 is formed in a tubular shape, and a combustion chamber 207 is formed inside the combustion chamber peripheral wall 201. The combustion chamber 207 is formed with the vertical direction as an axial direction. In the combustion chamber 207, a mixed gas in which a fuel gas jetted from a fuel gas nozzle 210 described later and an oxidant gas jetted from the oxidant gas nozzle 211 are mixed is burned.

  The combustion chamber inner wall 202 is smaller in diameter than the combustion chamber peripheral wall 201, and is provided inside the combustion chamber peripheral wall 201. The combustion chamber inner wall 202 is formed by the lower end portion of the innermost cylindrical wall 61 among the quadruple cylindrical walls 61 to 64 constituting the above-described reforming unit 60 (see FIG. 4). As shown in FIG. 5, the combustion chamber wall 202 is disposed on the upper side of the combustion chamber 207. A gap between the combustion chamber peripheral wall 201 and the combustion chamber inner wall 202 is formed as an inlet portion 67A of the combustion exhaust gas flow path 67 formed in the above-described reforming unit 60. The combustion exhaust gas generated in the combustion chamber 207 flows into the combustion exhaust gas channel 67 from the inlet portion 67 A of the combustion exhaust gas channel 67.

  At the lower end portion of the combustion chamber inner wall 202, a flow straightening unit 203 extending downward of the combustion chamber 207 is formed. The straightening unit 203 is formed in a conical shape that increases in diameter toward the upper side (downstream side) of the combustion chamber 207. The inner side of the flow straightening portion 203 and the inner side of the combustion chamber wall 202 are, for example, hollow. Note that a heat insulating material may be filled inside the flow straightening unit 203.

  The combustion chamber inner wall 202 and the straightening unit 203 are formed on the innermost pipe 21 (see also FIG. 1) of the plurality of pipes 21 to 29 constituting the container 20 described above. A pipe 150 is provided at an axial core portion of the pipe member 21. The pipe 150 is fixed to the pipe member 21. Inside the pipe 150, the spark plug 151 is inserted. As shown in FIG. 1, the upper end portion of the pipe 150 is led upward from the end (upper end portion) of the pipe 21 opposite to the straightening portion 203 side, and the spark plug 151 is on the upper end side of the pipe 150. The inside of the pipe 150 is insertably inserted and removed through the opening.

  The spark plug 151 has a conductive core 152 and an insulating material 153 covering the core 152. The tip (lower end) of the core 152 is formed as an ignition electrode 154, and the portion above the tip of the core 152 is formed as a conductive portion 155. The lower end portions of the pipe 150 and the insulating material 153 are protruded from the tip end portion of the straightening unit 203. Further, the ignition electrode 154 protrudes from lower ends of the pipe 150 and the insulating material 153 and is disposed on the central axis of the combustion chamber 207. The ignition electrode 154 also serves as a flame rod for flame current detection. As a technique in which the ignition electrode doubles as a flame rod for flame current detection, for example, the technique described in Japanese Patent Publication No. 7-117241 is applied.

  In addition to the combustion chamber 207, a fuel gas chamber 208 and an oxidant gas chamber 209 are formed inside the combustion chamber peripheral wall 201. The fuel gas chamber 208 is provided on the lower side of the combustion chamber 207 adjacent to the combustion chamber 207. The fuel electrode chamber exhaust gas from the fuel electrode of the fuel cell stack 10 (see FIG. 4) is supplied to the fuel gas chamber 208 as a fuel gas. The oxidant gas chamber 209 is provided around the fuel gas chamber 208. The exhaust gas from the air electrode discharged from the air electrode of the fuel cell stack 10 (see FIG. 4) is supplied to the oxidant gas chamber 209 as an oxidant gas.

  The fuel gas chamber partition wall 204 is formed in a cylindrical shape, and is provided inside the combustion chamber peripheral wall 201 coaxially with the combustion chamber peripheral wall 201. The fuel gas chamber partition wall 204 divides the fuel gas chamber 208 and the oxidant gas chamber 209. An opening on the side of the combustion chamber 207 in the cylindrical fuel gas chamber partition wall 204 is formed as a fuel gas nozzle 210.

  As shown in FIG. 6, from the fuel gas nozzle 210, the fuel gas 165 supplied to the fuel gas chamber 208 is ejected. The fuel gas 165 ejected from the fuel gas nozzle 210 is diffused from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 over the entire circumference of the oxidant gas chamber partition wall 205. In this combustor 200, the fuel gas 165 ejected from the fuel gas nozzle 210 is diffused from the inside to the outside in the radial direction of the oxidant gas chamber partition wall 205 along the entire circumference of the oxidant gas chamber partition wall 205. The hole diameter of the fuel gas nozzle 210 and the shape of the fuel gas chamber partition wall 204 are set according to the flow rate and flow velocity of the fuel gas which is the fuel electrode exhaust gas discharged from the fuel electrode of the fuel cell stack 10.

  As shown in FIG. 5, the oxidant gas chamber partition wall 205 is annularly provided around the fuel gas chamber partition wall 204 and partitions the combustion chamber 207 and the oxidant gas chamber 209. The oxidant gas chamber partition wall 205 is formed in a tapered shape that increases in diameter from the lower side to the upper side of the combustion chamber 207.

  A plurality of oxidant gas nozzles 211 are formed on the oxidant gas chamber partition wall 205. The plurality of oxidant gas nozzles 211 are formed by holes penetrating in the thickness direction of the oxidant gas chamber partition wall 205. The plurality of oxidant gas nozzles 211 are arranged radially around the central axis of the combustion chamber 207. That is, the plurality of oxidant gas nozzles 211 are spaced apart in the circumferential direction of the oxidant gas chamber partition wall 205 by arranging the oxidant gas nozzle row 212 in which the plurality of oxidant gas nozzles 211 are arranged in the radial direction of the oxidant gas chamber partition wall 205 It is formed in plural.

  In each oxidant gas nozzle row 212, a plurality of oxidants located radially outside of the oxidant gas chamber partition wall 205 with respect to the distance between the plurality of oxidant gas nozzles 211 located radially inward of the oxidant gas chamber partition wall 205 The distance between the gas nozzles 211 is narrower.

  As shown in FIG. 6, the oxidizing gas 166 supplied to the oxidizing gas chamber 209 is ejected from the oxidizing gas nozzle 211. The oxidant gas 166 ejected from the oxidant gas nozzle 211 is mixed with the fuel gas 165 which is ejected from the above-described fuel gas nozzle 210 and diffuses from the radially inner side to the outer side of the oxidant gas chamber partition wall 205.

  As shown in FIG. 4, a reforming flow passage 66 and an oxidant gas flow passage 68 of the reforming unit 60 are formed around the above-described combustor 200. That is, the third and fourth cylindrical walls 63 and 64 from the inner side of the quadruple cylindrical walls 61 to 64 are extended downward. Further, the reforming flow path 66 of the reforming unit 60 is formed to be extended between the cylindrical wall 62 and the cylindrical wall 63, and between the cylindrical wall 63 and the cylindrical wall 64. The oxidant gas flow path 68 of the reforming unit 60 is formed to be extended.

  In addition, a fuel gas chamber bottom wall 213 is provided at the bottom of the fuel gas chamber 208, and at the central portion of the fuel gas chamber bottom wall 213, a cylindrical shape projecting to the fuel cell stack 10 side (lower side) is provided. A connecting wall 214 is formed. Fuel gas 165, which is an anode exhaust gas discharged from the fuel electrode of the fuel cell stack 10, flows into the fuel gas chamber 208 through a communication passage 215 formed inside the connection wall 214.

  Further, an oxidant gas chamber peripheral wall 216 is provided on the outer peripheral portion of the oxidant gas chamber 209, and an oxidant gas chamber bottom wall 217 is provided on the bottom of the oxidant gas chamber 209. A communicating hole 218 is formed in the oxidant gas chamber bottom wall 217, and an oxidant gas 166, which is an exhaust gas from the air electrode discharged from the air electrode of the fuel cell stack 10, passes through the communicating hole 218 to form an oxidant gas chamber. Flow into 209.

