JP2014082199A - Solid oxide fuel battery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid oxide fuel battery device capable of reducing unevenness in the temperature of a cell stack unit.SOLUTION: A fuel battery cell aggregate 12 comprises: a fuel gas supply pipe 66 equipped with a plurality of cylindrical cells which are erected and disposed in matrix form on the top face of a rectangular parallelepiped hollow gas manifold, and extended in the longer direction of a gas manifold 68 for ejecting a fuel gas into the inside of the gas manifold 68; a heat-depriving unit in which a partition plate 69 disposed along a direction crossing the fuel gas supply pipe 66 at right angles so as to delimit the internal space of the gas manifold 68 in the longer direction and having heat transfer properties, the partition plate 69 being installed so that the amount of heat deprived from the central portion in short direction of the matrix of cylindrical cells among portions of the gas manifold 68 having the cylindrical cells arranged therein is larger than the amount of heat deprived from other than the central portion in short direction; and a heat-imparting unit in which the heat deprived from the heat-depriving unit is used for heat exchange with the fuel gas flowing inside the gas manifold 68 and for heat transfer to other than the central portion in short direction of the gas manifold 68, thereby releasing the heat.

Description

  The present invention relates to a solid oxide fuel cell device that generates power using a fuel gas and an oxidant gas.

Conventionally, as a type of fuel cell, there is a solid oxide fuel cell (hereinafter also referred to as “SOFC”) provided with a plurality of fuel cells operated by a reaction gas. This SOFC is normally provided with a plurality of fuel cells arranged in a power generation chamber densely, supplying air as an oxidant gas supplied into the power generation chamber to the cathode electrode of the fuel cell, The anode electrode of the fuel battery cell is configured to cause a power generation reaction by supplying hydrogen gas as a fuel gas supplied via a gas manifold.

JP 2011-100640 A

  In order to increase the durability of the fuel cell, it is ideal to keep the fuel cell assembly in the power generation chamber at a uniform temperature, but the fuel cell is a component that tends to generate a temperature distribution due to power generation or internal reformation, while the fuel cell Since battery cell assemblies are required to be as dense as possible due to module size restrictions, the center of the fuel cell assembly tends to be hot, and the inner wall of the power generation chamber, especially among the fuel cells other than the central part The fuel cell close to the temperature tends to be relatively low because heat is taken away from the inner wall. Therefore, further soaking is required.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a fuel cell device incorporating a fuel cell assembly formed by closely consolidating solid oxide fuel cells. An object of the present invention is to provide a solid oxide fuel cell device that can reduce temperature unevenness of an assembly.

  In order to solve the above problems, a solid oxide fuel cell device according to the present invention is a solid oxide fuel cell device that generates power using an oxidant gas and a fuel gas, and includes a plurality of matrix-arranged fuel cell devices. A fuel cell and a gas manifold in which the fuel cell is erected so as to supply fuel gas to each of the plurality of fuel cells are provided. The gas manifold includes a matrix of fuel cells. A fuel gas supply pipe that extends in the longitudinal direction and jets fuel gas introduced from the outside of the gas manifold into the gas manifold; and a fuel gas supply pipe that divides the internal space of the gas manifold in the longitudinal direction. A partition plate disposed along the direction in which the fuel gas is ejected is disposed, the partition plate has heat conductivity, and among the gas manifold portions where the fuel cells are arranged, The heat sink that is provided so that the amount of heat taken away from the center part in the short direction of the matrix of the battery cells is greater than the amount of heat taken from other than the center part in the short direction, and the heat taken from the heat sink part inside the gas manifold And a heat application section for releasing heat by utilizing heat exchange with the flowing fuel gas and heat transfer to a portion other than the central portion in the short direction of the gas manifold.

