WO2019156064A1 - Furnace wall structure of wet bottom furnace, and wet bottom furnace - Google Patents

Abstract

The objective of the present invention is to provide a furnace wall structure of a wet bottom furnace with which it is possible to increase the cooling effect of a refractory material without changing the total quantity of studs, and with which it is possible to reduce wall-thinning of the refractory material due to erosion. A furnace wall structure (161) of a wet bottom furnace is provided with a peripheral wall tube (162) forming a furnace wall of the wet bottom furnace, and a plurality of studs (163) which are arranged side by side on a side surface of the peripheral wall tube (162) at fixed intervals in the axial direction of the peripheral wall tube (162), in such a way as to extend in a radial direction from the center of the peripheral wall tube (162), wherein, in an arbitrarily defined plane perpendicular to the axial direction of the peripheral wall tube (162), the studs (163) that are farthest from one another are provided within an angle range of 50 to 140° around the peripheral wall tube (162).

Description

Wet furnace wall structure and wet furnace

The present invention relates to a furnace wall structure of a wet furnace and a wet furnace applied to a wet furnace such as a furnace for melting and discharging ash.

Conventionally, as a gasifier facility, carbon-containing fuel gasification that generates combustible gas by supplying carbon-containing solid fuel such as coal into the gasifier and partially combusting the carbon-containing solid fuel for gasification Equipment (coal gasification equipment) is known. As such a coal gasification facility, for example, one disclosed in Patent Document 1 has been reported.

In the peripheral wall pipe that constitutes the furnace wall of the gasification furnace equipment, a stud for preventing the refractory from falling off is placed on the surface inside the furnace of the pipe, and the refractory material is applied to fill the stud. Yes. Since the thickness of the refractory material is relatively thin, the strength required for the stud supporting the refractory material is small.

Japanese Patent No. 4295731

There is a problem that the refractory material installed on the peripheral wall pipe is susceptible to thinning due to erosion by slag when the temperature is high. In particular, when the thickness of the refractory material is reduced in the fin portion of the peripheral wall pipe (the part on the fin side connecting the peripheral wall pipes), the problem is that the refractory material is cracked or dropped or the thermal load on the peripheral wall pipe increases. Occurs. In order to prevent the occurrence of such a problem, it was necessary to leave the refractory material applied to the peripheral wall pipe thick (to suppress the thinning).

It has been confirmed that the thickness of the refractory material after erosion at the crown portion of the peripheral wall pipe (the portion that protrudes most inside the furnace) is not significantly affected by the cooling provided by the stud provided on the crown portion. On the other hand, it has been confirmed that the stud provided in the fin portion is effective in suppressing erosion of the refractory material in the fin portion. From the above, it can be seen that the stud provided in the crown portion plays a role of holding the refractory material, whereas the stud provided in the fin portion plays both the roles of holding the refractory material and cooling. In the current stud diameter (diameter), the margin of strength for holding the refractory material is large, so the margin of the stud arrangement pattern is large.

However, so far, the difference between the role of the stud provided in the crown portion as described above and the role of the stud provided on the fin portion side has been hardly considered. Therefore, at present, a furnace wall structure of a wet furnace that can increase the cooling effect of the refractory material without changing the total amount (weight) of the stud and can reduce the thinning of the refractory material due to erosion has not appeared. It was.

The present invention has been made in view of such circumstances, and can improve the cooling effect of the refractory material without changing the total amount of studs, and can reduce the thickness of the refractory material due to erosion. It aims at providing the furnace wall structure of a furnace.

In order to solve the above problems, the present invention employs the following means.
According to the present invention, a peripheral wall tube constituting a furnace wall of a wet furnace, and extending in a radial direction from the center of the peripheral wall tube along the axial direction of the peripheral wall tube with a constant interval on a side surface of the peripheral wall tube. A plurality of studs arranged side by side, and in any plane perpendicular to the axial direction of the peripheral wall tube, the studs that are farthest from each other have an angle of 50 to 140 ° around the center of the peripheral wall tube A furnace wall structure of a wet furnace provided in a range is provided.

