Furnace wall, gasification furnace, and method for producing furnace wall

Abstract

To provide a furnace wall in which corrosion is less likely to occur in a water-cooled wall even when components contained in furnace gas permeate through a refractory material.SOLUTION: A furnace wall 111 of a gasification furnace comprises: a water-cooled wall 112 having a plurality of heat transfer tubes 112a; a protective film 113 provided on a surface of the water-cooled wall 112 and having higher corrosion resistance than the water-cooled wall 112; and a protective material 114 provided on a surface of the protective film 113. The protective material 114 may contain slag generated in the gasification furnace.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a furnace wall, a gasification furnace, and a method for manufacturing a furnace wall. [Background technology]

[0002] 2. Description of the Related Art A known example of a gasification furnace is a gasification facility that supplies a carbon-containing fuel such as coal into a gasification furnace and partially combusts and gasifies the carbon-containing fuel to produce combustible gas.

[0003] The water-cooled walls of gasifier furnaces are equipped with refractory materials. However, during operation, hydrogen sulfide (H2S) and hydrogen chloride (HCl) contained in the gases inside the furnace can penetrate through gaps and cracks in the porous refractory material and reach the water-cooled walls. In this case, gas corrosion can occur in the water-cooled walls. Furthermore, hydrogen chloride can react with the metal in the water-cooled walls to produce iron chloride (FeCl2), which can cause dissolved salt corrosion in the water-cooled walls. Furthermore, when the gasifier is shut down, the iron chloride deliquesces, wetting the water-cooled walls. Water containing a high concentration of chlorine can flow down the gap (boundary) between the water-cooled walls and the refractory, causing crevice corrosion.

[0004] Although not intended for use in the furnace walls of gasification furnaces, Patent Document 1 discloses a technology for forming a coating on the surface of a refractory material attached to a metal material, thereby suppressing the penetration of gas into the refractory material and preventing corrosion of the metal material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 155588 / 1988 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of the furnace walls of a gasification furnace, even if a coating is formed on the surface of the refractory material, the coating may melt due to the high-temperature slag, allowing gas to penetrate the refractory material and causing corrosion of the metal material.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a furnace wall, a gasification furnace, and a method for manufacturing a furnace wall in which corrosion is unlikely to occur in the water-cooled wall even if components contained in the furnace gas penetrate the refractory material. [Means for solving the problem]

[0008] In order to solve the above problems, the furnace wall, gasification furnace, and furnace wall manufacturing method of the present disclosure employ the following measures. A furnace wall according to one aspect of the present disclosure is a furnace wall of a gasification furnace that gasifies a carbon-containing fuel, and includes a water-cooled wall having a plurality of heat transfer tubes, a protective film provided on the surface of the water-cooled wall and having higher corrosion resistance than the water-cooled wall, and a protective material provided on the surface of the protective film.

[0009] A gasification furnace according to one aspect of the present disclosure includes a furnace wall.

[0010] A method for manufacturing a furnace wall according to one aspect of the present disclosure is a method for manufacturing a furnace wall of a gasification furnace that gasifies a carbon-containing fuel, which includes forming a protective film on the surface of a water-cooled wall having a plurality of heat transfer tubes to prevent penetration of gas inside the furnace, and placing a protective material on the surface of the formed protective film. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide a furnace wall, a gasification furnace, and a method for manufacturing a furnace wall in which corrosion is unlikely to occur in the water-cooled wall even if components contained in the furnace gas permeate the refractory material. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic configuration diagram showing an integrated coal gasification combined cycle power generation facility according to an embodiment of the present disclosure. [Figure 2]1 is a schematic configuration diagram showing a gasification furnace according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view of the F3 portion shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Overall equipment configuration and operation] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the following explanation, "up" in terms such as "upper", "top", and "top surface" refers to the top in the vertical direction. "Down" in terms such as "lower", "bottom", and "surface" refers to the bottom in the vertical direction. The vertical direction may include an error.

[0014] First, the configuration of the integrated coal gasification combined cycle power generation facility 10 will be described.

