JP6616718B2 - Fuel cell hot module - Google Patents

Description

  The present invention relates to a fuel cell hot module, and more particularly to a fuel cell hot module that preheats air with an air heat exchanger and supplies the air to a fuel cell via an external manifold.

  As shown in FIG. 4, external manifolds 150 and 155 may be used to supply air to the cathode portion of the cell stack 110 in which a plurality of fuel cells are stacked. When an external manifold structure is used, the cathode pressure loss is smaller than when an internal manifold structure is used, and auxiliary machine loss can be reduced.

  Also, the air A supplied to the cell stack 110 via the external manifold 150 is often preheated in order to keep it close to the temperature necessary for power generation. This preheating of the air A is performed by the air heat exchanger 140. By burning the fuel gas F discharged from the anode part of the cell stack 110 in the combustor 130, introducing it into the air heat exchanger 140 as a high-temperature combustion gas C, and exchanging heat with the air A, Preheat air A. In the fuel cell system, devices that become hot during power generation, such as the cell stack 110, the external manifolds 150 and 155, the combustor 130, the air heat exchanger 140, and the fuel reformer 120, are housed in a common case and are used as hot modules. 100 is configured.

  In the conventional general fuel cell system, the air heat exchanger 140 is installed in the hot module 100 as a device independent of other devices such as the cell stack 110. For example, each figure of patent document 1 discloses a configuration in which the cathode air heat exchanger (44) is provided independently of other devices.

International Publication No. 2014/167674

  As described above, when the supply of air A to the cathode portion of the cell stack 110 is performed by the external manifolds 150 and 155, the operation efficiency of the fuel cell system can be improved by reducing the auxiliary machine loss. By providing the manifolds 150 and 155, the module including the cell stack 110 and the external manifolds 150 and 155 occupies a large volume. Further, when the air heat exchanger 140 that preheats the air supplied to the external manifold 150 is provided independently of other devices in the hot module 100, the entire hot module 100 is increased in size. Increasing the size of the hot module 100 leads to a decrease in operating efficiency and an increase in cost of the hot module 100.

  The problem to be solved by the present invention is a fuel cell hot module of a type in which air preheated by an air heat exchanger is supplied to a cell stack via an external manifold. The object is to provide a battery hot module.

  In order to solve the above problems, a fuel cell hot module according to the present invention includes a cell stack in which a plurality of fuel cells that generate power using fuel gas supplied to an anode and air supplied to a cathode are stacked, and the cell A combustor that combusts the fuel gas discharged from the anode of the stack, a combustion gas passage that distributes the combustion gas generated by burning the fuel gas in the combustor, and an air heat exchanger. The air heat exchanger includes a manifold section that supplies air to the cathode, and an air flow path that supplies air to the manifold section, and the air that is drawn into the combustion gas flow path and flows through the air flow path And a heat exchanging part for exchanging heat between the combustion gas flowing in the combustion gas flow path and disposed in contact with the cell stack Than it is.

  Here, the air heat exchanger may be in contact with the cell stack at a portion where the manifold portion is provided.

  In the heat exchanging portion, the air flowing through the air flow path undergoes heat exchange with the combustion gas flowing upstream of the combustion gas flow path as the air flows downstream toward the manifold portion. It should be a thing.

  In this case, in the heat exchange part, the combustion gas flow path has a plurality of crossing paths that are crossing the air flow path, and the plurality of crossing paths are far from positions close to the manifold part. Are arranged side by side, and the combustion gas exchanges heat with the air flowing through the air flow path while sequentially flowing from the intersection near the manifold to the intersection far from the manifold. It is good to be.

  In the heat exchanging section, the air flow path and the combustion gas flow path may have a cross-flow type plate fin structure.

  In the fuel cell hot module according to the above invention, the manifold part (air manifold) for supplying air to the cathode of the fuel cell constituting the cell stack and the heat exchange part for heating the air supplied to the manifold part are integrated. It has a configured air heat exchanger. Furthermore, the air heat exchanger is not placed separately from the cell stack but is placed in contact with the cell stack. These effects make it possible to reduce the size of the entire hot module compared to a conventional fuel cell hot module, in which the air manifold is configured as an independent member and the air heat exchanger is installed independently from the cell stack. It becomes.

