JP2007078321A - Heat exchanger of circulating fluidized bed boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger of a circulating fluidized bed boiler capable of improving durability by suppressing vibration from side to side and up and down generated in a heat transfer pipe by increasing rigidity. <P>SOLUTION: A heat transfer pipe array A is structured by bending and arranging a plurality of the heat transfer pipes 31 vertically, and connecting a plurality of parts in a vertical direction by heat transfer pipe connection members 35. A plurality of the heat transfer pipe arrays A are arranged in a horizontal direction, and upper ends and lower ends are connected to upper part support members 37 and lower part support members 39, respectively, to structure a heat transfer pipe block B. A one-body heat transfer pipe support part C is structured by connecting the upper part support members 37 and the lower part support members 39 of the heat transfer pipe block B by block connection members 40, 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger for a circulating fluidized bed boiler that recovers heat from a fluidized material that has become a high temperature by fluidly mixing and combusting a fluidized material (particles) such as sand and a combustion product such as coal.

  A circulating fluidized bed boiler (CFB) is often used as a combustion boiler that incinerates coal, wood, paper sludge, municipal waste, waste tires and the like as fuel. In this circulating fluidized bed boiler, a cyclone for separating the combustion gas and the fluidized material is provided on the outlet side of the fluidized bed furnace (combustor), and the fluidized material separated by the cyclone is sent to an external heat exchanger for heat recovery. Then, while returning to the fluidized bed furnace, the combustion gas separated by the cyclone is sent to the exhaust passage, and heat is recovered by the internal heat exchanger, and after purification, it is discharged outside.

  The external heat exchanger attached to the circulating fluidized bed boiler is provided with a large number of U-shaped heat transfer tubes along the horizontal direction, and the fluidized material heated to a high temperature in the fluidized bed furnace. And fluid (water) flowing inside the heat transfer tube, heat is recovered from the fluidized material and steam is sent to the turbine or the like. In this case, a large number of U-shaped heat transfer tubes are connected in the vertical direction by connecting members to form a heat transfer tube row, and the upper and lower ends of a plurality of heat transfer tube rows arranged in parallel in the horizontal direction. The part is connected to the upper and lower support plates to form a heat transfer tube block, and the plurality of heat transfer tube blocks are suspended from the casing to constitute an external heat exchanger.

  As a support structure of the heat transfer tube in such a heat exchanger, there is one described in Patent Document 1 below. The boiler horizontal heat transfer tube support structure described in Patent Document 1 supports the boiler secondary superheater 2 and the primary superheater horizontal heat transfer tube by a suspension tube suspended from the top of the boiler. In this case, only the lowermost horizontal heat transfer tube of the primary superheater is fixed to the suspension tube, and the other secondary superheaters and the horizontal heat transfer tubes of the primary superheater are slidably held in the tube axis direction. I have to.

JP 2004-060983 A

  In a heat exchanger of a circulating fluidized bed boiler, since a fluidized material having a high temperature is sent to exchange heat with a fluid flowing in the heat transfer tube, it is necessary to firmly support a large number of heat transfer tubes. However, in the external heat exchanger of the conventional circulating fluidized bed boiler described above, a plurality of heat transfer tube blocks are supported by being suspended from the casing, and the support of each heat transfer tube is insufficient. There is a problem that occurs. Moreover, even if it is in the support structure of the boiler horizontal heat exchanger tube described in patent document 1, the horizontal heat exchanger tube of each superheater is supported by the suspension tube suspended from the upper part of the boiler, and support of a heat exchanger tube is carried out. Is insufficient.

  This invention solves such a subject, and provides the heat exchanger of the circulating fluidized bed boiler which aimed at the durability improvement by suppressing the vibration of the upper and lower sides and the right and left which generate | occur | produce in a heat exchanger tube by raising intensity | strength. For the purpose.

  In order to achieve the above object, the heat exchanger of the circulating fluidized bed boiler according to the first aspect of the present invention is a circulating fluidized bed that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. In a heat exchanger of a boiler, a plurality of heat transfer tubes that extend along a horizontal direction and through which a fluid that recovers heat from high-temperature particles can circulate, and the plurality of heat transfer tubes that are arranged side by side along a vertical direction A heat transfer tube connecting member that forms a heat transfer tube row by connecting the heat transfer tube rows at predetermined intervals, and an upper portion that forms upper and lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block It is characterized by comprising a support plate and a lower support plate, and a block connecting member that connects the adjacent upper support plate and lower support plate and integrates the plurality of heat transfer tube blocks together.

  The heat exchanger of the circulating fluidized bed boiler according to the invention of claim 2 is a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes extending along the direction and capable of circulating a fluid that recovers heat from high-temperature particles, and the plurality of heat transfer tubes arranged in parallel along the vertical direction are connected at a predetermined interval. A heat transfer tube connecting member that forms a heat transfer tube row, and an upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block; The heat transfer tube block includes a block reinforcing member that connects the upper support plate and the lower support plate.

  In the heat exchanger of the circulating fluidized bed boiler according to claim 3, the adjacent upper support plate and the lower support plate are connected to each other by a block connecting member, and the plurality of heat transfer tube blocks are integrally configured, and the horizontal direction The upper support plate and the lower support plate in the heat transfer tube block located at each end are connected by the block reinforcing member.

  In a heat exchanger for a circulating fluidized bed boiler according to a fourth aspect of the present invention, the plurality of block reinforcing members intersect with each other to connect the upper support plate and the lower support plate in the heat transfer tube block. Yes.