  In the present invention, the partition plate that divides the internal space of the gas manifold has heat conductivity, and the amount of heat taken away from the central portion in the short direction of the matrix of the fuel cells among the portions of the gas manifold where the fuel cells are arranged. Heat exchange between the heat sink provided to increase the amount of heat taken from other than the central portion in the short direction and the fuel gas flowing in the gas manifold from the heat deprived from the heat sink, and the center in the short direction of the gas manifold And a heat imparting part that is used for heat transfer to a part other than the part to dissipate it, so that the heat deprived by the heat removal part is transferred to the entire partition plate and flows along the surface of the partition plate through the heat imparting part. By giving to fuel gas, the temperature of the center part of the top | upper surface of the gas manifold which arranged the fuel cell is reduced. The partition plate is arranged along the direction in which the fuel gas is ejected from the fuel gas supply pipe. Since the fuel gas flows along the surface of the partition plate, the partition plate is separated from the case where the partition does not collide with the partition plate. Since the flow rate of the fuel gas with respect to the plate is increased, the heat exchange efficiency is further increased and the temperature reduction in the central portion is promoted. Further, the heat transferred to the entire partition plate can be released by transferring heat to other than the central portion of the gas manifold in the short direction. Thereby, since the temperature of the center part of the arranged some fuel cell can be reduced, it becomes possible to reduce the temperature nonuniformity inside a fuel cell module.

  Further, in the solid oxide fuel cell device according to the present invention, the partition plate has a convex shape, and the protruding portion of the convex shape is a matrix of the fuel cell among the gas manifold portions where the fuel cells are arranged. It is also preferable that the portion not in contact with the central portion in the short-side direction and projecting is separated from the portion of the gas manifold in which the fuel cells are arranged to constitute the heat removal portion.

  In this preferred embodiment, the protruding portion of the convex shape is in contact with the central portion in the short direction of the matrix of the fuel cells in the gas manifold portion where the fuel cells are arranged, and the protruding portion of the convex shape is not. Since the fuel cells are separated from the gas manifold portion where the fuel cells are arranged, it is possible to reliably remove heat only from the central portion of the plurality of arranged fuel cells. Furthermore, the heat sink is configured by the shape of the partition plate, the temperature of the central portion of the plurality of fuel cells arranged in a simple configuration can be reduced, and temperature unevenness inside the fuel cell module is reduced. It becomes possible.

  Further, in the solid oxide fuel cell device according to the present invention, the heat sink has a conduction hole through which the fuel gas conducts in the protruding portion of the convex shape, and the fuel gas supply pipe ejects gas to the bottom surface side of the gas manifold. It is also preferable to arrange so as to.

  In this preferred embodiment, a conduction hole through which the fuel gas is conducted is provided in the projecting protruding portion of the heat removal portion, and the fuel gas supply pipe is disposed so as to eject gas to the bottom surface side of the gas manifold. As a result, the fuel gas released to the bottom surface flows along the top surface and flows into the conduction hole. As a result, the flow rate of the fuel gas with respect to the partition plate is increased, so that heat exchange is improved, and heat can be further removed from the central portion of the plurality of arranged fuel cells, and the temperature inside the fuel cell module is increased. Unevenness can be reduced.

  Further, in the solid oxide fuel cell device according to the present invention, the partition plate further includes fuel cell cells arranged on the upper ends of both ends of the protruding portion of the partition plate that are not projecting through the heat sink. Reduction that abuts the gas manifold part corresponding to the periphery other than the central part in the short direction of the matrix of the fuel cells so that the gas manifold part is reduced to the periphery other than the center in the short direction of the matrix of the fuel cells. It is also preferable to have a part.

  In this preferred embodiment, the temperature unevenness can be further reduced by reducing the heat taken away from the central portion to the periphery other than the relatively low-temperature central portion.

  According to the present invention, there is provided a solid oxide fuel cell device capable of reducing temperature unevenness of a fuel cell assembly in a fuel cell incorporating a fuel cell assembly composed of densely packed cells. Can do.