  In addition, the air heat exchanger is placed in contact with the cell stack, so that radiation and heat conduction from the cell stack can be used to heat air in the air heat exchanger in addition to heat exchange with the combustion gas. Can be used. The thermal efficiency of the hot module is increased by the effect of downsizing the hot module and the effect of using the heat from the cell stack. As a result, the operation efficiency of the hot module can be improved.

  Here, when the air heat exchanger is in contact with the cell stack at the portion where the manifold portion is provided, the air heat exchanger is already heated to a certain high temperature by heat exchange with the combustion gas in the heat exchange portion. The air reaching the manifold part is heated in the manifold part by radiation and heat conduction from the cell stack. Thereby, the heat from the cell stack can be efficiently used for heating the air.

  Further, in the heat exchange section, when the air flowing through the air flow path flows downstream toward the manifold section, the heat exchange section receives heat exchange with the combustion gas flowing upstream of the combustion gas flow path. In this case, the air that has already been heated to a certain high temperature on the upstream side of the air flow path and heated to the downstream side is heated with the high-temperature combustion gas flowing on the upstream side of the combustion gas flow path. Therefore, the heat of the combustion gas is more efficient for heating the air than when the high-temperature combustion gas flowing on the upstream side of the combustion gas flow path is used to heat the air that has not yet reached the high temperature downstream of the air flow path. Can be used.

  In this case, in the heat exchange section, the combustion gas flow path has a plurality of cross roads that cross the air flow path, and the plurality of cross roads are arranged side by side from a position close to the manifold section. According to the configuration, the combustion gas exchanges heat with the air flowing through the air flow path while sequentially flowing from the intersection near the manifold to the intersection far from the manifold. According to the configuration, the combustion gas flow path can be constructed so that the air flowing downstream of the air flow path is heated by the high-temperature combustion gas flowing upstream of the combustion gas flow path.

  Further, in the heat exchange section, when the air flow path and the combustion gas flow path have a cross-flow type plate fin structure, the air flowing through the air flow path and the combustion gas flow path flow with a simple configuration. An efficient heat exchange with the combustion gas can be realized.

It is the schematic which shows the structure of the fuel cell hot module concerning one Embodiment of this invention. It is a figure which shows an air heat exchanger, (a) is an external appearance perspective view, (b), (c) is AA sectional drawing and BB sectional drawing in (a), respectively. It is a figure which shows the structure of the heat-source flow path in the said air heat exchanger, (a) is a perspective view, (b), (c) is CC sectional drawing and DD sectional drawing in (a), respectively. It is. It is the schematic which shows the structure of the conventional general fuel cell hot module.

  A fuel cell hot module according to an embodiment of the present invention will be described below with reference to the drawings.

[Configuration of fuel cell hot module]
FIG. 1 shows an outline of a fuel cell hot module (hereinafter sometimes simply referred to as “hot module”) 1 according to an embodiment of the present invention.

  The hot module 1 includes a cell stack 10, a reformer 20, a combustor 30, an air heat exchanger 40, and an outlet manifold 50. These devices 10 to 50 are accommodated in a common case (not shown), and are partitioned as a hot module 1 in the fuel cell system.

  The cell stack 10 is formed by stacking a plurality of fuel cell single cells. A single fuel cell is configured as a solid oxide fuel cell (SOFC) in which an anode (fuel electrode) and a cathode (air electrode) are joined to an electrolyte made of a solid oxide. A cell stack 10 is configured by stacking a plurality of the fuel cell single cells via a separator or the like.

  A fuel gas F is supplied to the anode of each fuel cell single cell constituting the cell stack 10 by an internal manifold system. On the other hand, air A is supplied to the cathode of each fuel cell single cell by an external manifold system. That is, air A is supplied to the cathode of each fuel cell single cell from the manifold portion 41 included in the air heat exchanger 40 described in detail later, and excess air A is recovered in the outlet manifold 50. In the cell stack 10, the fuel flow path Lf through which the fuel gas F flows, and the manifold section 48 of the air heat exchanger 40 and the outlet manifold 50 are connected, and the air flow path La through which the air A flows is a fuel cell single cell. It is arranged parallel to the surface, that is, perpendicular to the stacking direction of the fuel cell single cells.

  Hereinafter, in this specification and each drawing, the stacking direction of the fuel cell single cells is defined as the z direction. The direction in which the fuel flow path Lf and the air flow path La run in the cell stack 10, that is, the direction connecting the manifold portion 48 of the air heat exchanger 40 and the outlet manifold 50 is defined as the x direction. Here, the outlet manifold 50 side is the + x side, and the manifold portion 48 side is the -x side. A direction orthogonal to the x direction and the z direction is taken as a y direction. In each figure, the fuel flow path Lf is indicated by a thin line, the air flow path La is indicated by a diagonal line, and a combustion gas flow path Lc through which a combustion gas C to be described next flows is indicated by a bold line.