  The heat exchanger of the circulating fluidized bed boiler according to the invention of claim 5 is a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes extending along the direction and capable of circulating a fluid that recovers heat from high-temperature particles, and the plurality of heat transfer tubes arranged in parallel along the vertical direction are connected at a predetermined interval. A heat transfer tube connecting member that forms a heat transfer tube row, and an upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block; A spacer is provided between the heat transfer tube rows adjacent in the horizontal direction and suppresses horizontal deflection of the heat transfer tubes.

  The heat exchanger of the circulating fluidized bed boiler according to the invention of claim 6 is a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes extending along the direction and capable of circulating a fluid that recovers heat from high-temperature particles, and the plurality of heat transfer tubes arranged in parallel along the vertical direction are connected at a predetermined interval. A heat transfer tube connecting member that forms a heat transfer tube row, and an upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block; A heat transfer tube reinforcing member that is fixed to the upper support plate and the lower support plate and that fits into the heat transfer tube adjacent to the front end portion is provided.

  A heat exchanger for a circulating fluidized bed boiler according to the invention of claim 7 is a heat exchanger for a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes extending along the direction and capable of circulating a fluid that recovers heat from high-temperature particles, and the plurality of heat transfer tubes arranged in parallel along the vertical direction are connected at a predetermined interval. A heat transfer tube connecting member that forms a heat transfer tube row, and an upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block; A plurality of tube row connecting members for connecting the heat transfer tube rows adjacent in the horizontal direction are provided.

  The heat exchanger of the circulating fluidized bed boiler according to the invention of claim 8 is a heat exchanger for a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes that extend along the direction and through which a fluid that recovers heat from high-temperature particles can flow, a sleeve that supports the outer periphery of the plurality of heat transfer tubes, and a direction that intersects the heat transfer tubes A sleeve connecting member that forms a heat transfer tube row by connecting a plurality of the sleeves arranged in parallel along the vertical direction in the shape of a plate, and upper ends of the heat transfer tube rows arranged in parallel in the horizontal direction It comprises an upper support plate and a lower support plate that support the portion and the lower end portion to form a heat transfer tube block.

  The heat exchanger for a circulating fluidized bed boiler according to the invention of claim 9 is a heat exchanger for a circulating fluidized bed boiler that recovers heat from particles heated to high temperature by fluid mixing of the particles and combustion products and burning. A plurality of heat transfer tubes, which are U-shaped along the direction and supported by penetrating the side wall and through which fluid for recovering heat from high-temperature particles can be circulated, are arranged in parallel along the vertical direction. A heat transfer tube connecting member that connects the plurality of heat transfer tubes at a predetermined interval to form a heat transfer tube row, and supports the upper end portions and the lower end portions of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. An upper support plate and a lower support plate forming a heat tube block are provided.

  According to the heat exchanger of the circulating fluidized bed boiler according to the first aspect of the present invention, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, and along the vertical direction. A plurality of heat transfer tubes are connected to each other at a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and an upper support plate and a lower support are provided for the upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. Since the heat transfer tube block is formed by supporting it on the plate, and the adjacent upper support plate and lower support plate are connected by the block connecting member to integrate the plurality of heat transfer tube blocks, each heat transfer tube block is integrated. The strength can be improved as a whole, and the probability that the vibration with each heat transfer tube row is in reverse phase can be increased, and the vibration of the heat transfer tube block can be suppressed, and as a result, the durability can be improved. .

  According to the heat exchanger of the circulating fluidized bed boiler according to the invention of claim 2, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, and along the vertical direction. A plurality of heat transfer tubes are connected to each other at a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and an upper support plate and a lower support are provided for the upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. The heat transfer tube block is supported by the plate, and the upper support plate and the lower support plate in the heat transfer tube block are connected by the block reinforcing member, so the upper support plate and the lower support plate are integrated to improve the overall strength. In addition, the vibration of the heat transfer tube block can be suppressed, and as a result, the durability can be improved.

  According to the heat exchanger for a circulating fluidized bed boiler according to claim 3, a plurality of heat transfer tube blocks are integrally formed by connecting adjacent upper support plates and lower support plates with a block connecting member, Since the upper support plate and the lower support plate in the heat transfer tube block located at the end are connected by the block reinforcing member, the adjacent upper support plate and the lower support plate are connected, and the upper support plate and the lower support plate are connected. Thus, a plurality of heat transfer tube blocks can be reinforced in a frame shape to prevent cross-sectional deformation.

  According to the heat exchanger of the circulating fluidized bed boiler of the invention of claim 4, since the upper support plate and the lower support plate in the heat transfer tube block are connected by crossing the plurality of block reinforcing members, the upper support plate and the lower support plate And the heat transfer tube block can be reinforced in a frame shape to prevent cross-sectional deformation.

  According to the heat exchanger of the circulating fluidized bed boiler according to the invention of claim 5, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, and along the vertical direction. A plurality of heat transfer tubes are connected to each other at a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and an upper support plate and a lower support are provided for the upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. Since the heat transfer tube block is supported by the plate and spacers are installed between the heat transfer tube rows adjacent to each other in the horizontal direction to suppress horizontal vibration of the heat transfer tubes, the heat transfer tubes are integrated as a whole. As a result, it is possible to suppress vertical and horizontal vibrations, and as a result, durability can be improved.

  According to the heat exchanger of the circulating fluidized bed boiler of the invention of claim 6, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, and along the vertical direction. A plurality of heat transfer tubes are connected to each other at a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and an upper support plate and a lower support are provided for the upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. Since the heat transfer tube block is supported by the plate and the heat transfer tube reinforcing member whose tip is fitted to the adjacent heat transfer tube is fixed to the upper support plate and the lower support plate, the heat transfer tubes are integrated as a whole. By improving the strength, vibrations in the vertical and horizontal directions can be suppressed, and as a result, durability can be improved.

