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

Abstract

To provide a gasification furnace wall that makes heat transfer pipes less likely to be damaged and can suitably retain refractory materials or a molten slag layer on surfaces of the heat transfer pipes.SOLUTION: A gasification furnace wall 111 surrounds a core of a gasification furnace. The gasification furnace wall 111 includes: a plurality of cylindrical heat transfer pipes 81 extending along a central axis C, through which a cooling medium circulates; and fins 82 connecting adjacent heat transfer pipes 81. The fins 82 are connected radially outward from the central axis C of the heat transfer pipes 81 with respect to the core.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] 2. Description of the Related Art Conventionally, a carbon-containing fuel gasification facility has been known as a gasification furnace in which a carbon-containing solid fuel such as coal is supplied into the gasification furnace and the carbon-containing solid fuel is partially combusted and gasified to generate combustible gas.

[0003] Coal gasifiers are known as one type of carbon-containing fuel gasification equipment. Coal gasifiers generate a high-temperature field in the core by supplying a large amount of fuel (coal) and oxidizer to a compact core at high temperature and pressure. In the high-temperature core, the gasification reaction occurs and the slag in the coal is melted and separated. The peripheral wall of the core is exposed to high thermal radiation and is therefore made up of heat transfer tubes through which cooling water flows. Nevertheless, the heat transfer tubes are at risk of fatigue damage due to high thermal radiation and its fluctuations. Therefore, coal gasifiers protect the heat transfer tubes from high thermal radiation by maintaining a layer of molten slag itself on the surface of the heat transfer tubes. As such a coal gasification furnace, one in which studs are provided on the outer circumferential surface of a heat transfer tube in order to support the slag layer so as to prevent it from peeling off is known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 63-27450 Summary of the Invention [Problem to be solved by the invention]

[0005] The molten slag layer does not exist when the coal gasifier starts operating. Therefore, in order to protect the heat transfer tubes even when the coal gasifier starts operating, it is considered to start operation with a refractory material composed of the same components as the slag layer already provided on the surface of the heat transfer tube. In this case, after operation starts, the molten slag generated in the coal gasifier is gradually replaced by the refractory material. Therefore, whether at the start of operation or after operation starts, a protective layer (refractory layer or slag layer) is maintained on the surface of the heat transfer tube. For this reason, it is desirable to maintain the protective layer so that it does not peel off from the surface of the heat transfer tube.

[0006] One possible mechanism for maintaining the protective layer is to provide multiple studs on the surface of the heat transfer tube, as in Patent Document 1. However, when the studs are attached to the surface of the heat transfer tube by welding, thermal stress generated during operation of the coal gasifier is concentrated at the base of the studs, which can cause damage to the heat transfer tube starting from this point.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a gasification furnace wall, a gasification furnace, and a method for manufacturing a gasification furnace wall that makes the heat transfer tube less susceptible to damage and can favorably retain refractory material and a molten slag layer on the surface of the heat transfer tube. [Means for solving the problem]

[0008] In order to solve the above problems, the gasification furnace wall, the gasification furnace, and the method for manufacturing the gasification furnace wall of the present disclosure employ the following measures. A gasification furnace wall according to one embodiment of the present disclosure is a gasification furnace wall surrounding a core of a gasification furnace, and comprises a plurality of cylindrical heat transfer tubes extending along a central axis through which a cooling medium flows, and fins connecting adjacent heat transfer tubes, the fins being connected radially outward relative to the core than the central axis of the heat transfer tubes.

[0009] A manufacturing method for a gasification furnace wall according to one embodiment of the present disclosure is a manufacturing method for a gasification furnace wall surrounding a core of a gasification furnace, the gasification furnace wall extending along a central axis and having a cooling medium flowing therethrough, and fins connecting adjacent heat transfer tubes, and the method includes a fin connecting process for connecting the fins radially outward from the central axis of the heat transfer tubes relative to the core. Effect of the Invention

[0010] According to the present disclosure, it is possible to make the heat transfer tube less susceptible to damage and to favorably maintain the refractory material and molten slag layer on the surface of the heat transfer tube. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram showing an integrated coal gasification combined cycle power generation facility according to a first embodiment of the present disclosure. [Diagram 2] 1 is a schematic configuration diagram showing a gasification furnace according to a first embodiment of the present disclosure. [Diagram 3] 1 is a view showing a horizontal cross section of a main part of a gasification furnace according to a first embodiment of the present disclosure. [Figure 4] FIG. 2 is a diagram showing a metal anchor provided in a gasification furnace wall of the gasification furnace according to the first embodiment of the present disclosure. [Diagram 5] FIG. 6 is a schematic configuration diagram showing a gasification furnace wall according to a second embodiment of the present disclosure. [Figure 6] FIG. 11 is a schematic configuration diagram showing a heat transfer tube of a gasification furnace wall according to a second embodiment of the present disclosure. [Figure 7] FIG. 7 is a diagram showing a modification of FIG. 6. [Figure 8] FIG. 11 is a schematic configuration diagram showing a heat transfer tube of a gasification furnace wall according to a third embodiment of the present disclosure. [Figure 9] FIG. 11 is a schematic configuration diagram showing a surface of a heat transfer tube of a gasification furnace wall according to a third embodiment of the present disclosure. [Figure 10] FIG. 10 is a diagram showing a modification of FIG. 9; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic configuration diagram of an integrated coal gasification combined cycle power generation facility 10 to which a gasifier 101 according to an embodiment of the present disclosure is applied. Fig. 2 is a vertical cross-sectional view of the gasifier 101 shown in Fig. 1. In the following explanation, "upper" refers to the vertically upper direction, and "upper" in terms such as upper part and upper surface refers to the vertically upper part. Similarly, "lower" refers to the vertically lower part, and the vertical direction is not precise and may include errors. In the following description and drawings, the up-down direction is defined as the Z-axis direction, one direction included in the horizontal plane is defined as the X-axis direction, and the direction perpendicular to the Z-axis direction and the X-axis direction is defined as the Y-axis direction.

[0013] An integrated coal gasification combined cycle (IGCC) 10 to which the gasifier 101 according to this embodiment is applied uses air as a main oxidizing agent, and adopts an air combustion method in which a combustible gas (generated gas) is generated from fuel in the gasifier 101. The integrated coal gasification combined cycle 10 refines the generated gas generated in the gasifier 101 in a gas refining unit 16 to produce a fuel gas, and then supplies the gas turbine 17 to generate power. That is, the integrated coal gasification combined cycle 10 according to this embodiment is an air combustion type (air blown) power generation facility. Note that, although the air combustion type is described in this embodiment, an oxygen combustion type (oxygen blown) using an oxygen-based oxidizing agent may also be used. As the fuel supplied to the gasifier 101, for example, a carbon-containing solid fuel such as coal is used.