It is a perspective view which shows the external appearance of the fuel cell module in embodiment of this invention. It is sectional drawing in the center vicinity of FIG. 1, Comprising: It is sectional drawing which shows the cross section seen from the A direction of FIG. It is sectional drawing in the center vicinity of FIG. 1, Comprising: It is sectional drawing which shows the cross section seen from the B direction of FIG. It is a perspective view which shows the state which removed some outer plates from the casing of FIG. It is a fragmentary sectional view which shows the fuel cell unit used for this embodiment. It is a perspective view which shows the structure of the fuel cell stack in this embodiment. It is sectional drawing which shows the connection part of the fuel cell erected on the fuel gas tank upper board. FIG. 3 is a schematic diagram corresponding to FIG. 2, and is a schematic diagram showing flows of power generation air and combustion gas. It is a perspective view of the fuel gas tank which removed the fuel cell unit of FIG. FIG. 10 is an exploded perspective view in which a fuel gas tank upper plate is removed from the fuel gas tank of FIG. 9. FIG. 3 is an operational diagram showing heat transfer among a fuel cell assembly, a fuel gas tank, and a partition plate in the fuel gas tank in the cross section of FIG. 2. FIG. 3 is an operation diagram showing movement of fuel gas among a fuel cell assembly, a fuel gas tank, and a partition plate in the fuel gas tank in the cross section of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A fuel cell module (solid oxide fuel cell device) according to an embodiment of the present invention will be described with reference to FIG. A fuel cell module 2 shown in FIG. 1 constitutes a part of a solid oxide fuel cell device. The solid oxide fuel cell device includes a fuel cell module 2 and an auxiliary unit (not shown).

  In FIG. 1, the height direction of the fuel cell module 2 is the y-axis direction. The x axis and the z axis are defined along a plane perpendicular to the y axis, the direction along the short direction of the fuel cell module 2 is defined as the x axis direction, and the direction along the longitudinal direction of the fuel cell module 2 is defined as z. Axial direction. The x-axis, y-axis, and z-axis described in FIG. 2 and thereafter are based on the x-axis, y-axis, and z-axis in FIG. Further, the direction along the negative direction of the z axis is the A direction, and the direction along the positive direction of the x axis is the B direction.

  The fuel cell module 2 includes a casing 56 that houses fuel cells (details will be described later), and a heat exchanger 22 that is provided on the upper portion of the casing 56. The inside of the casing 56 is a sealed space. A reformed gas supply pipe 60 and a water supply pipe 62 are connected to the casing 56. On the other hand, a power generation air introduction pipe 74 and a combustion gas discharge pipe 82 are connected to the heat exchanger 22.

  The to-be-reformed gas supply pipe 60 is a pipe line that supplies a to-be-reformed gas for reforming such as city gas into the casing 56. The water supply pipe 62 is a pipe for supplying water used when steam reforming the gas to be reformed. The power generation air introduction pipe 74 is a pipe for supplying power generation air (oxidant gas) for causing a power generation reaction with the reformed fuel gas. The combustion gas discharge pipe 82 is a pipe line for discharging the combustion gas generated as a result of burning the fuel gas after the power generation reaction.

  Next, the inside of the fuel cell module 2 will be described with reference to FIGS. 2 is a cross-sectional view of the fuel cell module 2 as viewed from the direction A in FIG. 1 in the vicinity of the center thereof. 3 is a cross-sectional view of the fuel cell module 2 as viewed from the direction B in FIG. 1 in the vicinity of the center thereof. FIG. 4 is a perspective view showing a state where a part of the casing 56 covering the fuel cell assembly is removed from the fuel cell module 2 shown in FIG.

  As shown in FIGS. 2 to 4, the fuel cell assembly 12 of the fuel cell module 2 is entirely covered with a casing 56. As shown in FIG. 4, the fuel cell assembly 12 as a whole has a substantially rectangular parallelepiped shape that is longer in the A direction than in the B direction. The upper surface on the reformer 20 side and the lower surface on the fuel gas tank 68 (gas manifold) side. , A long side surface extending along the direction A in FIG. 4 and a short side surface extending along the direction B in FIG.