  As the reformer 20, a known fuel reformer provided in the fuel cell hot module can be used. The reformer 20 includes a reforming catalyst that generates hydrogen gas from hydrocarbon gas, and reforms a source gas such as city gas or LP gas into a fuel gas F containing hydrogen. The raw material gas introduced into the reformer 20 is preheated in the combustor 30.

  The reformer 20 is in contact with the cell stack 10 and the air heat exchanger 40 in one direction (+ z direction), and is in contact with the combustor 30 in the other direction (−z direction). Since the reformer 20 is in contact with the combustor 30, the heat generated in the combustor 30 is transmitted by radiation and heat conduction, and can be used for the reaction by the reforming catalyst.

  The combustor 30 burns surplus fuel gas F that has not been used for power generation in the cell stack 10. Specifically, the fuel flow path Lf passing through the cell stack 10 and the air flow path La extended from the outlet manifold 50 are merged in the combustor 30. Combustion is performed between the surplus fuel gas F flowing through the fuel flow path Lf and the surplus air A flowing through the air flow path La. The fuel flow path Lf and the air flow path La joined together in the combustor 30 become a combustion gas flow path Lc, and the combustion gas C generated by combustion flows through the combustion gas flow path Lc. The combustion gas C consists of mixed gas, such as a carbon dioxide, water vapor | steam, and air, and becomes very high temperature by combustion. In the drawing, the fuel flow path Lf and the air flow path La in the combustor 30 and the combustion gas flow path Lc are shown as being divided, but this is a display for convenience, and actually, The fuel flow path Lf and the combustion gas flow path Lc are not clearly distinguished from each other, and are integrally continuous, and the concentration of the combustion gas C gradually increases from the upstream side to the downstream side of the combustion gas flow path Lc. Get higher.

  The air heat exchanger 40 is provided in contact with the reformer 20 and the cell stack 10. The structure of the air heat exchanger 40 will be described next. The combustion gas C flowing through the combustion gas flow path Lc drawn from the combustor 30 from the air A taken into the air flow path La from the outside of the hot module 1. The fuel cell is supplied to the cathode of each fuel cell single cell constituting the cell stack 10 while being heated by heat exchange.

[Configuration of air heat exchanger]
The air heat exchanger 40 integrally includes a manifold portion 48 and a heat exchange portion 41. The air A preheated by the heat exchange unit 41 is supplied to the cathode of each fuel cell single cell constituting the cell stack 10 through the manifold unit 48.

  The manifold portion 48 has the same configuration as a known external manifold for air supply, except that the manifold portion 48 communicates with the air flow path La (heated flow path 42) in the heat exchange section 41. That is, it has a space through which air A can flow, and the space communicates with an air flow path La in the cell stack 10 configured as a space between the cathode and separator of each fuel cell single cell. Thereby, air A is supplied from the manifold part 48 to the cathode of each fuel cell single cell.

  A wall surface facing the cell stack 10 side of the manifold portion 48 is an outer wall surface of the entire air heat exchanger 40. And the air heat exchanger 40 is closely_contact | adhered with the end surface of the cell stack 10 in the outer wall surface.

  An air flow path La is provided in the heat exchange unit 41. The air flow path La has an air inlet 43 that communicates with the space outside the hot module 1, and a number of heated flow paths 42 branched from the air inlet 43. In addition, the combustion gas flow path Lc exiting the combustor 30 is drawn into the heat exchanging portion 41 to form a heat source flow path 44. The heated channel 42 and the heat source channel 44 are in contact with each other without communicating with each other, and the combustion gas C flowing through the heat source channel 44 and the air A flowing through the heated channel 42 at the intersection. Heat exchange takes place between them. The combustion gas C flowing through the heat source channel 44 is heated to a high temperature in the combustor 30, and the air A flowing through the heated channel 42 is heated by heat exchange.

  In the actual air heat exchanger 40, the heated flow path 42 and the heat source flow path 44 have an orthogonal plate fin structure. However, in each figure, in order to show the arrangement pattern of the heated flow path 42 and the heat source flow path 44 in the heat exchanging section 41 in an easy-to-understand manner, each is shown as a pipe-like pipe having an equivalent fluid path. Heat exchange takes place at the intersection of the pipes.