[0014] As shown in FIG. 1 , the integrated coal gasification combined cycle power generation facility (integrated gasification combined cycle power generation facility) 10 includes a coal supply facility 11, a gasification furnace 101, a char recovery facility 15, a gas refining facility 16, a gas turbine 17, a steam turbine 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

[0015] The coal supply facility 11 is supplied with coal, which is a carbon-containing solid fuel, as raw coal, and produces pulverized fuel by pulverizing the coal with 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 with nitrogen gas as a conveying inert gas supplied from an air separation facility 42 described later, and is supplied to the gasification furnace 101. The inert gas is an inert gas with an oxygen content of about 5% by volume or less, and typical examples include nitrogen gas, carbon dioxide gas, and argon gas, but is not necessarily limited to about 5% by volume or less.

[0016] The gasification furnace 101 is supplied with pulverized fuel produced in the coal supply equipment 11, and also with char (unreacted parts of the pulverized fuel and ash) recovered in the char recovery equipment 15 for the purpose of reusing it as energy.

[0017] In addition, the gasifier 101 is connected to a compressed air supply line 41 from the gas turbine 17 (compressor 61), and a part of the compressed air compressed by the gas turbine 17 is boosted to a predetermined pressure by a booster 68 and can be supplied to the gasifier 101. The air separation equipment 42 separates and generates nitrogen and oxygen from air in the atmosphere, and after the air separation equipment 42 and the coal supply line 11a from the coal supply equipment 11 are connected by a first nitrogen supply line 43, the air separation equipment 42 is connected to the gasifier 101 as the fuel supply line 12. In addition, a second nitrogen supply line 45 branched from the first nitrogen supply line 43 is also connected to the gasifier 101 as the char supply line 13 after a char return line 46 from the char recovery equipment 15 is connected. Furthermore, the air separation equipment 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. The nitrogen separated by the air separation equipment 42 is used as a carrier gas for coal or char by flowing through a first nitrogen supply line 43 and a second nitrogen supply line 45. The oxygen separated by the air separation equipment 42 is used as an oxidizing agent (air, oxygen) in the gasification furnace 101 by flowing through an oxygen supply line 47 and a compressed air supply line 41.

[0018] The gasifier 101 is, for example, of a two-stage entrained bed type, and the pulverized fuel and char supplied therein are partially combusted with an oxidizing agent (air, oxygen) to gasify them into generated gas. The gasifier 101 is provided with a foreign matter removal system 48 that discharges coal, ash (coal ash), and the like to the outside. A first generated gas line 49 that supplies generated gas toward the char recovery system 15 is connected to the gasifier 101, and 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 first generated gas line 49 to cool the generated gas to a predetermined temperature before supplying it to the char recovery system 15.

[0019] The char recovery facility 15 includes a dust collector 51 and a supply hopper 52. In this case, the dust collector 51 is composed of one or more cyclones or porous filters, and can separate char contained in the generated gas generated in the gasifier 101. The generated gas from which the char has been separated is sent to the gas purification facility 16 through a second generated gas line 53. The supply hopper 52 stores the char separated from the generated gas by the dust collector 51. Note that a bin may be disposed between the dust collector 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.

[0020] The gas purification equipment 16 purifies the generated gas from which the char has been separated by the char recovery equipment 15 by removing impurities such as sulfur compounds and nitrogen compounds. The gas purification equipment 16 then purifies the generated gas to produce fuel gas, which is supplied to a gas turbine 17. Since the generated 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 liquid or the like, and effectively utilizes the sulfur compounds as gypsum or the like.

[0021] 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, and a fuel gas supply line 66 from the gas purification facility 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected to the combustor 62. The gas turbine 17 is also provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier 101, and a booster 68 is provided in the middle of the line. Therefore, in the combustor 62, 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 are mixed and combusted to generate combustion gas, and the generated combustion gas is supplied to the turbine 63. The turbine 63 rotates the rotating shaft 64 by the supplied combustion gas, thereby rotating the generator 19.

[0022] The steam turbine 18 includes a turbine 69 connected to a rotating shaft 64 of the gas turbine 17, and the generator 19 is connected to the base end of the rotating shaft 64. The steam turbine 18 and the gas turbine 17 do not have to be on the same shaft to rotate and drive one generator 19, and may be on different shafts to rotate and drive multiple generators. The heat recovery steam generator 20 is connected to an exhaust gas line 70 from the gas turbine 17 (turbine 63), and generates steam by exchanging heat between water supplied to the heat recovery steam generator 20 and the exhaust gas from the turbine 63.

[0023] A steam supply line 71 is provided between the heat recovery boiler 20 and a turbine 69 of the steam turbine 18, and a water supply line 72 is also provided between the heat recovery boiler 20 and the turbine 69 of the steam turbine 18, and a condenser 73 is provided on the water supply line 72. 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. Therefore, in the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the heat recovery boiler 20, which rotates the rotary shaft 64 to rotate the generator 19. An exhaust gas purification system 74 is provided between the outlet of the heat recovery boiler 20 and the chimney 75.

[0024] Here, the operation of the integrated coal gasification combined cycle power generation facility 10 of this embodiment will be described.

[0025] In the integrated coal gasification combined cycle power generation facility 10 of this embodiment, when raw coal (coal) is supplied to the coal feeding facility 11, the coal is pulverized into fine particles in the coal feeding facility 11 to become pulverized fuel. The pulverized fuel produced in the coal feeding facility 11 is supplied to the gasifier 101 through the fuel supply line 12 by nitrogen supplied from the air separation facility 42 through a first nitrogen supply line 43.

[0026] In addition, char recovered in a char recovery facility 15 (described later) is supplied to the gasifier 101 through a char supply line 13 by nitrogen supplied from an air separation facility 42 through a second nitrogen supply line 45. Furthermore, compressed air extracted from a gas turbine 17 (described later) is pressurized by a booster 68, and then supplied to the gasifier 101 through a compressed air supply line 41 together with oxygen supplied from the air separation facility 42.

[0027] In the gasifier 101, the supplied pulverized fuel and char are combusted with compressed air (oxygen) and gasified to generate generated gas. The generated gas is then discharged from the gasifier 101 through the first generated gas line 49 and sent to the char recovery facility 15.

[0028] In this char recovery facility 15, the generated gas is first supplied to a dust collector 51, whereby fine char contained in the generated gas is separated. Then, the generated gas from which the char has been separated is sent to the gas refining facility 16 through a second generated gas line 53. Meanwhile, the fine char separated from the generated gas is piled up in a supply hopper 52, and returned to the gasifier 101 through a char return line 46 for recycling.