  In the present embodiment, an evaporating mixer (not explicitly shown) for evaporating the water supplied from the water supply pipe 62 is provided inside the reformer 20. The evaporative mixer is heated by the combustion gas to convert water into water vapor, and to mix this water vapor with fuel gas (city gas) that is a reformed gas and air.

  The reformed gas supply pipe 60 and the water supply pipe 62 are both connected to the reformer 20 after being led into the casing 56. More specifically, as shown in FIG. 3, the reformer 20 is connected to an end on the right side in the drawing, which is an upstream end of the reformer 20.

  The reformer 20 is disposed further above the combustion chamber 18 formed above the fuel cell assembly 12. Accordingly, the reformer 20 is heated by the combustion heat of the remaining fuel gas and air after the power generation reaction, and is configured to serve as an evaporative mixer and a reformer that causes a reforming reaction. Has been.

  The upper end of the fuel supply pipe 66 is connected to the downstream end of the reformer 20 (the left end in FIG. 3). The lower end side 66 a of the fuel supply pipe 66 is disposed so as to enter the fuel gas tank 68.

As shown in FIGS. 2 to 4, the fuel gas tank 68 is provided directly below the fuel cell assembly 12. A plurality of small holes 66b are formed in the outer periphery of the lower end side 66a of the fuel supply pipe 66 inserted into the fuel gas tank 68 along the longitudinal direction (A direction). A partition plate 69 having a partition surface 69c perpendicular to the longitudinal direction (A direction) of the fuel gas tank 68 is bent and fixed to face both side surfaces of the fuel gas tank 68 in the short direction, and a pair of side surface fixing pieces 69f fixed. The fuel gas tank 68 includes a bottom surface fixing piece 69d that is fixed to the bottom surface of the fuel gas tank 68. A fuel gas supply pipe through-hole 69h through which the fuel supply pipe 66 passes, and an upper region inside the fuel gas tank 68, , A pair of central convex pieces 69a inscribed in the central portion of the fuel gas tank 68 in the short direction, a central notch 69g sandwiched between the central convex pieces 69a and separated from the fuel gas tank upper plate 68a, and both sides of the central convex pieces 69a And a peripheral recess 69b for allowing the fuel gas to flow therethrough, and is formed so as to be separated from the fuel gas tank upper plate 68a. They are arranged in a position that does not intersect the small hole 66b of the serial fuel supply pipe 66. The fuel gas reformed by the reformer 20 is jetted into the fuel gas tank 68 in the direction along the partition plate 69 through the plurality of small holes 66b, and inside the small chamber of the fuel gas tank 68 partitioned by the partition plate 69. As a result, the fuel gas tank 68 diffuses along the short side direction of the fuel gas tank 68, in other words, along the partition surface 69c, and further flows partially through the peripheral recess 69b of the partition plate 69 in the direction of relaxing the pressure gradient with the adjacent small chamber. The fuel gas tank 68 is supplied uniformly over the entire interior. The fuel gas supplied to the fuel gas tank 68 is a fuel gas flow path inside each fuel cell unit 16 constituting the fuel cell assembly 12 (details will be described later), as indicated by broken line arrows in FIG. The fuel cell unit 16 is raised to reach the combustion chamber 18.

  Next, the fuel cell unit 16 will be described with reference to FIG. FIG. 5 is a partial cross-sectional view showing the fuel cell unit 16 of the present embodiment.

  As shown in FIG. 5, the fuel cell unit 16 includes a fuel cell 84 and inner electrode terminals 86 respectively connected to the vertical ends of the fuel cell 84.

  The fuel cell 84 is a tubular structure extending in the vertical direction, and includes a cylindrical inner electrode layer 90 that forms a fuel gas flow path 88 therein, a cylindrical outer electrode layer 92, an inner electrode layer 90, and an outer side. An electrolyte layer 94 is provided between the electrode layer 92 and the electrode layer 92. The inner electrode layer 90 is a fuel electrode through which fuel gas passes and becomes a (−) electrode, while the outer electrode layer 92 is an air electrode in contact with air and becomes a (+) electrode. The three-phase interface is where ionization reactions (hydrogen ionization and oxygen ionization) take place. The three-phase interface is formed in the fuel cell 84, the interface where the inner electrode layer 90, the electrode catalyst, and the electrolyte layer 94 are in contact with each other, and the outer electrode layer 92, the electrode catalyst, and the electrolyte layer 94 are in contact with each other. Formed at the interface.