  According to the heat exchanger of the circulating fluidized bed boiler of the invention of claim 7, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, and along the vertical direction. A plurality of heat transfer tubes are connected to each other at a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and an upper support plate and a lower support are provided for the upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction. Since the heat transfer tube block is supported by the plate and the heat transfer tube rows adjacent in the horizontal direction are connected by a plurality of tube row connecting members, the heat transfer tube rows are integrated to improve the strength as a whole. Up / down / left / right vibrations can be suppressed, and as a result, durability can be improved.

  According to the heat exchanger of the circulating fluidized bed boiler of the invention of claim 8, a plurality of heat transfer tubes capable of circulating a fluid for recovering heat from high-temperature particles are extended along the horizontal direction, A plurality of heat transfer tubes arranged in parallel in the horizontal direction by connecting the sleeves together by a sleeve connecting member having a plate shape along the direction intersecting the heat transfer tubes, with the outer periphery supported by the sleeves. Since the heat transfer tube block is formed by supporting the upper end portion and the lower end portion of the row on the upper support plate and the lower support plate, each heat transfer tube row is formed by connecting a plurality of heat transfer tubes with a sleeve connecting member, By integrating the heat transfer tube rows and improving the strength as a whole, vibrations in the vertical and horizontal directions can be suppressed, and as a result, durability can be improved.

  According to the heat exchanger of the circulating fluidized bed boiler according to the ninth aspect of the present invention, a plurality of U-shaped heat transfer tubes, in which a fluid for recovering heat from high-temperature particles can circulate, have horizontal end portions along the horizontal direction. The plurality of heat transfer tubes along the vertical direction are connected to each other with a predetermined interval by a heat transfer tube connecting member to form a heat transfer tube row, and a plurality of heat transfer tube rows arranged in parallel in the horizontal direction. Since the heat transfer tube block is formed by supporting the upper end portion and the lower end portion on the upper support plate and the lower support plate, the heat transfer tubes are supported not only by the heat transfer tube connecting members but also by the side walls, so that each heat transfer tube is By integrally improving the strength as a whole, vertical and horizontal vibrations can be suppressed, and as a result, durability can be improved.

  Exemplary embodiments of a heat exchanger for a circulating fluidized bed boiler according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a schematic diagram illustrating a support structure of a heat transfer tube in a heat exchanger for a circulating fluidized bed boiler according to Embodiment 1 of the present invention, and FIG. 2 is a schematic diagram of a heat exchanger for a circulating fluidized bed boiler according to Embodiment 1. FIG. 3 is a schematic diagram showing the connection structure of the heat transfer tubes in the heat exchanger of the circulating fluidized bed boiler of the first embodiment, and FIG. 4 is a schematic configuration diagram showing the circulating fluidized bed boiler of the first embodiment.

  In the circulating fluidized bed boiler according to the first embodiment, as shown in FIG. 4, fluidized bed furnace 11 can be supplied with fluid sand as fluidized material and coal as combusted material, and the coal is combusted inside. As a result, the temperature of the fluidized sand is increased and combustion gas is generated. A cyclone 12 for separating combustion gas and fluidized sand is provided on the outlet side of the fluidized bed furnace 11. A seal pot 14 is connected to the lower part of the cyclone 12 via a conduit 13. The seal pot 14 is connected to an external heat exchanger 16 via a conduit 15. The external heat exchanger 16 is connected to a conduit 17. To the lower part of the fluidized bed furnace 11. The seal pot 14 is connected to the lower part of the fluidized bed furnace 11 through a conduit 18.

  On the other hand, an exhaust passage 19 is connected to the upper part of the cyclone 12, and an internal heat exchanger 20, an air preheater 21, a dust collector 22, and a chimney 23 are connected to the exhaust passage 19. And the front-end | tip part of the air supply pipe 24 extended from the air preheater 20 is connected with the fluidized bed furnace 11 and the external heat exchanger 16, and the air fan 25 is attached to the base end part of the air supply pipe 24. Has been.

  Accordingly, when fluidized sand and coal are supplied to the fluidized bed furnace 11 and high-temperature air heated by the air preheater 21 is introduced from the lower portion through the air supply pipe 24, the fluidized sand Combustion is performed by fluid mixing with coal. The combustion gas heated at a high temperature by the combustion is guided to the cyclone 12 together with the fluidized sand, and is separated into the combustion gas and the fluidized sand by the cyclone 12. When the separated combustion gas is led to the exhaust passage 19 and passes through the internal heat exchanger 20 and the air preheater 21, it exchanges heat with the air introduced into the fluidized bed furnace 11 and the external heat exchanger 16. Then, after removing fly ash and the like through the dust collector 22, it is discharged to the atmosphere by the chimney 23. On the other hand, the high-temperature fluidized sand separated by the cyclone 12 is distributed to the one returned directly to the fluidized bed furnace 11 by the seal pot 14 and the one supplied to the external heat exchanger 16. And in this external heat exchanger 16, after exchanging heat between high-temperature fluidized sand and the fluid (water) which flows through the inside of the heat transfer tube which will be described later, it is returned to the fluidized bed furnace 11.

  In the external heat exchanger 16 of the circulating fluidized bed boiler thus configured, as shown in FIGS. 1 to 3, the heat transfer pipe (superheater pipe or reheat steam pipe) 31 has a U-shape. A large number are arranged along the horizontal direction in a bent state, and one end is connected to the inlet pipe 32 while the other end is connected to the outlet pipe 33 and gathered together. Each of the heat transfer tubes 31 is for recovering heat from high-temperature fluidized sand that is present outside, and three horizontal portions are supported by being suspended from the heat exchanger body.