According to the furnace wall structure of the wet furnace of the present invention, the studs farthest from each other on a specific surface as described above are provided so as to have an angle range of 50 to 140 ° around the center of the peripheral wall tube. It becomes easy to hold and cool the refractory material applied to the fin portion of the pipe. Thereby, the cooling effect of a refractory material can be heightened, without changing a stud total amount (weight). Thinning of the refractory material due to erosion can be reduced. When the angle range is less than 50 ° or more than 140 °, the cooling effect of the refractory material is insufficient, and the refractory material is significantly thinned.

In the furnace wall structure of the wet furnace, the plurality of studs are alternately arranged in the order of one in the crown portion that protrudes most inside the furnace and two that are furthest away from each other along the axial direction of the peripheral wall tube. Is preferably provided.

If the studs are arranged in this way, the peripheral wall pipe (crown portion, etc.) can be held with a minimum number.

The present invention provides a wet furnace having the above-described wet furnace wall structure.

Since the wet furnace of the present invention has the above-described furnace wall structure of the wet furnace, the thickness of the refractory material due to erosion can be reduced. Accordingly, the wet furnace is excellent in economic efficiency and reliability.

The furnace wall structure of the wet furnace of the present invention can enhance the cooling effect of the refractory material without changing the total stud weight (weight). Thinning of the refractory material due to erosion can be reduced.

It is a schematic block diagram which shows the coal gasification combined cycle power generation equipment which concerns on one Embodiment of this invention. It is the schematic block diagram which showed the gasification furnace installation of FIG. It is a partial inner surface figure (before construction of a refractory material) of the furnace wall structure of the wet furnace which concerns on this embodiment. It is sectional drawing (after refractory material construction) in the cross section perpendicular | vertical with respect to the axial direction of a surrounding wall pipe | tube of the furnace wall structure of the wet furnace which concerns on this embodiment. A cross section in a cross section perpendicular to the axial direction of the peripheral wall pipe, comparing the degree of thinning of the refractory material between the furnace wall structure of the conventional wet furnace and the furnace wall structure of the wet furnace according to one embodiment of the present invention. It is a figure and is a figure which shows the furnace wall structure of the conventional wet furnace. A cross section in a cross section perpendicular to the axial direction of the peripheral wall pipe, comparing the degree of thinning of the refractory material between the furnace wall structure of the conventional wet furnace and the furnace wall structure of the wet furnace according to one embodiment of the present invention. It is a figure and is a figure which shows the furnace wall structure of the wet furnace which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of a furnace wall structure of a wet furnace according to the present invention will be described with reference to the drawings.

Hereinafter, a furnace wall structure of a wet furnace according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3B.
FIG. 1 is a schematic configuration diagram of a combined coal gasification combined power generation facility to which a furnace wall structure of a wet furnace according to the present embodiment is applied.

An integrated coal gasification combined power generation facility (IGCC) 10 to which the gasifier facility 14 according to the present embodiment is applied uses air as an oxidant, and the gasifier facility 14 uses fuel as fuel. An air combustion system that generates combustible gas (product gas) is adopted. The coal gasification combined power generation facility 10 generates power by generating gas generated in the gasification furnace facility 14 by refining it in the gas purification facility 16 and then supplying it to the gas turbine 17. That is, the coal gasification combined power generation facility 10 of the present embodiment is an air combustion type (air blowing) power generation facility. As the fuel supplied to the gasifier facility 14, for example, a carbon-containing solid fuel such as coal is used.

As shown in FIG. 1, a coal gasification combined power generation facility (gasification combined power generation facility) 10 includes a coal supply facility 11, a gasification furnace facility 14, a char recovery facility 15, a gas purification facility 16, and a gas turbine. 17, a steam turbine 18, a power generator 19, and a heat recovery steam generator (HRSG) 20.

The coal supply facility 11 is supplied with coal, which is a carbon-containing solid fuel, as raw coal, and pulverizes the coal with a coal mill (not shown) to produce pulverized coal pulverized into fine particles. The pulverized coal produced in the coal supply facility 11 is pressurized by nitrogen gas as a transfer inert gas supplied from an air separation facility 42 to be described later at the outlet of the coal supply line 11a, toward the gasifier facility 14. Supplied. The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and representative examples thereof include nitrogen gas, carbon dioxide gas, and argon gas, but are not necessarily limited to about 5% or less.