  Since the inner electrode terminals 86 attached to the upper end side and the lower end side of the fuel cell unit 16 have the same structure, the inner electrode terminal 86 attached to the lower end side will be specifically described here. The lower part 90 a of the inner electrode layer 90 includes an outer peripheral surface 90 b and a lower end surface 90 c exposed to the electrolyte layer 94 and the outer electrode layer 92. The inner electrode terminal 86 is connected to the outer peripheral surface 90b of the inner electrode layer 90 through a conductive sealing material 96, and is further in direct contact with the lower end surface 90c of the inner electrode layer 90 so as to be electrically connected to the inner electrode layer 90. It is connected to the. A fuel gas passage 98 communicating with the fuel gas passage 88 of the inner electrode layer 90 is formed at the center of the inner electrode terminal 86.

  The inner electrode layer 90 includes, for example, a mixture of Ni and zirconia doped with at least one selected from rare earth elements such as Ca, Y, and Sc, and Ni and ceria doped with at least one selected from rare earth elements. The mixture is formed of at least one of Ni and a mixture of lanthanum garade doped with at least one selected from Sr, Mg, Co, Fe, and Cu.

  The electrolyte layer 94 is, for example, zirconia doped with at least one selected from rare earth elements such as Y and Sc, ceria doped with at least one selected from rare earth elements, lanthanum gallate doped with at least one selected from Sr and Mg, Formed from at least one of the following.

  The outer electrode layer 92 includes, for example, lanthanum manganite doped with at least one selected from Sr and Ca, lanthanum ferrite doped with at least one selected from Sr, Co, Ni and Cu, Sr, Fe, Ni and Cu. It is formed from at least one of lanthanum cobaltite doped with at least one selected from the group consisting of silver and silver.

  Next, the fuel cell stack 14 will be described with reference to FIG. FIG. 6 is a perspective view showing the fuel cell stack 14 of the present embodiment.

  As shown in FIG. 6, the fuel cell stack 14 includes 16 fuel cell units 16, and a lower end side and an upper end side of these fuel cell units 16 are respectively made of ceramic fuel gas tank upper plate 68 a and It is supported by the upper support plate 100. The upper support plate 100 uses, for example, MgO (magnesia) as a material. The fuel gas tank upper plate 68a and the upper support plate 100 are formed with through holes through which the inner electrode terminal 86 can pass.

  Further, a current collector 102 is attached to the fuel cell unit 16. The current collector 102 electrically connects the inner electrode terminal 86 attached to the inner electrode layer 90 that is a fuel electrode and the outer peripheral surface of the outer electrode layer 92 that is the air electrode of the adjacent fuel cell unit 16. To connect.

  Further, the external terminals 104 are connected to the inner electrode terminals 86 at the upper and lower ends of the two fuel cell units 16 located at the ends of the fuel cell stack 14. These external terminals 104 are connected to the external terminals 104 of the fuel cell unit 16 at the end of the adjacent fuel cell stack 14, and all 160 fuel cell units 16 are connected in series. Yes.

  When the fuel cell unit 16 is disposed on the fuel gas tank upper plate 68a, the bush 30 is provided between the inner electrode terminal 86 and the fuel gas tank upper plate 68a. The bush 30 is a member used when the inner electrode terminal 86 of the fuel cell unit 16 is inserted and fixed in the through hole of the fuel gas tank upper plate 68a. That is, the bush 30 is used as a member that fixes the fuel cell unit 16 to the gas manifold.