  As shown in FIGS. 1 and 2, the heated flow path 42 is configured as an air flow path La that runs parallel to the x direction, and a large number are arranged in the z direction and the y direction. In the example shown in FIG. 2, four rows of heated channels 42 are arranged in the y direction and ten stages in the z direction. All of the channels to be heated 42 communicate with the air inlet 43 on the base end side (−x side), and communicate with the manifold portion 48 on the distal end side (+ x side).

  As will be described later, the heat source flow path 44 has a structure in which the combustion gas flow path Lc is three-dimensionally arranged in the heat exchanging portion 41. In FIG. The path | route through which the gas C flows is shown notionally. That is, the high-temperature combustion gas C supplied from the combustor 30 enters the heat exchange unit 41 from the combustion gas inlet 45 provided at the position closest to the manifold unit 48 of the heat exchange unit 41. Then, in the heat exchanging part 41, a position close to the manifold part 48 is set as the upstream, and the position on the air inlet 43 side far from the manifold part 48 flows through the heat source flow path 44, which is provided on the air inlet 43 side. The combustion gas exit 46 is escaped. Referring to the AA cross-sectional view of FIG. 2B, the combustion gas C causes the heat source flow path 44 to be closer to the manifold portion 48 (+ x side) as c1 row → c2 row → c3 row → c4 row. ) To the side farther from the manifold part 48 (−x side).

  In other words, air A flows through the heated flow path 42 with the air inlet 43 side upstream and the manifold portion 48 side downstream, whereas the combustion gas C is upstream on the manifold portion 48 side and downstream on the air inlet 43 side. As shown in FIG. As described above, the heated channel 42 and the heat source channel 44 intersect each other at a number of locations along the path from upstream to downstream, and perform heat exchange. Therefore, the air A flowing upstream of the heated channel 42 undergoes heat exchange with the combustion gas C flowing downstream of the heat source channel 44, and the air A flowing downstream of the heated channel 42 Heat exchange is performed with the combustion gas C flowing upstream of the passage 44. In other words, as the air A flowing through the heated channel 42 flows downstream, heat exchange is performed with the combustion gas C flowing upstream of the heat source channel 44.

  FIG. 3 three-dimensionally shows the configuration of the heat source flow path 44 through which the combustion gas C flows in the heat exchange section 41 of the air heat exchanger 40. The heat source flow path 44 includes first connection paths a1 to a4, second connection paths b1 to b4, and intersection paths c1 to c4. The first connection paths a <b> 1 to a <b> 4 are flow paths that are provided at positions on the −y side of the heat exchange unit 41 and run parallel to the z direction. Two paths a2 and a3 arranged in the center along the x direction are connected in series. The second connection paths b1 to b4 are flow paths that are provided at positions on the + y side of the heat exchange unit 41 and run in parallel to the z direction. Two paths that are adjacent along the x direction, b1 and b2, and b3 and b4 are connected in series. The intersections c1 to c4 are a plurality of flow paths that run parallel to the y direction, and are arranged side by side in the x direction and the z direction. Each crossing path c1 to c4 communicates between the corresponding first connection path a1 to a4 and the second connection path b1 to b4. The intersections c1 to c4 are arranged in the order of c1, c2, c3, and c4 from the + x direction (side closer to the manifold portion 48) to the −x direction (side far from the manifold portion 48). These correspond to the rows c1 to c4 of the heat source flow path 44 whose cross section is shown in FIG. The number of stages in the z direction of the intersections c1 to c4 is the same as the number of stages of the heated channel 42 (here, ten stages), and the intersections c1 to c4 intersect the heated channel 42 in each stage. Yes. Then, heat exchange between the combustion gas C and the air A is performed at each intersection where the intersections c1 to c4 and the heated channel 42 intersect.

  In the heat source flow path 44 as described above, the combustion gas C introduced from the combustion gas inlet 45 flows through each part in the following order and is discharged from the combustion gas outlet 46. That is, the path of the combustion gas C is a1 → c1 → b1 → b2 → c2 → a2 → a3 → c3 → b3 → b4 → c4 → a4. Since the heat source flow path 44 has such a path, the combustion gas C flowing through the heat source flow path 44 flows from the cross path c1 provided on the + x side (side closer to the manifold section 48) to the −x side (manifold section). Heat exchange is performed with the air A flowing through the heated channel 42 while sequentially flowing to the intersection c4 provided on the side far from 48).

