JP5478867B2 - Fire wall device and heat exchanger - Google Patents

Description

  The present invention relates to a fire wall device that holds a fire resistant material on the inner peripheral surface of a corrosive hot gas flue and a heat exchanger equipped with the fire wall device.

  For example, heat is recovered from the high-temperature exhaust gas generated during the combustion and melting treatment of waste, and the exhaust gas is cooled while the heat energy is effectively used, and the wall of the gas flow path is protected from heat and corrosion. It is disclosed in Patent Document 1.

  In the furnace wall structure of Patent Document 1, the furnace wall around the gas flow path is formed by a water pipe wall composed of a plurality of water pipes and fins connecting the water pipes, and the inner peripheral surface of the water pipe wall is refractory. A wall is attached and the outer peripheral surface of the water pipe wall is covered with a heat insulating material. Although the means for attaching the fire wall to the water pipe wall is not disclosed, it is considered that the fire wall is held via an anchor or the like attached to the water pipe wall.

In addition, as shown in FIGS. 19 and 20, another conventional heat exchanger for exhaust gas has an outer cylinder 52 provided with a predetermined gap around the outer periphery of a pipe body 51 that forms a flue 50 that is a discharge flow path for exhaust gas. In some arrangements, an annular space chamber 53 for introducing low-temperature air is formed between the tube body 51 and the outer cylinder 52. A fire wall 55 is attached to the inner peripheral surface of the tubular body 51 via an anchor 54, and a heat insulating material 56 is attached to the outer peripheral surface of the outer cylinder 52.
JP-A-10-325527

  However, the water pipe wall and fire wall, and the tube and fire wall have a large difference in thermal expansion coefficient. When temperature fluctuation is repeated due to repeated operation and stoppage, the fire wall is cracked and peeled off. There is a problem that the fire wall may come off due to damage, and the anchor and water pipe wall are corroded by the corrosive high temperature gas that has entered through the gaps between the cracked fire walls.

  The present invention provides a fire wall device and a heat exchanger that can solve the above-mentioned problems, prevent damage and peeling due to a difference in thermal expansion between the fire wall and the pipe body, and prevent corrosion due to corrosive high temperature gas. The purpose is to provide.

The fire wall device according to claim 1 is:
A fire wall device that attaches a fire wall to the inner peripheral surface of a cylindrical body that guides corrosive hot gas in the axial direction,
The fire wall is composed of a plurality of fire blocks divided into a plurality of axial directions and circumferential directions of the cylindrical body,
For each block row of refractory blocks arranged along each axial direction, through holes communicating with each refractory block are formed penetrating in the axial direction.
A long support member supported by a cylindrical body is fitted into the through hole, and an allowable gap that allows thermal deformation of the fireproof block and the long support member is provided between the long support member and the through hole. Forming,
The long support member is formed in a hollow shape, and a cooling means for introducing a low-temperature gas higher in pressure than the high-temperature gas is provided in the hollow portion,
The long support member is formed with a plurality of pores that fill the through hole from the long support member with a low temperature gas .

Refractory wall system according to claim 2, wherein, in the structure according to claim 1,
At least one of a circumferentially adjacent surface adjacent to the circumferential direction of the refractory block and an axially adjacent surface adjacent to the axial direction is formed with a stepped portion or an uneven portion that engage with each other.

The heat exchanger according to claim 3 is:
A double cylinder structure is formed by an outer cylinder fitted with an annular space in the cylinder, and a hot gas flow path for introducing corrosive high temperature gas is formed in the cylinder, and low temperature gas is introduced into the annular space. A heat exchanger that forms a low temperature gas flow path and performs heat exchange between the high temperature gas in the high temperature gas flow path and the low temperature gas in the low temperature gas flow path,
The fire wall device according to claim 1 or 2 is provided on an inner peripheral surface of the cylindrical body.