[0015] An integrated coal gasification combined cycle (IGCC) plant 10 to which the gasifier 101 is applied is a plant in which the product gas generated in the gasifier 101 is purified in a gas purification plant 16 to become fuel gas, and then the fuel gas is supplied to a gas turbine 17 to generate electricity. The integrated coal gasification combined cycle power plant 10 uses air as the main oxidizing agent, and employs an air combustion system in which combustible gas (produced gas) is produced from fuel in the gasifier 101. In other words, the integrated coal gasification combined cycle power plant 10 is an air combustion system (air-blown) power generation facility. The fuel supplied to the gasifier 101 is exemplified by a carbon-containing fuel such as coal. In this embodiment, an air combustion type integrated coal gasification combined cycle power generation plant 10 will be described as an example, but the integrated coal gasification combined cycle power generation plant 10 may also be an oxygen combustion type (oxygen-blown) plant that uses an oxidizing agent mainly composed of oxygen.

[0016] As shown in FIG. 1, the integrated coal gasification combined cycle power generation plant 10 includes a coal supply facility 11, a gasifier 101, a char recovery facility 15, a gas purification facility 16, a gas turbine 17, a steam turbine 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

[0017] The coal supply facility 11 is a facility that produces pulverized fuel in the form of fine particles by pulverizing supplied coal using a coal mill (not shown) or the like. The pulverized fuel produced in the coal supply facility 11 is pressurized at the outlet of the coal supply line 11 a by inert gas (inert gas for transport) supplied from the air separation facility 42 described later, and is supplied to the gasification furnace 101 . An inert gas is an inert gas with an oxygen content of about 5% by volume or less, and examples thereof include nitrogen gas, carbon dioxide gas, argon gas, etc. However, the oxygen content of the inert gas is not necessarily limited to about 5% by volume or less.

[0018] The gasification furnace 101 is supplied with pulverized fuel produced in the coal supply equipment 11, as well as char (unreacted pulverized fuel and ash) as a carbon-containing fuel recovered in the char recovery equipment 15, for the purpose of energy reuse.

[0019] A compressed air supply line 41 from the gas turbine 17 (compressor 61) is connected to the gasification furnace 101, and a portion of the compressed air compressed by the gas turbine 17 is boosted to a predetermined pressure by a booster 68 before being supplied to the gasification furnace 101. The air separation facility 42 separates and produces nitrogen and oxygen from atmospheric air. The air separation equipment 42 is connected to the gasifier 101 via a first nitrogen supply line 43. A coal feed line 11a from the coal feed equipment 11 is connected to the first nitrogen supply line 43. The first nitrogen supply line 43, from the point where the first nitrogen supply line 43 is connected to the coal feed line 11a to the gasifier 101, is defined as the fuel supply line 12. A char return line 46 from the char recovery equipment 15 is connected to a second nitrogen supply line 45 that branches off from the first nitrogen supply line 43 (a point other than the fuel supply line 12) and is connected to the gasifier 101. The second nitrogen supply line 45, from the point where the char return line 46 is connected to the second nitrogen supply line 45 to the gasifier 101, is defined as the char supply line 13. The nitrogen separated by the air separation equipment 42 flows through the first nitrogen supply line 43 and the second nitrogen supply line 45, and is supplied to the gasifier 101 as a carrier gas for coal and char (carrying inert gas). The air separation equipment 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. The oxygen separated by the air separation equipment 42 flows through the oxygen supply line 47 and the compressed air supply line 41, and is supplied to the gasification furnace 101 as an oxidizing agent (air, oxygen) in the gasification furnace 101.

[0020] The gasifier 101 is a facility that gasifies pulverized fuel and char supplied therein by partially burning them with an oxidizing agent (air, oxygen) to generate generated gas. The gasifier 101 is configured, for example, as a two-stage entrained flow type. The gasifier 101 is provided with a foreign matter removal facility 48 that discharges coal, ash (coal ash), and the like to the outside. A first produced gas line 49 that supplies produced gas toward the char recovery facility 15 is connected to this gasification furnace 101, and is configured so that produced gas containing char can be discharged. As shown in Fig. 2, a syngas cooler 102 (gas cooler) may be provided inside the gasification furnace 101 (in the flow path through which the produced gas flows) to cool the produced gas to a predetermined temperature before supplying it to the char recovery facility 15. Note that a syngas cooler different from the syngas cooler 102 installed inside the gasification furnace 101 may be provided in another flow path through which the produced gas flows.