  FIG. 7 is a partial cross-sectional view showing the connection portion of the fuel cell unit erected on the fuel gas tank upper plate 68a. At the lower end of the fuel cell 84, the solid electrolyte layer and the fuel electrode are exposed. The fuel electrode is electrically connected to the inner electrode terminal 86 via the silver brazing portion 96b or not. A glass seal part 96a is provided on the upper part of the silver brazing part 96b, and the fuel cell 84 and the inner electrode terminal 86 are fixed and hermetically sealed so that fuel gas flowing inside does not leak into the power generation chamber. The inner electrode terminal 86 has a downwardly convex shape, and the protruding portion is inserted into a through hole provided in the fuel gas tank upper plate 68a and fixed by the bush 30 and the glass seal 36 provided on the bush 30. Yes. The bush 30 is an insulating member and prevents an electrical short circuit between the fuel gas tank upper plate 68 and the inner electrode terminal 86. The inner electrode terminal 86 and the lower end of the bush 30 are provided so as to protrude beyond the lower surface of the fuel gas tank upper plate 68a beyond the through hole provided in the fuel gas tank upper plate 68a.

  Next, a structure for supplying power generation air to the inside of the fuel cell module 2 will be described with reference to FIGS. 2 to 4 and 8. FIG. 8 is a schematic diagram corresponding to FIG. 2 and shows the flow of power generation air and combustion gas. As shown in FIG. 8, a heat exchanger 22 is provided above the reformer 20. The heat exchanger 22 is provided with a plurality of combustion gas pipes 70 and a power generation air flow path 72 formed around the combustion gas pipes 70.

  A power generation air introduction pipe 74 is attached to one end side (the right end in FIG. 3) of the upper surface of the heat exchanger 22. With this power generation air introduction pipe 74, power generation air is introduced into the heat exchanger 22 from a power generation air flow rate adjustment unit (not shown).

  As shown in FIG. 2, a pair of outlet ports 76 a of the power generation air flow path 72 is formed on the other end side (the left end in FIG. 3) on the upper side of the heat exchanger 22. The outlet port 76a is connected to a pair of communication channels 76. Further, power generation air supply passages 77 are formed on the outer sides of both sides of the casing 56 of the fuel cell module 2 in the width direction (B direction: short side surface direction).

  Therefore, power generation air is supplied to the power generation air supply path 77 from the outlet port 76 a of the power generation air flow path 72 and the communication flow path 76. The power generation air supply path 77 is formed along the longitudinal direction of the fuel cell assembly 12. Furthermore, in order to blow out the air for power generation toward each fuel cell unit 16 of the fuel cell assembly 12 in the power generation chamber 10 at a position corresponding to the lower side of the fuel cell assembly 12 below the fuel cell assembly 12. A plurality of outlets 78a and 78b are formed. The power generation air blown out from these air outlets 78a and 78b flows upward along the outside of each fuel cell unit 16.

  Subsequently, a structure for discharging combustion gas generated by combustion of fuel gas and power generation air will be described with reference to FIGS. 3 and 8. The combustion gas generated above the fuel cell unit 16 rises in the combustion chamber 18 and reaches the rectifying plate 21. The rectifying plate 21 is provided with an opening 21a, and combustion gas is guided into the opening 21a. The combustion gas that has passed through the opening 21 a reaches the other end side of the heat exchanger 22. In the heat exchanger 22, a plurality of combustion gas pipes 70 are provided for discharging combustion gas generated by combustion of fuel gas and power generation air in the combustion chamber 18. A combustion gas discharge pipe 82 is connected to the downstream end side of these combustion gas pipes 70 so that the combustion gas is discharged to the outside.

  Next, the temperature distribution in the power generation chamber 10 during operation will be described. The fuel cell 84 generates heat due to a power generation reaction. In particular, the central portion of the fuel cell assembly 12 tends to have a shortage of power generation air as compared to the edge portion, so that overvoltage may increase, and heat generation will be greater than that at the edge portion. Further, in the process in which power generation air is blown out from the outlets 78a and 78b and flows upward along the outside of each fuel cell unit 16, heat is taken from each fuel cell unit 16 by convection heat transfer. In the central part of the battery cell unit 16, since the power generation air contacting the fuel battery cell 84 has both a flow rate and a temperature difference reduced by branching and heat exchange in the previous stage, the fuel battery cell 84 in the central part of each fuel cell unit 16. The heat taken away from the fuel cell unit 16 is smaller than that at the edge of each fuel cell unit 16. Moreover, since heat escapes toward the side surface of the casing 56 at both ends of the fuel cell assembly 12 in the A direction, the temperature is lower than that in the central portion of the A direction. With these principles, the fuel cell assembly 12 has a temperature gradient that increases in temperature from the edge to the center in both the A direction and the B direction.

