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

Abstract

Provided is a furnace wall in which corrosion is less likely to occur in a water-cooled wall even when a component contained in an in-furnace gas permeates thereinto through a refractory material. A furnace wall (111) of a gasification furnace comprises: a water-cooled wall (112) that has a plurality of heat transfer pipes (112a); a protective film (113) that is provided on the surface of the water-cooled wall (112) and has a 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). The protective material (114) may contain slag that is generated in the gasification furnace.

Description

Furnace wall, gasification furnace, and furnace wall manufacturing method

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

[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 wall of the gasifier furnace is provided with a refractory material. However, during operation of the gasifier, hydrogen sulfide (HS) and hydrogen chloride (HCl) contained in the gas inside the furnace may penetrate through voids and cracks in the porous refractory material and reach the water-cooled wall. In this case, gas corrosion may occur in the water-cooled wall. Furthermore, hydrogen chloride may react with the metal of the water-cooled wall to generate iron chloride (FeCl), which may cause dissolved salt corrosion in the water-cooled wall. Furthermore, when the gasifier is stopped, the iron chloride deliquesces, wetting the water-cooled wall, and water containing a high concentration of chlorine may flow down the gap (boundary) between the water-cooled wall and the refractory material, 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.

[0005] Japanese Unexamined Patent Publication No. 155588 / 1988

[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.

[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 means: The 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 that is provided on the surface of the water-cooled wall and has higher corrosion resistance than the water-cooled wall, and a protective material that is 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.

[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.

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

[0013] [Configuration and Operation of the Entire Facility] An embodiment of the present disclosure will be described below with reference to the drawings. In the following description, "upper" in terms such as "upper", "top", and "top surface" refers to the upper side in the vertical direction. "Lower" in terms such as "lower", "bottom", and "surface" refers to the lower side 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) 10 to which the gasifier 101 is applied is a facility in which the product gas generated in the gasifier 101 is purified in a gas purification system 16 to produce fuel gas, which is then supplied to a gas turbine 17 to generate power. The integrated coal gasification combined cycle (IGCC) 10 uses air as the main oxidizer and employs an air combustion system in which combustible gas (product gas) is generated from fuel in the gasifier 101. In other words, the integrated coal gasification combined cycle (IGCC) 10 is an air combustion (air-blown) power generation facility. An example of the fuel supplied to the gasifier 101 is a carbon-containing fuel such as coal. Note that, although the present embodiment will be described using an air combustion type integrated coal gasification combined cycle (IGCC) 10 as an example, the integrated coal gasification combined cycle (IGCC) 10 may also be an oxygen combustion (oxygen-blown) system that uses oxygen as the main oxidizer.

[0016] As shown in FIG. 1 , the integrated coal gasification combined cycle power generation facility 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 by the coal supply facility 11 is pressurized at the outlet of the coal supply line 11a by an inert gas (inert gas for transport) supplied from an air separation facility 42 (described later), and is supplied to the gasifier 101. The inert gas is an inert gas having an oxygen content of approximately 5% by volume or less, and examples of the inert gas include nitrogen gas, carbon dioxide gas, and argon gas. However, the oxygen content of the inert gas is not necessarily limited to approximately 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 gasifier 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 gasifier 101. The air separation equipment 42 is equipment that 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, which runs from the point of the first nitrogen supply line 43 where the coal feed line 11a is connected to the gasifier 101, is used 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 (at a point other than the fuel supply line 12) and is connected to the gasifier 101. The second nitrogen supply line 45, which runs from the point at which the char return line 46 is connected to the gasifier 101, serves 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 (carrying inert gas) for coal and char. 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 gasifier 101 as an oxidant (air, oxygen) in the gasifier 101.

[0020] The gasifier 101 is a facility that gasifies pulverized fuel and char supplied therein by partial combustion using an oxidizer (air, oxygen) to generate a 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 system 48 that discharges coal, ash (coal ash), and the like to the outside. The gasifier 101 is connected to a first generated gas line 49 that supplies generated gas toward the char recovery system 15, so that the generated gas containing char can be discharged. As shown in FIG. 2 , a syngas cooler 102 (gas cooler) may be provided inside the gasifier 101 (the flow path through which the generated gas flows) to cool the generated gas to a predetermined temperature before supplying it to the char recovery system 15. Note that a syngas cooler different from the syngas cooler 102 installed inside the gasifier 101 may be provided in another flow path through which the generated 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 facility 16 through a second product gas line 53. The supply hopper 52 is a device that stores the char separated from the product gas by the dust collector 51. The char return line 46 connected to the supply hopper 52 is connected to the second nitrogen supply line 45. It is to be noted that 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 equipment that purifies the gas 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 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 rotating shaft 64. 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 are connected to the combustor 62. The compressor 61 is connected to a compressed air supply line 41 connected to the gasifier 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 combusting 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 equipment 16. The combustion gas generated in the combustor 62 is supplied to the turbine 63 via the combustion gas supply line 67. The turbine 63 rotates the rotating shaft 64 using the supplied combustion gas, thereby rotating and driving the generator 19.