[0021] As shown in FIG. 1, the char recovery facility 15 includes a dust collector 51 and a supply hopper 52. The dust collector 51 is configured with one or more cyclones or porous filters, and is a device that separates char contained in the product gas generated in the gasifier 101. The product gas from which char has been separated is sent from the dust collector 51 to the gas purification equipment 16 through a second product gas line 53. The supply hopper 52 is a device that stores the char separated from the generated gas by the dust collector 51. A char return line 46 connected to the supply hopper 52 is connected to the second nitrogen supply line 45. A bin may be provided between the dust collector 51 and the supply hopper 52, and multiple supply hoppers 52 may be connected to this bin.

[0022] The gas purification equipment 16 is an equipment for purifying gas by removing impurities such as sulfur compounds and nitrogen compounds from the generated gas from which the char has been separated by the char recovery equipment 15 . The gas purification equipment 16 supplies the fuel gas to a gas turbine 17. Since the product gas from which the char has been separated contains sulfur compounds (such as H2S), the gas purification equipment 16 removes and recovers the sulfur compounds using an amine absorption solution or the like, and uses the recovered sulfur compounds as gypsum or the like.

[0023] The gas turbine 17 includes a compressor 61 , a combustor 62 , and a turbine 63 . The compressor 61 and the turbine 63 are connected by a rotary shaft 64 . The combustor 62 is connected to a compressed air supply line 65 connected to the compressor 61, a fuel gas supply line 66 connected to the gas purification equipment 16, and a combustion gas supply line 67 connected to the turbine 63. The compressor 61 is connected to a compressed air supply line 41 which is connected to the gasification furnace 101. A booster 68 is provided midway along the compressed air supply line 41. The combustor 62 is a device that generates combustion gas by mixing and burning a portion of the compressed air supplied from the compressor 61 with at least a portion of the fuel gas supplied from the gas purification facility 16. The combustion gas generated in the combustor 62 is supplied to the turbine 63 via a combustion gas supply line 67. The turbine 63 rotates a rotary shaft 64 by the supplied combustion gas, thereby driving the generator 19 to rotate.

[0024] The steam turbine 18 includes a turbine 69 connected to a rotary shaft 64. The generator 19 is connected to this rotary shaft 64. Note that the steam turbine 18 and the gas turbine 17 do not have to drive and rotate one generator 19 on the same shaft, and multiple generators 19 may be driven and rotated on different shafts. The heat recovery boiler 20 is a facility that generates steam by exchanging heat between water supplied to the heat recovery boiler 20 and exhaust gas from a turbine 63. An exhaust gas line 70 that is connected to the gas turbine 17 (turbine 63) is connected to the heat recovery boiler 20, and is configured to be supplied with exhaust gas from the turbine 63.

[0025] A steam supply line 71 and a water supply line 72 are provided between the heat recovery steam generator 20 and the turbine 69 of the steam turbine 18. A condenser 73 is provided on the water supply line 72. The turbine 69 of the steam turbine 18 is rotationally driven by steam supplied from the heat recovery boiler 20, and rotates the rotary shaft 64, thereby rotating the generator 19. The steam generated in the heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the syngas cooler 102 of the gasifier 101. An exhaust gas purification system 74 is provided between the outlet of the heat recovery steam generator 20 and the chimney 75 .

[0026] Next, the operation of the integrated coal gasification combined cycle power generation plant 10 will be described.

[0027] When raw coal (coal) is supplied to the coal supply facility 11, the coal is pulverized into fine particles to become pulverized fuel. The pulverized fuel produced in the coal supply facility 11 is supplied to the gasifier 101 through the fuel supply line 12 by nitrogen supplied from the air separation facility 42 through the first nitrogen supply line 43 .