The heat exchanger according to claim 4 is:
A hot gas channel for guiding corrosive hot gas is formed in the axial center portion of the fire wall attached to the inner peripheral surface of the cylindrical body by the fire wall device , and a low temperature gas is introduced into the fire wall. A heat exchanger in which a low-temperature gas flow path is formed and performs heat exchange between a high-temperature gas in the high-temperature gas flow path and a low-temperature gas in the low-temperature gas flow path,
The fireproof wall is constituted by a fireproof block divided into a plurality in the axial direction and the circumferential direction of the cylindrical body,
The refractory wall device includes a through hole that is formed in the block row of the refractory blocks arranged along each axial direction and is formed in the axial direction so as to communicate with each other. A cooling gas pipe which is fitted through an allowable gap allowing thermal deformation of the block and the long support member and holds the fireproof block and forms a low-temperature gas flow path;
The low-temperature gas introduced into the cooling gas pipe has a pressure higher than that of the high-temperature gas, and a plurality of pores that fill the through-holes with the low-temperature gas are formed in the cooling gas pipe .

According to a fifth aspect of the present invention, in the configuration of the fourth aspect , the heat exchanger is engaged with at least one of a circumferentially adjacent surface adjacent to the circumferential direction and an axially adjacent surface adjacent to the axial direction of the refractory block. The step part or the uneven part to be formed is formed.

According to the first aspect of the present invention, the fireproof wall attached to the inner peripheral surface of the cylindrical body that guides the corrosive high temperature gas is a fireproof block divided in the circumferential direction and the axial direction, Because each block row arranged along the axial direction is held by the long support member through the through hole, and an allowable gap allowing thermal deformation is provided between the long support member and the through hole. Stress due to thermal expansion of the inner cylinder and the long support member is not applied to the fireproof block, and damage and peeling due to a difference in thermal expansion coefficient between the inner cylinder and the fireproof block can be prevented.
Further, by flowing a low temperature gas into the long support member, the long support member can be cooled effectively, and the long support member can be effectively prevented from being burned out.
Furthermore, corrosive hot gas flows into the through hole due to cracking or chipping of the refractory by filling the through hole with a low-temperature gas higher in pressure than the high-temperature gas in the hollow portion of the long support member. This can be prevented in advance, and corrosion of the long support member and the peripheral surface of the cylindrical body due to the high-temperature gas can be prevented.

According to the second aspect of the present invention, the stepped portion and the concavo-convex portion formed on the adjacent surface can absorb the thermal expansion and displacement of the refractory block and can prevent the formation of a gap due to misalignment. It is possible to prevent the gas from flowing into and contacting the inner peripheral surface of the cylindrical body through the adjacent surface, and effectively prevent corrosion of the inner peripheral surface of the cylindrical body.

According to invention of Claim 3, the fire wall attached to the internal peripheral surface of the cylinder which guides corrosive high temperature gas is formed with the fire block formed by dividing | segmenting into the circumferential direction and an axial direction. At the same time, these fireproof blocks are held by the long support member through the through hole formed in the axial direction, and an allowable gap for allowing thermal deformation is provided between the long support member and the through hole. The stress due to the thermal expansion of the inner cylinder is no longer applied to the refractory block, and damage and peeling due to the difference in the thermal expansion coefficient between the inner cylinder and the refractory block can be prevented. Further, by introducing a low temperature gas into the long support member, the long support member can be cooled to prevent burning. Further, by filling the through hole with the low temperature gas from the fine holes, the high temperature gas can be prevented from flowing into the through hole, and corrosion of the long support member and the peripheral surface of the cylindrical body can be prevented.

According to the invention of claim 4 , the step portion and the concavo-convex portion can absorb the misalignment of the refractory block, can prevent the formation of a gap due to the misalignment, and the high-temperature gas is the inner peripheral surface of the cylindrical body. Can be prevented, and corrosion of the inner peripheral surface of the cylindrical body can be prevented.

  The present invention relates to a fire wall device for attaching a refractory material (fire wall) to the inner peripheral surface of a cylinder of a gas discharge duct that discharges corrosive high temperature gas from a gasification melting furnace for waste, and the fire wall device. It relates to the heat exchanger provided. This heat exchanger is installed at a predetermined portion of the gas discharge duct, and is provided with a high temperature gas flow path in which the high temperature gas flows in the axial direction at the axial center portion, and a low temperature gas provided on the outer peripheral portion of the high temperature gas flow path. It has a low-temperature gas flow path that flows in the direction of the heart, performs heat exchange between the high-temperature gas flowing in the high-temperature gas flow path and the low-temperature gas flowed in the low-temperature gas flow path, recovers heat from the high-temperature gas, and cools In addition, it prevents corrosion caused by high-temperature gas. In Embodiment 1 thru | or 5, the basic structure of the fire wall apparatus which attaches a fire wall well to the internal peripheral surface of a cylinder is comprised similarly.