  In the first embodiment, the lower side of the combustion chamber 207 corresponds to “one side in the axial direction of the combustion chamber” in the present invention, and the upper side of the combustion chamber 207 corresponds to the “other side in the axial direction of the combustion chamber”. Equivalent to

<Preheating part>
As shown in FIG. 4, the preheating unit 100 (housing unit) is configured by double cylindrical walls 101 and 102 provided below the combustion unit 90. The inner cylindrical wall 101 of the double cylindrical walls 101 and 102 is formed by the lower portion of the fifth pipe member 25, and the outer cylindrical wall 102 of the double cylindrical walls 101 and 102 is six. The lower part of the second pipe 26 is constituted.

  The preheating unit 100 is provided around the fuel cell stack 10 and accommodates the fuel cell stack 10. An inner space 104 is formed inside the preheating unit 100, and a preheating flow passage 105 is formed between the double cylindrical walls 101 and 102 constituting the preheating unit 100.

  The preheating flow passage 105 is provided with a spiral member 106 formed in a spiral shape around the axial direction of the preheating unit 100, and the preheating flow passage 105 is provided around the axial direction of the preheating portion 100 by the spiral member 106. Are spirally formed.

  The upper end portion of the preheating flow channel 105 is in communication with the oxidant gas flow channel 68 of the above-mentioned reforming unit 60, and the lower end portion of the preheating flow channel 105 is a bottom wall 34 and a bottom wall 35 shown in FIG. And an oxidant gas inlet 15 of the fuel cell stack 10 through an introduction passage 37 formed therebetween. As shown in FIG. 4, the preheating channel 105 is formed such that the upper side in the vertical direction is the upstream side, and the oxidation gas supplied to the preheating channel 105 through the oxidant gas channel 68 of the reforming unit 60 is The agent gas 164 flows from the upper side to the lower side in the vertical direction.

  Further, inside the preheating unit 100, a fuel gas pipe 107 connecting the above-described reforming flow passage 66 and the fuel gas inlet 16 (see FIG. 1) of the fuel cell stack 10 is provided. The reforming flow passage 66 and the inside of the fuel gas pipe 107 are in communication via an orifice 98 provided at the lower end of the reforming flow passage 66.

<Heat exchange section>
As shown in FIG. 2, the heat exchange unit 110 is configured by triple cylindrical walls 111 to 113 provided around the above-described reforming unit 60 and the vaporization unit 40. The inner cylindrical wall 111 in the triple cylindrical walls 111 to 113 is constituted by the seventh pipe member 27 and the central cylindrical wall 112 in the triple cylindrical walls 111 to 113 is constituted by the eighth pipe member 28 The outer tubular wall 113 of the triple tubular walls 111 to 113 is constituted by the ninth tube member 29.

  The triple cylindrical walls 111 to 113 constituting the heat exchange portion 110 have a gap between each other. Then, an oxidizing gas channel 118 is formed between the inner cylindrical wall 111 and the central cylindrical wall 112, and between the outer cylindrical wall 113 and the central cylindrical wall 112, A flue gas passage 117 is formed.

  The oxidant gas flow passage 118 is provided with a spiral member 121 formed in a spiral shape around the axial direction of the heat exchange portion 110, and the oxidant gas flow passage 118 is formed by the heat exchange portion by the spiral member 121. It is spirally formed around the axial direction of 110. Similarly, the combustion exhaust gas flow passage 117 is provided with a spiral member 120 formed in a spiral shape around the axial direction of the heat exchange unit 110, and the combustion exhaust gas flow passage 117 is subjected to heat exchange by the spiral member 120. It is spirally formed around the axial direction of the portion 110.

  An oxidant gas supply pipe 122 (see FIG. 1) extending to the outside in the radial direction of the container 20 is connected to the lower end portion of the oxidant gas flow path 118. A gap between the connecting portion 31 and the connecting portion 32 is formed as a connecting flow passage 38 extending in the radial direction of the container 20, and the upper end portion of the oxidant gas flow passage 118 is described above via the connecting flow passage 38. It is in communication with the oxidant gas flow path 48 formed in the vaporization section 40 of the The oxidant gas flow passage 118 is formed such that the lower side in the vertical direction is the upstream side, and an oxidant gas 164 supplied from the oxidant gas supply pipe 122 (see FIG. 1) is supplied to the oxidant gas flow passage 118. Flows upward from the bottom in the vertical direction.

  Further, a gap between the connecting portion 32 and the connecting portion 33 is formed as a connecting flow passage 39 extending in the radial direction of the container 20, and the upper end portion of the combustion exhaust gas flow passage 117 is via the connecting flow passage 39. It is in communication with the flue gas passage 47 formed in the above-mentioned vaporization unit 40. A gas exhaust pipe 123 (see FIG. 1) extending to the outside in the radial direction of the container 20 is connected to the lower end portion of the combustion exhaust gas flow path 117. The flue gas passage 117 is formed such that the upper side in the vertical direction is the upstream side, and the flue gas 168 supplied from the flue gas passage 47 of the vaporization section 40 is lower in the flue gas passage 117 from the upper side in the vertical direction. Flow to the side.

<Adiabatic layer>
As shown in FIG. 1, the reforming unit 60, the vaporization unit 40, and the heat exchange unit 110 are separated in the radial direction of the container 20, and the reforming unit 60, the vaporization unit 40, and the heat exchange unit 110 are separated. And a cylindrical heat insulating layer 130 is interposed therebetween. The heat insulating layer 130 covers the vaporizing unit 40 and the reforming unit 60 from the outside.

<Heat insulation material>
The heat insulating material 140 has a cylindrical main body portion 141 and a disk-like upper portion 142 and a lower portion 143, and covers the container 20. That is, the main body portion 141 is provided around the container 20 and covers the container 20 from the outside. The upper portion 142 is provided around the upper portion of the container 20 while covering the main body portion 141 from the upper side in the vertical direction. The upper portion 142 is fixed by the fixing member 144 from the upper side in the vertical direction. The lower portion 143 covers the container 20 and the main body portion 141 from the lower side in the vertical direction. The surface of the heat insulating material 140 is covered by a covering sheet 145.

<Operation of Fuel Cell Module>
Next, the operation of the fuel cell module M according to the first embodiment will be described.

  When the raw fuel 161 (the mixture of the raw fuel and the reforming water) is supplied to the vaporization passage 46 shown in FIG. 2 through the raw fuel supply pipe 50 shown in FIG. 1, the raw fuel 161 has a spiral shape. The gas flows from the upper side to the lower side in the vertical direction through the vaporization flow path 46 formed in the shape of a circle. At this time, in the vaporization unit 40, the combustion exhaust gas 168 discharged from the combustor 200 (see FIG. 4) flows in the combustion exhaust gas passage 47 from the lower side to the upper side in the vertical direction. When the combustion exhaust gas 168 flows through the combustion exhaust gas flow passage 47 adjacent to the vaporization flow passage 46, heat is exchanged between the raw fuel 161 and the combustion exhaust gas 168 flowing through the vaporization flow passage 46. Then, in the vaporization flow channel 46, the raw fuel 161 is vaporized, and the raw fuel gas 162 shown in FIG. 3 is generated.

  The raw fuel gas 162 vaporized in the vaporization channel 46 flows through the orifice 82 formed inside the connecting pipe 81 and flows into the inner space 85 of the mixing unit 80 formed above the reforming unit 60. At this time, when the raw fuel gas 162 vaporized in the vaporization channel 46 passes through the orifice 82 inside the connecting pipe 81, the flow velocity is increased to form a jet, and the radially outer opposing wall portion 86 in the mixing section 80 To clash. Then, the raw fuel gas 162 collides with the facing wall portion 86 to generate a turbulent flow, and the hydrocarbon-based gas and the water vapor contained in the raw fuel gas 162 are mixed.

  The raw fuel gas 162 mixed in this manner changes its direction from the radially outer side to the vertically lower side by colliding with the opposing wall portion 86, and a plurality of orifices 84 formed at the inlet of the reforming flow path 66. Flows into the reforming channel 66 through the Since the plurality of orifices 84 are arranged at regular intervals in the circumferential direction of the reforming flow passage 66, the raw fuel gas 162 is contained in the reforming flow passage 66 by passing through the plurality of orifices 84. It disperses and flows in the circumferential direction.