[0029] The generated gas from which char has been separated by the char recovery facility 15 is purified in the gas purification facility 16 to remove impurities such as sulfur compounds and nitrogen compounds, and fuel gas is produced. A compressor 61 generates compressed air and supplies it to a combustor 62. The combustor 62 generates combustion gas by combusting the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas purification facility 16. The combustion gas rotates a turbine 63, which rotates the compressor 61 and the generator 19 via a rotating shaft 64. In this manner, the gas turbine 17 can generate electricity.

[0030] The heat recovery boiler 20 generates steam by exchanging heat between the exhaust gas discharged from a turbine 63 in the gas turbine 17 and water supplied to the heat recovery boiler 20, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, a turbine 69 is rotationally driven by the steam supplied from the heat recovery boiler 20, thereby rotating a generator 19 via a rotating shaft 64, thereby generating electricity. Note that the gas turbine 17 and the steam turbine 18 do not have to be on the same shaft to rotate and drive one generator 19, and may be on different shafts to rotate and drive multiple generators.

[0031] Thereafter, in the exhaust 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 into the atmosphere through a chimney 75.

[0032] Next, the gasification furnace 101 shown in FIG. 1 will be described with reference to FIG. The gasifier 101 is formed to extend in the vertical direction, and pulverized fuel and oxygen are supplied to the lower side in the vertical direction, and the generated gas that is partially combusted and gasified flows from the lower side to the upper side in the vertical direction. The gasifier 101 has a pressure vessel 110 and a gasifier wall (furnace wall) 111 provided inside the pressure vessel 110.

[0033] The gasifier 101 forms an annulus section 115 in the space between the pressure vessel 110 and the gasifier wall 111. The gasifier 101 also forms a combustor section 116, a diffuser section 117, and a reductor section 118 in this order from the lower side in the vertical direction (i.e., the upstream side in the flow direction of the generated gas) in the space inside the gasifier wall 111.

[0034] The pressure vessel 110 is formed in a cylindrical shape with a hollow space inside, and has a gas outlet 121 at its upper end and a slag hopper 122 at its lower end (bottom). The gasification furnace wall 111 is formed in a cylindrical shape with a hollow space inside, and its outer wall surface is provided opposite to the inner wall surface of the pressure vessel 110.

[0035] The gasifier wall 111 separates the inside 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 changes at a diffuser section 117 between a combustor section 116 and a reductor section 118. The gasifier wall 111 has an upper end portion on the vertically upper side connected to a gas outlet 121 of the pressure vessel 110, and a lower end portion on the vertically lower side provided with a gap between the gasifier wall 111 and the bottom of the pressure vessel 110. A slag hopper 122 formed at the bottom of the pressure vessel 110 stores stored water, and the lower end portion of the gasifier wall 111 is submerged in the stored water, thereby sealing the inside and outside of the gasifier wall 111. Various burners are inserted into the gasifier wall 111, and a syngas cooler 102 is arranged in the internal space.

[0036] The annulus 115 is a space formed inside the pressure vessel 110 and outside the gasifier wall 111, and nitrogen, which is an inert gas separated in the air separation equipment 42, is supplied through a nitrogen supply line (not shown). Therefore, the annulus 115 becomes a space filled with nitrogen. An in-furnace pressure equalizing pipe (not shown) for equalizing the pressure inside the gasifier 101 is provided near the upper part of the annulus 115 in the vertical direction. The in-furnace pressure equalizing pipe is provided so as to communicate the inside and outside of the gasifier wall 111, and approximately equalizes the pressure so that the pressure difference between the internal space (combustor section 116, diffuser section 117, and reductor section 118) of the pressure vessel 110 and the external space (annulus 115) is within a predetermined pressure range.

[0037] In the present embodiment, the combustor section 116 is provided with, for example, a plurality of char burners 125 and a plurality of combustor-based pulverized coal burners (burners) 126, which are provided in order from the upper side of the furnace, on the gasifier wall 111 in the combustor section 116, and a combustion device consisting of a plurality of slag melting burners 128, an ignition torch 129, and a light oil burner 130 is provided in the startup combustion chamber below the combustor. The slag melting burner 128 is for melting the generated solidified slag. The tip of the slag melting burner 128 is used to melt and remove the solidified slag. The plurality of ignition torches 129 and the light oil burner 130 are used to start up the gasifier 101. The high-temperature combustion gas obtained by burning a part of the pulverized fuel and char in the combustor section 116 passes through the diffuser section 117 and flows into the reductor section 118. High-temperature combustion gas produced by burning a portion of the pulverized fuel and char in the combustor section 116 passes through the diffuser section 117 and flows into the reductor section 118 .

[0038] The reductor section 118 is a space where pulverized fuel is supplied to the combustion gas from the combustor section 116, which is maintained at a high temperature required for the gasification reaction, and where partial oxidation combustion is carried out to gasify and decompose the pulverized fuel to produce a product gas which is a volatile matter (carbon monoxide, hydrogen, lower hydrocarbons, etc.).A combustion device consisting of multiple reductor-system pulverized coal burners (burners) 127 is arranged on the gasification furnace wall 111 in the reductor section 118.

[0039] The syngas cooler 102 is provided inside the gasifier wall 111 and is provided vertically above the burners 127 of the reductor section 118. The syngas cooler 102 is a heat exchanger, and an evaporator 131, a superheater 132, and a coal economizer 134 are arranged in this order from the vertically lower side (upstream side in the flow direction of the generated gas) of the gasifier wall 111. The syngas cooler 102 cools the generated gas by exchanging heat with the generated gas generated in the reductor section 118. The evaporator 131, the superheater 132, and the coal economizer 134 are not limited to the numbers shown in the figure.

[0040] Next, the operation of the above-mentioned gasification furnace 101 will be described. The gasifier 101 is ignited by supplying oxidizer and fuel from a plurality of ignition torches 129 and a diesel burner 130. Then, high-temperature combustion gas is generated in the startup combustion chamber (not shown), and the combustor section 116 is heated to a predetermined temperature at which pulverized fuel and char can be combusted.