[0028] The char recovered in the char recovery facility 15 is supplied to the gasification furnace 101 through the char supply line 13 by nitrogen supplied from the air separation facility 42 through the second nitrogen supply line 45 . The compressed air extracted from the compressor 61 of the gas turbine 17 is pressurized in a booster 68, and then flows through the compressed air supply line 41 together with oxygen supplied from the air separation equipment 42 and supplied to the gasification furnace 101.

[0029] In the gasifier 101, the supplied pulverized fuel and char are combusted with compressed air (oxygen) and gasified to generate a generated gas. The generated gas flows from the gasifier 101 through a first generated gas line 49 and is supplied to the char recovery facility 15.

[0030] The generated gas is first supplied to the dust collector 51 of the char recovery facility 15, where the fine char particles contained therein are separated. The product gas from which the char has been separated flows through a second product gas line 53 and is supplied to the gas purification facility 16. Meanwhile, the char separated from the product gas is stored in a supply hopper 52 and returned to the gasifier 101 via a char return line 46 for recycling.

[0031] The produced gas supplied to the gas purification equipment 16 is purified by removing impurities such as sulfur compounds and nitrogen compounds (the purified produced gas is called fuel gas). The compressed air compressed by the compressor 61 is supplied to the combustor 62. The combustor 62 generates combustion gas by mixing a portion of the compressed air supplied from the compressor 61 with at least a portion of the fuel gas supplied from the gas purification facility 16 and burning the mixture. This combustion gas drives a turbine 63 to rotate, which in turn drives the compressor 61 and the generator 19 via a rotary shaft 64. In this way, the gas turbine 17 generates electricity.

[0032] The heat recovery steam generator 20 generates steam by exchanging heat between the exhaust gas discharged from a turbine 63 of the gas turbine 17 and water supplied to the heat recovery steam generator 20. The generated steam is supplied to a turbine 69 of the steam turbine 18. The turbine 69 is rotationally driven by the supplied steam, and rotates the generator 19 via a rotary shaft 64.

[0033] The exhaust gas purification equipment 74 removes harmful substances from the exhaust gas discharged from the heat recovery boiler 20, and the purified exhaust gas is released into the atmosphere through a chimney 75.

[0034] Next, the detailed configuration of the gasification furnace 101 will be described.

[0035] As shown in FIG. 2, the gasification furnace 101 includes a pressure vessel 110 extending in the vertical direction, and a gasification furnace wall (furnace wall) 111 provided inside the pressure vessel 110. Pulverized fuel and oxygen are supplied to the lower part of the gasifier 101, and the pulverized fuel is partially combusted and gasified, producing gas that flows from the bottom to the top.

[0036] An annulus 115 is formed in the space between the pressure vessel 110 and the gasifier wall 111 . In the space within the gasification furnace wall 111, a combustor section 116, a diffuser section 117, and a reductor section 118 are formed in this order from the bottom (upstream in the flow direction of the generated gas).

[0037] The pressure vessel 110 is formed in a hollow cylindrical shape, and is provided with a gas discharge port 121 at the upper end and a slag hopper 122 at the lower end (bottom).

[0038] The gasifier wall 111 is formed in a hollow cylindrical shape, and its outer wall surface faces the inner wall surface of the pressure vessel 110 . The gasifier wall 111 separates the interior of the pressure vessel 110 into an inner space and an outer space (annulus portion 115). The cross-sectional shape of the gasifier wall 111 (the cross-sectional shape on a cut surface perpendicular to the vertical direction) changes in the diffuser section 117 between the combustor section 116 and the reductor section 118. The upper end of the gasification furnace wall 111 is connected to the gas outlet 121 of the pressure vessel 110, and the lower end is provided so as to be spaced apart from the bottom surface of the pressure vessel 110. Water is stored in a slag hopper 122 formed at the bottom of the pressure vessel 110, and the lower end of the gasification furnace wall 111 is immersed in the water, thereby sealing the inside and outside of the gasification furnace wall 111. Various burners are inserted into the gasifier wall 111, and a syngas cooler 102 is disposed in the internal space of the gasifier wall 111.