  At this time, in the reforming unit 60, the combustion exhaust gas 168 discharged from the combustor 200 (see FIG. 4) flows in the combustion exhaust gas passage 67 from the lower side to the upper side in the vertical direction. When the combustion exhaust gas 168 flows into the combustion exhaust gas flow passage 67 adjacent to the reforming flow passage 66, heat exchange is performed between the raw fuel gas 162 flowing through the reforming flow passage 66 and the combustion exhaust gas 168. Then, in the reforming flow passage 66, the fuel gas 163 is generated from the raw fuel gas 162 by the reforming catalyst layer 70 using the heat of the combustion exhaust gas 168.

  The fuel gas 163 generated in the reforming passage 66 passes through the orifice 98 and flows into the fuel gas pipe 107 as shown in FIG. Then, the fuel gas 163 is supplied to the fuel gas inlet 16 (see FIG. 1) of the fuel cell stack 10 through the fuel gas pipe 107.

  On the other hand, at this time, in the heat exchange unit 110 shown in FIG. 2, the oxidant gas 164 is supplied to the oxidant gas flow path 118 through the oxidant gas supply pipe 122 (see FIG. 1). The oxidant gas 164 flows from the lower side to the upper side in the spiral direction in the oxidant gas flow path 118. At this time, in the heat exchange unit 110, the combustion exhaust gas 168 discharged from the combustor 200 (see FIG. 4) flows from the upper side to the lower side in the vertical direction of the combustion exhaust gas passage 117. The flue gas 168 is discharged to the outside of the fuel cell module M through the gas discharge pipe 123 shown in FIG.

  As shown in FIG. 2, when the flue gas 168 flows in the flue gas passage 117 adjacent to the oxidant gas passage 118, between the oxidant gas 164 flowing in the oxidant gas passage 118 and the flue gas 168. Heat is exchanged. Then, the temperature of the combustion exhaust gas 168 discharged to the outside of the fuel cell module M is reduced, and the heat radiation to the outside of the fuel cell module M is suppressed. On the other hand, the oxidant gas 164 absorbs the heat of the flue gas 168 and is preheated. The oxidant gas 164 preheated by the heat exchange unit 110 flows into the oxidant gas passage 48 of the vaporization unit 40 through the connection passage 38, and thereafter, the oxidant gas passage 48 and the reforming of the vaporization unit 40 are reformed. The oxidant gas flow path 68 (see FIGS. 3 and 4) of the portion 60 flows from the upper side to the lower side in the vertical direction.

  In the vaporization unit 40 shown in FIG. 2, as described above, the combustion exhaust gas 168 discharged from the combustor 200 (see FIG. 4) flows in the combustion exhaust gas passage 47 from the lower side to the upper side in the vertical direction. When the flue gas 168 flows into the flue gas passage 47 adjacent to the oxidant gas passage 48, heat is exchanged between the oxidant gas 164 flowing through the oxidant gas passage 48 and the flue gas 168, and the oxidant gas 164 Is further preheated.

  Similarly, as shown in FIG. 3, in the reforming unit 60, the combustion exhaust gas 168 discharged from the combustor 200 (see FIG. 4) flows in the combustion exhaust gas flow path 67 from the lower side to the upper side in the vertical direction. When the combustion exhaust gas 168 flows through the exhaust gas flow channel 67 opposite to the oxidant gas flow channel 68 across the reforming flow channel 66, the oxidant gas 164 and the combustion exhaust gas 168 flowing through the oxidant gas flow channel 68 are reformed. Heat is exchanged through the quality flow path 66 (reforming catalyst layer 70), which also preheats the oxidant gas 164.

  Thus, the oxidant gas 164 preheated by flowing through the oxidant gas channel 68 flows into the preheating channel 105 shown in FIG. 4, and the spirally formed preheating channel 105 is vertically upward It flows from the bottom to the bottom. The oxidant gas 164 flowing through the preheating flow path 105 is further preheated by the heat of the fuel cell stack 10. Then, the oxidant gas 164 preheated by the preheating flow path 105 is supplied to the oxidant gas inlet 15 (see FIG. 1) of the fuel cell stack 10.

  As described above, the fuel gas (reformed gas) is supplied to the fuel gas inlet 16 of the fuel cell stack 10 shown in FIG. 1, and the oxidant gas inlet 15 of the fuel cell stack 10 is oxidized. When the agent gas is supplied, in the fuel cell stack 10, power is generated in each cell 12 by an electrochemical reaction between the fuel gas and the oxidant gas. In addition, each cell 12 generates heat as power is generated.

  Thus, when the fuel cell stack 10 is activated, the fuel electrode exhaust gas is discharged from the fuel electrode of the fuel cell stack 10, and the air electrode exhaust gas is discharged from the air electrode of the fuel cell stack 10. The fuel electrode exhaust gas contains a fuel gas that has not been used for power generation by the fuel cell stack 10, and similarly, the air electrode exhaust gas has an oxidant gas that has not been used for power generation with the fuel battery cell stack 10. Is included.

  As shown in FIG. 4, the fuel electrode exhaust gas discharged from the fuel electrode of the fuel cell stack 10 is supplied as a fuel gas to the fuel gas chamber 208 of the combustor 200 and discharged from the air electrode of the fuel cell stack 10 The thus-produced air electrode exhaust gas is supplied to the pair of oxidant gas chambers 209 of the combustor 200 as oxidant gas.

  Then, as shown in FIG. 6, from the fuel gas nozzle 210, a fuel gas 165, which is an anode exhaust gas supplied to the fuel gas chamber 208, is ejected. The fuel gas 165 ejected from the fuel gas nozzle 210 is diffused from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 over the entire circumference of the oxidant gas chamber partition wall 205.

  Further, from the plurality of oxidant gas nozzles 211, an oxidant gas 166, which is an air exhaust gas supplied to the oxidant gas chamber 209, is ejected. The oxidant gas 166 ejected from the plurality of oxidant gas nozzles 211 is mixed with the fuel gas 165 diffused from the inside to the outside in the radial direction of the oxidant gas chamber partition wall 205 over the entire circumference of the oxidant gas chamber partition wall 205 And a mixed gas is generated. The mixed gas mixed in the combustion chamber 207 is ignited and burned by a spark formed between the ignition electrode 154 and the pipe 150 or the like.

  Here, as shown in FIG. 7, for example, when the air ratio is high and the flow rate of the oxidant gas 166 is excessive to the flow rate of the fuel gas 165, the oxidant gas of the plurality of oxidant gas nozzles 211 is used. The oxygen necessary for the combustion of the mixed gas is sufficient with the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the chamber partition wall 205. In this case, the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the oxidant gas chamber partition wall 205 and the fuel gas 165 ejected from the fuel gas nozzle 210 are mixed. A mixed gas is produced. And, by burning the mixed gas, a flame 167 is generated on the inner side in the radial direction of the oxidant gas chamber partition wall 205.

  The jet stream of the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially outside the oxidant gas chamber partition wall 205 is mixed with the combustion exhaust gas 168 generated by the combustion of the mixed gas and discharged from the combustion chamber 207. Be done.

  On the other hand, as shown in FIG. 8, when the flow rate of the fuel gas 165 is large and the combustion amount is large, the oxidant gas nozzle positioned inward in the radial direction of the oxidant gas chamber partition wall 205 among the plurality of oxidant gas nozzles 211 The oxidant gas 166 ejected from the gas 211 runs short of oxygen necessary for the combustion of the mixed gas. In this case, the oxidant gas 166 jetted from the oxidant gas nozzle 211 provided from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 and the fuel gas 165 jetted from the fuel gas nozzle 210 are mixed. As a result, a mixed gas is generated. Then, the mixed gas is burned to generate a flame 167 from the inside to the outside in the radial direction of the oxidant gas chamber partition wall 205.