The gasifier facility 14 is supplied with pulverized coal produced by the coal supply facility 11 and supplied with char returned (unreacted coal and ash) recovered by the char recovery facility 15 so that it can be reused. Has been.

A compressed air supply line 41 from the gas turbine 17 (compressor 61) is connected to the gasifier furnace 14, and a part of the compressed air compressed by the gas turbine 17 is boosted to a predetermined pressure by the booster 68. The gasification furnace 14 can be supplied. The air separation facility 42 separates and generates nitrogen and oxygen from air in the atmosphere, and the air separation facility 42 and the gasifier facility 14 are connected by a first nitrogen supply line 43. A coal supply line 11 a from the coal supply facility 11 is connected to the first nitrogen supply line 43. A second nitrogen supply line 45 branched from the first nitrogen supply line 43 is also connected to the gasifier facility 14, and a char return line 46 from the char recovery facility 15 is connected to the second nitrogen supply line 45. ing. The air separation facility 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. Nitrogen separated by the air separation facility 42 is used as coal or char transport gas by flowing through the first nitrogen supply line 43 and the second nitrogen supply line 45. The oxygen separated by the air separation facility 42 is used as an oxidant in the gasifier facility 14 by flowing through the oxygen supply line 47 and the compressed air supply line 41.

The gasification furnace facility 14 includes, for example, a two-stage spouted bed type gasification furnace 101 (see FIG. 2). The gasifier facility 14 gasifies the coal (pulverized coal) and char supplied therein by partially combusting them with an oxidizing agent (air, oxygen) to produce a product gas. The gasifier equipment 14 is provided with a foreign matter removing equipment 48 for removing foreign matter (slag) mixed in the pulverized coal. The gasification furnace facility 14 is connected to a gas generation line 49 for supplying a generated gas toward the char recovery facility 15 so that the generated gas containing char can be discharged. In this case, as shown in FIG. 2, a syngas cooler 102 (gas cooler) may be provided in the gas generation line 49 to cool the generated gas to a predetermined temperature before supplying it to the char recovery facility 15.

The char collection facility 15 includes a dust collection facility 51 and a supply hopper 52. In this case, the dust collection facility 51 is configured by one or a plurality of cyclones or porous filters, and can separate the char contained in the product gas generated by the gasification furnace facility 14. The product gas from which the char has been separated is sent to the gas purification facility 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the generated gas by the dust collection equipment 51. A bin may be disposed between the dust collection facility 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification facility 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the product gas from which the char has been separated by the char recovery facility 15. The gas purification facility 16 purifies the generated gas to produce fuel gas, and supplies it to the gas turbine 17. Since the product gas from which the char has been separated still contains a sulfur content (H ₂ S or the like), the gas purification equipment 16 removes and recovers the sulfur content with an amine absorption liquid or the like for effective use.

The gas turbine 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. A compressed air supply line 65 from the compressor 61 is connected to the combustor 62, a fuel gas supply line 66 from the gas purification facility 16 is connected, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Has been. The gas turbine 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasification furnace facility 14, and a booster 68 is provided in the middle. Accordingly, the combustor 62 generates combustion gas by mixing and combusting a part of the compressed air supplied from the compressor 61 and at least a part of the fuel gas supplied from the gas purification facility 16. The generated combustion gas is supplied to the turbine 63. The turbine 63 rotates the generator 19 by rotating the rotating shaft 64 with the supplied combustion gas.

The steam turbine 18 includes a turbine 69 connected to the rotating shaft 64 of the gas turbine 17, and the generator 19 is connected to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is connected to an exhaust gas line 70 from the gas turbine 17 (the turbine 63), and generates steam by exchanging heat between the water supply and the exhaust gas of the turbine 63. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 and a steam recovery line 72 between the steam turbine 18 and the turbine 69, and a condenser 73 is provided in the steam recovery line 72. The steam generated in the exhaust heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the syngas cooler 102 of the gasification furnace 101. Therefore, in the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotationally driven by rotating the rotating shaft 64.

A gas purification facility 74 is provided from the outlet of the exhaust heat recovery boiler 20 to the chimney 75.

The operation of the coal gasification combined cycle facility 10 of this embodiment will be described.