  Next, how the temperature distribution in the fuel cell assembly 12 is relaxed by the partition plate 69 will be described with reference to FIG. When each fuel cell unit 16 generates heat during power generation, a heat sink having a central convex piece 69a in contact with the fuel gas tank upper plate 68a of the partition plate 69 and a peripheral concave portion 69b spaced from the fuel gas tank upper plate 68a is formed. The fuel gas tank 68 takes heat from the central portion in the short direction and does not take heat from the peripheral portion. Therefore, the fuel cell units 16 are arranged in the central portion of the fuel cell units 16 arranged on the fuel gas tank upper plate 68a. The fuel cell unit 16 is cooled. Heat is carried away from the heat removal portion of the partition plate 69 that has been heated to high temperature by two kinds of paths. First, in the process in which the fuel gas blown from the fuel supply pipe 66 flows from the lower part of the heat sink of the partition plate 69 toward the fuel gas passage 98 below the fuel cell unit 16, a part of the fuel gas Flows along the partition surface 69c of the partition plate 69, and heat is carried away by convective heat transfer. The fuel gas moves between the small chambers in the fuel gas tank 68 through the peripheral recess 69b of the heat removal portion of the partition plate 69, so that the fuel gas received and heated at the heat removal portion of the partition plate 69 is retained. In addition, the high heat exchange efficiency of the heat sink is maintained. Secondly, the heat inside the partition plate is directed toward the joint surface (the bottom surface fixing piece 69d and the side surface fixing piece 69f) of the partition plate 69 with respect to the side surface and the bottom surface of the fuel gas tank 68 that is cooler than the heat sink of the partition plate 69. Heat is carried away through the partition surface 69b by conduction. Since the heat transfer area where the bottom face fixing piece 69d and the side face fixing piece 69f are joined to the fuel gas tank 68 is larger than the heat transfer area in the heat removal portion, heat is easily taken from the central portion of the fuel gas tank 68 in the short direction. By forming these two types of heat transfer paths with an appropriate cross-sectional shape of the partition plate, the temperature distribution of the entire fuel cell assembly 12 is relaxed. Further, on the path until the heat removed from the heat removal portion of the partition plate 69 escapes from the side fixing piece 69d, the peripheral portion other than the central portion in the short direction of the fuel gas tank 68, more specifically, the short direction. Since the partition plate 69 is provided with heat transfer pieces 69e that come into contact with the portions of the fuel gas tank upper plate 68a that support the fuel cell units 16 disposed at both ends of the fuel cell unit 16, The high temperature of the central portion can be reduced and heated to both ends having the lowest temperature among the peripheral portions in the short direction. Thereby, the temperature difference between the central portion and the peripheral portion is further reduced.

  Next, the movement of the fuel gas in the fuel gas tank 68 will be described with reference to FIG. As shown in FIG. 12, the fuel gas is ejected from a gas ejection hole provided at the lower end of the fuel supply pipe 66. When the flow rate of the fuel gas in the fuel supply pipe 66 is large, the internal pressure of the fuel gas supply pipe 66 is in a high state. Therefore, the momentum of ejection from the gas ejection hole is strong, whereas the flow rate of the fuel gas is small. Of course, the momentum of the eruption is weakened. When the jetted fuel gas hits the bottom surface of the fuel gas tank 68, the moving direction is changed and the fuel gas rises while flowing along the direction in which the partition plate 69 is provided. In particular, when the fuel gas is hydrogen, the fuel gas rises instantly because its mass is extremely small. Thus, by providing the gas ejection hole at the lower end of the fuel supply pipe 66, the fuel gas can be diffused throughout the small chamber. For this reason, the fuel gas can be made to have a uniform flow rate in the space partitioned by the partition plate 69.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