  As described above, in the combustor 200 according to the first embodiment, the mixing area and the flame area of the fuel gas 165 and the oxidant gas 166 maintain the optimum combustion even if the air ratio and the amount of combustion change. In order to change and respond, the flame does not blow out and stable short flame combustion can be obtained in a wide air ratio range from a normal air ratio (theoretical air ratio) to a high air ratio (for example, about λ = 5).

  Then, a combustion reaction occurs in the combustion chamber 207 in this manner, and the combustion exhaust gas 168 generated by the combustion reaction flows into the inlet portion 67A of the combustion exhaust gas flow path 67 along the rectifying portion 203 shown in FIG. . The combustion exhaust gas 168 flowing into the inlet portion 67A of the combustion exhaust gas flow passage 67 is, as described above, the combustion exhaust gas flow passage 67 of the reforming unit 60, the combustion exhaust gas flow passage 47 of the vaporization unit 40 (see FIG. 3) After flowing through the flue gas passage 117 (see FIG. 2) of the passage 39 and the heat exchange unit 110, the gas is discharged to the outside of the fuel cell module M through the gas discharge pipe 123 shown in FIG.

  Next, the operation and effects of the first embodiment of the present invention will be described.

  As described above in detail, according to the combustor 200 of the first embodiment, as shown in FIG. 6, the jet of the fuel gas 165 ejected from the fuel gas nozzle 210 is the entire of the oxidant gas chamber partition wall 205. The oxygen gas is diffused from the inside to the outside of the oxidant gas chamber partition wall 205 along the circumference. A plurality of oxidant gas nozzles 211 radially arranged around the central axis of the combustion chamber 207 are formed on the oxidant gas chamber partition wall 205 and diffused along the oxidant gas chamber partition wall 205. The jet of the fuel gas 165 is entrained in the jet of the oxidant gas 166 ejected from the plurality of oxidant gas nozzles 211, so that the fuel gas 165 and the oxidant gas 166 can be effectively mixed. As a result, even when the property, composition, and the like of the mixed gas in which the fuel gas 165 and the oxidant gas 166 are mixed are different, the mixed gas can be stably burned.

  Further, as shown in FIG. 7, for example, when the air ratio is high and the flow rate of the oxidant gas 166 is excessive to the flow rate of the fuel gas 165, the oxidant gas chamber of the plurality of oxidant gas nozzles 211 The oxygen necessary for the combustion of the mixed gas is sufficient with the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the partition wall 205. In this case, the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the oxidant gas chamber partition wall 205 and the fuel gas 165 ejected from the fuel gas nozzle 210 are mixed. A mixed gas is produced. And, by burning the mixed gas, a flame 167 is generated on the inner side in the radial direction of the oxidant gas chamber partition wall 205.

  The jet stream of the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially outside the oxidant gas chamber partition wall 205 is mixed with the combustion exhaust gas 168 generated by the combustion of the mixed gas and discharged from the combustion chamber 207. Be done.

  On the other hand, as shown in FIG. 8, when the flow rate of the fuel gas 165 is large and the combustion amount is large, the oxidant gas nozzle positioned inward in the radial direction of the oxidant gas chamber partition wall 205 among the plurality of oxidant gas nozzles 211 The oxidant gas 166 ejected from the gas 211 runs short of oxygen necessary for the combustion of the mixed gas. In this case, the oxidant gas 166 jetted from the oxidant gas nozzle 211 provided from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 and the fuel gas 165 jetted from the fuel gas nozzle 210 are mixed. As a result, a mixed gas is generated. Then, the mixed gas is burned to generate a flame 167 from the inside to the outside in the radial direction of the oxidant gas chamber partition wall 205.

  Thus, since the mixed region of the fuel gas 165 and the oxidant gas 166 is widely formed on the surface of the oxidant gas chamber partition wall 205 and the flame 167 is fixed on the surface of the oxidant gas 166 partition wall, the flame 167 It spreads in the radial direction of the combustion chamber 207, and the length of the flame 167 in the axial direction of the combustion chamber 207 can be shortened. Therefore, since the axial length of the combustion chamber 207 can be shortened, the combustor 200 can be miniaturized and the cost can be reduced.

  Furthermore, even if the air ratio and the amount of combustion change, the mixing area and the flame area of the fuel gas 165 and the oxidant gas 166 change to maintain optimum combustion, so that the normal air ratio (the theory In the wide air ratio range from the air ratio) to the high air ratio (for example, about λ = 5), the flame does not blow out and stable short flame combustion can be obtained.

  Further, according to the combustor 200 of the first embodiment, since the fuel gas nozzle 210 is formed by the opening on the side of the combustion chamber 207 in the cylindrical fuel gas chamber partition wall 204, the structure of the fuel gas nozzle 210 is simplified. And cost can be further reduced.

  Further, at the lower end portion of the combustion chamber inner wall 202, a flow straightening unit 203 extending downward of the combustion chamber 207 is formed. The straightening unit 203 is formed in a conical shape that increases in diameter toward the upper side (downstream side) of the combustion chamber 207. Thus, the flame and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber 207, so that the flame length in the axial direction of the combustion chamber can be shortened. Therefore, since the axial length of the combustion chamber can be shortened, downsizing and cost reduction of the combustor can be achieved.

  Further, since the oxidant gas chamber partition wall 205 is formed in a tapered shape that increases in diameter from the lower side to the upper side of the combustion chamber 207, the jet of the fuel gas 165 ejected from the fuel gas nozzle 210 It can diffuse in the radial direction of the combustion chamber 207 along the surface of the gas chamber partition wall 205. Thereby, the flame length in the axial direction of the combustion chamber 207 can be shortened.

  Further, as shown in FIG. 5, in each oxidant gas nozzle row 212, the distance between the oxidant gas chamber partition walls 205 is greater than the distance between the plurality of oxidant gas nozzles 211 located radially inward of the oxidant gas chamber partition wall 205. The distance between the plurality of oxidant gas nozzles 211 located radially outward is narrower. Therefore, since the radial outside of the combustion chamber 207 can be made negative pressure, the fuel gas, the flame, and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber 207. As a result, the flow paths provided around the combustor 200 (reforming flow path 66 shown in FIGS. 2 to 4, oxidant gas flow path 68 of the reforming unit 60, oxidant gas flow of the heat exchange unit 110 The heat of the flue gas 168 can be efficiently transferred to the gas flowing through the passage 118).

  Further, according to the fuel cell module M shown in FIGS. 1 to 4, since the above-described combustor 200 is applied, the properties of the stack exhaust gas which is a mixed gas of the fuel gas and the oxidant gas at the time of start or power generation. Even if the composition and the like are different, the stack exhaust gas can be stably burned by the single combustor 200. As a result, the structure of the combustor 200 and the periphery thereof can be simplified, so that the fuel cell module M can be miniaturized and the cost can be reduced.

  Moreover, since the vaporization unit 40 and the reforming unit 60 are each formed by multiple cylindrical walls, the structures of the vaporization unit 40 and the reforming unit 60 can be simplified, and the vaporization unit 40 and the reforming unit 60 can be modified. The part 60 can be miniaturized. Further, since the combustor 200, the reforming unit 60, and the vaporization unit 40 are coaxially disposed, the fuel cell module M can be miniaturized in the radial direction.

  The following modification may be applied to the fuel cell module M described above.

  That is, in the above embodiment, the plurality of cylindrical walls constituting the preheating unit 100, the combustion unit 90, the reforming unit 60, the vaporization unit 40, the heat exchange unit 110, etc. all have a perfect circular cross-section. It has a cylindrical shape. However, each of these cylindrical walls may be formed in an elliptical cylindrical shape whose cross section is elliptical.

  In addition, a plurality of cylindrical walls constituting the preheating unit 100, the combustion unit 90, the reforming unit 60, the vaporization unit 40, the heat exchange unit 110, etc. are formed in an elliptical cylindrical shape with those formed in a cylindrical shape. You may include both of what was done.

  Further, in the above embodiment, the vaporizing unit 40 sequentially extends from the inside to the outside of the quadruple cylindrical walls 41 to 44, the heat insulation space 45, the evaporation channel 46, the combustion exhaust gas channel 47, and the oxidant gas channel. The heat insulating space 45, the combustion exhaust gas flow path 47, the vaporization flow path 46, and the oxidant gas flow path 48 may be provided in order from the inside to the outside of the quadruple cylindrical walls 41 to 44. .