[0039] The annulus 115 is a space formed between the pressure vessel 110 and the gasifier wall 111. For example, nitrogen, which is an inert gas separated in the air separation equipment 42, is supplied to the annulus 115 via a nitrogen supply line (not shown). Therefore, the annulus 115 becomes a space filled with nitrogen. An in-furnace pressure equalizing pipe (not shown) is provided near the top of the annulus 115. The in-furnace pressure equalizing pipe connects the inside and outside of the gasifier wall 111, and keeps the pressure difference between the internal space (combustor section 116, diffuser section 117, and reductor section 118) and the external space (annulus 115) within a predetermined pressure range.

[0040] A combustion device having, from top to bottom, a plurality of char burners 125 and a plurality of combustor-type pulverized coal burners 126 is provided on the gasification furnace wall 111 surrounding the combustor section 116 (the gasification furnace wall 111 defining the combustor section 116). In the startup combustion chamber below the combustor section 116, a combustion device having, from top to bottom, a plurality of slag melting burners 128, an ignition torch 129, and a light oil burner 130 is arranged.

[0041] The slag melting burner 128 is a burner for melting the solidified slag that has been produced. The plurality of ignition torches 129 and the light oil burner 130 are burners used to start up the gasifier 101 . High-temperature combustion gas obtained by burning the pulverized fuel and a portion of the char in the combustor section 116 passes through the diffuser section 117 and flows into the reductor section 118 .

[0042] The reductor section 118 is a space that is maintained at a high temperature required for the gasification reaction, and supplies pulverized fuel to the combustion gas flowing in from the combustor section 116, causing partial combustion, and gasifying and decomposing the pulverized fuel to produce a product gas that is a volatile component (carbon monoxide, hydrogen, lower hydrocarbons, etc.). A combustion device having a plurality of reductor-based pulverized coal burners 127 is disposed on the gasifier wall 111 surrounding the reductor section 118 (the gasifier wall 111 defining the reductor section 118).

[0043] The syngas cooler 102 is provided above the reductor-system pulverized coal burners 127 inside the gasifier wall 111 (inside the internal space). The syngas cooler 102 is a heat exchanger and includes an evaporator 131, a superheater 132, and an economizer 134, which are arranged in this order from the bottom (upstream in the flow direction of the produced gas). The syngas cooler 102 exchanges heat with the product gas generated in the reductor section 118 to cool the product gas. The number and arrangement of the evaporator 131, the superheater 132, and the economizer 134 are not limited to those shown in the figure.

[0044] Next, the operation of the gasification furnace 101 will be described.

[0045] Oxidizer and fuel are supplied and ignited from a plurality of ignition torches 129 and a diesel burner 130 . This generates high-temperature combustion gas in the startup combustion chamber, and the combustor section 116 is heated to a predetermined temperature at which pulverized fuel and char can be combusted.

[0046] Pulverized fuel, char, and compressed air (oxygen) are introduced and ignited from the char burner 125 of the combustor section 116 and the combustor-based pulverized coal burner 126. In addition, pulverized fuel and nitrogen are introduced and ignited from the reductor-based pulverized coal burner 127. Then, high-temperature combustion gas is generated by the combustion of the pulverized fuel and char in the combustor section 116. Also, in the combustor section 116, the ash contained in the fuel melts in the high-temperature gas due to the combustion of the pulverized fuel and char, producing slag. The molten slag flows down the gasifier wall 111, passes through slag hole H provided at the bottom of the combustor section 116, and is finally discharged into the water stored in the slag hopper 122.

[0047] High-temperature combustion gas generated in the combustor section 116 flows into the reductor section 118 through the diffuser section 117 . The reductor section 118 is maintained at a high temperature required for the gasification reaction, and the pulverized fuel mixes with the high-temperature combustion gas. The pulverized fuel is partially combusted in a high-temperature reducing atmosphere, and the gasification reaction occurs, producing a product gas that flows from bottom to top. The pulverized fuel and char are ignited, the gasification reaction is initiated, and stable operation is ensured by the self-ignition of the pulverized fuel and char, after which the ignition torch 129 and the light oil burner 130 are extinguished.