[0041] In the gasifier 101, nitrogen and pulverized fuel are introduced and ignited by the burner 127 of the reductor section 118, and pulverized fuel, char, and compressed air (oxygen) are introduced and ignited by the char burner 125 and burner 126 of the combustor section 116. Then, in the combustor section 116, high-temperature combustion gas is generated by the combustion of the pulverized fuel and char. Also, in the combustor section 116, ash is melted in the high-temperature gas by the combustion of the pulverized fuel and char, and slag is generated. The slag flows down along the gasifier wall 111, passes through the slag hole H provided at the bottom of the combustor section 116, and is finally discharged to the water stored in the slag hopper 122. Then, the high-temperature combustion gas generated in the combustor section 116 rises to the reductor section 118 through the diffuser section 117. In the reductor section 118, the high temperature required for the gasification reaction is maintained, the pulverized fuel is mixed with the high-temperature combustion gas, and the gasification reaction is carried out by partially burning the pulverized fuel in a high-temperature reducing atmosphere, and a product gas is generated. The gasified product gas flows vertically from the lower side to the upper side. After the pulverized fuel and char are ignited and the gasification reaction starts, and stable operation is ensured by the self-ignition of the pulverized fuel and char, the ignition torch 129 and the light oil burner 130 are extinguished. In addition, a part of the molten slag flowing down along the gasification furnace wall 111 solidifies on the inner peripheral surface of the gasification furnace wall 111 to form a slag layer (protective portion 85 in FIG. 3). The slag layer protects the gasification furnace wall 111 from heat radiation from the furnace core (see arrow T in FIG. 3).

[0042] Next, details of the gasification furnace wall 111 according to this embodiment will be described with reference to FIGS.

[0043] As shown in FIG. 2, the gasification furnace wall 111 surrounds the core (combustor section 116, diffuser section 117, and reductor section 118).

[0044] As shown in FIG. 3, the gasification furnace wall 111 includes a plurality of cylindrical heat transfer tubes 81 through which a cooling medium such as water or water vapor flows, a plurality of fins 82 connecting adjacent heat transfer tubes 81, and metal anchors (supports) 83 fixed to the fins 82. The gasification furnace wall 111 also includes a protective portion 85 that covers the core-side surfaces of the heat transfer tubes 81 and the fins 82. The protective portion 85 protects the heat transfer tubes 81 and the fins 82 from thermal radiation T from the core.

[0045] As shown in Fig. 3, the heat transfer tubes 81 are arranged at equal intervals along the circumferential direction based on the center of the core. Although only three heat transfer tubes 81 are shown in Fig. 3 for convenience of illustration, in reality, the heat transfer tubes 81 are provided over the entire circumferential area. The heat transfer tubes 81 extend vertically in a straight line along a central axis C. The surface (outer circumferential surface) of the heat transfer tubes 81 is a cylindrical surface. The dashed line L1 in Fig. 3 is a line connecting the central axes C of the heat transfer tubes 81 arranged in the circumferential direction.

[0046] The fins 82 are connected to the outside in the radial direction based on the center of the core relative to the central axis C of the heat transfer tubes 81. The fins 82 are plate-shaped members. The side surface 82c (the surface connecting the core side surface and the back surface) of the fins 82 is inclined so that the core side surface 82a has a longer horizontal length than the back surface 82b (the surface opposite to the core side surface 82a). The shape of the fin 82 is merely an example and is not limited to the above-described shape. For example, the horizontal length of the surface 82a of the fin 82 on the core side may be the same as the horizontal length of the back surface 82b.

[0047] The horizontal ends of the fins 82 are fixed by welding to the surfaces of the heat transfer tubes 81. That is, the fins 82 and the heat transfer tubes 81 are connected via welded parts W. More specifically, the side surfaces 82c of the fins 82 and the heat transfer tubes 81 are connected via the welded parts W.

[0048] A retaining space 84 is formed between adjacent heat transfer tubes 81 and the fins 82. A protective portion 85 is filled in the retaining space 84.

[0049] The metal anchor 83 is provided in the holding space 84. The metal anchor 83 is provided between the adjacent heat transfer tubes 81. The metal anchor 83 is a rod-shaped member made of metal (heat-resistant steel). As shown in FIG. 4, the metal anchor 83 is shaped to connect the protective part 85 by being bent multiple times in the vertical direction. As shown in FIG. 3 and FIG. 4, one end of the metal anchor 83 penetrates the fin 82 and is fixed to the fin 82 by welding. In detail, the part of the metal anchor 83 protruding from the back surface 82b of the fin 82 is fixed to the back surface 82b of the fin 82 by welding. The other end of the metal anchor 83 is located closer to the core than the heat transfer tube 81. The part of the metal anchor 83 protruding from the surface 82a of the fin 82 on the core side is fixed to the protective part 85. The metal anchor 83 supports the protective part 85 with respect to the fin 82.

[0050] The protective portion 85 is a refractory material before the operation of the gasifier 101. When the operation of the gasifier 101 is started, as described above, the ash melts in the high-temperature gas due to the combustion of the pulverized fuel and char in the combustor section 116 and the like, and slag is generated, and the generated slag flows down along the gasifier wall 111. The slag flowing down along the gasifier wall 111 is similar in composition and physical properties to the refractory material, so it becomes mixed with the refractory material over time, and the refractory material is gradually replaced by a slag layer. In this way, the protective portion 85 in this embodiment is a refractory material and / or a slag layer. Specifically, the protective portion 85 is a refractory material before the operation of the gasifier 101, and is a slag layer or a mixture of the refractory material and the slag layer after the operation of the gasifier 101 is started.

[0051] 3, the protective section 85 is conceptually divided into a covering section 85a that is radially inward (toward the core) of a line (dashed line L1) connecting central axes C of the heat transfer tubes 81 that are arranged in the circumferential direction, and a holding section 85b that is radially outward of the dashed line L1. The covering section 85a and the holding section 85b are integrally formed, and there is no seam between the covering section and the holding section. The covering portion 85a covers the core-side surface of the heat transfer tube 81. The holding portion 85b is positioned in each holding space 84 and holds the entire protective portion 85.

[0052] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the fins 82 are connected to the outside in the radial direction based on the core, rather than the central axis C of the cylindrical heat transfer tube 81. As a result, the holding space 84 formed by the adjacent heat transfer tubes 81 and the fins 82 has a shape that narrows toward the core. Therefore, the protective part 85 (holding part 85b) provided in the holding space 84 is hardly subjected to thermal radiation and is always well cooled, and is engaged with the heat transfer tube 81, so that it is difficult to fall off to the core side. Therefore, the protective part 85 provided in the holding space 84 holds the entire protective part 85, and the entire protective part 85 can be made difficult to fall off to the core side. In other words, a part of the protective part 85 (holding part 85b) engages with the heat transfer tube 81, thereby fulfilling the role of a self-anchor. Therefore, the protective part 85 can be suitably held on the surface of the heat transfer tube 81 without providing a structure (such as a protrusion) for holding the protective part 85 on the surface of the heat transfer tube 81.

[0053] Furthermore, in this embodiment, the protective portion 85 is held by the annular heat transfer tube 81. This makes it possible to make the heat transfer tube 81 less susceptible to damage, as compared to, for example, a case in which the protective portion 85 is held by a protrusion (such as a stud) attached by welding to the surface of the heat transfer tube 81. Moreover, in this embodiment, the fins 82 are connected radially outward from the central axis C of the heat transfer tubes 81 in the direction of the diameter of the reactor core. This allows the fins 82 to be located away from the reactor core, thereby preventing the fins 82 from being damaged by the heat of the reactor core.