  Further, the heat exchange unit 110 has an oxidant gas flow path 118 between the inner cylindrical wall 111 and the central cylindrical wall 112, and the outer cylindrical wall 113 and the central cylindrical wall 112 There is a combustion exhaust gas passage 117 between them. However, the heat exchange unit 110 has the combustion exhaust gas flow path 117 between the inner cylindrical wall 111 and the central cylindrical wall 112, and between the outer cylindrical wall 113 and the central cylindrical wall 112. The structure may be modified to have the oxidant gas flow path 118 at the same time.

  Further, an oxidant gas flow path through which the oxidant gas 164 flows is formed across the heat exchange unit 110, the vaporization unit 40, and the reforming unit 60. However, the oxidant gas flow path may be omitted from the heat exchange unit 110, the vaporization unit 40, and the reforming unit 60. Further, in this case, the vaporizing unit 40 and the reforming unit 60 may be respectively formed by triple cylindrical walls, and the oxidant gas supply pipe 122 is connected to the upper end of the preheating flow channel 105. Also good.

  Moreover, in the said embodiment, although the rectification | straightening part 203 is formed conically, you may form it in dome shape.

  Even with such a configuration, as shown in FIG. 4, since the flue gas 168 can be collected to the outer peripheral side of the combustion chamber 207 and rectified by the rectifying unit 203, it is provided around the combustor 200. The heat of the combustion exhaust gas 168 flows into the flow path (reforming flow path 66 shown in FIGS. 2 to 4, the oxidizing gas flow path 68 of the reforming section 60, the oxidizing gas flow path 118 of the heat exchange section 110) Can be efficiently transmitted.

  Further, the fuel cell module M includes the heat exchange unit 110, but the heat exchange unit 110 may be omitted.

  Further, although the heat exchange unit 110 is provided radially outside the vaporization unit 40 and the reforming unit 60, the heat exchange unit 110 may be provided coaxially with the vaporization unit 40 above the vaporization unit 40.

  Moreover, although the preheating part 100 is comprised by the double cylindrical wall 101,102, you may be comprised by the triple cylindrical wall. Also, in this case, between the triple cylindrical walls constituting the preheating unit 100, the preheating flow passage 105 through which the oxidant gas flows, and the fuel gas flow passage communicating with the reforming flow passage 66 and through which the fuel gas flows May be formed.

  Further, instead of the preheating unit 100, a storage unit (a storage unit without a flow path) may be provided that simply stores the fuel cell stack 10. Further, when the housing portion is provided instead of the preheating portion 100, the reforming flow path 66 and the oxidant gas flow path 68 and the fuel cell stack 10 may be connected by piping or the like.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  A combustor 220 according to a second embodiment of the present invention is shown in FIG. In the combustor 220 according to the second embodiment, a fuel gas chamber top surface partition wall 222 is added to the combustor 200 (see FIG. 5) according to the above-described first embodiment. The fuel gas chamber top surface partition wall 222 is provided above the fuel gas nozzle 210 and is opposed to the fuel gas nozzle 210 with a gap. The fuel gas chamber top surface partition wall 222 is supported by a support member 224 fixed to the inner peripheral surface of the fuel gas chamber partition wall 204.

  With such a configuration, the direction of the jet flow of the fuel gas 165 jetted from the fuel gas nozzle 210 is divided into the oxidant gas chamber by the fuel gas chamber top surface partition wall 222 opposed to the fuel gas nozzle 210 with a gap. It can be properly directed radially outward of the wall 205. Thus, the fuel gas 165 can be more effectively diffused from the inside to the outside in the radial direction of the oxidant gas chamber partition wall 205.

Third Embodiment
Next, a third embodiment of the present invention will be described.

  A combustor 230 according to a third embodiment of the present invention is shown in FIG. The structure of the combustor 230 according to the third embodiment is changed as follows, with respect to the combustor 220 according to the second embodiment described above.

  That is, at the end (upper end) of the fuel gas chamber partition wall 204 on the side of the combustion chamber 207, a cylindrical projecting wall 232 which protrudes toward the combustion chamber 207 with respect to the oxidant gas chamber partition wall 205 is formed. . In addition, a fuel gas chamber top surface partition wall 222 that divides the combustion chamber 207 and the fuel gas chamber 208 is provided at the projecting end of the cylindrical projecting wall 232, and the fuel gas nozzle 210 has a cylindrical projecting wall 232. A plurality of cylindrical projecting walls 232 are formed at intervals in the circumferential direction of the cylinder. The plurality of fuel gas nozzles 210 are arranged at equal intervals in the circumferential direction of the cylindrical projecting wall 232.

  With this configuration, the fuel gas 165 can be ejected from the plurality of fuel gas nozzles 210 radially outward of the oxidant gas chamber partition wall 205. As a result, the jet direction of the fuel gas 165 is prevented from directly hitting the jet of the oxidant gas with the jet direction of the fuel gas 165, and the flow velocity of the fuel gas 165 is accelerated by utilizing the pressure loss of the fuel gas nozzle 210 The gas 165 can be diffused from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 more distantly.

  Note that FIG. 11 shows, for example, a combustion state where the air ratio is high and the flow rate of the oxidant gas 166 is excessive with respect to the flow rate of the fuel gas 165 in the combustor 230 according to the third embodiment. There is. Also in this case, as in the first embodiment, the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the oxidant gas chamber partition wall 205 and the fuel gas ejected from the fuel gas nozzle 210 A mixture gas is generated by mixing with 165 and the mixture gas is burned. The jet stream of the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially outside the oxidant gas chamber partition wall 205 is mixed with the combustion exhaust gas 168 generated by the combustion of the mixed gas and discharged from the combustion chamber 207. Be done.

  Further, FIG. 12 shows a combustion state in the case where the flow rate of the fuel gas 165 is large and the combustion amount is large in the combustor 230 according to the third embodiment. Also in this case, as in the first embodiment, the oxidant gas 166 ejected from the oxidant gas nozzle 211 located radially inward of the oxidant gas chamber partition wall 205 among the plurality of oxidant gas nozzles 211 is a mixed gas. Lack of oxygen necessary for the combustion of Therefore, the oxidant gas 166 jetted from the oxidant gas nozzle 211 provided from the radially inner side to the outer side of the oxidant gas chamber partition wall 205 and the fuel gas 165 jetted from the fuel gas nozzle 210 are mixed. Mixed gas is generated, and the mixed gas is burned.

  As described above, even in the example where the plurality of fuel gas nozzles 210 are formed in the cylindrical projecting wall 232, the fuel gas 165 and the oxidant gas are maintained to maintain the optimum combustion when the air ratio and the amount of combustion change. Because the mixing area with 166 and the flame area change and correspond, the flame does not blow out and is stable in a wide air ratio range from a normal air ratio (theoretical air ratio) to a high air ratio (for example, about λ = 5) Short flame combustion can be obtained.

  Further, FIG. 13 shows a state in which the recirculation flow 234 is generated in the jet of the oxidant gas 166 ejected from the oxidant gas nozzle 211 in the combustor 230 according to the third embodiment. Thus, it is considered that the recirculation flow 234 is generated in the jet of the oxidant gas 166 ejected from the oxidant gas nozzle 211, and the flame generated by the combustion of the mixed gas is maintained by the recirculation flow 234. It is considered to be a fire.

  Further, as shown in FIG. 14, in the combustor 230 according to the third embodiment, each of the plurality of fuel gas nozzles 210 is between the oxidant gas nozzle rows 212 adjacent in the circumferential direction of the oxidant gas chamber partition wall 205. Is located in Further, a fuel gas nozzle 210 is disposed between each of the plurality of oxidant gas nozzle rows 212.

  With such a configuration, the jet of the fuel gas 165 diffused along the oxidant gas chamber partition wall 205 can be made more effective by the jet of the oxidant gas 166 jetted from the plurality of oxidant gas nozzles 211. It can be involved. Thus, the fuel gas 165 and the oxidant gas 166 can be mixed more effectively.

