WO2009110509A1 - Heating apparatus - Google Patents

Abstract

Disclosed is a heating apparatus that comprises: a first flow channel (R1) in which unburned gas (G1) that includes combustible fuel, ejected through a nozzle hole (12) set to be smaller than the quenching distance and at a flow rate that enables a flame to be maintained, is burned, and through which flows combustion gas (G2) that is generated by the burning; and a second flow channel (R2) formed around the first flow channel in which the supplied unburned gas flows through the nozzle hole. The invention decreases the size of the combustion chamber in the heating apparatus that heats up a fluid to be heated, stabilizes the flame in the combustion chamber, and improves energy efficiency.

Description

Heating device

The present invention relates to a heating device for heating a fluid to be heated. This application claims priority based on Japanese Patent Application No. 2008-053901 filed in Japan on March 4, 2008 and Japanese Patent Application No. 2008-053903 filed on March 4, 2008 in Japan. , The contents of which are incorporated herein.

In restaurants, accommodation facilities, etc., there are cases where a small heating device for obtaining cooking steam or hot water for a bathroom is installed. For example, a heating device is disclosed in which water flowing in a pipe is heated with high-temperature combustion gas generated by burning fuel together with combustion air, and steam is obtained by this water. Moreover, the heating apparatus is used for heating various fluids (heated fluid) in addition to the generation of steam and hot water (see Patent Document 1).
JP 2007-139358 A

By the way, in the conventional heating apparatus, a large combustion chamber is required in order to secure time for complete combustion in the combustion chamber. For this reason, a heating apparatus cannot be reduced in size sufficiently. Therefore, the unburnt gas is heated with the combustion gas in advance and then burned, so that the flame is stably maintained even in a small combustion chamber. However, since the combustion gas is very hot, it is heated excessively before the unburned gas is supplied to the combustion chamber, and the unburned gas self-ignites, or fire spreads and burns outside the combustion chamber. There is a possibility. Furthermore, the amount of heat radiated from the large combustion chamber to the surroundings increases, resulting in a decrease in energy efficiency.

In view of the above-described problems, the present invention has an object of reducing the size of a combustion chamber in a heating apparatus for heating a fluid to be heated, stabilizing a flame in the combustion chamber, and improving energy efficiency.

In order to achieve the above object, the present invention is a heating device for heating a fluid to be heated, and is combustible ejected at a flow rate capable of maintaining a flame through a nozzle hole set to be smaller than a flame extinguishing distance. A first flow path in which the unburned gas containing fuel is burned and the combustion gas resulting from the combustion flows, and a second flow path in which the unburned gas supplied through the nozzle hole flows are provided.

In the above configuration, a second flow path may be formed around the first flow path.

According to the above heating device, the unburned gas is heated by flowing through the second flow path formed around the first flow path through which the combustion gas flows. Here, since the 2nd channel is formed around the 1st channel, the perimeter does not contact the 1st channel. Accordingly, a part of the heat transferred from the combustion gas is radiated from the unburned gas.

Further, in the present invention, a configuration may be adopted in which a third flow path that is surrounded by the first flow path and through which the fluid to be heated flows is provided.

Moreover, according to said heating apparatus, the said 3rd flow path is comprised from the interior space of 3rd piping, the said 1st flow path and the 1st piping which concentrically surrounds the said 3rd piping and the said 3rd piping, The second flow path may be constituted by a space sandwiched between the first pipe and a second pipe concentrically surrounding the first pipe.

Further, in the above configuration, a plurality of fins protruding from the outer peripheral surface of the third pipe toward the first flow path may be provided.

In the above configuration, the third pipe is bent at the first flow path side and the second flow path side at predetermined intervals.

Further, the first flow path formed around the second flow path and the third flow path formed around the first flow path through which the fluid to be heated flows may be provided.