  That is, each heat transfer tube 31 is fitted into a cylindrical sleeve 34 at a predetermined position and fixed by welding or the like, and the sleeves 34 (heat transfer tubes 31) arranged in parallel along the vertical direction are fixed. A plurality of heat transfer tube arrays A are formed by being connected by the heat transfer tube connecting member 35 at intervals. The upper end portion of each heat transfer tube array A is connected to the upper support plate 37 by the support hardware 36, while the lower end portion is connected to the lower support plate 39 by the support hardware 38, thereby comprising a plurality of heat transfer tubes 31. A plurality of heat transfer tube arrays A are arranged to form a heat transfer tube block B. Further, in each heat transfer tube block B, the sleeve 34 and the heat transfer tube connecting member 35 of the heat transfer tube row A adjacent in the horizontal direction are connected by a knotting plate 40 at a plurality of predetermined positions.

  The adjacent upper support plates 37 are connected by the upper block connecting member 41 and the adjacent lower support plates 39 are connected by the lower block connecting member 42 so that the plurality of heat transfer tube blocks B are integrated. The formed heat transfer tube support C is formed.

  In the present embodiment, the four heat transfer tubes 31 are bent five times in the vertical direction, and the heat transfer tube row A is configured by connecting the 12 locations in the vertical direction, and this heat transfer tube row A has eight rows in the horizontal direction. The heat transfer tube block B is configured by being disposed and the upper end portion and the lower end portion being connected to each other, and the three heat transfer tube blocks B are connected to form an integral heat transfer tube support portion C.

  Three heat transfer tube support portions C are provided in the longitudinal direction of the heat transfer tube 31, and each heat transfer tube support portion C is suspended and supported by an unillustrated external heat exchanger main body using a suspension rod 43 and a bellows 44. ing. That is, a support bracket 45 is fixed to each upper support plate 37 at both ends in the longitudinal direction, and the lower end portion of the suspension bar 43 is connected to each support bracket 45. In FIG. 2, a heat transfer tube support wall 46 is provided on the outer peripheral side of the heat transfer tube 31.

  Therefore, the heat transfer tube support part C in which each heat transfer tube block B is integrally formed by the upper and lower block connecting members 41 and 42 is configured to improve the strength as a whole. Therefore, when vertical and horizontal vibrations act, the stress acting on each heat transfer tube 31 can be reduced by suppressing the vibrations of the upper and lower support plates 37 and 39, and the vibrations of the upper and lower support plates 37 and 39 can be reduced. The maximum stress can be suppressed when the vibrations of the heat transfer tube rows A are in opposite phases.

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the first embodiment, the plurality of heat transfer tubes 31 are bent in the vertical direction, and the plurality of vertical portions are connected by the heat transfer tube connecting member 35. Thus, a heat transfer tube array A is formed, and a plurality of the heat transfer tube arrays A are arranged in the horizontal direction, and the upper end portion and the lower end portion thereof are connected to the upper support member 37 and the lower support member 39, respectively. B is formed, and the upper support members 37 and the lower support members 39 in the heat transfer tube block B are connected by the block connecting members 41 and 42 to form an integrated heat transfer tube support C.

  Accordingly, since the plurality of heat transfer tube blocks B are integrally connected by the upper and lower block connecting members 41, 42, the strength can be improved as the heat transfer tube support portion C, and the vertical and horizontal vibrations acting on each heat transfer tube 31 can be improved. As a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved.

  Further, it is only necessary to integrally connect the plurality of heat transfer tube blocks B by the upper and lower block connecting members 41 and 42, and the durability of the external heat exchanger 16 can be improved with a simple configuration and at a low cost. .

  In addition, although the block connection members 41 and 42 connect the heat transfer tube blocks B by welding, they may be fastened with bolts or the upper and lower support plates 37 and 39 may be stacked and fixed. Further, the support plates 37 and 39 may be integrally formed.

  FIG. 5 is a schematic diagram showing a heat transfer tube support structure in a heat exchanger of a circulating fluidized bed boiler according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger 16 of the circulating fluidized bed boiler of the second embodiment, as shown in FIG. 5, the plurality of heat transfer tubes 31 are fitted into a sleeve 34 having a cylindrical shape and fixed by welding or the like, along the vertical direction. A plurality of heat transfer tube arrays A are formed by connecting the sleeves 34 (heat transfer tubes 31) arranged side by side with the heat transfer tube connecting member 35 at a constant interval. The upper end portion of each heat transfer tube array A is connected to the upper support plate 37 by the support hardware 36, while the lower end portion is connected to the lower support plate 39 by the support hardware 38, thereby comprising a plurality of heat transfer tubes 31. A plurality of heat transfer tube arrays A are arranged to form a heat transfer tube block B. Further, in each heat transfer tube block B, the sleeve 34 and the heat transfer tube connecting member 35 of the heat transfer tube row A adjacent in the horizontal direction are connected by a knotting plate 40 at a plurality of predetermined positions. The adjacent upper support plates 37 are connected by the upper block connecting member 41 and the adjacent lower support plates 39 are connected by the lower block connecting member 42 so that the plurality of heat transfer tube blocks B are integrated. The formed heat transfer tube support C is formed.

  In this embodiment, in the heat transfer tube block B located at each end in the horizontal direction of the heat transfer tube support C, the end of the upper support plate 37 and the end of the lower support plate 39 are block reinforcing members. By being connected by 51, the heat-transfer tube support part C is comprised so that a frame shape may be made.