[0024] The steam turbine 18 includes a turbine 69 coupled to a rotary shaft 64. The generator 19 is coupled to this rotary shaft 64. The steam turbine 18 and the gas turbine 17 do not have to drive one generator 19 on the same shaft, and multiple generators 19 may be driven 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 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 also provided in the water supply line 72. The turbine 69 of the steam turbine 18 is rotationally driven by steam supplied from the heat recovery steam generator 20, and rotates a rotary shaft 64 to rotationally drive the generator 19. The steam generated in the heat recovery steam generator 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 facility 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 produce pulverized fuel. The pulverized fuel produced by 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 gasifier 101 through the char supply line 13 by nitrogen supplied from the air separation facility 42 through the second nitrogen supply line 45. Compressed air extracted from the compressor 61 of the gas turbine 17 is pressurized by the booster 68, and then flows through the compressed air supply line 41 together with oxygen supplied from the air separation facility 42 and is supplied to the gasifier 101.

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

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

[0031] The generated gas supplied to the gas purification equipment 16 is purified by removing impurities such as sulfur compounds and nitrogen compounds (the purified generated gas is called fuel gas). Compressed air compressed by the compressor 61 is supplied to the combustor 62. The combustor 62 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 equipment 16. This combustion gas drives and rotates a turbine 63, which in turn drives and rotates 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 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 gasifier 101 includes a pressure vessel 110 extending in the vertical direction and a gasifier 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 to produce gas that flows from the bottom to the top.

[0036] An annulus section 115 is formed in the space between the pressure vessel 110 and the gasifier wall 111. In the space within the gasifier 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 internal space and an external space (annulus section 115). The cross-sectional shape of the gasifier wall 111 (the cross-sectional shape of a cut surface perpendicular to the vertical direction) changes at a diffuser section 117 between the combustor section 116 and the reductor section 118. The upper end of the gasifier wall 111 is connected to a gas outlet 121 of the pressure vessel 110, and the lower end is provided with a gap between it and 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 gasifier wall 111 is immersed in the water, sealing the inside and outside of the gasifier wall 111. Various burners are inserted into the gasification furnace wall 111, and a syngas cooler 102 is disposed in the internal space of the gasification furnace 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 communicates 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. A plurality of ignition torches 129 and a light oil burner 130 are burners used to start up the gasifier 101. The 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 that has flowed in from the combustor section 116 and partially burns it, thereby 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 multiple reductor-based pulverized coal burners 127 is arranged on the gasifier wall 111 that surrounds the reductor section 118 (the gasifier wall 111 that defines the reductor section 118).

[0043] The syngas cooler 102 is provided above the reductor-system pulverized coal burners 127 within the gasifier wall 111 (internal space). The syngas cooler 102 is a heat exchanger. The syngas cooler 102 has an evaporator 131, a superheater 132, and an economizer 134, arranged in this order from bottom to top (upstream in the direction of flow of the produced gas). The syngas cooler 102 cools the produced gas by exchanging heat with the produced gas generated in the reductor section 118. Note that 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 diesel burners 130. This generates high-temperature combustion gas in the startup combustion chamber, and heats the combustor section 116 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 and combustor-system pulverized coal burner 126 in the combustor section 116. Pulverized fuel and nitrogen are also introduced and ignited from the reductor-system pulverized coal burner 127. In the combustor section 116, high-temperature combustion gas is generated by the combustion of the pulverized fuel and char. In the combustor section 116, ash contained in the fuel melts in the high-temperature gas, generating slag. The molten slag flows down the gasifier wall 111, passes through a 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] The high-temperature combustion gas generated in the combustor section 116 flows through the diffuser section 117 into the reductor section 118. The reductor section 118 is maintained at a high temperature required for the gasification reaction, where the pulverized fuel mixes with the high-temperature combustion gas. The pulverized fuel is partially combusted in a high-temperature reducing atmosphere, causing the gasification reaction to generate product gas. The product gas flows from bottom to top. The pulverized fuel and char ignite, initiating the gasification reaction. After stable operation is ensured by self-ignition of the pulverized fuel and char, the ignition torch 129 and diesel burner 130 are extinguished.