According to the above heating device, the first flow path is formed around the second flow path through which the unburned gas flows, and the combustion gas flows through the first flow path. For this reason, the unburned gas flowing through the second flow path is heated by the high-temperature combustion gas flowing through the first flow path. In addition, a stable flame is formed by unburned gas being ejected from the second flow path through a nozzle hole set smaller than the extinguishing distance and at a flow rate at which the flame can be maintained. Further, the unburned gas is combusted by the stable flame and the third flow path is formed around the first flow path through which the combustion gas flows, and the fluid to be heated is flowed to the third flow path. *

In the above configuration, an introduction portion for introducing the combustion gas from the first flow path may be provided in an area outside the third flow path and on the opposite side of the first flow path.

Further, in the above configuration, the second flow path is configured from the internal space of the second pipe, and the first flow path is sandwiched between the second pipe and the first pipe that concentrically surrounds the second pipe. And the third flow path may be composed of a space sandwiched between the first pipe and a third pipe concentrically surrounding the first pipe.

Further, in the above configuration, the second flow path is configured from an internal space of the second pipe, and the third flow path is arranged apart from the second pipe around the second pipe. It may be configured from an internal space of piping, and the first flow path may be configured from a space surrounded by the second piping, the fourth piping, and a partition wall that closes the fourth piping.

According to the heating device of the present invention, the following excellent effects are exhibited.
(1) Since the second flow path through which the unburned gas flows is formed around the first flow path through which the combustion gas flows, the entire circumference of the second flow path does not contact the first flow path, and the combustion gas Part of the heat transferred from the heat is dissipated from the unburned gas. For this reason, the combustion chamber can be made small by heating the unburned gas, and it is possible to suppress the unburned gas from being heated excessively and to form a stable flame in the combustion chamber. Therefore, the combustion chamber of the heating device that heats the fluid to be heated can be made smaller, and the flame in the combustion chamber can be stabilized.
(2) Since the first flow path is formed around the second flow path through which the unburned gas flows, and the combustion gas is flowed through the first flow path, the unburned gas flowing through the second flow path is It is heated by the hot combustion gas flowing through. In addition, a stable flame is formed by unburned gas being ejected from the second flow path through a nozzle hole set smaller than the extinguishing distance and at a flow rate at which the flame can be maintained. Such a stable flame can be burned stably even if it directly touches the wall surface in contact with the cold fluid to be heated, and heat can be efficiently transferred to the wall surface. Then, the unburned gas is combusted by the stable flame, and the third flow path is formed around the first flow path through which the combustion gas flows, and the fluid to be heated is flowed to the third flow path. As a result, the fluid to be heated flowing in the third flow path is heated by directly heating the third flow path with a stable flame. Therefore, compared with the case where the flow path of the fluid to be heated is heated only by the combustion gas, the amount of heat can be efficiently transferred to the fluid to be heated. Can be improved.
(3) The unburned gas flowing through the second flow path is heated by the high-temperature combustion gas flowing through the first flow path, and the heated unburned gas passes through the nozzle hole set to be smaller than the flame extinguishing distance and flames. It is burned by being ejected from the second flow path at a flow rate at which it can be maintained. In the above configuration, since the unburned gas is sufficiently heated by the high-temperature combustion gas, a large combustion chamber for stable combustion is not required, and combustion can be continued in the combustion chamber of the microchannel. . Therefore, a combustion chamber can be made small and a heating apparatus can be reduced in size.

It is a perspective view showing a typical schematic structure of a small boiler as one embodiment of the heating device of the present invention. It is a horizontal sectional view which shows the typical schematic structure of the apparatus of FIG. FIG. 2 is a vertical sectional view showing a schematic schematic configuration of the apparatus of FIG. 1. It is a vertical sectional view showing a schematic schematic configuration of a small boiler in a second embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 3rd embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 4th embodiment of the present invention. It is a perspective view which shows the typical schematic structure of the small boiler in 5th Embodiment of this invention. FIG. 8 is a horizontal sectional view showing a schematic schematic configuration of the apparatus of FIG. 7. It is a vertical sectional view showing a schematic schematic configuration of the apparatus of FIG. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 6th embodiment of the present invention. It is a perspective view which shows the typical schematic structure of the apparatus of FIG. It is a horizontal sectional view showing a typical schematic structure of a small boiler in a 7th embodiment of the present invention. It is a horizontal sectional view showing a typical schematic structure of a small boiler in an 8th embodiment of the present invention.