[Embodiment 1]
Hereinafter, Embodiment 1 of the heat exchanger provided with the fire wall apparatus according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the heat exchanger 1 includes a cylindrical gas discharge duct 11, a high-temperature gas flow path 10 formed in an axial center portion of an inner cylinder (tubular body) 15, A double structure comprising a low-temperature gas passage 16 formed in an annular space between the cylinder 15 and a casing (outer cylinder) 12 disposed on the outer periphery thereof is formed in the hot gas passage 10 in the axial direction. A corrosive hot gas HG that flows from the bottom to the top along the low temperature gas flow path 16 along the axial direction in the low temperature gas flow path 16 (or from the top to the bottom). (Low temperature air) It is comprised so that heat exchange may be performed between LG.

  The casing 12 is made of heat-resistant steel, and a heat insulating material 12a is attached to the outer peripheral surface thereof. A fire wall 14 is attached to the inner peripheral surface of the inner cylinder 15 by the fire wall device 13 according to the present invention.

  The fire wall 14 is divided into a plurality of parts in the circumferential direction, and is divided into a plurality of parts in the axial direction of the hot gas flow path 10, and is constituted by a plurality of fire blocks 17 having a rectangular front view and an arc-shaped cross section. . In the fire wall device 13, a single through hole 18 penetrating in the axial direction is formed at the center position of the cross section in plan view of each of the refractory blocks 17 in the axial block row arranged in the axial direction, and communicates with each other. Has been. Then, a heat-resistant steel support rod (long support member) 19 that holds the fireproof block 17 with a predetermined gap (thermal deformation allowable gap) that can be displaced by thermal deformation is fitted in the through holes 18. Has been configured. These support rods 19 are supported at the upstream end in the gas flow direction by the upstream support member 20A in the end fireproof block 17A, and at the downstream end (upper portion in FIG. 3) in the gas flow direction at the end fireproof block 17B. It is supported by the downstream support member 20 </ b> B and is installed in the axial direction in parallel along the inner surface of the inner cylinder 15.

  As shown in FIGS. 4 and 5, the fireproof block 17 has concave and convex portions 17 d (or stepped portions) that are fitted to each other on the circumferentially adjacent surface 17 c that is adjacent to the circumferential direction of the fireproof block 17. As shown to (a), the clearance gap delta1 which accept | permits the displacement of the circumferential direction is formed between the contact surfaces in alignment with the longitudinal cross-section of the circumferential direction adjacent surface 17c, and the clearance gap of the circumferential direction is formed in the circumferential direction adjacent surface 17c. Even if this occurs, corrosion due to the inflow of the high temperature gas HG and the contact with the inner cylinder 15 can be prevented by the uneven portion 17d. Step portions 17b (or concavo-convex portions) that engage with each other are formed on two axially adjacent surfaces 17a that are adjacent to each other in the axial direction, and as shown in FIG. 6B, adjacent axially adjacent surfaces. By forming an allowable gap δ2 that allows displacement in the axial direction between the contact surfaces along the cross section of 17a, even if a gap in the axial direction occurs on the axially adjacent surface 17a, the step 17b causes a high temperature. Corrosion due to inflow of the gas HG and contact with the inner cylinder 15 can be prevented.

  An annular air supply header 21 to which the low-temperature gas LG is supplied from the blower 23 through the air supply pipe 24 is disposed on the outer peripheral portion of the upstream end (or downstream side) of the heat exchanger 1. The upstream end of the gas flow path 16 is connected to each other via a connecting pipe 22 that penetrates the casing 12. An annular exhaust header 25 is disposed on the outer peripheral portion of the downstream end (or upstream side) of the heat exchanger 1, and the exhaust header 25 and the downstream end of the low-temperature gas flow path 16 connect the connecting pipe 26 penetrating the casing 12. Connected through. Connected to the exhaust header 25 is a high-temperature air exhaust pipe 27 that sends the heated low-temperature gas LG to equipment used such as a heater or a turbine.