[0048] [Details of the furnace wall] As shown in FIG. 3, the gasifier wall 111 includes a water-cooled wall 112, a protective film 113, and a protective material 114.

[0049] The water-cooled wall 112 has a plurality of heat transfer tubes 112a and a plurality of holders 112b.

[0050] Each heat transfer tube 112a is a pipe extending in the vertical direction. The heat transfer tubes 112a are arranged in parallel around an axis extending in the vertical direction, and each heat transfer tube 112a is connected to each other by connecting fins (not shown), thereby forming a water-cooled wall 112 formed in a hollow cylindrical shape. In order to cool the gasification furnace wall 111 (to protect the gasification furnace wall 111 from heat), water is supplied to each heat transfer tube 112a from the bottom. The supplied water is heated by exchanging heat with the furnace gas (gas present in the furnace, such as combustion gas and generated gas) while flowing through the heat transfer tubes 112a. In other words, the water-cooled wall 112 also functions as a heat exchanger. The water heated by the water wall 112 is supplied to, for example, an economizer 134 of the syngas cooler 102 .

[0051] The holder 112b is a member for holding the protective material 114, and is, for example, a stud protruding from the surface of the heat transfer tube 112a toward the inside of the gasification furnace 101. The shape of the holder 112b is not limited to the shape of the holder 112b shown in the drawing. Also, the holder 112b does not necessarily have to be provided on the surface of the heat transfer tube 112a.

[0052] The protective film 113 is a thin film (thickness: approximately 300 μm to 900 μm) provided on the surface of the water-cooled wall 112. The surface of the water-cooled wall 112 is the surface of the water-cooled wall 112 that would be exposed to the inside (internal space) of the gasifier wall 111 if the protective film 113 and the protective material 114 were not present. Therefore, the surface of the water-cooled wall 112 is any one of the surfaces of the heat transfer tubes 112a, the connecting fins (not shown), and the holders 112b. The protective film 113 is a film that is more corrosion-resistant (a film with excellent corrosion resistance) than the water-cooled wall 112, and has the function of protecting the water-cooled wall 112 from components of the furnace gas (H2S, HCl, etc.) that have permeated the protective material 114, thereby making it less likely for corrosion to occur in the water-cooled wall 112. The protective film 113 is a thermal sprayed film applied by thermal spraying, for example, but the application method of the protective film 113 is not limited to thermal spraying. Due to its role of protecting the water-cooled wall 112, the protective film 113 is preferably subjected to a treatment to prevent or reduce the penetration of furnace gas (for example, a sealing treatment if the protective film 113 is a thermally sprayed film). Nickel-based metals are exemplified as materials for the protective film 113. However, the material for the protective film 113 is not limited to nickel-based metals as long as it has better corrosion resistance than the water-cooled wall 112.

[0053] The protective material 114 is a member provided on the surface of the protective film 113. The surface of the protective film 113 is the surface of the protective film 113 that would be exposed to the inside (internal space) of the gasifier wall 111 if the protective material 114 were not present. The protective material 114 is held on the water-cooled wall 112 by a holder 112b having a protective film 113 formed on its surface. The protective material 114 is a member having excellent heat resistance, and has the function of protecting the water-cooled wall 112 from the heat of the gas inside the furnace. The surface of the protective material 114 is exposed to the inside (internal space) of the gasification furnace wall 111, for example.

[0054] The protective material 114 is a refractory material before the gasifier 101 is operated or in the initial stage of operation. An example of the material for the refractory material is silicon carbide (SiC). The refractory material is porous and may have voids or cracks. As time passes after the gasifier 101 starts operating, slag (molten slag) is generated in the combustor section 116, and the molten slag flows down along the surface of the refractory material serving as the protective material 114. The molten slag has a high temperature of, for example, 1250°C to 1350°C, and melts the refractory material 114. Over time, the molten slag penetrates into or corrodes the protective material 114, becoming integrated with the protective material 114, and the refractory material is gradually replaced by a slag layer. Therefore, the protective material 114 is a refractory material and / or a slag layer. Specifically, the protective material 114 is a refractory material before the gasifier 101 starts operating or in the initial stage of operation, and after the gasifier 101 starts operating and time has passed, the protective material 114 becomes a slag layer or a mixture of the refractory material and the slag layer.