  The following modification may be applied to the combustor 230 according to the third embodiment.

  That is, as shown in FIG. 15, in the combustor 230 according to the third embodiment, the oxidant gas chamber partition wall 205 extends from the fuel gas chamber partition wall 204 radially outward of the combustion chamber 207. It may have a portion 236 and an outer wall portion 238 extending from the outer peripheral portion of the inner wall portion 236 to the upper side of the combustion chamber 207.

  With such a configuration, for example, when the amount of combustion is small and the flow velocity of the jet of fuel gas is low, the oxidant gas 166 and the fuel gas 165 ejected from the oxidant gas nozzle 211 of the inner side wall 236 are sufficient. Even when the fuel gas 165 and the oxidant gas 166 are not mixed together, the mixed gas is generated by promoting the mixing of the fuel gas 165 and the oxidant gas 166 by the oxidant gas 166 ejected from the oxidant gas nozzle 211 of the outer wall 238. Does not blow out and stable short flame combustion can be obtained.

  Further, as shown in FIG. 16, in the combustor 230 according to the third embodiment, the oxidant gas chamber partition wall 205 extends along the radial direction of the combustion chamber 207 (horizontal direction of the combustion chamber 207). Also good.

  With this configuration, the axial dimension of the oxidant gas chamber partition wall 205 can be reduced, so the combustor 230 can be miniaturized in the axial direction.

  Further, as shown in FIG. 17, in the combustor 230 according to the third embodiment, the spark plug 151 (ignition electrode 154) may be disposed at a position radially offset from the center of the combustion chamber 207. . Further, in this case, the spark plug 151 (ignition electrode 154) may be disposed at the location of the largest flame according to the shape of the flame generated by the combustion of the mixed gas.

  With such a configuration, ignition and flame detection can be accurately performed by the ignition electrode 154 which also serves as a flame rod for flame current detection.

  Further, as shown in FIG. 18, in the combustor 230 according to the third embodiment, the fuel gas nozzles 210 may be disposed alternately between the plurality of oxidant gas nozzle rows 212.

  Even with such a configuration, the jet of the fuel gas 165 diffused along the oxidant gas chamber partition wall 205 is made more effective by the jet of the oxidant gas 166 jetted from the plurality of oxidant gas nozzles 211. It can be involved. Thus, the fuel gas 165 and the oxidant gas 166 can be mixed more effectively.

  In the example shown in FIG. 18, the fuel gas nozzles 210 are arranged alternately between the plurality of oxidant gas nozzle rows 212, but even if the number of the fuel gas nozzles 210 is halved in this way, it is equal. The flame shape can be maintained.

  In the third embodiment, the oxidant gas nozzle 211 is formed to penetrate along the thickness direction of the oxidant gas chamber partition wall 205, but as shown in FIG. It may be opened toward the radial outside and the upper side (axial other side) of the combustion chamber 207.

  With this configuration, the flame and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber 207 by the jet of the oxidant gas 166 ejected from the oxidant gas nozzle 211. As a result, the flow paths provided around the combustor 230 (the reforming flow path 66 shown in FIGS. 2 to 4, the oxidant gas flow path 68 of the reforming section 60, the oxidant gas flow of the heat exchange section 110) The heat of the flue gas can be efficiently transferred to the gas flowing through the passage 118).

  In the combustor 230 according to the third embodiment, the peripheral portion of the fuel gas nozzle 210 may be configured as follows. That is, in the modification shown in FIG. 20, a peripheral wall 240 extending upward from the radial inner end of the oxidant gas chamber partition wall 205 is provided around the fuel gas chamber partition wall 204. The upper end of the surrounding wall 240 is connected to the fuel gas chamber top surface partition wall 222. A gap between the fuel gas chamber partition wall 204 and the surrounding wall 240 is formed as an oxidant gas mixing channel 242.

  The oxidant gas mixing channel 242 is in communication with the oxidant gas chamber 209, and the oxidant gas 166 is supplied from the oxidant gas chamber 209 to the oxidant gas mixing channel 242. In the oxidant gas mixing flow path 242, the oxidant gas 166 supplied from the oxidant gas chamber 209 is mixed with the fuel gas 165 jetted from the fuel gas nozzle 210.

  Further, on the surrounding wall 240, a plurality of gas jet nozzles 252 are formed coaxially with each fuel gas nozzle 210. In the combustor 230, the fuel gas 165 jetted from the fuel gas nozzle 210 and mixed with the oxidant gas 166 by the oxidant gas mixing passage 242 is mixed with the oxidant gas chamber partition wall 205 through the gas jet nozzle 252. It spouts radially outward.

  With such a configuration, the fuel gas 165 mixed with the oxidant gas 166 is ejected from the gas ejection nozzle 252 by the oxidant gas mixing channel 242, so the oxidant gas 166 is added to the fuel gas 165. Because of the mixing, the combustion characteristics of the flame become close to the characteristics of the premixed flame, and the combustion range is narrowed from the normal air ratio (theoretical air ratio) to a slightly higher air ratio (for example, about λ = 1.5) However, the injection speed of the fuel gas 165 can be increased. As a result, the combustibility of the mixed gas can be enhanced, the concentration of unburned components in the exhaust gas can be suppressed, and the flame and the combustion exhaust gas can easily flow to the outer peripheral side of the combustion chamber. Combustion to the gas flowing in the flow paths (reforming flow path 66 shown in FIGS. 2 to 4, oxidizing gas flow path 68 of reforming section 60, oxidizing gas flow path 118 of heat exchange section 110) The heat of the exhaust gas can be transferred efficiently.

  In addition, as shown in FIG. 21, in the combustor 230 according to the third embodiment, even if the gas jet nozzles 252 are alternately disposed alternately with the oxidant gas nozzles 262 formed on the surrounding wall 240. good.

  With such a configuration, a jet of the oxidant gas 166 ejected from the oxidant gas nozzle 262 formed on the peripheral wall 240 and a jet from the gas ejection nozzle 252 are formed on the surface of the oxidant gas chamber partition wall 205. Not only from the jet of the oxidant gas 166 jetted from the oxidant gas nozzle 211 but also from the jet of the oxidant gas 166 jetted from the oxidant gas nozzle 262 since the flames 167 generated by the mixed gas alternately exist. Because the flame 167 is also supplied with oxygen, the combustibility of the mixed gas can be enhanced. Further, when the air ratio is high and the flow rate of the oxidant gas is excessive to the flow rate of the fuel gas, the jet of the oxidant gas 166 ejected from the oxidant gas nozzle 262 is a combustion exhaust gas generated by the combustion of the mixed gas. Because the air is mixed and discharged from the combustion chamber, the flame does not blow out to a higher air ratio (for example, about λ = 2.0) and stable short flame combustion can be obtained.

  Further, in the modification shown in FIG. 22, a step portion 254 is formed in the fuel gas chamber partition wall 204, and a plurality of thin tube portions 256 extending upward from the step portion 254 are formed in the step portion 254. It is done. The outlet portions of the plurality of thin tube portions 256 are formed as the fuel gas nozzle 210. A space between the step portion 254 and the fuel gas chamber top surface partition wall 222 (a space around the plurality of thin tube portions 256) is formed as an oxidant gas mixing flow path 242.

  The oxidant gas mixing channel 242 is in communication with the oxidant gas chamber 209, and the oxidant gas 166 is supplied from the oxidant gas chamber 209 to the oxidant gas mixing channel 242. Further, the fuel gas chamber top surface partition wall 222 is formed with a flange portion 258 covering the step portion 254 from above. A semitubular bulging portion 260 is formed in the flange portion 258 at a position corresponding to the fuel gas nozzle 210. The semitubular bulging portion 260 is opened outward in the radial direction of the combustion chamber 207, and the outlet portion of the bulging portion 260 is formed as a gas jet nozzle 252.

  Then, in this modification, the oxidant gas 166 supplied to the oxidant gas mixing channel 242 is mixed with the fuel gas 165 ejected from the fuel gas nozzle 210 inside the bulging portion 260, and this oxidant gas The fuel gas 165 mixed with the gas 166 is jetted outward in the radial direction of the oxidant gas chamber partition wall 205 through the gas jet nozzle 252.