Explanation of symbols

B1, B2, B3, B4, B101, B102, B103, B104 Small boiler (heating device)
DESCRIPTION OF SYMBOLS 1,101 1st piping 12, 112 Nozzle hole 2,102 2nd piping 3,103 3rd piping 4,104 4th piping R1 Combustion gas flow path (1st flow path)
R2 Unburned gas channel (second channel)
R3 water channel (third channel)
G1 Unburned gas G2 Combustion gas W Water (heated fluid)
K combustion chamber 105 partition 106 introduction part

Hereinafter, an embodiment of a heating device according to the present invention will be described with reference to the drawings, taking a small boiler as an example. Further, in the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

(First embodiment)
1 to 3 are schematic configuration diagrams schematically showing a small boiler B1 of the present embodiment, in which FIG. 1 is a perspective view, FIG. 2 is a horizontal sectional view, and FIG. 3 is a vertical sectional view. As shown in these drawings, the small boiler B1 of the present embodiment includes a first pipe 1 (first pipe), a second pipe 2 (second pipe), and a third pipe 3 (third pipe). It has a triple tube structure arranged concentrically in plan view.

The first pipe 1 is a pipe that extends in the vertical direction and has a lower end 11 that is a closed end, and has a nozzle hole whose diameter is set smaller than the extinguishing distance of unburned gas in the side wall near the lower end 11. A plurality of 12 are formed. And the 1st piping 1 is formed with the material (for example, brass (brass) etc.) with high heat conductivity.

The second pipe 2 is a pipe that extends in the vertical direction and surrounds the first pipe 1 concentrically. The lower end 21 is a closed end, and is formed of a material having high heat transfer like the first pipe 1. ing.

The third pipe 3 is a pipe that extends in the vertical direction and is inserted into the first pipe 1, and the lower end 31 is a closed end. The third pipe 3 is preferably made of a material having high heat transfer like the first pipe 1 and the second pipe 2.

And the internal space of the 3rd piping 3 is the water flow path R3 (3rd flow path) through which water (to-be-heated fluid) W flows. That is, in the small boiler B <b> 1 of the present embodiment, the water flow path R <b> 3 is configured from the internal space of the third pipe 3. A water supply part (not shown) for supplying water W to the water flow path R3 is connected to the vicinity of the lower end of the water flow path R3, and the water W whose flow rate is adjusted by the water supply part is supplied to the water flow path R3. Is done. Further, a discharge part (not shown) for discharging steam generated by evaporation of the water W in the water flow path R3 is connected in the vicinity of the upper end of the water flow path R3. The steam whose flow rate is adjusted is discharged to the outside.

In addition, in the space between the third pipe 3 and the first pipe 1, the unburned gas G1 is combusted, and the combustion gas flow path R1 (the first gas flow through which the unburned gas G1 is burned) flows. 1 flow path). That is, in small boiler B1 of this embodiment, combustion gas flow path R1 is comprised from the space pinched | interposed into the 3rd piping 3 and the 1st piping 1 surrounding this 3rd piping concentrically. The water channel R3 is surrounded by the combustion gas channel R1. The vicinity of the lower end of the combustion gas flow path R1 (near the nozzle hole 12) is a combustion chamber K in which the unburned gas G1 ejected from the nozzle hole 12 burns. The combustion chamber K is provided with an ignition device (not shown).

Further, the space between the first pipe 1 and the second pipe 2 is an unburned gas flow path R2 (second flow path) through which unburned gas G1 containing combustible fuel flows. That is, the unburned gas flow path R2 is composed of a space sandwiched between the first pipe 1 and the second pipe 2 concentrically surrounding the first pipe. The upper end of the second pipe 2 is connected to an unburned gas supply device (not shown) for supplying unburned gas G1 to the unburned gas flow path R2.