[0055] [Gasification furnace wall manufacturing method] The gasifier wall 111 configured as above is manufactured as follows. First, the protective film 113 is formed on the surface of the water-cooled wall 112. The protective film 113 is applied to the surface of the water-cooled wall 112 by, for example, thermal spraying. Next, a fireproof material serving as the protective material 114 is placed on the surface of the protective film 113. At this time, the protective material 114 is held on the water-cooled wall 112 by a holder 112b having the protective film 113 formed on its surface.

[0056] The protective film 113 and the protective material 114 are applied to the area of ​​the gasifier wall 111 corresponding to the area where the combustion of the pulverized fuel and char or the gasification reaction of the pulverized fuel takes place or the area that comes into contact with the high-temperature produced gas. As a specific example, the protective film 113 and the protective material 114 are applied to the area of ​​the gasifier wall 111 corresponding to the combustor section 116, the diffuser section 117, and the reductor section 118. The combustor section 116, the diffuser section 117, and the reductor section 118 are spaces within the gasification furnace wall 111 that are subject to particularly high temperatures and pressures, and the protective material 114 is prone to deterioration, and the gas inside the furnace is prone to permeate the protective material 114. The protective film 113 and the protective material 114 may be applied to areas other than those mentioned above.

[0057] [effect] According to this embodiment, the following effects are achieved.

[0058] The gasification furnace wall 111 is provided with a protective film 113 that is provided on the surface of the water-cooled wall 112 and has higher corrosion resistance than the water-cooled wall 112, and a protective material 114 that is provided on the surface of the protective film 113.Therefore, even if components such as hydrogen sulfide and hydrogen chloride contained in the furnace gas penetrate through gaps and cracks in the protective material 114, the water-cooled wall 112 is protected by the highly corrosion-resistant protective film 113, making it less likely for corrosion to occur in the water-cooled wall 112. Furthermore, since the protective film 113 is provided on the surface of the water-cooled wall 112, i.e., the protective film 113 is in contact with the water-cooled wall 112, even if the protective material 114 deteriorates, the cooling action of the water-cooled wall 112 makes the protective film 113 less likely to deteriorate due to the heat of the furnace gas.

[0059] Furthermore, since the material of the protective film 113 is a nickel-based metal, the protective film 113 can be formed with excellent corrosion resistance.

[0060] Furthermore, when the protective film 113 is provided in an area corresponding to the area where the combustion or gasification reaction takes place or the area that comes into contact with the generated gas, the protective film 113 can protect the area that is in a high-temperature, high-pressure environment where corrosion is particularly likely to occur.

[0061] [Note] The furnace wall and the method for manufacturing the furnace wall according to the embodiment described above can be understood, for example, as follows.

[0062] The furnace wall (111) according to the first aspect of the present disclosure is a furnace wall (111) of a gasification furnace (101) that gasifies a carbon-containing fuel, and includes a water-cooled wall (112) having a plurality of heat transfer tubes (112a), a protective film (113) provided on the surface of the water-cooled wall (112) and having higher corrosion resistance than the water-cooled wall (112), and a protective material (114) provided on the surface of the protective film (113).

[0063] The furnace includes a water-cooled wall (112) having a plurality of heat transfer tubes (112a), a protective film (113) provided on the surface of the water-cooled wall (112) and having higher corrosion resistance than the water-cooled wall (112), and a protective material (114) provided on the surface of the protective film (113). Therefore, even if components such as hydrogen sulfide and hydrogen chloride contained in the furnace gas penetrate through gaps or cracks in the protective material (114), the water-cooled wall (112) is protected by the highly corrosion-resistant protective film (113), and corrosion of the water-cooled wall (112) is unlikely to occur. Furthermore, since the protective film (113) is provided on the surface of the water-cooled wall (112), i.e., the protective film (113) is in contact with the water-cooled wall (112), even if the protective material (114) deteriorates, the cooling action of the water-cooled wall (112) makes the protective film (113) less susceptible to deterioration due to the heat of the furnace gas.