In the coal gasification combined power generation facility 10 of the present embodiment, when raw coal (coal) is supplied to the coal supply facility 11, the coal is pulverized by being pulverized into fine particles in the coal supply facility 11. . The pulverized coal produced in the coal supply facility 11 is supplied to the gasifier facility 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separation facility 42. The char recovered by the char recovery facility 15 to be described later is supplied to the gasifier facility 14 through the second nitrogen supply line 45 by nitrogen supplied from the air separation facility 42. Compressed air extracted from a gas turbine 17 described later is boosted by a booster 68 and then supplied to the gasifier facility 14 through the compressed air supply line 41 together with oxygen supplied from the air separation facility 42.

In the gasification furnace facility 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate product gas. This generated gas is discharged from the gasifier facility 14 through the gas generation line 49 and sent to the char recovery facility 15.

In the char collection facility 15, the generated gas is supplied to the dust collection facility 51, whereby the fine char contained in the generated gas is separated. The product gas from which the char has been separated is sent to the gas purification facility 16 through the gas discharge line 53. On the other hand, the fine char separated from the product gas is deposited in the supply hopper 52, returned to the gasifier facility 14 through the char return line 46, and recycled.

The produced gas from which the char has been separated by the char recovery facility 15 is gas purified by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification facility 16 to produce fuel gas. The compressor 61 generates compressed air and supplies it to the combustor 62. The combustor 62 mixes the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas refining facility 16 and combusts to generate combustion gas. By rotating the turbine 63 with this combustion gas, the compressor 61 and the generator 19 are rotationally driven via the rotating shaft 64. In this way, the gas turbine 17 can generate power.

The exhaust heat recovery boiler 20 generates steam by performing heat exchange between the exhaust gas discharged from the turbine 63 and the feed water in the gas turbine 17, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, whereby the generator 19 can be rotationally driven via the rotating shaft 64 to generate electric power. The gas turbine 17 and the steam turbine 18 do not have to rotate and drive one generator 19 as the same axis, and may rotate and drive a plurality of generators as different axes.

Thereafter, in the gas purification equipment 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is released from the chimney 75 to the atmosphere.

Next, with reference to FIG. 1 and FIG. 2, the gasification furnace facility 14 in the coal gasification combined power generation facility 10 described above will be described in detail. FIG. 2 is a schematic configuration diagram showing the gasifier facility of FIG.

As shown in FIG. 2, the gasifier facility 14 includes a gasifier 101 and a syngas cooler 102.

The gasification furnace 101 is formed so as to extend in the vertical direction. Pulverized coal and oxygen are supplied to the lower side in the vertical direction, and the product gas gasified by partial combustion is directed from the lower side in the vertical direction toward the upper side. Are in circulation. The gasification furnace 101 includes a pressure vessel 110 and a gasification furnace wall (furnace wall) 111 provided inside the pressure vessel 110. In the gasification furnace 101, an annulus portion 115 is formed in a space between the pressure vessel 110 and the gasification furnace wall 111. In the space inside the gasification furnace wall 111, the gasification furnace 101 forms a combustor part 116, a diffuser part 117, and a reductor part 118 in order from the lower side in the vertical direction (that is, the upstream side in the flow direction of the product gas). doing.

The pressure vessel 110 is formed in a cylindrical shape having a hollow space inside, a gas discharge port 121 is formed at the upper end portion, and a slag hopper 122 is formed at the lower end portion (bottom portion). The gasification furnace wall 111 is formed in a cylindrical shape whose inside is a hollow space, and the wall surface thereof is provided to face the inner surface of the pressure vessel 110. In this embodiment, the pressure vessel 110 has a cylindrical shape, and the diffuser portion 117 of the gasification furnace wall 111 is also formed in a cylindrical shape. The gasification furnace wall 111 is connected to the inner surface of the pressure vessel 110 by a support member (not shown).