[0054] Furthermore, in this embodiment, the connection portion (near dashed line L1) between covering portion 85a and holding portion 85b of protective portion 85 is less affected by heat radiation T and is easily cooled by heat transfer tube 81. This makes it possible to make the connection portion of protective portion 85 less susceptible to damage from heat. By suppressing thermal damage to the connection portion, it is possible to suppress falling off of protective portion 85.

[0055] Moreover, in this embodiment, the fins 82 are connected radially outward from the center of the core relative to the central axis C of the heat transfer tubes 81. As a result, the horizontal length of the fins 82 is longer than when the fins 82 are connected near a line (dashed line L1) connecting the central axes C of the heat transfer tubes 81 arranged in the circumferential direction. That is, the width of the fins 82 is wider. Therefore, although it may seem that the surface area receiving the thermal radiation T increases, even if the protective portion 85 falls off and the fins 82 are exposed to the core, the heat flux is mitigated because it is restricted by the gaps between the adjacent heat transfer tubes 81.

[0056] Moreover, in this embodiment, a metal anchor 83 is provided to support a protective portion 85 provided in a space (retaining space 84) formed by adjacent heat transfer tubes 81 and the fins 82, relative to the fins 82. The protective portion 85 is narrowed at a connection portion (near the dashed line L1) between the covering portion 85a and the retaining portion 85b, and the connection portion can be reinforced by the metal anchor 83. In addition, the protective portion 85 provided in the holding space 84 is engaged with the heat transfer tube 81 and therefore is unlikely to fall off toward the core side. The metal anchor 83 supports the protective portion 85, which is unlikely to fall off, so that the entire protective portion 85 is unlikely to fall off toward the core side. Therefore, the protective portion 85 can be more suitably held on the surface of the heat transfer tube 81.

[0057] In addition, in this embodiment, since the metal anchor 83 is bent multiple times in the direction intersecting with the furnace radius, the covering portion 85a and the holding portion 85b are even more unlikely to separate from each other. Therefore, the metal anchor 83 can support the protection portion 85 more suitably.

[0058] In this embodiment, the portion of the metal anchor 83 protruding from the back surface 82b of the fin 82 is welded and fixed to the back surface 82b of the fin 82. This prevents the welded portion from being exposed to the thermal radiation T, thereby suppressing damage to the welded portion due to heat.

[0059] [Second embodiment] Next, a second embodiment of the present disclosure will be described with reference to FIGS. This embodiment differs from the first embodiment in that the heat transfer tubes 81 are provided so as to be inclined with respect to the vertical direction (Z-axis direction). In other respects, this embodiment is similar to the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted. In the above first embodiment, an example has been described in which the fins 82 are connected radially outward from the central axis C of the heat transfer tube 81, but in this embodiment, the connection positions of the fins 82 and the heat transfer tube 81 may be any position. As in the above first embodiment, the fins 82 may be connected radially outward from the central axis C of the heat transfer tube 81, or may be connected radially inward from the central axis C of the heat transfer tube 81.

[0060] 5, the heat transfer tubes 81 according to this embodiment extend in a spiral shape. In other words, the heat transfer tubes 81 are provided so as to be inclined with respect to the vertical direction (Z-axis direction). The fins 82 connect the heat transfer tubes 81 arranged in a direction intersecting the extension direction of the heat transfer tubes 81.

[0061] In addition, in the gasifier 101 according to this embodiment, the burners 126 and 127 are arranged, for example, at 90 degree intervals along the circumferential direction of the gasifier wall, and a swirling flow is formed in the core. The swirling direction of the swirling flow may be a direction intersecting the direction in which the heat transfer tube 81 extends (see arrow A1), or may be a direction along the direction in which the heat transfer tube 81 extends (see arrow A2). In other words, the heat transfer tube 81 is provided so as to be along the swirling direction of the swirling flow or a direction intersecting the swirling direction. That is, the heat transfer tube 81 is provided so as to be along the swirling direction or so as to intersect with the swirling direction. The inclination angle of the heat transfer tube 81 is uniquely determined by the design of the gasifier 101, but is at least not vertical and has a certain angle. On the other hand, the angle of the swirling flow can take various states such as A1 and A2 depending on the operating conditions of the gasifier, but this also has a certain angle that is not vertical. For example, when the swirling flow is directed upward, the angle with respect to the horizontal plane may be greater than 0 degrees and equal to or less than 15 degrees. When the swirling flow is directed downward, the angle with respect to the horizontal plane may be greater than 0 degrees and equal to or less than 25 degrees.

[0062] According to this embodiment, the following advantageous effects are obtained. First, in this embodiment, the heat transfer tubes 81 extend so as to be inclined with respect to the vertical direction. As a result, the heat transfer tubes 81 support the protective portions 85 provided between the heat transfer tubes 81 from below. Therefore, the protective portions 85 provided between the heat transfer tubes 81 hold the entire protective portion 85, making it difficult for the entire protective portion 85 to fall off toward the core side. Therefore, the protective portion 85 can be favorably held on the surface of the heat transfer tube 81.

[0063] Furthermore, in this embodiment, a swirling flow is formed in the core of the gasifier 101. As a result, the upward force of the swirling flow supports part of the weight of the protective part 85, making it difficult for the entire protective part 85 to fall off toward the core. Therefore, the protective part 85 can be favorably held on the surface of the heat transfer tube 81.

[0064] First, as shown in Fig. 6, when the heat transfer tube 81 extends in a direction intersecting the swirling direction of the swirling flow, the swirling flow flows in a direction intersecting the extending direction of the heat transfer tube 81. At this time, a part of the support force F1 (hereinafter, sometimes referred to as "reaction force F1") by the heat transfer tube 81 that supports a part of the weight of the protective part 85 is borne by the upward force F2 of the swirling flow. In addition, the necessary adhesive force F3 (hereinafter, sometimes referred to as "holding force F3") is always smaller than the weight F5 or the support force F4, so that the entire protective part 85 is unlikely to fall off toward the core side. Therefore, the protective part 85 can be suitably held on the surface of the heat transfer tube 81.