  Therefore, each heat transfer tube block B is configured by the upper and lower block connecting members 41 and 42 and the left and right block reinforcing members 51 to form a frame-shaped heat transfer tube support portion C, thereby improving the overall strength. Therefore, when vertical and horizontal vibrations act, the stress acting on each heat transfer tube 31 can be reduced by suppressing the vibrations of the upper and lower support plates 37 and 39, and the cross-sectional deformation can be suppressed. Further, the maximum stress can be suppressed when the vibrations of the upper and lower support plates 37 and 39 and the vibrations of the heat transfer tube rows A are in opposite phases.

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the second embodiment, the plurality of heat transfer tubes 31 are arranged to be bent in the vertical direction, and the plurality of vertical portions are connected by the heat transfer tube connecting member 35. Thus, a heat transfer tube array A is formed, and a plurality of the heat transfer tube arrays A are arranged in the horizontal direction, and the upper end portion and the lower end portion thereof are connected to the upper support member 37 and the lower support member 39, respectively. B, and the upper support members 37 and the lower support members 39 in the heat transfer tube block B are connected by the block connecting members 41 and 42, and the end portions of the left and right upper support members 37 and the end portions of the lower support members 39 are connected. By connecting the portions with a block reinforcing member 51, an integral heat transfer tube support portion C having a frame shape is formed.

  Accordingly, since the plurality of heat transfer tube blocks B are connected in a frame shape by the upper and lower block connecting members 41 and 42 and the left and right block reinforcing members 51, the strength can be improved as the heat transfer tube support portion C, and each heat transfer tube It is possible to reduce the stress generated by suppressing the vertical vibration acting on 31 and to suppress the deformation of the cross section. As a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 is improved. Can be improved.

  In addition, the plurality of heat transfer tube blocks B are integrally connected by the upper and lower block connecting members 41 and 42, and the upper and lower support plates 37 and 39 are integrally connected by the left and right block reinforcing members 51. In addition, the durability of the external heat exchanger 16 can be improved at low cost.

  The block reinforcing member 51 connects the upper support member 37 and the lower support member 39 by welding. However, even if the block reinforcing member 51 is fastened with bolts or the support plates 37 and 39 are overlapped and fixed. Good. Further, the block reinforcing member 51 and the support plates 37 and 39 may be integrally formed.

  In the present embodiment, the end portions of the upper support member 37 and the end portions of the lower support member 39 located on the left and right of the heat transfer tube support portion C are connected by the block reinforcing members 51. The block reinforcing member 51 may connect the portion and the end of the lower support member 39. Further, the block reinforcing members may be arranged so as to cross each other so as to connect the upper support plate 37 and the lower support plate 39 in the heat transfer tube block B.

  FIG. 6 is a schematic view showing a heat transfer tube support structure in a heat exchanger of a circulating fluidized bed boiler according to Embodiment 3 of the present invention, and FIG. 7 is a front view showing a spacer. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger 16 of the circulating fluidized bed boiler according to the third embodiment, as shown in FIGS. 6 and 7, the plurality of heat transfer tubes 31 are fitted into a sleeve 34 having a cylindrical shape and fixed by welding or the like. A plurality of heat transfer tube arrays A are formed by connecting the sleeves 34 (heat transfer tubes 31) arranged in parallel along the direction by the heat transfer tube connecting member 35 at a constant interval. The upper end portion of each heat transfer tube array A is connected to the upper support plate 37 by the support hardware 36, while the lower end portion is connected to the lower support plate 39 by the support hardware 38, thereby comprising a plurality of heat transfer tubes 31. A plurality of heat transfer tube arrays A are arranged to form a heat transfer tube block B. Further, in each heat transfer tube block B, the sleeve 34 and the heat transfer tube connecting member 35 of the heat transfer tube row A adjacent in the horizontal direction are connected by a knotting plate 40 at a plurality of predetermined positions.

  In the present embodiment, in each heat transfer tube block B, a spacer 61 that suppresses horizontal shake of each heat transfer tube 31 is provided between the heat transfer tube rows A adjacent in the horizontal direction. The spacer 61 has a vertically long plate shape, and arc-shaped notches 62 are formed on the left and right end faces corresponding to the positions where the heat transfer tubes 31 are disposed. A plurality of spacers 61 are inserted between the heat transfer tube rows A, and the upper end portion is fixed to the upper support plate 37, while the lower end portion is fixed to the lower support plate 39, whereby each notch portion 62 is It will contact the outer peripheral surface of each corresponding heat exchanger tube 31.

  Accordingly, the heat transfer tube block B in which the heat transfer tube rows A are integrally formed by the spacers 61 is configured to improve the strength as a whole. Therefore, when vertical and horizontal vibrations act, by suppressing the vibration of each heat transfer tube row A, it is possible to reduce the stress acting on each heat transfer tube 31, the knot plate 40, the support plates 41, 42, and the like. .

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the third embodiment, the plurality of heat transfer tubes 31 are arranged to be bent in the vertical direction, and the plurality of vertical portions are connected by the heat transfer tube connecting member 35. Thus, a heat transfer tube array A is formed, and a plurality of the heat transfer tube arrays A are arranged in the horizontal direction, and the upper end portion and the lower end portion thereof are connected to the upper support member 37 and the lower support member 39, respectively. A spacer 61 is provided between the heat transfer tube rows A that constitute B and that are adjacent to each other in the horizontal direction and suppress horizontal deflection of each heat transfer tube 31.