The gasification furnace wall 111 separates the inside of the pressure vessel 110 into an internal space 154 and an external space 156. As will be described later, the gasification furnace wall 111 has a cross-sectional shape that changes in a diffuser portion 117 between the combustor portion 116 and the reductor portion 118. The upper end portion of the gasification furnace wall 111 on the vertically upper side is connected to the gas discharge port 121 of the pressure vessel 110, and the lower end portion on the vertically lower side is provided with a gap from the bottom portion of the pressure vessel 110. ing. The slag hopper 122 formed at the bottom of the pressure vessel 110 stores stored water. The lower end of the gasification furnace wall 111 is immersed in the stored water, thereby sealing the inside and outside of the gasification furnace wall 111. ing. Burners 126 and 127 are inserted into the gasification furnace wall 111, and the syngas cooler 102 is disposed in the internal space 154. The structure of the gasification furnace wall 111 will be described later.

The annulus 115 is a space formed inside the pressure vessel 110 and outside the gasification furnace wall 111, that is, an external space 156. Nitrogen, which is an inert gas separated by the air separation equipment 42, is not shown in the figure. Supplied through the supply line. For this reason, the annulus portion 115 becomes a space filled with nitrogen. In the vicinity of the upper portion of the annulus portion 115 in the vertical direction, an in-furnace pressure equalizing pipe (not shown) for equalizing the pressure in the gasification furnace 101 is provided. The pressure equalizing pipe in the furnace is provided so as to communicate between the inside and outside of the gasification furnace wall 111, and the pressure between the inside (combustor part 116, diffuser part 117 and reductor part 118) and outside (annulus part 115) of the gasification furnace wall 111. The pressure is almost equalized so that the difference is within a predetermined pressure.

The combustor unit 116 is a space for partially burning pulverized coal, char, and air, and a combustion apparatus including a plurality of burners 126 is disposed on the gasification furnace wall 111 in the combustor unit 116. The high-temperature combustion gas obtained by burning part of the pulverized coal and char in the combustor unit 116 passes through the diffuser unit 117 and flows into the reductor unit 118.

The reductor unit 118 is maintained at a high temperature necessary for the gasification reaction, and supplies the pulverized coal to the combustion gas from the combustor unit 116 to partially burn the pulverized coal (for example, carbon monoxide, hydrogen, lower hydrocarbons, etc.). And a gasification furnace wall 111 in the reductor unit 118 is provided with a combustion device composed of a plurality of burners 127.

The syngas cooler 102 is provided inside the gasification furnace wall 111 and is provided above the burner 127 of the reductor unit 118 in the vertical direction. The syngas cooler 102 is a heat exchanger, and in order from the lower side in the vertical direction of the gasification furnace wall 111 (upstream side in the flow direction of the product gas), an evaporator 131, a superheater (superheater) 132, A charcoal unit (economizer) 134 is arranged. These syngas coolers 102 cool the generated gas by exchanging heat with the generated gas generated in the reductor unit 118. The quantity of the evaporator (evaporator) 131, the superheater (superheater) 132, and the economizer (economizer) 134 is not limited.

Operation | movement of the above-mentioned gasifier furnace 14 is demonstrated.
In the gasification furnace 101 of the gasification furnace facility 14, nitrogen and pulverized coal are supplied and ignited by the burner 127 of the reductor unit 118, and pulverized coal and char and compressed air (oxygen) are generated by the burner 126 of the combustor unit 116. It is turned on and ignited. Then, in the combustor unit 116, high-temperature combustion gas is generated by the combustion of pulverized coal and char. In the combustor unit 116, molten slag is generated in the high-temperature gas by the combustion of pulverized coal and char, and this molten slag adheres to the gasification furnace wall 111 and falls to the furnace bottom, and finally the water stored in the slag hopper 122 is stored. Is discharged. The high-temperature combustion gas generated in the combustor unit 116 rises to the reductor unit 118 through the diffuser unit 117. In this reductor unit 118, the high temperature state necessary for the gasification reaction is maintained, the pulverized coal is mixed with the high temperature combustion gas, the pulverized coal is partially burned in a high temperature reducing atmosphere, and the gasification reaction is performed. Is generated. The gasified product gas flows from the lower side to the upper side in the vertical direction.

Next, the furnace wall structure of the wet furnace according to the present embodiment will be described.
3A and 3B are views showing a furnace wall structure of a wet furnace according to the present embodiment. The furnace wall structure of the wet furnace according to this embodiment is applied to the gasification furnace wall 111 of FIG.