Also, as the unburned gas G1, a mixture of fuel and oxidant can be used. As the fuel, petroleum fuel, natural gas, or the like can be used.

In the small boiler B1 of the present embodiment as described above, first, the unburned gas G1 is supplied from the unburned gas supply device connected to the second pipe 2 to the unburned gas flow path R2 and formed in the first pipe 1. A flame is formed in the combustion chamber K by igniting and burning the unburned gas G1 ejected from the nozzle hole 12 formed. The combustion gas G2 generated by burning the unburned gas G1 flows through the combustion gas flow path R1 and is discharged.

Thus, when a flame is formed in the combustion chamber K, the high-temperature combustion gas G2 flows through the combustion gas flow path R1, so that the unburned gas G1 flowing through the unburned gas flow path R2 is heated. That is, the heat quantity of the combustion gas G2 is transferred to the unburned gas G1 through the first pipe 1 functioning as a heat exchange wall, and the unburned gas G1 is heated.

The unburned gas G1 heated by heat exchange with the combustion gas G2 is jetted into the first pipe 1 through the nozzle hole 12 in a heated state. Then, the unburned gas G1 ejected from the nozzle hole 12 burns in the combustion chamber K.

And since the nozzle hole 12 formed in the 1st piping 1 is set smaller than the flame extinction distance in the combustion environment in the combustion chamber K of the unburned gas G1, a flame spreads to unburned gas flow path R2. It is suppressed. Further, since the unburned gas flow path R2 is formed around the combustion gas flow path R1, the entire circumference of the unburned gas flow path R2 is not in contact with the combustion gas flow path R1, and heat is transferred from the combustion gas G2. Part of the amount of heat generated is radiated from the unburned gas G1. For this reason, it is suppressed that unburned gas G1 is heated too much, a flame spreads to unburned gas flow path R2, and it is suppressed that unburned gas G1 self-ignites. As a result, the flame is stabilized in the combustion chamber K, and combustion is continued.

Further, as described above, the unburned gas G1 supplied to the combustion chamber K via the unburned gas flow path R2 flows through the combustion gas flow path R1 in a state where the combustion in the combustion chamber K is continued. Heated by the combustion gas G2. For this reason, a stable flame can be formed even if the combustion chamber K is extremely small as compared with the combustion chamber in the conventional heating device.

Thus, in a state where a flame is stably formed in the combustion chamber K and combustion is continued, the water W in the water channel R3 is the flame in the combustion chamber K and the combustion gas G2 in the combustion gas channel R2. Evaporates by heating. That is, the heat generated by the combustion is transferred to the water W through the second pipe 2 functioning as a heat exchange wall, and as a result, the water W is heated and evaporated. And the vapor | steam produced | generated by water W evaporating is discharged | emitted outside the small boiler B1 via the discharge part not shown. Here, since the water flow path R3 is surrounded by the combustion gas flow path R1, heat can be transferred from the entire circumference of the water flow path R3 to the water W, and the water W can be efficiently heated. .

According to the small boiler B1 of the present embodiment, the unburned gas flow path R2 through which the unburned gas G1 flows is formed around the combustion gas flow path R1 through which the combustion gas G2 flows. The entire circumference of the path R2 does not come into contact with the unburned gas flow path R1, and part of the heat transferred from the combustion gas G2 is radiated from the unburned gas G1. For this reason, the combustion chamber K can be made smaller by heating the unburned gas G1, and the flame in the combustion chamber K can be stabilized by suppressing the unburned gas G1 from being heated too much. It becomes. Therefore, the combustion chamber K can be made smaller and the flame in the combustion chamber K can be stabilized.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

FIG. 4 is a vertical sectional view showing a schematic configuration diagram schematically showing the small boiler B2 of the present embodiment. As shown in this figure, the small boiler B2 of the present embodiment includes a fourth pipe 4 surrounding the second pipe 2 concentrically. A space sandwiched between the second pipe 2 and the fourth pipe 4 is configured as a storage unit 5 that is connected to the water flow path R3 and stores water W.