  Accordingly, since the plurality of heat transfer tube arrays A are integrally connected by the spacers 61 inserted therebetween, the strength of each heat transfer tube block B can be improved, and the vertical and horizontal vibrations acting on each heat transfer tube 31 can be improved. As a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved.

  In addition, after the heat transfer tube block B is constituted by the heat transfer tube 31, the sleeve 34, the heat transfer tube connecting member 35, the support plates 37, 38, etc., a plurality of spacers 61 are inserted between the heat transfer tube rows A, and the upper and lower ends. Are fixed to the respective support plates 37 and 38, and the spacer 61 can be attached later to support the outer peripheral surface of the heat transfer tube 31, so that the strength of the existing equipment can be easily reinforced.

  The spacer 61 is fixed to the upper support member 37 and the lower support member 39 by welding, but may be fastened with a bolt. Further, although a part of the outer peripheral surface of the heat transfer tube 31 is supported by the spacer 61, the entire outer peripheral surface of the heat transfer tube 31 may be supported by the left and right spacers 61 with the notch portion being semicircular.

  FIG. 8 is a schematic view showing a heat transfer tube support structure in a heat exchanger of a circulating fluidized bed boiler according to Embodiment 4 of the present invention, and FIG. 9 is a front view showing a heat transfer tube reinforcing member. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger 16 of the circulating fluidized bed boiler according to the fourth embodiment, as shown in FIG. 8, the plurality of heat transfer tubes 31 are fitted into a sleeve 34 having a cylindrical shape and fixed by welding or the like, along the vertical direction. A plurality of heat transfer tube arrays A are formed by connecting the sleeves 34 (heat transfer tubes 31) arranged side by side with the heat transfer tube connecting member 35 at a constant interval. The upper end portion of each heat transfer tube array A is connected to the upper support plate 37 by the support hardware 36, while the lower end portion is connected to the lower support plate 39 by the support hardware 38, thereby comprising a plurality of heat transfer tubes 31. A plurality of heat transfer tube arrays A are arranged to form a heat transfer tube block B. Further, in each heat transfer tube block B, the sleeve 34 and the heat transfer tube connecting member 35 of the heat transfer tube row A adjacent in the horizontal direction are connected by a knotting plate 40 at a plurality of predetermined positions.

  In this embodiment, in each heat transfer tube block B, the upper heat transfer tube reinforcing member 71 and the lower heat transfer tube are fixed to the upper support plate 37 and the lower support plate 39 and fitted to the adjacent heat transfer tubes 31. A reinforcing member 72 is provided. The heat transfer tube reinforcing members 71 and 72 have substantially the same shape, the base end portion is linear, and arc-shaped cutout portions 73 and 74 that fit into the plurality of heat transfer tubes 31 are formed continuously at the distal end portion. Yes. The notches 73 and 74 are formed so as to be displaced vertically corresponding to the mounting height of the heat transfer tubes 31 of each heat transfer tube array A, and the notches 73 are formed along the longitudinal direction of the heat transfer tube reinforcing members 71 and 72. , 74 are alternately formed.

  The base end portion of the upper heat transfer tube reinforcing member 71 is fixed to the upper support plate 37 by welding, and the notches 73 and 74 are fitted to the outer peripheral surfaces of the plurality of heat transfer tubes 31, while the lower support plate 39 has a lower portion. The base end portion of the heat transfer tube reinforcing member 72 is fixed by welding, and the notches 73 and 74 are fitted to the outer peripheral surfaces of the plurality of heat transfer tubes 31.

  Accordingly, the heat transfer tube block B supports the heat transfer tubes 31 by the upper and lower heat transfer tube reinforcing members 71 and 72, thereby improving the overall strength. Therefore, when vertical and horizontal vibrations act, the stress acting on each heat transfer tube 31 can be reduced by suppressing the vibration of each heat transfer tube 31 and the heat transfer tube row A.

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the fourth embodiment, the plurality of heat transfer tubes 31 are arranged to be bent in the vertical direction, and a plurality of locations in the vertical direction are connected by the heat transfer tube connecting member 35. Thus, a heat transfer tube array A is formed, and a plurality of the heat transfer tube arrays A are arranged in the horizontal direction, and the upper end portion and the lower end portion thereof are connected to the upper support member 37 and the lower support member 39, respectively. Heat transfer tube reinforcing members 71 and 72 that constitute B and are fitted to the plurality of heat transfer tubes 31 adjacent to the upper and lower support plates 37 and 39 are provided.

  Accordingly, since the heat transfer tubes 31 at the ends of the heat transfer tube rows A are integrally supported by the heat transfer tube reinforcing members 71 and 72, the strength of each heat transfer tube block B can be improved, and the heat transfer tubes 31 can act on the heat transfer tubes 31. The stress generated by suppressing the vertical and horizontal vibrations can be reduced, and as a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved.

  Further, after the heat transfer tube block B is constituted by the heat transfer tube 31, the sleeve 34, the heat transfer tube connecting member 35, the support plates 37 and 38, the upper and lower heat transfer tube reinforcing members 71 and 72 are fixed to the support plates 37 and 39. In addition, the heat transfer tube reinforcing members 71 and 72 can be attached later to support the outer peripheral surface of the heat transfer tube 31, and the strength of the existing equipment can be easily reinforced.