FIG. 3A is a partial inner view (before refractory material construction) of the furnace wall structure of the wet furnace according to the present embodiment. As shown in FIG. 3A, the furnace wall structure 161 of the wet furnace according to this embodiment includes a peripheral wall tube 162 that constitutes a gasification furnace wall (furnace wall) 111 of the gasification furnace (wet furnace) 101. A plurality of studs 163 are juxtaposed along the axial direction of the peripheral wall tube 162 so as to extend in the radial direction from the center of the peripheral wall tube 162 with a constant interval on the side surface of the peripheral wall tube 162. Yes. The stud 163 is provided by welding on the surface of the peripheral wall tube 162. The peripheral wall pipes 162 are connected to each other by fins 164.

The stud 163 is provided on the fin portion 166 on the fin 164 side with respect to the crown portion 165 on the furnace inner surface of the peripheral wall tube 162 or on the crown inner portion 165 of the peripheral wall tube 162 on the furnace inner surface. As shown in FIG. 3A, the studs 163 are alternately provided in the order of one on the crown portion 165 and two on the fin portion 166 (so as to straddle the crown portion 165) along the axial direction of the peripheral wall tube 162. .

FIG. 3B is a cross-sectional view (after refractory material construction) in a cross section perpendicular to the axial direction of the peripheral wall pipe of the furnace wall structure of the wet furnace according to the present embodiment. As shown in FIG. 3B, a refractory material 167 is provided so as to embed a stud 163 in the furnace inner surface of the furnace wall structure 161 of the wet furnace.

As shown in FIG. 3B, the studs 163 that are farthest from each other on any plane perpendicular to the axial direction of the peripheral wall tube 162 are provided in an angular range of 50 to 140 ° around the center of the peripheral wall tube 162. (An angle A indicated by a double-headed arrow in FIG. 3B). When the angle A is around 100 °, the thickness of the refractory material 167 in the fin portion 166 is maximized. In the present invention, the angle A may be 50 to 140 °, preferably 60 to 130 °.

Next, FIG. 4A and FIG. 4B are shown and the reduction effect of the thinning of the refractory material by the furnace wall structure of the wet furnace which concerns on this embodiment is demonstrated. 4A and 4B show a comparison of the degree of thinning of the refractory material between the furnace wall structure of the conventional wet furnace and the furnace wall structure of the wet furnace according to the present embodiment, and is perpendicular to the axial direction of the peripheral wall pipe. It is sectional drawing in a cross section. FIG. 4A shows a furnace wall structure of a conventional wet furnace, and FIG. 4B shows a furnace wall structure of a wet furnace according to this embodiment. In the furnace wall structure 261 of the conventional wet furnace shown in FIG. 4A, the two studs 263 that are farthest from each other in any plane perpendicular to the axial direction of the peripheral wall pipe 262 are around the center of the peripheral wall pipe 262. It is provided in an angle range of less than 50 °.

As a result of operating a wet furnace to which the conventional furnace wall structure 261 of the wet furnace and a wet furnace to which the furnace wall structure 161 of the wet furnace according to the present embodiment is applied, these furnace wall structures are shown in FIGS. 4A and 4B, respectively. It became a state as shown in.

The thickness of the refractory material in the crown was compared. As shown in FIGS. 4A and 4B, the thickness of the refractory material 267 applied to the crown portion 265 in the furnace wall structure 261 of the conventional wet furnace and the crown portion 165 in the furnace wall structure 161 of the wet furnace according to the present embodiment. There was no significant difference between the thickness of the fireproof material 167 applied.

Next, the thickness of the refractory material at the fins was compared. As shown in FIG. 4A, in the furnace wall structure 261 of the conventional wet furnace, the thickness of the refractory material 267 near the fin portion 266 on the fin 264 side is remarkably reduced, and thinning of the refractory material 267 cannot be suppressed. It became clear. On the other hand, as shown in FIG. 4B, in the furnace wall structure 161 of the wet furnace according to the present embodiment, the thickness of the refractory material 167 in the vicinity of the fin portion 166 is sufficiently secured, and the thinning of the refractory material 167 can be suppressed. It became clear that.