According to the small boiler B2 of the present embodiment having such a configuration, the water W once stored in the storage unit 5 is supplied to the water flow path R3, but the water W is supplied from the unburned gas G1 in the storage unit 5. Receive a portion of the heat released. For this reason, the quantity of heat radiated from the unburned gas G1 can be used for heating the water W, and the water W can be heated more efficiently.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the third embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 5 is a horizontal sectional view showing a schematic schematic configuration diagram of the small boiler B3 of the present embodiment. As shown in the figure, the small boiler B3 of the present embodiment includes a plurality of fins 10 protruding from the outer peripheral surface of the third pipe 3 toward the combustion gas flow path R1. The fins 10 are integrally formed with the third pipe 3 and are formed of a material having high heat transfer properties as with the third pipe 3.

According to the small boiler B3 of the present embodiment having such a configuration, the fin 10 increases the heat exchange area between the combustion gas G2 flowing through the combustion gas flow path R1 and the water W flowing through the water flow path R3, and is more efficient. Thus, it becomes possible to heat the water W.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the description of the fourth embodiment, the description of the same parts as those of the first embodiment will be omitted or simplified.

FIG. 7 is a horizontal sectional view showing a schematic schematic configuration diagram of the small boiler B4 of the present embodiment. As shown in this figure, in the small boiler B4 of the present embodiment, the second pipe 2 is bent into a star shape at a predetermined interval between the combustion gas flow path R1 side and the water flow path R3 side.

According to the small boiler B4 of the present embodiment as described above, the third pipe 3 is bent at a predetermined interval to have a star shape, whereby the combustion gas G2 and the water flow path R3 flowing through the combustion gas flow path R1 are separated. The heat exchange area with the flowing water W increases, and the water W can be heated more efficiently.

(Fifth embodiment)
FIGS. 7 to 9 are schematic configuration diagrams schematically showing a small boiler B101 according to a fifth embodiment of the present invention. FIG. 7 is a perspective view, FIG. 8 is a horizontal sectional view, and FIG. 9 is a vertical sectional view. . As shown in these drawings, the small boiler B101 of the present embodiment includes a first pipe 101 (first pipe), a second pipe 102 (second pipe), and a third pipe 103 (third pipe). It has a triple tube structure arranged concentrically in plan view.

The second pipe 102 is a pipe that extends in the vertical direction and has a lower end 111 as a closed end, and has a nozzle hole whose diameter is set smaller than the extinguishing distance of unburned gas in the side wall near the lower end 111. A plurality of 112 are formed. And the 2nd piping 102 is formed with the material (for example, brass (brass) etc.) with high heat conductivity. The internal space of the second pipe 102 is an unburned gas flow path R2 (second flow path) through which unburned gas G1 containing combustible fuel flows. That is, in the small boiler B101 of the present embodiment, the unburned gas flow path R2 is configured from the internal space of the second pipe 102. The second pipe 102 is connected at its upper end to an unburned gas supply device (not shown) for supplying unburned gas G1 to the unburned gas flow path R2.

Also, as the unburned gas G1, a mixture of fuel and oxidant can be used. As the fuel, petroleum fuel, natural gas, or the like can be used.

The first pipe 101 is a pipe that extends in the vertical direction and surrounds the second pipe 102 concentrically. The lower end 121 is a closed end, and is formed of a material having high heat transfer like the second pipe 102. ing. In the space between the first pipe 101 and the second pipe 102, the unburned gas G1 is burned, and the combustion gas flow path R1 (in which the combustion gas G2 generated by burning the unburned gas G1 flows) First flow path). That is, in the small boiler B101 of the present embodiment, the combustion gas flow path R1 is composed of a space sandwiched between the second pipe 102 and the first pipe 101 that concentrically surrounds the second pipe 102. The vicinity of the lower end of the combustion gas flow path R1 (near the nozzle hole 112) is a combustion chamber K in which the unburned gas G1 ejected from the nozzle hole 112 burns. The combustion chamber K is provided with an ignition device (not shown).