  FIG. 10 is a schematic diagram showing a heat transfer tube support structure in a heat exchanger of a circulating fluidized bed boiler according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger of the circulating fluidized bed boiler of the fifth embodiment, as shown in FIG. 10, the plurality of heat transfer tubes 31 are fitted into a cylindrical sleeve 34 and fixed by welding or the like, along the vertical direction. A plurality of heat transfer tube arrays A are formed by connecting the sleeves 34 (heat transfer tubes 31) arranged side by side with a heat transfer tube connecting member 35 at a constant interval. The upper end portion of each heat transfer tube array A is connected to the upper support plate 37 by the support hardware 36, while the lower end portion is connected to the lower support plate 39 by the support hardware 38, thereby comprising a plurality of heat transfer tubes 31. A plurality of heat transfer tube arrays A are arranged to form a heat transfer tube block B.

  In this embodiment, in the heat transfer tube block B, each sleeve 34 in the heat transfer tube row A and each heat transfer tube connecting member 35 in the adjacent heat transfer tube row A are all connected by the knotting plate 40 as the tube row connecting member. Linked in position.

  Therefore, in each heat transfer tube block B, the adjacent heat transfer tube rows A are connected by a large number of knotting plates 40, whereby the overall strength is improved. In this case, the vertical position of each heat transfer tube 31 in the adjacent heat transfer tube row A is shifted, and the vertical position of each knotting plate 40 in the adjacent heat transfer tube row A is also shifted, so that the entire surface in the heat transfer tube block B is uniform. As a result, the strength is improved. Therefore, when vertical and horizontal vibrations act, the stress acting on each heat transfer tube 31 can be reduced by suppressing the vibration of each heat transfer tube 31.

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the fifth embodiment, the plurality of heat transfer tubes 31 are arranged to be bent in the vertical direction, and a plurality of locations in the vertical direction are connected by the heat transfer tube connecting member 35. Thus, a heat transfer tube array A is formed, and a plurality of the heat transfer tube arrays A are arranged in the horizontal direction, and the upper end portion and the lower end portion thereof are connected to the upper support member 37 and the lower support member 39, respectively. The sleeve 34 and the heat transfer tube connecting member 35 in each adjacent heat transfer tube array A are connected by the knotting plate 40 at all positions.

  Therefore, since each adjacent heat transfer tube row A is connected at a plurality of positions by a large number of knotting plates 40, the strength can be improved as each heat transfer tube block B, and the upper and lower and left and right acting on each heat transfer tube 31 can be improved. The stress generated by suppressing the vibration can be reduced, and as a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved.

  FIG. 11-1 is a front view illustrating a heat transfer tube support structure in a heat exchanger for a circulating fluidized bed boiler according to Embodiment 6 of the present invention, and FIG. 11-2 is a heat exchange for the circulating fluidized bed boiler according to Embodiment 6. It is a side view showing the support structure of the heat exchanger tube in an oven. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger of the circulating fluidized bed boiler of Example 6, as shown in FIGS. 11- and 11-2, the plurality of heat transfer tubes 31 are fitted into a cylindrical sleeve 34 and fixed by welding or the like. The sleeves 34 (heat transfer tubes 31) arranged in parallel along the vertical direction are connected to each other by a heat transfer tube connecting member 81 at a constant interval. In the present embodiment, the heat transfer tube connecting member 81 has a plate shape along the direction intersecting the heat transfer tube 31.

  As described above, in the heat exchanger for the circulating fluidized bed boiler according to the sixth embodiment, the plurality of heat transfer pipes 31 are bent in the vertical direction, and the sleeves 34 are fixed to a plurality of locations in the vertical direction. 34 is connected by a heat transfer tube connecting member 81 along a direction intersecting with the heat transfer tube 31 to constitute a heat transfer tube row A.

  Accordingly, since the heat transfer tubes 31 adjacent to each other in the vertical direction are connected by the heat transfer tube connecting member 81 along the direction intersecting the heat transfer tubes 31, the strength of each heat transfer tube row A can be improved. It is possible to reduce the stress generated by suppressing the vertical and left and right vibrations acting on the heat exchanger, and as a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved.

  FIG. 12 is a schematic diagram of a heat exchanger for a circulating fluidized bed boiler according to Embodiment 7 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the external heat exchanger of the circulating fluidized bed boiler of the seventh embodiment, as shown in FIG. 12, the plurality of heat transfer tubes 31 are supported by three heat transfer tube support portions C and the end portions are heat transfer tube support walls. It is supported by passing through the side wall 46a of 46.

  Thus, in the heat exchanger of the circulating fluidized bed boiler of Example 7, the heat transfer tubes 31 are supported at a plurality of positions in the longitudinal direction, and the heat exchanger as a whole can improve the strength, The stress generated by suppressing the vertical and horizontal vibrations acting on each heat transfer tube 31 can be reduced, and as a result, the durability of not only the heat transfer tube 31 but also the external heat exchanger 16 can be improved. .

  In each of the above-described embodiments, in order to suppress the vibration of the heat transfer tube 31, the heat transfer tube connection members 35 and 81, the knot plate (tube row connection member) 40, the block connection members 41 and 42, and the like are provided. A damper or the like may be provided on the hanging rod 42 to absorb vibration.

  The heat exchanger of the circulating fluidized bed boiler according to the present invention is intended to improve the durability by suppressing the vertical and horizontal vibrations generated in the heat transfer tube by increasing the strength, and is installed in any place. The present invention can also be applied to a circulating fluidized bed boiler heat exchanger.