[Heat flow in hot module]
As described above, in the hot module 1 according to the present embodiment, the high-temperature combustion gas C generated by the combustion of the fuel gas F in the combustor 30 is introduced into the heat exchange unit 41 of the air heat exchanger 40. Yes. The air A is preheated by causing heat exchange between the low temperature air A taken in from the outside of the hot module 1 and the high temperature combustion gas C. The preheated air A is supplied to the cathode of each fuel cell single cell constituting the cell stack 10 through the manifold portion 48.

  Here, in the heat exchanging part 41, the air A flowing through the heated flow channel 42 flows into the heated flow channel 42 toward the downstream side, and heat is generated between the combustion gas C flowing upstream of the heat source flow channel 44. By constructing the heated channel 42 and the heat source channel 44 so as to be exchanged, the air A can be preheated with high efficiency. That is, the combustion gas C flowing through the heat source passage 44 is very hot on the upstream side immediately after leaving the combustor 30, but is exchanged with the air A and radiated while flowing downstream. It becomes low temperature. Rather than using the high-temperature combustion gas C flowing upstream of the heat source flow path 44 for heating the low-temperature air A flowing upstream of the heated flow path 42 and not yet heated, it is downstream of the heated flow path 42. Heating the air A can be performed with high efficiency as the heat exchanging part 41 as a whole by using it for heating the air A that has already been heated and is heated to a certain level.

  Here, as shown in FIG. 3, as the heat source flow path 44, a plurality of cross paths c1 to c4 intersecting with the air flow path La are changed from the downstream side (+ x side) to the upstream side (−x side) of the air flow path La. ) And arranged in a plurality of rows, the combustion gas C sequentially flows from the crossing road arranged on the downstream side of the air flow path La to the crossing road arranged on the upstream side (c1 → c2 → c3 → c4). By adopting the form, the heat exchanging portion 41 of the type that heats the air A downstream of the heated channel 42 by the combustion gas C upstream of the heat source channel 44 as described above with a simple configuration. Can be built. Such a heat source flow path 44 and a heated flow path 42 can be realized using a cross-flow type plate fin structure.

  Furthermore, in the hot module 1 according to the present embodiment, the air heat exchanger 40 having the manifold portion 48 is in contact with the cell stack 10. For this reason, heat is transmitted from the cell stack 10 that becomes high temperature during power generation to the air heat exchanger 40, and the heat can be used for preheating the air A in the air heat exchanger 40. Heat transfer proceeds by radiation and heat conduction. In particular, as described above, the air heat exchanger 40 is in contact with the cell stack 10 at the portion where the manifold portion 48 is provided, so that the heat exchange portion 41 has already been heated by heat exchange with the combustion gas C. The air A introduced into the manifold portion 48 at a certain high temperature is heated by the heat from the cell stack 10. For this reason, it is possible to efficiently use the heat from the cell stack 10 for preheating the air A, rather than heating the air A that has not yet reached a high temperature by the heat from the cell stack 10. In particular, as described above, the wall surface of the manifold portion 48 facing the cell stack 10 constitutes the outer wall surface of the entire air heat exchanger 40, and the air heat exchanger 40 is connected to the cell stack on the outer wall surface. By arranging it in close contact with the end face of 10, the heat from the cell stack 10 can be used for preheating the air A in the manifold with little loss.

[Miniaturization of hot modules]
In the hot module 1 according to the present embodiment, an inlet manifold that is an external manifold for introducing the air A into the cell stack 10 is not provided as an independent member, but the manifold portion 48 is integrated with the heat exchange portion 41. Thus, the air heat exchanger 40 is configured as one part. The air heat exchanger 40 is not placed separately from other devices constituting the hot module 1 such as the cell stack 10 but is placed in contact with the cell stack 10. With these configurations, as described above, in addition to the effect that the heat generated from the cell stack 10 can be efficiently used for the preheating of the air A, the effect that the hot module 1 can be reduced in size can be obtained. That is, since the air heat exchanger 40 is not independent of the cell stack 10 and includes the manifold portion 48, the space occupied by the entire hot module 1 can be made smaller than before. As a result, the case surrounding the hot module 1 can also be reduced in size.