The third pipe 103 is a pipe that extends in the vertical direction and concentrically surrounds the first pipe 101, and the lower end 131 is a closed end. In addition, it is preferable that this 3rd piping 103 is formed with a material with low heat conductivity. A space between the third pipe 103 and the first pipe 101 is a water flow path R3 (third flow path) through which water (heated fluid) W flows. That is, in the small boiler B101 of the present embodiment, the water flow path R3 is configured by a space sandwiched between the first pipe 101 and the third pipe 103 concentrically surrounding the first pipe 101. A water supply part (not shown) for supplying water W to the water flow path R3 is connected near the lower end of the water flow path R3, and the water W whose flow rate is adjusted to the water flow path R3 by this water supply part. Is supplied. Further, a discharge part (not shown) for discharging steam generated by evaporation of the water W of the water flow path R3 is connected to the vicinity of the upper end of the water flow path R3. The steam whose flow rate is adjusted is discharged to the outside.

In the small boiler B101 of the present embodiment having such a configuration, first, the unburned gas G1 is supplied from the unburned gas supply device connected to the second pipe 102 to the unburned gas flow path R2, and the second pipe 102 is used. A flame is formed in the combustion chamber K by igniting and burning the unburned gas G1 ejected from the nozzle hole 112 formed in the above. The combustion gas G2 generated by burning the unburned gas G1 flows through the combustion gas flow path R1 and is discharged.

When a flame is formed in the combustion chamber K in this manner, the high-temperature combustion gas G2 flows through the combustion gas flow path R1 formed around the unburned gas flow path R2, and thus the unburned gas flow through the unburned gas flow path R2. The fuel gas G1 is heated. That is, the heat quantity of the combustion gas G2 is transferred to the unburned gas G1 through the second pipe 102 functioning as a heat exchange wall, and the unburned gas G1 is heated.

The unburned gas G1 heated by exchanging heat with the combustion gas G2 is ejected to the outside of the second pipe 102 through the nozzle hole 112 in a state where the unburned gas G1 is heated to the vicinity of the ignitable temperature. The unburned gas G1 ejected from the nozzle hole 112 is ignited and burned by the flame formed in the combustion chamber K.

And since the nozzle hole 112 formed in the 2nd piping 102 is set smaller than the flame extinction distance in the combustion environment in the combustion chamber K of the unburned gas G1, a flame does not spread to unburned gas flow path R2. . For this reason, the flame is stabilized in the combustion chamber K, and combustion is continued.

Further, as described above, the unburned gas G1 supplied to the combustion chamber K via the unburned gas flow path R2 flows through the combustion gas flow path R1 in a state where the combustion in the combustion chamber K is continued. Heated by the combustion gas G2. For this reason, even if the combustion chamber K is made extremely small as compared with the combustion chamber in the conventional heating device, a stable flame can be formed.

Thus, in a state where a flame is stably formed in the combustion chamber K and combustion is continued, the water W in the water channel R3 is composed of the flame in the combustion chamber K and the combustion gas G2 in the combustion gas channel R1. Is evaporated by heating. That is, the heat amount of the flame and the heat amount of the combustion gas G2 are transferred to the water W through the first pipe 101 functioning as a heat exchange wall, and as a result, the water W is heated and evaporated. And the vapor | steam produced | generated by water W evaporating is discharged | emitted outside the small boiler B101 via the discharge part not shown.