[0048] [Details of Furnace Wall] As shown in FIG. 3 , the gasification furnace 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 are connected to each other by connecting fins (not shown) to form a hollow, cylindrical water-cooled wall 112. To cool the gasifier wall 111 (to protect the gasifier wall 111 from heat), water is supplied to each heat transfer tube 112a from below. The supplied water is heated by heat exchange with furnace gas (gas present in the furnace, such as combustion gas and generated gas) as it flows 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-cooled wall 112 is supplied to, for example, a coal 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. Furthermore, 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 interior (internal space) of the gasifier wall 111 if the protective film 113 and protective material 114 were not present. Therefore, the surface of the water-cooled wall 112 is the surface of any of the heat transfer tubes 112a, connecting fins (not shown), and holders 112b. The protective film 113 is a film that is more corrosion-resistant than the water-cooled wall 112 (a film with excellent corrosion resistance), and has the function of protecting the water-cooled wall 112 from components of the furnace gas (such as H2S and HCl) 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, for example, a thermally sprayed film applied by thermal spraying. However, 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 thermal sprayed film). Nickel-based metals are an example of the material 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 inside the gasifier wall 111 (internal space) if the protective material 114 were not present. The protective material 114 is held to the water-cooled wall 112 by a holder 112b on whose surface the protective film 113 is formed. The protective material 114 is a member with 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, for example, the inside of the gasifier wall 111 (internal space).

[0054] Before the gasifier 101 is put into operation or in the initial stage of operation, the protective material 114 is a refractory material. Silicon carbide (SiC) is an example of a refractory material. 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 the surface of the refractory material serving as the protective material 114. The molten slag has a high temperature, for example, of 1250°C to 1350°C, and melts the refractory protective material 114. Over time, the molten slag penetrates into or corrodes the protective material 114, becoming integrated with the protective material 114. The refractory material is then 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 gasification furnace 101 is operated or in the initial stage of operation, and after the gasification furnace 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] [Method for Manufacturing Gasifier Wall] The gasifier wall 111 configured as described 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 fire-resistant material is installed as the protective material 114 on the surface of the protective film 113. At this time, the protective material 114 is held to the water-cooled wall 112 by a holder 112b on whose surface the protective film 113 is formed.

[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 pulverized fuel and char or the gasification reaction of pulverized fuel takes place or the area that comes into contact with 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. This is because the combustor section 116, the diffuser section 117, and the reductor section 118 are spaces that are particularly high in temperature and pressure within the gasifier wall 111, 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 also be applied to areas other than these.

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

[0058] The gasifier 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 voids or 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, because the protective film 113 is provided on the surface of the water-cooled wall 112, i.e., because 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 it less likely for the protective film 113 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 combustion or gasification reactions take place or the area that comes into contact with the generated gas, the protective film 113 can protect areas that are in a high-temperature, high-pressure environment where corrosion is particularly likely to occur.

[0061] [Additional Notes] 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 system 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), making it less likely for corrosion to occur in the water-cooled wall (112). Furthermore, because 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 it less likely for the protective film (113) to deteriorate 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 before 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] The furnace wall (111) according to the fourth aspect of the present disclosure is any one of the first to third aspects, in which the protective film (113) 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.

[0069] The protective film (113) is provided in an area where combustion or gasification reactions take place or an area that comes into contact with the generated gas, and therefore the protective film (113) can protect areas that are 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) that prevents 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).

[0072] REFERENCE SIGNS LIST 10 Integrated coal gasification combined cycle power generation facility 11 Coal supply facility 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 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 facility 49 First produced gas line 51 Dust collector 52 Supply hopper 53 Second produced gas 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 Water supply line 73 Condenser 74 Exhaust gas purification equipment 75 Chimney 101 Gasifier 102 Syngas cooler 110 Pressure vessel 111 Gasifier wall (furnace wall) 112 Water-cooled wall 112a Heat transfer tube 112b Holder 113 Protective film 114 Protective material 115 Annulus section 116 Combustor section 117 Diffuser section 118 Reductor section 121 Gas outlet 122 Slag hopper 125 Char burner 126 Combustor-type pulverized coal burner 127 Reductor-type pulverized coal burner 128 Slag melting burner 129 Ignition torch 130 Light oil burner 131 Evaporator 132 Superheater 134 Economizer H Slag Hall

Claims

1. A furnace wall of a gasification furnace that gasifies a carbon-containing fuel, comprising: 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.

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

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

4. The furnace wall according to claim 1, wherein 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.

5. A gasification furnace comprising the furnace wall according to claim 1.

6. A method for manufacturing a furnace wall of a gasification furnace that gasifies carbon-containing fuels, comprising forming a protective film on the surface of a water-cooled wall having a plurality of heat transfer tubes to prevent penetration of furnace gas, and installing a protective material on the surface of the formed protective film.

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