JP2018081773A - Solid oxide fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid oxide fuel cell capable of ensuring good structural reliability, while suppressing increase in manufacturing cost.SOLUTION: An anode gas manifold 36 includes a body 36a and a top plate 36b. The body 36a has a placement part 36a1, and a folding part 36a2 formed at the periphery. In the manifold 36, the folding part 36a2 is folded by mechanical processing while placing the top plate 36b on the placement part 36a1 of the body 36a, and the body 36a and the top plate 36b are fixed. A crimp surface is formed between the folding part 36a2 of the body 36a and the periphery 36b2 of the top plate 36b, and a diffusion layer 36c is formed via heating treatment. In this way, the body 36a and the top plate 36b of the manifold 36 are fixed rigidly by mechanical processing, while suppressing increase in manufacturing cost, and good sealability can be realized by formation of the diffusion layer 36c.SELECTED DRAWING: Figure 6

Description

  The present invention provides a solid oxide fuel cell cylindrical cell that generates power from a power generation reaction by being supplied with a fuel gas and an oxidant gas, and supplies the fuel gas or oxidant gas to a plurality of solid oxide fuel cell cylindrical cells. And a solid oxide fuel cell including the manifold.

  Conventionally, for example, a fuel cell disclosed in the following Patent Document 1 and a fuel cell device disclosed in the following Patent Document 2 are known. These conventional fuel cells and fuel cell devices (hereinafter simply referred to as “conventional devices”) are solid oxide fuel cells (SOFCs), and include a plurality of cylindrical cells. ing. The plurality of cylindrical cells are erected by a manifold and supplied with fuel gas or oxidant gas from the manifold.

  The manifold disclosed in Patent Document 1 is composed of a box-shaped main body and a plate-shaped bottom plate for fixing a solid oxide fuel cell, and the main body and the bottom plate are once melted by heat treatment. It is designed to be joined using a glass material. Moreover, the gas tank (manifold) disclosed in Patent Document 2 below includes a box-shaped casing and a top plate that supports the solid oxide fuel cell from below, and the casing and the top plate are welded. It comes to be joined by.

JP 2007-180000 A JP 2012-89294 A

  By the way, in the solid oxide fuel cell, its operating temperature is relatively high, and the difference between the temperature of the manifold during operation and the temperature of the manifold during stoppage becomes large. In general, when the temperature changes, the expansion and contraction of the metal material is greatly different from the expansion and contraction of the glass material, and the expansion and contraction of the metal material is often larger. As a result, in the manifold disclosed in Patent Document 1, there is a possibility that the glass material that joins the main body and the bottom plate may be damaged when the operation and the stop are repeated, and it is possible to ensure reliability in terms of joining strength. difficult. In manufacturing, the glass material is in the form of a paste. In this case, in order to ensure the fluidity of the paste, the paste needs to contain a solvent and a dispersant in addition to the glass material. As a result, the concentration of the solid component, that is, the glass material in the paste cannot be increased, and as a result, there is a risk that the shrinkage at the time of heat treatment (at the time of firing) becomes large and the sealing performance of the joint portion of the main body and the bottom plate is lowered. It is difficult to ensure reliability in terms of sealing performance.

  With respect to these points, when the main body (casing) and the top plate are welded as in the manifold (gas tank) disclosed in Patent Document 2, the mechanical strength and the sealing performance at the joint portion are sufficient. Secured. However, when the main body (casing) and the top plate are welded, it is necessary to weld the entire circumference of the top plate, which increases the number of manufacturing steps, which may increase the manufacturing cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a solid oxide fuel cell capable of ensuring good structural reliability while suppressing an increase in manufacturing cost. And

  In order to solve the above problems, the invention of a solid oxide fuel cell according to claim 1 includes an inner electrode layer formed in a cylindrical shape, an outer electrode layer laminated outside the inner electrode layer, and an inner electrode. An electrolyte layer formed between the outer electrode layer and the outer electrode layer, and a plurality of solid oxide fuel cell cylindrical cells that are supplied with the fuel gas and the oxidant gas to perform a power generation reaction, and a plurality of solid oxides A solid body having an upright portion for standing a solid fuel cell tubular cell, and a box-shaped manifold for supplying fuel gas or oxidant gas to the solid oxide fuel cell tubular cell An oxide fuel cell, wherein the manifold is formed in a bottomed box shape having an opening, and a main body formed with a protrusion protruding from the end on the opening side toward the outer periphery or the inner periphery, A lid member that covers the entire opening of the main body, and the lid member is The other peripheral portion of the peripheral portion of the main body and the peripheral portion of the lid member is formed on one peripheral portion of the peripheral portion of the main body and the peripheral portion of the lid member in a state in contact with the protruding portion of the body And having a folded portion that forms a pressure-bonding surface in which one peripheral edge portion and the other peripheral edge portion are pressure-bonded to each other.

  In the solid oxide fuel cell of the present invention, the main body and the lid member can be fixed by machining because the manifold has the folded portion. This eliminates the need for welding to melt the material in order to join the main body and the lid member, makes it possible to manufacture the manifold very easily, and to ensure good mechanical strength and sealability. it can. As a result, an increase in manufacturing cost can be suppressed, and a solid oxide fuel cell with high structural reliability can be manufactured.