[0065] Specifically, since the supporting force F4 against the self-weight F5 of the protection part 85 is divided into F3 (for example, adhesive force) and the reaction force F1 by the heat transfer tube due to the inclination of the heat transfer tube 81, F3 is always less than F4, and the required adhesive force F3 can be small. Further, since the upward pushing force F2 by the swirling flow bears a part of the reaction force F1, the reaction force F1 by the heat transfer tube 81 can be small. Due to the combination of these actions, an effect of further strengthening the support of the protection part 85 is produced. On the other hand, when the heat transfer tube 81 extends in the vertical direction, since it is necessary to balance the holding force F3 of the protection part 85 and the self-weight F5 of the protection part 85, it is necessary to make the holding force F3 equal to the self-weight F5. That is, it is necessary to set F3 = F5. From the above, in this embodiment, compared with the case where the heat transfer tube 81 extends in the vertical direction, the holding force F3 required to hold the protection part 85 can be reduced, so that the protection part 85 can be preferably held.

[0066] Next, as shown in FIG. 7, when the heat transfer tube 81 extends along the swirling direction of the swirling flow, the swirling flow flows along the heat transfer tube 81. Therefore, since a part of the adhesive force F3 that supports the self-weight of the protection part 85 is borne by the upward pushing force F2 of the swirling flow, it is possible to make it difficult for the entire protection part 85 to fall off toward the core side. Thus, the protection part 85 can be preferably held on the surface of the heat transfer tube 81.

[0067] Specifically, by applying the supporting force F1 by the heat transfer tube 81 and the upward pushing force F2 by the swirling flow, the required holding force F3 (for example, adhesive force) of the protection part 85 can be reduced. Specifically, since the resultant force (supporting force) F4 of the supporting force F1, the upward pushing force F2, and the holding force F3 only needs to balance the self-weight F5 of the protection part 85, the holding force F3 itself may be smaller than the self-weight F5. That is, it can be set that F3 < F5. At this time, it should be noted that the required adhesive force F3 is further reduced by F2. On the other hand, when the heat transfer tube 81 extends in the vertical direction, the holding force F3 of the protective part 85 and the weight F5 of the protective part 85 need to be balanced, so the holding force F3 and the weight F5 need to be equal to each other. In other words, F3=F5. From the above, in this embodiment, the holding force F3 required to hold the protective portion 85 can be made smaller compared to when the heat transfer tube 81 extends vertically, and therefore the protective portion 85 can be held in an optimal manner.

[0068] [Third embodiment] Next, a third embodiment of the present disclosure will be described with reference to FIGS. This embodiment differs from the first embodiment in that a convex portion is formed on the surface of the heat transfer tube 81. In other respects, this embodiment is similar to the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted. In the above first embodiment, an example has been described in which the fins 82 are connected radially outward from the central axis C of the heat transfer tube 81, but in this embodiment, the connection positions of the fins 82 and the heat transfer tube 81 may be any position. As in the above first embodiment, the fins 82 may be connected radially outward from the central axis C of the heat transfer tube 81, or may be connected radially inward from the central axis C of the heat transfer tube 81.

[0069] The heat transfer tube 81 according to this embodiment has a base 81a that defines a flow path through which the cooling medium flows, and a protrusion 81b that protrudes from the surface of the base 81a and holds a protective part 85. The base 81a and the protrusion 81b are integrally formed, and there is no seam between the base 81a and the protrusion 81b.

[0070] Next, a manufacturing method of the heat transfer tube 81 according to this embodiment will be described. First, a heat transfer tube that is thicker than a heat transfer tube having a thickness that provides the required durability (see dashed line L2 in FIG. 8) is manufactured. That is, a heat transfer tube having the required durability and having excess material (a portion radially outside of dashed line L2) is manufactured. Next, a recess 81c is formed on the surface of the heat transfer tube with the excess material. Specifically, dimples are formed with a drill or grooves are formed with a cutter on the surface of the heat transfer tube with the excess material. In this way, the recess 81c such as a dimple or groove is formed. At this time, the recess 81c is formed so that no corners are formed in the recess 81c. The depth of the recess 81c is set so as not to exceed the excess material portion.

[0071] In this way, by forming the recess 81c, the radially inner portion of the recess 81c becomes the base 81a, and the excess material portion where the recess 81c is not formed becomes the protrusion 81b. Also, the base 81a and the protrusion 81b are integral with each other.

[0072] Examples of the shape of the recess 81c include a groove shape as shown in Fig. 9 and a dimple hole shape as shown in Fig. 10. In the example of Fig. 9, a first groove 81d and a second groove 81e inclined with respect to the extension direction and circumferential direction of the heat transfer tube 81 are formed on the surface of the heat transfer tube 81. The first groove 81d and the second groove 81e are formed so as to intersect. In the example of Fig. 10, a plurality of recesses 81c each having a shape of a plurality of dimple holes are formed. The plurality of recesses 81c are arranged side by side at a predetermined interval in the extension direction and circumferential direction of the heat transfer tube 81. The size, pitch, depth, processing method, etc. of the recesses 81c are appropriately selected according to design conditions, manufacturing constraints, etc.

[0073] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the heat transfer tube 81 has a protruding portion 81b. As a result, the protruding portion 81b holds the protective portion 85, making it difficult for the entire protective portion 85 to fall off toward the core side. Therefore, the protective portion 85 can be suitably held on the surface of the heat transfer tube 81.

[0074] In this embodiment, the base 81a that defines the flow path through which the cooling medium flows and the protrusions 81b that protrude from the surface of the base 81a and hold the protective part 85 are integrally formed. This makes it difficult for stress concentration to occur compared to, for example, a case in which the protective part 85 is held by providing a protrusion (such as a stud) attached by welding to the surface of the heat transfer tube 81, and therefore makes it difficult for the heat transfer tube 81 to be damaged.

[0075] In addition, in this embodiment, the recesses 81c and the protrusions 81b are provided on the surface of the heat transfer tube 81, and therefore the surface of the heat transfer tube 81 has a wetting effect on the liquid slag layer, which can prevent the slag layer from falling off.

[0076] In the present embodiment, the recesses 81c are formed using a drill or a cutter, so that the processing can be carried out continuously on an automated line, and the heat transfer tube 81 can be manufactured easily.

[0077] The present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present disclosure. For example, in the above embodiment, an IGCC equipped with a coal gasifier that produces combustible gas from coal as pulverized fuel has been described as an example, but the gasifier of the present invention can also be applied to gasify other carbon-containing solid fuels, such as biomass fuels such as thinned wood, scrap wood, driftwood, grass, waste, sludge, and waste tires. Furthermore, the gasifier of the present invention can be applied not only to power generation but also to a gasifier for a chemical plant that produces desired chemical substances.

[0078] In addition, while in the above-described embodiment, coal is used as fuel, various types of coal, such as high-grade coal and low-grade coal, can be used. Furthermore, the present invention is not limited to coal, and can also be applied to biomass fuels used as renewable organic resources derived from living organisms. For example, thinning materials, waste wood, driftwood, grass, waste, sludge, waste tires, and recycled fuels (pellets and chips) made from these materials can also be used.