From these results, it became clear that the thinning of the refractory material 167 in the fin portion 166 can be suppressed (thickness can be increased) by making the interval (angle) between the studs provided in the fin portion wider than before. It can be considered that the thinning of the refractory material 167 in the fin portion 166 can be suppressed because the cooling effect on the refractory material 167 in the fin portion 166 is improved. It has also been clarified that the thickness of the refractory material 167 in the crown portion 165 can be made substantially the same as the conventional thickness.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
In the furnace wall structure 161 of the wet furnace of the present embodiment, the studs 163 farthest from each other on a specific surface as described above are provided so as to have an angle range of 50 to 140 ° around the center of the peripheral wall pipe 162. Thereby, it becomes easy to hold and cool the refractory material 167 applied to the fin portion of the peripheral wall pipe 162. Thereby, the cooling effect of the refractory material 167 can be enhanced without changing the total amount (weight) of the stud 163. Thinning of the refractory material 167 due to erosion can be reduced. When the angle range is less than 50 ° or more than 140 °, the cooling effect of the refractory material 167 is insufficient, and the refractory material 167 is significantly thinned.

As described above, in the furnace wall structure 161 of the wet furnace, the plurality of studs 163 includes one stud 163 farthest from the crown 165 that protrudes most inside the furnace along the axial direction of the peripheral wall pipe 162. They are provided alternately in the order of two. If the studs 163 are arranged in this way, the peripheral wall pipe 162 (crown portion 165 and the like) can be held with a minimum number.

Since the wet furnace 101 of the present embodiment includes the furnace wall structure 161 of the above-described wet furnace, the thickness of the refractory material 167 due to erosion can be reduced. Accordingly, the wet furnace is excellent in economic efficiency and reliability.

In the above-described embodiment, coal is used as a fuel. However, it can be applied to high-grade coal and low-grade coal, and is not limited to coal, but can be used as a biomass that is used as an organic resource derived from renewable organisms. There may be. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these raw materials.

In the present embodiment, a tower type gasification furnace has been described as the gasification furnace 101. However, the gasification furnace 101 may be a crossover type gasification furnace. It can be similarly implemented by replacing the gas flow directions to match.

10 Coal gasification combined power generation facility (gasification combined power generation facility)
11 Coal supply facility 11a Coal supply line 14 Gasifier facility 15 Char recovery facility 16 Gas purification facility 17 Gas turbine 18 Steam turbine 19 Generator 20 Waste heat recovery boiler 41 Compressed air supply line 42 Air separation facility 43 First nitrogen supply line 45 Second nitrogen supply line 46 Char return line 47 Oxygen supply line 48 Foreign matter removal equipment 49 Gas generation line 51 Dust collection equipment 52 Supply hopper 53 Gas discharge line 61 Compressor 62 Combustor 63 Turbine 64 Rotating shaft 65 Compressed air supply line 66 Fuel gas supply line 67 Combustion gas supply line 68 Booster 69 Turbine 70 Exhaust gas line 71 Steam supply line 72 Steam recovery line 73 Condenser 74 Gas purification equipment 75 Chimney 101 Gasification furnace (wet furnace)
102 Syngas cooler 110 Pressure vessel 111 Gasification furnace wall (furnace wall)
115 Annulus portion 116 Combustor portion 117 Diffuser portion 118 Reductor portion 121 Gas discharge port 122 Slag hopper 126 Burner 127 Burner 131 Evaporator 132 Superheater 134 Eco-conserving device 154 Internal space 156 External space 161 Furnace furnace wall structure 162 Perimeter wall pipe 163 Stud 164 Fin 165 Crown 166 Fin 167 Refractory material A Angle

Claims (3)

A peripheral wall pipe constituting the furnace wall of the wet furnace;
A plurality of studs arranged side by side so as to extend in the radial direction from the center of the peripheral wall tube along the axial direction of the peripheral wall tube with a constant interval on the side surface of the peripheral wall tube;
With
The furnace wall structure of a wet furnace in which the studs that are farthest from each other on an arbitrary surface perpendicular to the axial direction of the peripheral wall pipe are provided in an angle range of 50 to 140 ° around the center of the peripheral wall pipe . 2. The plurality of studs are provided alternately in the order of two in the order of two studs, one on the crown portion that protrudes most to the inside of the furnace along the axial direction of the peripheral wall tube. The furnace wall structure of the described wet furnace. A wet furnace having the furnace wall structure of the wet furnace according to claim 1 or 2.

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