  Even with such a configuration, the fuel gas 165 mixed with the oxidant gas 166 is ejected from the gas ejection nozzle 252 from the oxidant gas mixing channel 242, so the oxidant gas 166 is added to the fuel gas 165. Because of the mixing, the ejection speed of the fuel gas 165 can be increased.

  Further, as shown in FIG. 23, the upper end portion of the narrow tube portion 256 in which the fuel gas nozzle 210 is formed may be bent outward in the radial direction of the combustion chamber 207. Even with such a configuration, the oxidant gas 166 supplied to the oxidant gas mixing channel 242 can be mixed with the fuel gas 165 ejected from the fuel gas nozzle 210 inside the bulging part 260, The fuel gas 165 mixed with the oxidant gas 166 can be ejected outward in the radial direction of the oxidant gas chamber partition wall 205 through the gas ejection nozzle 252.

  In addition, the modification which can be combined among the modifications which concern on the above-mentioned 3rd embodiment may be combined suitably.

  Further, among the modifications according to the third embodiment described above, the modifications applicable to the first embodiment and the second embodiment described above are also applied to the first embodiment and the second embodiment described above. good.

  The combustors 200, 220, and 230 according to the first to third embodiments described above are more preferably applied to a fuel cell module, but may be applied to devices other than the fuel cell module, for example. In addition, the combustors 200, 220, and 230 according to the first to third embodiments described above may be used, for example, as a combustor for burning low-calorie gas such as biogas.

  Further, the combustors 200, 220, and 230 according to the first to third embodiments described above are more preferably arranged such that the axial direction of the combustion chamber 207 is vertical, but the axial direction of the combustion chamber 207 is more preferable. May be arranged in the horizontal direction.

  The first to third embodiments of the present invention have been described above, but the present invention is not limited to the above, and various modifications are possible without departing from the scope of the invention. Of course there is one.

M: fuel cell module, 10: fuel cell cell stack, 20: container, 21-29: tube, 40: vaporization part, 41-44: cylindrical wall, 45: heat insulation space, 46: vaporization flow path, 47: combustion Exhaust gas flow channel, 48: oxidant gas flow channel, 50: raw fuel supply pipe, 60: reforming section, 61 to 64: cylindrical wall, 65: heat insulation space, 66: reforming flow channel, 67: combustion exhaust gas flow Path 67A: Inlet part 68: Oxidizer gas flow path 70: Reforming catalyst layer 90: Combustion part 100: Preheating part 101, 102: Cylindrical wall 105: Preheating flow path 107: Fuel gas Piping 110 heat exchange section 111 112 cylindrical wall 117 combustion exhaust gas flow path 118 oxidant gas flow path 122 oxidant gas supply pipe 123 gas discharge pipe 150 pipe 151 ... spark plug, 154 ... ignition electrode, 161 ... raw fuel, 162 ... raw Fuel gas, 163: fuel gas, 164: oxidant gas, 165: fuel gas, 166: oxidant gas, 168: combustion exhaust gas, 200, 220, 230: combustor, 201: combustion chamber peripheral wall, 202: combustion chamber inner wall , 203: Rectifying portion, 204: Fuel gas chamber partition wall, 205: Oxidant gas chamber partition wall, 207: Combustion chamber, 208: Fuel gas chamber, 209: Oxidant gas chamber, 210: Fuel gas nozzle, 211: Oxidant Gas nozzle, 212: oxidant gas nozzle row, 222: fuel gas chamber top surface partition wall, 232: cylindrical projecting wall, 234: recirculation flow, 236: inner side wall, 238: outer side wall, 240: peripheral wall, 242 ... Oxidant gas mixing channel, 252 ... gas injection nozzle

Claims (12)