[0079] In this embodiment, a tower-type gasifier has been described as the gasifier 101, but the gasifier 101 can also be a crossover-type gasifier by replacing the gas flow direction of each device in the gasifier 101 so as to match the upstream and downstream of the generated gas.

[0080] In addition, any two or all of the first, second and third embodiments may be combined.

[0081] The gasification furnace wall, the gasification furnace, and the method for manufacturing the gasification furnace wall described in the above-described embodiments can be understood, for example, as follows. The gasification furnace wall according to the first aspect of the present disclosure is a gasification furnace wall (111) surrounding the core of a gasification furnace (101), and comprises a plurality of cylindrical heat transfer tubes (81) extending along a central axis (C) through which a cooling medium flows, and fins (82) connecting adjacent heat transfer tubes (81), the fins (82) being connected radially outward relative to the core than the central axis (C) of the heat transfer tubes (81).

[0082] In addition, the gasification furnace wall according to the second aspect of the present disclosure, in the above-mentioned first aspect, is provided with a protective portion (85) that covers the core side surface of the heat transfer tube (81) and is provided in a space (84) formed by adjacent heat transfer tubes (81) and the fins (82).

[0083] In the above configuration, the fins are connected radially outward from the central axis of the cylindrical heat transfer tube with respect to the core. As a result, a part of the space formed by the adjacent heat transfer tubes and the fins becomes a space (hereinafter referred to as a "holding space") that narrows toward the center of the core. Therefore, for example, when a protective part that covers the surface of the heat transfer tube on the core side is provided in the holding space, the protective part provided in the holding space is engaged with the heat transfer tube, and therefore is unlikely to fall off toward the core. Therefore, the protective part provided in the holding space holds the entire protective part, making it possible to make the entire protective part unlikely to fall off toward the core. Therefore, the protective part can be suitably held on the surface of the heat transfer tube. In addition, in the above configuration, the protective part is held by the annular heat transfer tube, which means that there is no welded part exposed to the reactor core, making the heat transfer tube less susceptible to damage, compared to when the protective part is held by a protrusion (such as a stud) attached by welding to the surface of the heat transfer tube. In addition, in the above configuration, the fins are connected radially outward from the central axis of the heat transfer tube, which allows the fins to be located away from the core, thereby preventing damage to the fins due to the heat of the core. Examples of the protective portion include a refractory material and a molten slag layer.

[0084] In addition, the gasification furnace wall according to a third aspect of the present disclosure, in the first or second aspect described above, is provided with a support portion (83) that supports the protective portion (85) provided in a space (84) formed by adjacent heat transfer tubes (81) and the fins (82) relative to the fins (82).

[0085] The above configuration includes a support portion that supports the protective portion provided in the space (retention space) formed by the fins and adjacent heat transfer tubes with respect to the fins. The protective portion provided in the retention space engages with the heat transfer tubes and is therefore unlikely to fall off toward the core side. The support portion prevents the protective portion from separating from the retention space, thereby making it difficult for the protective portion to fall off toward the core side. This makes it possible to more suitably retain the protective portion on the surface of the heat transfer tube.

[0086] In addition, a gasification furnace wall according to a fourth aspect of the present disclosure is a gasification furnace wall (111) surrounding a core of a gasification furnace (101) that forms a swirling flow in the core, and includes a plurality of heat transfer tubes (81) through which a cooling medium flows, and fins (82) connecting adjacent heat transfer tubes (81), and the heat transfer tubes (81) extend at an angle with respect to the vertical direction.

[0087] In addition, the gasification furnace wall according to a fifth aspect of the present disclosure is the same as in the fourth aspect, and includes a protective portion (85) that covers the core-side surface of the heat transfer tube (81) and is provided in a space (84) formed between adjacent heat transfer tubes (81) and the fins (82).

[0088] In the above configuration, a swirling flow is formed in the core of the gasification furnace. As a result, for example, when a protective part is provided to cover the surface of the heat transfer tube on the core side, the upward force of the swirling flow supports part of the weight of the protective part, making it difficult for the entire protective part to fall off to the core side. Therefore, the protective part can be suitably held on the surface of the heat transfer tube. In the above configuration, the heat transfer tubes extend at an angle to the vertical direction. This allows the heat transfer tubes to support part of the weight of the protective parts provided between the heat transfer tubes from below. Therefore, the protective parts provided between the heat transfer tubes hold the entire protective parts, making it difficult for the entire protective parts to fall off toward the core. This allows the protective parts to be appropriately held on the surfaces of the heat transfer tubes.

[0089] Further, in the gasification furnace wall according to a sixth aspect of the present disclosure, in the fourth or fifth aspect, the heat transfer tube (81) extends along the swirling direction of the swirling flow.

[0090] In the above configuration, the heat transfer tube extends along the swirling direction of the swirling flow. This allows the swirling flow to flow along the heat transfer tube. Therefore, the upward force of the swirling flow serves as part of the adhesive force supporting the weight of the protective part, so less adhesive force is required. This makes it difficult for the entire protective part to fall off toward the core. This makes it possible to suitably hold the protective part on the surface of the heat transfer tube.

[0091] Further, in the gasification furnace wall according to a seventh aspect of the present disclosure, in the above-mentioned fourth or fifth aspect, the heat transfer tube (81) extends along a direction intersecting the swirling direction of the swirling flow.

[0092] In the above configuration, the heat transfer tube extends in a direction intersecting the swirling direction of the swirling flow. This allows the swirling flow to flow in a direction intersecting the extending direction of the heat transfer tube. Therefore, the upward force of the swirling flow is responsible for part of the piping support force that supports part of the weight of the protective part, so that the required piping support force can be reduced. This makes it difficult for the entire protective part to fall off toward the core. This makes it possible to suitably hold the protective part on the surface of the heat transfer tube.

[0093] In addition, the gasification furnace wall according to the eighth aspect of the present disclosure is a gasification furnace wall (111) surrounding the core of a gasification furnace (101), and includes a plurality of heat transfer tubes (81) extending along a central axis (C) and through which a cooling medium flows, and fins (82) connecting adjacent heat transfer tubes (81), wherein the heat transfer tubes (81) have a base (81a) defining a flow path through which the cooling medium flows, and a convex portion (81b) protruding from the surface of the base (81a), and the base (81a) and the convex portion (81b) are integrally formed.

[0094] In addition, the gasification furnace wall according to a ninth aspect of the present disclosure is the same as in the eighth aspect, and includes a protective portion (85) covering the core side surface of the heat transfer tube (81) and provided in a space (84) formed between adjacent heat transfer tubes (81) and the fins (82), and the convex portion (81b) holds the protective portion (85).