2: Fuel cell module (solid oxide fuel cell device)
10: Power generation chamber 12: Fuel cell assembly 14: Fuel cell stack 16: Fuel cell unit 18: Combustion chamber 20: Reformer 21: Rectifier plate 21a: Opening 22: Heat exchanger 30: Bush 36: Glass Seal portion 56: casing 56a: casing bottom plate 60: reformed gas supply pipe 62: water supply pipe 66: fuel supply pipe 66a: lower end side 66b: small hole 68: fuel gas tank (gas manifold)
68a: Fuel gas tank upper plate 68b: Fuel gas tank side plate 68c: Through hole 69: Partition plate 69a: Center convex piece 69b: Peripheral concave portion 69c: Partition surface 69d: Bottom fixing piece 69e: Heat transfer piece 69f: Side fixing piece 69g: Center Notch (conduction hole)
69h: Fuel gas supply pipe through hole 70: Combustion gas pipe 72: Power generation air flow path 74: Power generation air introduction pipe 76: Communication flow path 76a: Outlet port 77: Power generation air supply paths 78a, 78b: Air outlet ( Airflow generator)
82: Combustion gas discharge pipe 84: Fuel cell 86: Inner electrode terminal 88: Fuel gas flow path 90: Inner electrode layer 90a: Lower part 90b: Outer peripheral surface 90c: Lower end surface 92: Outer electrode layer 94: Electrolyte layer 96: Seal Material 96a: Glass seal part 96b: Silver brazing part 98: Fuel gas flow path 100: Upper support plate 102: Current collector 104: External terminal

Claims (4)

A solid oxide fuel cell device that generates electricity using oxidant gas and fuel gas,
A plurality of fuel cells arranged in a matrix;
A gas manifold in which the fuel cells are erected to supply fuel gas to each of the plurality of fuel cells, and
Including a casing for enclosing,
Inside the gas manifold,
A fuel gas supply pipe that extends in the longitudinal direction of the matrix of the fuel cells and jets the fuel gas introduced from the outside of the gas manifold into the gas manifold;
A partition plate disposed along the direction in which the fuel gas is ejected from the fuel gas supply pipe so as to partition the internal space of the gas manifold in the longitudinal direction;
The partition plate has heat conductivity,
Of the portions of the gas manifold in which the fuel cells are arranged, the amount of heat taken from the central portion in the short direction of the matrix of the fuel cells is greater than the amount of heat taken from other than the central portion in the short direction. A hot section,
A heat application part for releasing heat taken from the heat removal part by heat exchange with the fuel gas flowing inside the gas manifold and heat transfer to other than the central part in the short direction of the gas manifold; A fuel cell device comprising:
The partition plate has a convex shape,
The protruding portion of the convex shape is in contact with the center portion in the short direction of the matrix of the fuel cells among the portions of the gas manifold where the fuel cells are arranged,
2. The fuel according to claim 1, wherein the non-projecting portion of the convex shape constitutes the heat removal portion by being separated from a portion of the gas manifold in which the fuel cells are arranged. Battery device.
The heat-dissipating part has a conduction hole through which the fuel gas is conducted in the projecting portion of the convex shape, and the fuel gas supply pipe is arranged to eject gas to the bottom surface side of the gas manifold. The fuel cell device according to claim 2.
Further, the heat application part further includes, on the upper ends of both ends of the protruding portion of the convex shape of the partition plate, the part of the gas manifold in which the fuel cells are arranged to take the heat taken through the heat removal part, A reduction portion that contacts a portion of the gas manifold corresponding to the periphery other than the central portion in the short direction of the matrix of the fuel cells so as to reduce to a periphery other than the central portion in the short direction of the matrix of the fuel cells. The fuel cell device according to claim 3, wherein:

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