[0064] In a furnace wall (111) according to a second aspect of the present disclosure, in the first aspect, the protective material (114) includes slag produced in the gasification furnace (101).

[0065] The protective material (114) that was in place prior to operation may replace the slag.

[0066] In the furnace wall (111) according to a third aspect of the present disclosure, in the first or second aspect, the material of the protective film (113) is a nickel-based metal.

[0067] The material of the protective film (113) is a nickel-based metal, so that the protective film (113) can be formed with excellent corrosion resistance.

[0068] In a furnace wall (111) according to a fourth aspect of the present disclosure, in any one of the first to third aspects, the protective film (113) is provided in an area where a combustion or gasification reaction of a carbon-containing fuel takes place or an area that comes into contact with a generated gas.

[0069] The protective film (113) is provided in the area where the combustion or gasification reaction takes place or in the area where the generated gas is exposed, and therefore the protective film (113) can protect the area that is in a high-temperature, high-pressure environment where corrosion is particularly likely to occur.

[0070] A gasification furnace (101) according to a fifth aspect of the present disclosure includes the furnace wall (111) according to any one of the first to fourth aspects.

[0071] A method for manufacturing a furnace wall (111) according to a second aspect of the present disclosure is a method for manufacturing a furnace wall (111) of a gasification furnace (101) for gasifying a carbon-containing fuel, in which a protective film (113) for preventing penetration of furnace gas is formed on the surface of a water-cooled wall (112) having a plurality of heat transfer tubes (112a), and a protective material (114) is installed on the surface of the formed protective film (113). [Explanation of symbols]

[0072] 10. Coal gasification combined cycle power generation facility 11 Coal feeding equipment 11a Coal supply line 12 Fuel supply line 13 Char supply line 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 Plant 43 First nitrogen supply line 45 Second nitrogen supply line 46 Char return line 47 Oxygen supply line 48 Foreign matter removal equipment 49 First produced gas line 51 Dust collector 52 Supply hopper 53 Second produced gas line 61 Compressor 62 Combustor 63 Turbine 64 Rotation Axis 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 Water supply line 73 Condenser 74 Exhaust gas purification equipment 75 Chimney 101 Gasifier 102 Singapore 110 Pressure vessels 111 Gasification furnace wall (furnace wall) 112 Water cooling wall 112a Heat transfer tube 112b Holder 113 Protective film 114 Protective Materials 115 Annulus 116 Combustor Club 117 Diffuser section 118 Reductor section 121 Gas outlet 122 Slag Hopper 125 Charvana 126 Combustor-type pulverized coal burner 127 Reductor-type pulverized coal burner 128 Slag melting burner 129 Ignition Torch 130 Diesel burner 131 Evaporator 132 Superheater 134 Economizer H Slag Hole

Claims

1. A furnace wall of a gasification furnace that gasifies a carbon-containing fuel, a water-cooled wall having a plurality of heat transfer tubes; a protective film provided on the surface of the water-cooled wall and having higher corrosion resistance than the water-cooled wall; a protective material provided on the surface of the protective film; Equipped with Furnace wall.

2. The protective material includes slag produced in the gasification furnace. The furnace wall according to claim 1 .

3. The material of the protective film is a nickel-based metal. The furnace wall according to claim 1 .

4. The protective film is provided in an area where the combustion or gasification reaction of the carbon-containing fuel takes place or in an area that comes into contact with the generated gas. The furnace wall according to claim 1 .

5. The furnace wall according to claim 1 is provided. Gasification furnace.

6. A method for manufacturing a furnace wall of a gasification furnace that gasifies a carbon-containing fuel, comprising: A protective film is formed on the surface of the water-cooled wall having a plurality of heat transfer tubes to prevent the penetration of furnace gases, A protective material is placed on the surface of the formed protective film. Manufacturing method of furnace walls.

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