A combustion chamber in which a mixed gas in which a fuel gas and an oxidant gas are mixed is burned, a fuel gas chamber adjacent to the combustion chamber on one side in the axial direction of the combustion chamber and the fuel gas supplied from the outside; A cylindrical combustion chamber peripheral wall having an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside;
A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber circumferential wall inside the combustion chamber circumferential wall and partitioning the fuel gas chamber and the oxidant gas chamber;
An inner wall portion provided annularly around the fuel gas chamber partition wall, which divides the combustion chamber and the oxidant gas chamber, and which extends from the fuel gas chamber partition wall radially outward of the combustion chamber; , an oxidant gas chamber partition wall perforated and the outer wall portion, an extending from an outer peripheral portion of the inner wall portion to the other axial side of the combustion chamber,
Provided at an end of the fuel gas chamber partition wall on the side of the combustion chamber, the fuel gas is jetted into the combustion chamber to cause the fuel gas to flow over the entire circumference of the oxidant gas chamber partition wall. A fuel gas nozzle that diffuses radially from the inside to the outside of the chamber partition wall;
It is formed on the oxidant gas chamber partition wall and radially arranged around the central axis of the combustion chamber, and the oxidant gas is jetted into the combustion chamber to mix the oxidant gas with the fuel gas. With multiple oxidant gas nozzles,
Equipped with
When the oxygen necessary for the combustion of the mixed gas is sufficient for the oxidant gas jetted from the oxidant gas nozzle positioned on the radially inner side of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, the oxygen may be sufficient. The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. ,
In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, The mixing is performed by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Gas is produced,
Burner. A combustion chamber in which a mixed gas in which a fuel gas and an oxidant gas are mixed is burned, a fuel gas chamber adjacent to the combustion chamber on one side in the axial direction of the combustion chamber and the fuel gas supplied from the outside; A cylindrical combustion chamber peripheral wall having an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside;
A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber circumferential wall inside the combustion chamber circumferential wall and partitioning the fuel gas chamber and the oxidant gas chamber;
An oxidant gas chamber partition wall provided annularly around the fuel gas chamber partition wall, which divides the combustion chamber and the oxidant gas chamber, and extends along a radial direction of the combustion chamber ;
Provided at an end of the fuel gas chamber partition wall on the side of the combustion chamber, the fuel gas is jetted into the combustion chamber to cause the fuel gas to flow over the entire circumference of the oxidant gas chamber partition wall. A fuel gas nozzle that diffuses radially from the inside to the outside of the chamber partition wall;
It is formed on the oxidant gas chamber partition wall and radially arranged around the central axis of the combustion chamber, and the oxidant gas is jetted into the combustion chamber to mix the oxidant gas with the fuel gas. With multiple oxidant gas nozzles,
Equipped with
When the oxygen necessary for the combustion of the mixed gas is sufficient for the oxidant gas jetted from the oxidant gas nozzle positioned on the radially inner side of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, the oxygen may be sufficient. The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. ,
In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, The mixing is performed by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Gas is produced,
Burner. A combustion chamber in which a mixed gas in which a fuel gas and an oxidant gas are mixed is burned, a fuel gas chamber adjacent to the combustion chamber on one side in the axial direction of the combustion chamber and the fuel gas supplied from the outside; A cylindrical combustion chamber peripheral wall having an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside;
A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber circumferential wall inside the combustion chamber circumferential wall and partitioning the fuel gas chamber and the oxidant gas chamber;
An oxidant gas chamber partition wall annularly provided around the fuel gas chamber partition wall, which partitions the combustion chamber and the oxidant gas chamber;
Provided at an end of the fuel gas chamber partition wall on the side of the combustion chamber, the fuel gas is jetted into the combustion chamber to cause the fuel gas to flow over the entire circumference of the oxidant gas chamber partition wall. A fuel gas nozzle that diffuses radially from the inside to the outside of the chamber partition wall;
The oxidant gas chamber partition wall is radially arranged around the central axis of the combustion chamber, and is opened radially outward and axially toward the other side of the combustion chamber, and the oxidant gas is A plurality of oxidant gas nozzles that are jetted into the combustion chamber to mix the oxidant gas with the fuel gas;
Equipped with
When the oxygen necessary for the combustion of the mixed gas is sufficient for the oxidant gas jetted from the oxidant gas nozzle positioned on the radially inner side of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, the oxygen may be sufficient. The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. ,
In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, The mixing is performed by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Gas is produced,
Burner. The fuel gas nozzle is formed by an opening on the combustion chamber side in the cylindrical fuel gas chamber partition wall.
The combustor according to any one of claims 1 to 3 . And a fuel gas chamber top surface partition wall facing the fuel gas nozzle with a gap therebetween.
The combustor according to claim 4 . A combustion chamber in which a mixed gas in which a fuel gas and an oxidant gas are mixed is burned, a fuel gas chamber adjacent to the combustion chamber on one side in the axial direction of the combustion chamber and the fuel gas supplied from the outside; A cylindrical combustion chamber peripheral wall having an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside;
A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber circumferential wall inside the combustion chamber circumferential wall and partitioning the fuel gas chamber and the oxidant gas chamber;
An oxidant gas chamber partition wall annularly provided around the fuel gas chamber partition wall, which partitions the combustion chamber and the oxidant gas chamber;
Provided at an end of the fuel gas chamber partition wall on the side of the combustion chamber, the fuel gas is jetted into the combustion chamber to cause the fuel gas to flow over the entire circumference of the oxidant gas chamber partition wall. A fuel gas nozzle that diffuses radially from the inside to the outside of the chamber partition wall;
A cylindrical projecting wall formed at an end of the fuel gas chamber partition wall on the combustion chamber side and projecting toward the combustion chamber with respect to the oxidant gas chamber partition wall;
A fuel gas chamber top surface partition wall provided at a projecting end of the cylindrical projecting wall, which partitions the combustion chamber and the fuel gas chamber;
It is formed on the oxidant gas chamber partition wall and radially arranged around the central axis of the combustion chamber, and the oxidant gas is jetted into the combustion chamber to mix the oxidant gas with the fuel gas. With multiple oxidant gas nozzles,
A periphery formed on the periphery of the cylindrical projecting wall and projecting in the same direction as the cylindrical projecting wall from the radial inner end of the oxidant gas chamber partitioning wall and connected to the fuel gas chamber top surface partitioning wall With the wall,
It is formed between the cylindrical projecting wall and the peripheral wall, is communicated with the oxidizing gas chamber, and is supplied with the oxidizing gas from the oxidizing gas chamber and is supplied from the oxidizing gas chamber. An oxidant gas mixing flow path for mixing oxidant gas with the fuel gas jetted from the fuel gas nozzle formed at intervals along the circumferential direction of the cylindrical protruding wall;
The fuel gas which is formed on the peripheral wall and is jetted from the fuel gas nozzle and mixed with the oxidant gas by the oxidant gas mixing passage is directed radially outward of the oxidant gas chamber partition wall. A gas injection nozzle that ejects,
Equipped with
When the oxygen necessary for the combustion of the mixed gas is sufficient for the oxidant gas jetted from the oxidant gas nozzle positioned on the radially inner side of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, the oxygen may be sufficient. The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. ,
In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, The mixing is performed by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Gas is produced,
Burner. It is provided on the inner side of the peripheral wall of the combustion chamber, and is disposed on the other side of the combustion chamber in the axial direction, and the peripheral wall of the combustion chamber forms an inlet portion of a combustion exhaust gas flow passage into which the combustion exhaust gas generated in the combustion chamber flows The combustion chamber wall,
A conical or dome-shaped straightening unit extending from the combustion chamber wall toward one axial side of the combustion chamber and expanding in diameter toward the other axial side of the combustion chamber;
The combustor according to any one of claims 1 to 6. The oxidant gas chamber partition wall is formed in a tapered shape that increases in diameter from one axial direction side of the combustion chamber to the other side.
The combustor according to any one of claims 1 to 7. The plurality of oxidant gas nozzles form a plurality of oxidant gas nozzle rows in which a plurality of the oxidant gas nozzles are arranged in the radial direction of the oxidant gas chamber partition wall in the circumferential direction of the oxidant gas chamber partition wall,
In each of the oxidant gas nozzle rows, a plurality of the oxidations located radially outside the oxidant gas chamber partition wall with respect to a distance between the plurality of oxidant gas nozzles located radially inward of the oxidant gas chamber partition wall Agent gas nozzle spacing is narrower,
The combustor according to any one of claims 1 to 8 . A solid oxide fuel cell stack, which generates electricity by an electrochemical reaction between a fuel gas and an oxidant gas,
A vaporizing unit in which raw fuel is vaporized to generate raw fuel gas;
A reforming unit in which the fuel gas is generated from the raw fuel gas;
The stack exhaust gas is a mixture of a fuel gas which is an anode exhaust gas discharged from the fuel electrode of the fuel cell stack and an oxidant gas which is an air cathode exhaust gas discharged from the air electrode of the fuel cell stack. The combustor according to any one of claims 1 to 9 ,
A fuel cell module comprising: A solid oxide fuel cell stack, which generates electricity by an electrochemical reaction between a fuel gas and an oxidant gas,
A vaporizing unit in which raw fuel is vaporized to generate raw fuel gas;
A reforming unit in which the fuel gas is generated from the raw fuel gas;
The stack exhaust gas is a mixture of a fuel gas which is an anode exhaust gas discharged from the fuel electrode of the fuel cell stack and an oxidant gas which is an air cathode exhaust gas discharged from the air electrode of the fuel cell stack. Let the burner,
Have
The combustor is
A combustion chamber in which a mixed gas in which the fuel gas and the oxidant gas are mixed is burned, and a fuel gas chamber adjacent to the combustion chamber on one side in the axial direction of the combustion chamber and supplied with the fuel gas from the outside A cylindrical combustion chamber peripheral wall which has an oxidant gas chamber provided around the fuel gas chamber and to which the oxidant gas is supplied from the outside inside;
A cylindrical fuel gas chamber partition wall provided coaxially with the combustion chamber circumferential wall inside the combustion chamber circumferential wall and partitioning the fuel gas chamber and the oxidant gas chamber;
An oxidant gas chamber partition wall annularly provided around the fuel gas chamber partition wall, which partitions the combustion chamber and the oxidant gas chamber;
Provided at an end of the fuel gas chamber partition wall on the side of the combustion chamber, the fuel gas is jetted into the combustion chamber to cause the fuel gas to flow over the entire circumference of the oxidant gas chamber partition wall. A fuel gas nozzle that diffuses radially from the inside to the outside of the chamber partition wall;
It is formed on the oxidant gas chamber partition wall and radially arranged around the central axis of the combustion chamber, and the oxidant gas is jetted into the combustion chamber to mix the oxidant gas with the fuel gas. With multiple oxidant gas nozzles,
Equipped with
When the oxygen necessary for the combustion of the mixed gas is sufficient for the oxidant gas jetted from the oxidant gas nozzle positioned on the radially inner side of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, the oxygen may be sufficient. The mixed gas is generated by mixing the oxidant gas jetted from the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. ,
In the case where the oxygen necessary for the combustion of the mixed gas is insufficient in the oxidant gas jetted out of the oxidant gas nozzle located radially inward of the oxidant gas chamber partition wall among the plurality of oxidant gas nozzles, The mixing is performed by mixing the oxidant gas jetted from the oxidant gas nozzle provided from the radially inner side to the outer side of the oxidant gas chamber partition wall and the fuel gas jetted from the fuel gas nozzle. Gas is produced,
Fuel cell module. The combustor is provided above the fuel cell stack,
The reforming section is provided coaxially with the combustor above the combustor and is constituted by at least a triple tubular wall having a gap between each other, and the inner side of the triple tubular wall And between the cylindrical walls, a heat insulating space, a flue gas passage through which the flue gas discharged from the combustor flows, and the raw fuel gas is reformed using the heat of the flue gas to produce the fuel gas Each have their own reforming channels,
The vaporization section is provided coaxially with the reforming section above the reforming section, and is constituted by at least a triple cylindrical or elliptical cylindrical tubular wall having a gap between each other, and Between the inner and cylindrical walls of the triple cylindrical wall, the adiabatic space, the flue gas passage through which the flue gas flows, and the raw fuel gas are vaporized by heat exchange with the flue gas. Each have a vaporization flow path,
A fuel cell module according to claim 10 or 11 .