  By reducing the size of the hot module 1, it is possible to reduce the amount of heat necessary to maintain the inside of the hot module 1 at a high temperature. As described above, the heat of the combustion gas C and the cell stack 10 is added to the preheating of the air A. In combination with the effect of using the hot module 1, the efficiency of the operation of the hot module 1 can be improved. Moreover, the cost required for manufacturing the hot module 1 and the cost required for operation can be reduced.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 (Fuel Cell) Hot Module 10 Cell Stack 20 Reformer 30 Combustor 40 Air Heat Exchanger 41 Heat Exchanger 42 Heated Channel (Air Channel)
43 Air inlet 44 Heat source flow path (combustion gas flow path)
45 Combustion gas inlet 46 Combustion gas outlet 48 Manifold part 50 Outlet manifolds a1 to a4 First connection paths b1 to b4 Second connection paths c1 to c4 Crossing path A Air C Combustion gas F Fuel La Air flow path Lc Combustion gas flow path Lf Fuel flow path

Claims (6)

A cell stack in which a plurality of fuel cells that generate power using fuel gas supplied to the anode and air supplied to the cathode are stacked;
A combustor for burning fuel gas discharged from the anode of the cell stack;
A combustion gas flow path for circulating a combustion gas generated by burning the fuel gas in the combustor;
A hot module for chromatic and air heat exchanger, and
The air heat exchanger is
A manifold section for supplying air to the cathode;
An air flow path for supplying air to the manifold portion is provided, and the combustion gas flow path is drawn in, and heat exchange is performed between the air flowing through the air flow path and the combustion gas flowing through the combustion gas flow path. A heat exchanging part integrally,
Arranged in contact with the cell stack ,
The air flow path has an air inlet communicating with a space outside the hot module, and a plurality of heated flow paths branched from the air inlet,
The heated channel communicates with the air inlet on the base end side, and communicates with the manifold portion on the distal end side,
The direction to connect the base end side and the tip end side of the channel to be heated is the x direction, the stacking direction of the fuel cell is the z direction, and the direction orthogonal to the x direction and the z direction is the y direction. A plurality of flow paths are arranged side by side in the z direction and the y direction,
The fuel cell hot module , wherein the air flowing through the air flow path undergoes heat exchange with the combustion gas flowing through the combustion gas flow path in the heated flow path . In the heat exchanging section, the air flowing through the heated channel flows between the combustion gas flowing upstream of the combustion gas flow path as the air flows from the air inlet side toward the downstream toward the manifold section. The fuel cell hot module according to claim 1, wherein the fuel cell hot module receives heat exchange. In the heat exchange section, the combustion gas flow path has a plurality of cross paths that are flow paths that intersect the heated flow path, and the plurality of cross paths are arranged from a position close to the manifold section to a position far from the manifold section. in is disposed, the combustion gases from crossing close to the manifold, while in this order to the distant intersection from the manifold, to perform heat exchange with the air flowing through the heated flow channel The fuel cell hot module according to claim 2 .   A cell stack in which a plurality of fuel cells that generate power using fuel gas supplied to the anode and air supplied to the cathode are stacked;
  A combustor for burning fuel gas discharged from the anode of the cell stack;
  A combustion gas flow path for circulating a combustion gas generated by burning the fuel gas in the combustor;
  An air heat exchanger,
  The air heat exchanger is
  A manifold section for supplying air to the cathode;
  An air flow path for supplying air to the manifold portion is provided, and the combustion gas flow path is drawn in, and heat exchange is performed between the air flowing through the air flow path and the combustion gas flowing through the combustion gas flow path. A heat exchanging part integrally,
  Arranged in contact with the cell stack,
  In the heat exchange part, the combustion gas flow path has a plurality of cross roads that are flow paths that cross the air flow path, and the plurality of cross roads are arranged from a position close to the manifold section to a position far from the manifold section. The combustion gas exchanges heat with the air flowing through the air flow path while sequentially flowing from the intersection near the manifold part to the intersection far from the manifold part.
  The fuel cell hot is characterized in that the air flowing through the air flow path undergoes heat exchange with the combustion gas flowing upstream of the combustion gas flow path as the air flows toward the downstream side toward the manifold portion. module. The fuel cell hot module according to any one of claims 1 to 4, wherein the air heat exchanger is in contact with the cell stack at a portion where the manifold portion is provided. In the heat exchange unit, said combustion gas flow path and the air flow path, the fuel cell hot according to any one of claims 1 5, characterized in that taking the plate fin structure crossflow module.

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