  In the above configuration, the high temperature gas HG is flowed from the upstream side to the downstream side along the axial direction in the high temperature gas flow path 10, and the low temperature gas LG is introduced from the supply header 21 to the low temperature gas flow path 16 to the upstream side. Then, the low temperature gas LG is heated and recovered through the fire wall 14 and the inner cylinder 15 and the high temperature gas HG is cooled. Even if the fire wall 14 and the inner cylinder 15 and the support rod 19 made of heat resistant steel having a larger thermal expansion coefficient than the fire wall 14 are heated and thermally expanded, the support rod 19 allows thermal deformation in the through hole 18. Since the fireproof block 17 is held loosely with a gap as much as possible, the thermal stress of the casing 12, the inner cylinder 15, and the support rod 19 is not applied to the fireproof block 17. No damage such as chipping or cracking occurs.

  According to the first embodiment, the refractory wall 14 is constituted by the plurality of refractory blocks 17 divided in the circumferential direction and the axial direction, and these refractory blocks 17 are only allowed to be thermally deformed in the through holes 18. Since it is configured to be held by the support rod 19 with a gap, stress due to thermal expansion of the inner cylinder 15 is not applied to the fireproof block 17, and the inner cylinder 15 and the fireproof block 17 are damaged due to a difference in thermal expansion coefficient. And peeling can be effectively prevented.

  In addition, although the step part 17b was formed in the axial direction adjacent surface 17a in the fireproof block 17, and the uneven part 17d was formed in the circumferential direction adjacent surface 17c, as shown to Fig.7 (a), (b), Even if the stepped portion 17b is formed only on the axially adjacent surface 17a, or the uneven portion 17d is formed only on the circumferentially adjacent surface 17c, as shown in FIGS. 8A and 8B, a sealing effect can be obtained. be able to.

[Embodiment 2]
As shown in FIGS. 9 to 11, the second embodiment is the same as the fire wall apparatus 13 of the first embodiment, except that the support rod 19 is a support tube (cooling air) CG that is supplied with cooling gas (cooling air) CG in the hollow portion. The scale support member 31 is replaced.

  That is, an annular cooling air supply header 33 is provided on the outer peripheral portion of the upstream end of the heat exchanger 1, and an annular exhaust header 25 is provided on the outer peripheral portion of the downstream end. A part of the low-temperature gas LG supplied from the blower 23 to the supply header 21 through the air supply pipe 24 is introduced into the cooling supply header 33 through the branch connection pipe 32 and supplied from the cooling supply header 33. After the cooling gas CG is supplied to the upstream end of the support pipe 31 via the trachea 34 to cool the support pipe 31, this cooling gas CG is sent from the downstream end of each support pipe 31 to the exhaust header 25 via the exhaust pipe 35. It is configured to discharge.

  According to the above configuration, since the support pipe 31 cooled by the cooling gas CG is provided, it is possible to prevent the support pipe 31 from being burned out and to reduce the strength, and to hold the fireproof block 17 reliably.

  As shown in FIG. 12, four heat transfer fins 36 are provided on the inner surface of the support tube 31 at symmetrical positions intersecting at right angles on the cross section along the axial direction. It can also be configured to effectively transfer heat to the CG.

[Embodiment 3]
As shown in FIG. 13, in the third embodiment, in the fire wall device 13 of the second embodiment, a plurality of pores 31a are formed in the support pipe 31 at a predetermined pitch, and a low temperature gas (low temperature air) LG is formed. The portion is pressurized and filled into the through hole 18 as the corrosion prevention gas PG. Note that the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  That is, with reference to FIG. 9, a part of the low temperature gas LG taken out via the branch connection pipe 32 is pressurized to a pressure higher than that of the high temperature gas HG by the air compressor (high pressure gas supply means) 28 for cooling. The air is introduced from the air supply header 33 into the support pipe 31 through the air supply pipe 35 and filled into the through hole 18 through the fine holes 31a. Further, the downstream end of the support pipe 31 is closed, and the exhaust pipe is not connected.