According to the small boiler B101 of the present embodiment as described above, the combustion gas passage R1 through which the combustion gas G2 flows is formed around the unburned gas passage R2 through which the unburned gas G1 flows. For this reason, the unburned gas G1 flowing through the unburned gas flow path R2 is heated by the high-temperature combustion gas G2 flowing through the combustion gas flow path R1. Further, a stable flame is formed by the unburned gas G1 being ejected from the unburned gas flow path R2 through the nozzle hole 112 set to be smaller than the extinguishing distance and at a flow rate capable of maintaining the flame. . Such a stable flame can be directly brought into contact with the wall surface (first pipe 101) in contact with the cold water W. A water flow path R3 is formed around the combustion gas flow path R1 where a stable flame is formed, and water W is caused to flow through the water flow path R3. As a result, the water W flowing through the water channel R3 is heated by directly heating the water channel R3 with a stable flame. Therefore, compared with the case where the water flow path R3 is heated only by the combustion gas G2, the amount of heat can be efficiently transferred to the water W. Therefore, according to the small boiler B101 of this embodiment, energy efficiency can be improved.

Further, according to the small boiler B101 of the present embodiment, the unburned gas G1 flowing through the unburned gas flow path R2 is heated by the high-temperature combustion gas G2 flowing through the combustion gas flow path R1, and the heated unburned gas G1. Is combusted by being ejected from the unburned gas flow path R2 through the nozzle hole 112 set to be smaller than the flame extinguishing distance and at a flow rate capable of maintaining the flame. In the case of adopting the above configuration, the unburned gas G1 is sufficiently heated by the high-temperature combustion gas G2, so that stable combustion can be continued in the small combustion chamber K. Therefore, the combustion chamber can be made small and the apparatus can be miniaturized.

Thus, according to the small boiler B101 of the present embodiment, it is possible to improve the energy efficiency and at the same time further reduce the size of the apparatus.

(Sixth embodiment)
Next, still another sixth embodiment of the present invention will be described. In the description of the sixth embodiment, the description of the same parts as those of the fifth embodiment will be omitted or simplified.

10 and 11 are schematic configuration diagrams schematically showing the small boiler B102 of the present embodiment, in which FIG. 10 is a horizontal sectional view and FIG. 11 is a perspective view. As shown in these drawings, in the small boiler B102 of the present embodiment, the unburned gas flow path R2 is configured from the internal space of the second pipe 102 in the same manner as the small boiler B101 of the fifth embodiment, and the water flow path R3. Is composed of the internal space of a plurality of fourth pipes 104 arranged away from the second pipe 102 around the second pipe 102, and the combustion gas flow path R1 is the second pipe 102, the fourth pipe 104, and the fourth. It is composed of a space surrounded by a partition wall 105 that closes between the pipes 104.

And as shown in FIG. 11, the height of the partition 105 is set low compared with the height of the 2nd piping 102 and the 4th piping 104. FIG. As a result, a gap is formed between the fourth pipes 104 in the upper part of the small boiler B102. The gap functions as an introduction portion 106 that introduces the combustion gas G2 into the region outside the water flow channel R3 and the region opposite to the combustion gas flow channel R1.

In the small boiler B102 of the present embodiment configured as described above, as in the fifth embodiment, the unburned gas G1 heated by heat exchange with the combustion gas G2 is ejected into the combustion gas flow path R1. When the combustion gas G2 is newly generated after being combusted, a part of the combustion gas G2 goes around to the back side of the fourth pipe 104 (the side opposite to the combustion gas flow path R1) through the introduction portion 106. For this reason, the whole periphery of the 4th piping 104 is heated with the combustion gas G2, and the water W can be heated more efficiently. Therefore, energy efficiency can be further improved.

(Seventh embodiment)
Next, still another seventh embodiment of the present invention will be described. In the description of the seventh embodiment, the description of the same parts as those of the fifth embodiment is omitted or simplified.

FIG. 12 is a schematic schematic configuration diagram of the small boiler B103 of the present embodiment, and is a horizontal sectional view. As shown in this figure, the small boiler B103 of the present embodiment includes a plurality of fins 110 protruding from the outer peripheral surface of the first pipe 101 toward the water flow path R3. The fins 110 are integrally formed with the first pipe 101 and are formed of a material having high heat conductivity, like the first pipe 101.