It is the schematic showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 1 of this invention. It is the schematic of the heat exchanger of the circulating fluidized bed boiler of Example 1. FIG. It is the schematic showing the connection structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler of Example 1. FIG. 1 is a schematic configuration diagram illustrating a circulating fluidized bed boiler of Example 1. FIG. It is the schematic showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 2 of this invention. It is the schematic showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 3 of this invention. It is a front view showing a spacer. It is the schematic showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 4 of this invention. It is a front view showing a heat exchanger tube reinforcement member. It is the schematic showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 5. FIG. It is a front view showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler which concerns on Example 6 of this invention. It is a side view showing the support structure of the heat exchanger tube in the heat exchanger of the circulating fluidized bed boiler of Example 6. FIG. It is the schematic of the heat exchanger of the circulating fluidized bed boiler which concerns on Example 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fluidized bed furnace 12 Cyclone 16 External heat exchanger 19 Exhaust passage 24 Air passage 31 Heat transfer tube 34 Sleeve 35,81 Heat transfer tube connection member 37 Upper support plate 39 Lower support plate 40 Tie plate (tube row connection member)
41 Upper block connecting member 42 Lower block connecting member 43 Hanging rod 46 Heat transfer tube support portion 46a Side wall 51 Block reinforcing member 61 Spacer 71 Upper heat transfer tube reinforcing member 72 Lower heat transfer tube reinforcing member A Heat transfer tube row B Heat transfer tube block C Heat transfer tube support Part

Claims (9)

  In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which a fluid can circulate, a plurality of heat transfer tubes arranged in parallel along the vertical direction, and a heat transfer tube connecting member that forms a heat transfer tube array by connecting the heat transfer tubes at a predetermined interval, and a horizontal direction. An upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of installed heat transfer tube rows to form a heat transfer tube block, and the adjacent upper support plate and lower support plate are connected to each other. A heat exchanger for a circulating fluidized bed boiler, comprising a block connecting member that integrates a plurality of the heat transfer tube blocks.   In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which a fluid can circulate, a plurality of heat transfer tubes arranged in parallel along the vertical direction, and a heat transfer tube connecting member that forms a heat transfer tube array by connecting the heat transfer tubes at a predetermined interval, and a horizontal direction. An upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of installed heat transfer tube rows to form a heat transfer tube block, and the upper support plate and the lower support plate in the heat transfer tube block. A heat exchanger for a circulating fluidized bed boiler comprising a block reinforcing member to be connected.   The heat exchanger of the circulating fluidized bed boiler according to claim 2, wherein the upper support plate and the lower support plate adjacent to each other are connected by a block connecting member, and a plurality of the heat transfer tube blocks are integrally formed, and the horizontal direction A heat exchanger for a circulating fluidized bed boiler, wherein the upper support plate and the lower support plate in the heat transfer tube block located at each end are connected by the block reinforcing member.   The heat exchanger of the circulating fluidized bed boiler according to claim 2, wherein the plurality of block reinforcing members intersect with each other to connect the upper support plate and the lower support plate in the heat transfer tube block. Heat exchanger for circulating fluidized bed boiler.   In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which a fluid can circulate, a plurality of heat transfer tubes arranged in parallel along the vertical direction, and a heat transfer tube connecting member that forms a heat transfer tube array by connecting the heat transfer tubes at a predetermined interval, and a horizontal direction. An upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of installed heat transfer tube rows to form a heat transfer tube block, and are positioned between the heat transfer tube rows adjacent in the horizontal direction. A heat exchanger for a circulating fluidized bed boiler, comprising a spacer for suppressing horizontal deflection of a heat transfer tube.   In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which a fluid can circulate, a plurality of heat transfer tubes arranged in parallel along the vertical direction, and a heat transfer tube connecting member that forms a heat transfer tube array by connecting the heat transfer tubes at a predetermined interval, and a horizontal direction. An upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of installed heat transfer tube rows to form a heat transfer tube block, and a distal end portion fixed to the upper support plate and the lower support plate. A heat exchanger for a circulating fluidized bed boiler, comprising: a heat transfer tube reinforcing member fitted to the adjacent heat transfer tube.   In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which a fluid can circulate, a plurality of heat transfer tubes arranged in parallel along the vertical direction, and a heat transfer tube connecting member that forms a heat transfer tube array by connecting the heat transfer tubes at a predetermined interval, and a horizontal direction. An upper support plate and a lower support plate that support upper end portions and lower end portions of the plurality of installed heat transfer tube rows to form a heat transfer tube block, and a plurality of tubes that connect the heat transfer tube rows adjacent in the horizontal direction. A heat exchanger for a circulating fluidized bed boiler comprising a row connecting member.   In a heat exchanger of a circulating fluidized bed boiler that recovers heat from particles that have become hot by fluidizing and combusting particles and combustion products, the heat is recovered from the hot particles that are extended along the horizontal direction. A plurality of heat transfer tubes through which fluid can flow, a sleeve that supports the outer periphery of the plurality of heat transfer tubes, and a plurality of tubes arranged side by side along the vertical direction in a plate shape that intersects the heat transfer tubes A sleeve connecting member that connects the sleeves together to form a heat transfer tube row, and an upper support that forms upper and lower ends of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block A circulating fluidized bed boiler heat exchanger comprising a plate and a lower support plate.   In a circulating fluidized bed boiler heat exchanger that recovers heat from particles heated to high temperature by fluidly mixing and burning particles and combustion products, the tip penetrates the side wall in a U-shape along the horizontal direction And a plurality of heat transfer tubes through which a fluid for recovering heat from high-temperature particles can circulate and the plurality of heat transfer tubes arranged in parallel along the vertical direction are connected to each other at a predetermined interval. A heat transfer tube connecting member that forms a row, and an upper support plate and a lower support plate that support the upper end portion and the lower end portion of the plurality of heat transfer tube rows arranged in parallel in the horizontal direction to form a heat transfer tube block. A heat exchanger for a circulating fluidized bed boiler.

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