Thereby, a part of the low temperature gas LG supplied to the support pipe 31 is supplied from the plurality of pores 31a as the corrosion prevention gas PG and filled into the through hole 18.
According to the above configuration, since the corrosion prevention gas PG is filled in the through hole 18, the support pipe 31 is effectively cooled to protect it from burning and strength reduction, and at the same time, the adjacent surfaces 17a and 17c of the refractory block 17 and chipping. Even if gaps caused by cracks may occur, the corrosion-inhibiting gas PG leaks out from these gaps into the high-temperature gas flow path 10 to prevent the high-temperature gas HG from flowing in. Thereby, it is possible to prevent the corrosive hot gas HG from being brought into contact with the support pipe 31 and the inner peripheral surface of the inner cylinder 15 to be corroded.

[Embodiment 4]
Embodiment 4 of the heat exchanger which concerns on this invention is demonstrated with reference to FIGS. Note that the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The heat exchanger 2 is formed in a casing (cylinder) 42 of the blast furnace gas discharge duct 11 via a fire wall 44 and flows the hot gas HG in the axial direction at the axial center portion, A low-temperature gas flow path 46 for flowing the low-temperature gas LG in the axial direction in a low-temperature gas pipe (long support member) 45 disposed in the fireproof wall 44 at the outer periphery of the high-temperature gas flow path 10; The fire wall device 13 that holds the fire wall 44 is constituted by the low temperature gas pipe 45. A heat insulating material 42 a is attached to the outer peripheral surface of the casing 42. The heat exchanger 2 performs heat exchange between the high-temperature gas HG that flows through the high-temperature gas flow path 10 and the low-temperature gas LG that flows through the low-temperature gas flow path 46.

  As in the first embodiment, the fire wall 44 is divided into a plurality of portions in the circumferential direction of the hot gas flow path 10 and a plurality of portions in the axial direction. The block 17 is configured. The fire wall apparatus 13 for attaching the fireproof block 17 to the inner peripheral surface of the casing 42 has a single through-hole 18 penetrating in the axial direction at a substantially central position in a cross-sectional view of the fireproof block 17 divided in the circumferential direction. The low temperature gas pipes 45 are loosely fitted in the through holes 18 so as to allow thermal deformation to be allowed (thermal deformation allowable gap), and the fireproof block 17 is positioned and held. ing.

  As shown in FIG. 12, similarly to the support pipe 31, four heat transfer fins 36 project along the axial direction on the inner peripheral surface of the low temperature gas pipe 45 in a direction orthogonal to the axial center. Thus, heat can be effectively transferred from the low temperature gas pipe 45 to the cooling gas LG.

  The refractory block 17 has an uneven portion 17d (or step portion) formed on the circumferentially adjacent surface 17c and a step portion 17b (or uneven portion) formed on the axially adjacent surface 17a. . The low temperature gas pipe 45 is supported at its upstream end and downstream end by a plurality of connecting pipes 22 and 26.

  As shown in FIG. 16, an annular air supply header 21 to which the low temperature gas LG is supplied from the blower 23 via the air supply pipe 24 is disposed on the outer peripheral portion of the upstream end of the heat exchanger 2. To the upstream end of the low temperature gas pipe 45 through the connection pipe 22. An annular exhaust header 25 is disposed on the outer peripheral portion of the downstream end of the heat exchanger 2, and the low temperature gas LG is discharged from the low temperature gas pipe 45 to the exhaust header 25 through the connection pipe 26.

In addition, the through-hole 18 and the low temperature gas pipe | tube 45 can also be installed in the fireproof block 17 as shown in FIG.
In the above configuration, the high temperature gas HG is flowed from the upstream side to the downstream side along the axial direction in the high temperature gas flow path 10, and the low temperature gas LG is supplied from the blower 23 via the air supply pipe 24. The low-temperature gas LG is supplied from 21 to the low-temperature gas pipe 45, and the low-temperature gas LG is heated and recovered through the fire wall 44 and the low-temperature gas pipe 45, and the high-temperature gas HG is cooled.