According to the small boiler B103 of the present embodiment having such a configuration, the fin 110 increases the heat exchange area between the combustion gas G2 flowing through the combustion gas flow path R1 and the water W flowing through the water flow path R3, and is more efficient. Thus, it becomes possible to heat the water W. Therefore, energy efficiency can be further improved.

(Eighth embodiment)
Next, still another eighth embodiment of the present invention will be described. In the description of the eighth embodiment, the description of the same parts as those of the fifth embodiment is omitted or simplified.

FIG. 13 is a schematic schematic configuration diagram of a small boiler B104 of the present embodiment, and is a horizontal sectional view. As shown in this figure, in the small boiler B104 of this embodiment, the first pipe 1 is bent into a star shape at a predetermined interval between the combustion gas flow path R1 side and the water flow path R3 side.

According to the small boiler B104 of the present embodiment having such a configuration, the first pipe 101 is bent at a predetermined interval to form a star shape, so that the combustion gas G2 and the water flow path flowing through the combustion gas flow path R1. The heat exchange area with the water W flowing through R3 increases, and the water W can be heated more efficiently. Therefore, energy efficiency can be further improved.

The preferred embodiment of the heating device according to the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, a small boiler has been described as an example of the heating device. However, the present invention is not limited to this, and can be applied to a water heater that heats water to form hot water, an apparatus that heats oil or gas, and the like. Moreover, it is applicable also to industrial products, such as a large sized boiler and a fluidized bed boiler using the heated powder fluid. In addition, when the heating device of the present invention is applied to a circulating fluidized bed boiler, the powdered fluid can be transported using combustion gas.

Further, the outer shapes and cross-sectional shapes of the first pipes 1 and 101, the second pipes 2 and 102, the third pipes 3 and 103, and the fourth pipes 4 and 104 in the first to eighth embodiments are examples, and are arbitrary. Can be set to

According to the present invention, in the heating device that heats the fluid to be heated, the combustion chamber can be made smaller, the flame in the combustion chamber can be stabilized, and the energy efficiency can be improved.

Claims (9)

A first flow path through which unburned gas containing combustible fuel injected through a nozzle hole set smaller than the flame extinguishing distance and jetted at a flow rate capable of maintaining a flame is combusted and in which the combustion gas from the combustion flows. And a second flow path through which the unburned gas supplied through the nozzle hole flows. The heating apparatus according to claim 1, further comprising a third flow path that is surrounded by the first flow path and through which a fluid to be heated flows, and wherein the second flow path is formed around the first flow path. The third flow path is configured from an internal space of a third pipe, the first flow path is configured from a space sandwiched between the third pipe and a first pipe that concentrically surrounds the third pipe, and the second The heating apparatus according to claim 2, wherein the flow path includes a space sandwiched between second pipes concentrically surrounding the first pipe and the first pipe. The heating device according to claim 3, comprising a plurality of fins protruding from the outer peripheral surface of the third pipe toward the first flow path. The heating apparatus according to claim 3, wherein the third pipe is bent at the first flow path side and the second flow path side at predetermined intervals. The second flow path, the first flow path formed around the second flow path, and the third flow path formed around the first flow path through which the fluid to be heated flows. Heating device. The heating apparatus according to claim 6, further comprising an introduction section that introduces the combustion gas from the first flow path in an area outside the third flow path and on the opposite side of the first flow path. The second flow path is configured from an internal space of a second pipe, and the first flow path is configured from a space sandwiched between the second pipe and a first pipe that concentrically surrounds the second pipe, The heating device according to claim 6 or 7, wherein the third flow path includes a space sandwiched between the first pipe and a third pipe that concentrically surrounds the first pipe. The second flow path is configured from an internal space of a second pipe, and the third flow path is configured from an internal space of a plurality of fourth pipes that are arranged apart from the second pipe around the second pipe. The heating device according to claim 6 or 7, wherein the first flow path is configured by a space surrounded by the second pipe, the fourth pipe, and a partition wall that closes between the fourth pipes.

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