[0095] In the above configuration, the heat transfer tube has a protruding portion. With this, for example, when a protective portion is provided to cover the surface of the heat transfer tube on the core side, the protruding portion holds the protective portion, so that the entire protective portion is unlikely to fall off to the core side. Therefore, the protective portion can be appropriately held on the surface of the heat transfer tube. The above-mentioned configuration has a base that defines a flow path through which the cooling medium flows, and a protrusion that protrudes from the surface of the base and holds the protective part, and the base and the protrusion are integrally formed. This makes it difficult for stress concentration to occur compared to, for example, a case in which the protective layer is held by a protrusion (such as a stud) attached by welding to the surface of the heat transfer tube, and therefore makes it difficult for the heat transfer tube to be damaged.

[0096] A gasification furnace according to a first aspect of the present disclosure has a gasification furnace wall (111) according to any one of the first to ninth aspects.

[0097] Furthermore, the manufacturing method for a gasification furnace wall according to the first aspect of the present disclosure is a manufacturing method for a gasification furnace wall (111) surrounding a core of a gasification furnace (101), the gasification furnace wall (111) includes a plurality of cylindrical heat transfer tubes (81) extending along a central axis (C) and through which a cooling medium flows, and fins (82) connecting adjacent heat transfer tubes (81), and includes a fin (82) connecting process for connecting the fins (82) radially outward from the central axis (C) of the heat transfer tubes (81) relative to the core.

[0098] Furthermore, a manufacturing method for a gasification furnace wall according to a second aspect of the present disclosure is a manufacturing method for a gasification furnace wall (111) surrounding a core of a gasification furnace (101) that forms a swirling flow in the core, the gasification furnace wall (111) comprises a plurality of heat transfer tubes (81) through which a cooling medium flows and fins (82) connecting adjacent heat transfer tubes (81), and comprises a heat transfer tube (81) installation process for arranging the heat transfer tubes (81) so as to be inclined with respect to the vertical direction.

[0099] Furthermore, a manufacturing method for a gasification furnace wall according to a third aspect of the present disclosure is a manufacturing method for a gasification furnace wall (111) surrounding a core of a gasification furnace (101), the gasification furnace wall (111) includes a plurality of heat transfer tubes (81) extending along a central axis (C) and through which a cooling medium flows, and fins (82) connecting adjacent heat transfer tubes (81), the heat transfer tubes (81) having a base (81a) defining a flow path through which the cooling medium flows, and a convex portion (81b) protruding from a surface of the base (81a), and the manufacturing method includes a heat transfer tube (81) manufacturing process for manufacturing the heat transfer tube (81) so that the base (81a) and the convex portion (81b) are integrated. [Explanation of symbols]

[0100] 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 equipment 17: Gas turbine 18: Steam turbine 19: Generator 20: Waste heat recovery boiler 41: Compressed air supply line 42: Air separation equipment 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 product 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 81: Heat transfer tube 81a: Base 81b: Convex part 81c: Recess 81d: First groove 81e: 2nd groove 82: Finn 82a :face 82b: Back 82c: side 83: Metal anchor (support part) 84: Holding space 85:Protection Department 85a: Covering part 85b: Holding part 101: Gasifier 102: Singapore 110: Pressure vessels 111: Gasifier wall 115: Annulus 116: Combustor Club 117: Diffuser section 118: Reductor section 121: Gas exhaust port 122: Slag hopper 125: Charvana 126: Burna 127: Burna 128: Slag melting burner 129: Ignition torch 130: Diesel burner 131: Evaporator 132: Superheater 134: Economizer C: Center axis F1: Supporting capacity F2: Push-up force F3: Holding force F4: Supporting capacity F5: Self-restraint H: Slug hole T: Thermal radiation W: Welded part

Claims

1. A gasification furnace wall surrounding a core of a gasification furnace, A plurality of cylindrical heat transfer tubes extending along a central axis and through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with The fin is a gasification furnace wall connected to the outside in a radial direction based on the core, relative to the central axis of the heat transfer tube.

2. The gasification furnace wall according to claim 1 , further comprising a protective portion covering a surface of the heat transfer tube on the side of the furnace core and provided in a space formed between adjacent heat transfer tubes and the fins.

3. The gasification furnace wall according to claim 2 , further comprising a support portion that supports the protection portion, which is provided in a space formed between adjacent heat transfer tubes and the fins, relative to the fins.

4. A gasification furnace wall surrounding a core of a gasification furnace in which a swirling flow is formed, A plurality of heat transfer tubes through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with The heat transfer tube extends at an angle to the vertical direction.

5. The gasification furnace wall according to claim 4 , further comprising a protective portion covering a surface of the heat transfer tube on the side of the core and provided in a space formed between adjacent heat transfer tubes and the fins.

6. The gasification furnace wall according to claim 4 , wherein the heat transfer tube extends along a swirling direction of the swirling flow.

7. The gasification furnace wall according to claim 4 , wherein the heat transfer tube extends in a direction intersecting a swirling direction of the swirling flow.

8. A gasification furnace wall surrounding a core of a gasification furnace, A plurality of heat transfer tubes extending along a central axis and through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with The heat transfer tube has a base that defines a flow path through which the cooling medium flows, and a convex portion that protrudes from a surface of the base, and the base and the convex portion are integrally formed in a gasification furnace wall.

9. a protective portion covering a surface of the heat transfer tube on the core side and provided in a space formed between adjacent heat transfer tubes and the fins; The gasification furnace wall according to claim 8 , wherein the protrusion holds the protective portion.

10. A gasification furnace having the gasification furnace wall according to any one of claims 1 to 9.

11. A method for manufacturing a gasification furnace wall surrounding a core of a gasification furnace, comprising the steps of: The gasification furnace wall is A plurality of cylindrical heat transfer tubes extending along a central axis and through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with A method for manufacturing a gasification furnace wall, comprising a fin connecting step of connecting the fins radially outward from the central axis of the heat transfer tube relative to the reactor core.

12. A method for manufacturing a gasification furnace wall surrounding a core of a gasification furnace in which a swirling flow is formed in the core, comprising the steps of: The gasification furnace wall is A plurality of heat transfer tubes through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with The method for manufacturing a gasification furnace wall includes a heat transfer tube installation step of installing the heat transfer tube so as to be inclined with respect to the vertical direction.

13. A method for manufacturing a gasification furnace wall surrounding a core of a gasification furnace, comprising the steps of: The gasification furnace wall is A plurality of heat transfer tubes extending along a central axis and through which a cooling medium flows; Fins connecting adjacent heat transfer tubes; Equipped with The heat transfer tube has a base portion defining a flow path through which the cooling medium flows, and a protrusion portion protruding from a surface of the base portion, A method for manufacturing a gasification furnace wall, comprising: a heat transfer tube manufacturing step of manufacturing the heat transfer tube so that the base portion and the protrusion portion are integrated.

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