  According to the above configuration, the fire wall 44 and the heat-resistant steel casing 42 and the low-temperature gas pipe 45 having a higher coefficient of thermal expansion than the fire wall 44 are heated and cooled to start thermal expansion and contraction during startup, stop, and operation. However, the low temperature gas pipe 45 is loosely fitted in the through hole 18 of the fireproof block 17 with a heat deformation allowance gap that allows heat deformation and the fireproof wall 44 is positioned and held by the fireproof wall device 13. The thermal stress of 42 and the low temperature gas pipe 45 is not applied to the fireproof block 17. Therefore, cracking and chipping of the fire wall 44 due to thermal deformation can be reduced, and corrosion due to the high temperature gas HG can be prevented.

[Embodiment 5]
In the fifth embodiment, as shown in FIG. 18, a plurality of cooling low-temperature gases LG supplied to the low-temperature gas pipe 45 of the fourth embodiment are ejected from the low-temperature gas pipe 45 into the through hole 18. The pores 45a are formed at a predetermined pitch, and the through holes 18 are filled with a corrosion prevention gas PG (low temperature gas LG). When the air pressure of the low temperature gas LG is lower than that of the high temperature gas HG, the low temperature gas LG is increased by interposing an air compressor (high pressure gas supply means) 28 as an air pressurizer in the air supply pipe 24 (see FIG. 16). .

  That is, a low-temperature gas LG having a pressure higher than that of the high-temperature gas HG is supplied from the supply header 21 to the upstream end of the low-temperature gas pipe 45 and is sent along the low-temperature gas pipe 45. Then, by filling a part of the low temperature gas LG as the corrosion prevention gas PG into the through hole 18 from the pore 45a, the corrosion prevention gas PG can be used even if chipping or cracking or a gap between the adjacent surfaces 17a and 17c occurs. It is possible to prevent the blast furnace gas HG from flowing into the through hole 18 or the inner peripheral surface side of the casing 42 by flowing into the high temperature gas flow path 10 from these gaps, and thereby the low temperature due to the corrosive high temperature gas HG. Corrosion of the inner peripheral surfaces of the gas pipe 45 and the casing 42 can be prevented.

  According to the above configuration, heat can be recovered by the low temperature gas pipe 45 and the low temperature gas pipe 45 can be protected from burning and strength reduction, and the low temperature gas LG can be protected from the low temperature gas pipe 45 into the through hole 18 through the pore 45a. Since the portion is filled, it is possible to prevent overheating of the low-temperature gas pipe 45 and to flow into the high-temperature gas flow path 10 from the chipping, cracking, and gaps formed in the adjacent surfaces 17a and 17c generated in the refractory block 17, thereby causing corrosion. High temperature gas HG can be prevented from flowing into the through-hole 18 and coming into contact with the casing 42, and corrosion can be effectively prevented.

It is a cross-sectional view which shows Embodiment 1 of the heat exchanger which concerns on this invention. It is the elements on larger scale of FIG. It is a longitudinal cross-sectional view of a heat exchanger. A fireproof block and a fireproof wall are shown, (a) is the partial perspective view which extracted a part, (b) is a partial longitudinal cross-sectional view. A fireproof block is shown, (a) is an upper perspective view, (b) is a lower perspective view. The joint part of a fireproof block is shown, (a) is an expanded sectional view of the planar view of the circumferential direction adjacent surface, (b) is a side view which shows an axial direction adjacent surface. The modification 1 of a fireproof block is shown, (a) is an upper perspective view, (b) is a lower perspective view. The other modification 2 of a fireproof block is shown, (a) is an upper perspective view, (b) is a lower perspective view. It is a longitudinal cross-sectional view which shows Embodiment 2 of the heat exchanger which concerns on this invention. It is a partial expanded cross-sectional view of a gas discharge duct. It is the expansion perspective view which notched a part of gas exhaust duct. It is a cross-sectional view showing a modification of the support tube. It is a partial expansion perspective view which shows Embodiment 3 of the heat exchanger which concerns on this invention. It is sectional drawing of the planar view of the gas exhaust duct which shows Embodiment 4 of the heat exchanger which concerns on this invention. It is the elements on larger scale of FIG. It is a longitudinal cross-sectional view of a heat exchanger. It is a partial expanded horizontal sectional view which shows the modification of a heat exchanger. It is a partial expansion perspective view which shows Embodiment 5 of the heat exchanger which concerns on this invention. It is a cross-sectional view showing a conventional heat exchanger. It is a partial expanded cross-sectional view which shows the conventional heat exchanger.

Explanation of symbols

HG High temperature gas LG Low temperature gas (low temperature air)
CG Cooling gas (cooling air)
PG Corrosion prevention gas δ1, δ2 Allowable gap 1 Heat exchanger 2 Heat exchanger 10 Hot gas flow path 11 Gas exhaust duct 12 Casing (outer cylinder)
13 Fire-resistant wall device 14 Fire-resistant wall 15 Inner cylinder 16 Low temperature gas flow path 17 Fire-resistant block 17a Axis direction adjacent surface 17b Stepped portion 17c Circumferential direction adjacent surface 17d Uneven portion 18 Through hole 19 Support rod (long support member)
31 Support tube (long support member)
31a Pore 32 Branch connection pipe 33 Cooling air supply header 42 Casing (tubular body)
44 Fireproof wall 45 Low temperature gas pipe (long support member)
46 Low temperature gas flow path

Claims (5)

A fire wall device that attaches a fire wall to the inner peripheral surface of a cylindrical body that guides corrosive hot gas in the axial direction,
The fire wall is composed of a plurality of fire blocks divided into a plurality of axial directions and circumferential directions of the cylindrical body,
For each block row of refractory blocks arranged along each axial direction, through holes communicating with each refractory block are formed penetrating in the axial direction.
A long support member supported by a cylindrical body is fitted into the through hole, and an allowable gap that allows thermal deformation of the fireproof block and the long support member is provided between the long support member and the through hole. Forming,
The long support member is formed in a hollow shape, and a cooling means for introducing a low-temperature gas higher in pressure than the high-temperature gas is provided in the hollow portion,
A fire wall apparatus, wherein a plurality of fine holes for filling a low temperature gas into the through hole from the long member is formed in the long support member . The step part or the uneven | corrugated | grooved part which mutually engages was formed in at least one of the circumferential direction adjacent surface adjacent to the circumferential direction of a refractory block, and the axial direction adjacent surface adjacent to an axial center direction. Fire wall equipment. A double cylinder structure is formed by an outer cylinder fitted with an annular space in the cylinder, and a hot gas flow path for introducing corrosive high temperature gas is formed in the cylinder, and low temperature gas is introduced into the annular space. A heat exchanger that forms a low temperature gas flow path and performs heat exchange between the high temperature gas in the high temperature gas flow path and the low temperature gas in the low temperature gas flow path,
The heat exchanger according to claim 1 or 2 is provided in the inner skin of the cylinder. A heat exchanger characterized by things. A hot gas channel for guiding corrosive hot gas is formed in the axial center portion of the fire wall attached to the inner peripheral surface of the cylindrical body by the fire wall device , and a low temperature gas is introduced into the fire wall. A heat exchanger in which a low-temperature gas flow path is formed and performs heat exchange between a high-temperature gas in the high-temperature gas flow path and a low-temperature gas in the low-temperature gas flow path,
The fireproof wall is constituted by a fireproof block divided into a plurality in the axial direction and the circumferential direction of the cylindrical body,
The refractory wall device includes a through hole that is formed in the block row of the refractory blocks arranged along each axial direction and is formed in the axial direction so as to communicate with each other. A cooling gas pipe which is fitted through an allowable gap allowing thermal deformation of the block and the long support member and holds the fireproof block and forms a low-temperature gas flow path;
The heat exchanger is characterized in that the low-temperature gas introduced into the cooling gas pipe has a pressure higher than that of the high-temperature gas, and a plurality of pores that fill the through-holes with the low-temperature gas are formed in the cooling gas pipe . At least one of the axial abutment surface which circumferentially adjacent abutment surface and the axial direction adjacent to the circumferential direction of the refractory block, according to claim 4, characterized in that the formation of the stepped portion or the concave-convex portions are engaged with each other Heat exchanger.

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