1 is a system diagram of a solid oxide fuel cell common to each embodiment of a solid oxide fuel cell according to the present invention. It is sectional drawing for demonstrating the solid oxide fuel cell stack of FIG. It is a figure for demonstrating the structure of the solid oxide fuel cell cylindrical cell of FIG. 2 electrically adjacent. FIG. 3 is a cross-sectional view for explaining the configuration of the anode gas manifold of FIG. 2 according to the first embodiment of the solid oxide fuel cell according to the present invention. FIG. 5 is a cross-sectional view for explaining an assembled state of the anode gas manifold of FIG. 4. FIG. 6 is a view for explaining a state where a plurality of solid oxide fuel cell cylindrical cells are erected on the anode gas manifold of FIG. 5. FIG. 3 is a cross-sectional view for explaining a configuration of an anode gas manifold of FIG. 2 according to a second embodiment of the solid oxide fuel cell according to the present invention. It is sectional drawing for demonstrating the assembly state of the anode gas manifold of FIG. FIG. 9 is a view for explaining a state in which a plurality of solid oxide fuel cell cylindrical cells are erected on the anode gas manifold of FIG. 8. FIG. 5 is a cross-sectional view for explaining a configuration of an anode gas manifold of FIG. 2 according to a first modification of the second embodiment of the solid oxide fuel cell according to the present invention. It is sectional drawing for demonstrating the assembly state of the anode gas manifold of FIG. FIG. 12 is a view for explaining a state where a plurality of solid oxide fuel cell cylindrical cells are erected on the anode gas manifold of FIG. 11. FIG. 6 is a cross-sectional view for explaining an assembled state of the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 6 is a cross-sectional view for explaining an assembled state in which a glass layer is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 9 is a cross-sectional view for explaining an assembled state in which a compression seal is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 6 is a cross-sectional view for explaining an assembled state of the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 6 is a cross-sectional view for explaining an assembled state in which a glass layer is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 9 is a cross-sectional view for explaining an assembled state in which a compression seal is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 6 is a cross-sectional view for explaining an assembled state of the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 6 is a cross-sectional view for explaining an assembled state in which a glass layer is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 9 is a cross-sectional view for explaining an assembled state in which a compression seal is provided between the main body and the top plate of the anode gas manifold of FIG. 2 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining an assembled state in which a glass layer is provided between the bent portion of the main body of the anode gas manifold of FIG. 2 and the top plate according to another modification of the solid oxide fuel cell according to the present invention. is there. FIG. 7 is a cross-sectional view for explaining a case where a bent portion of a main body of the anode gas manifold of FIG. 2 is previously bent according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining a case where the opening of the main body of the anode gas manifold of FIG. 6 is on the lower side according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining a case where the opening of the main body of the anode gas manifold of FIG. 6 is on the left and right according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining a case where the top plate (lid member) of the anode gas manifold of FIG. 6 is box-shaped, according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining a folded portion of the anode gas manifold of FIG. 6 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view for explaining a folded portion of the anode gas manifold of FIG. 6 according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view illustrating a case where a plurality of folded portions of the anode gas manifold of FIG. 6 are folded back according to another modification of the solid oxide fuel cell according to the present invention. FIG. 7 is a cross-sectional view illustrating a case where a plurality of folded portions of the anode gas manifold of FIG. 6 are folded back according to another modification of the solid oxide fuel cell according to the present invention.

(First embodiment)
<Solid oxide fuel cell system 1>
As shown in FIG. 1, the solid oxide fuel cell system 1 includes a power generation unit 10 and a hot water storage tank 21. The power generation unit 10 includes a solid oxide fuel cell module 11, a heat exchanger 12, a power conversion device 13, a water tank 14, and a control device 15.

  As will be described later, the solid oxide fuel cell module 11 includes at least a solid oxide fuel cell stack 30. The solid oxide fuel cell module 11 is supplied with reforming fuel, reforming water, and cathode gas (air). Specifically, the solid oxide fuel cell module 11 has one end connected to the supply source Gs and the other end of the reforming fuel supply pipe 11a to which the reforming fuel is supplied. A raw material pump 11a1 is provided in the reforming fuel supply pipe 11a. Further, the solid oxide fuel cell module 11 has one end connected to the water tank 14 and the other end of the water supply pipe 11b to which reformed water is supplied. The water supply pipe 11b is provided with a reforming water pump 11b1. Further, the solid oxide fuel cell module 11 has one end connected to the cathode air blower 11c1 and the other end of the cathode air supply pipe 11c to which cathode gas (air) is supplied.

  The heat exchanger 12 is a heat exchanger in which combustion exhaust gas exhausted from the solid oxide fuel cell module 11 is supplied and hot water stored in the hot water storage tank 21 is supplied, and heat is exchanged between the combustion exhaust gas and the hot water storage. is there. Specifically, the hot water storage tank 21 stores hot water, and is connected to a hot water circulation line 22 through which the hot water circulates (circulates in the direction of the arrow in FIG. 1). A hot water circulation pump 22a and the heat exchanger 12 are arranged on the hot water circulation line 22 in order from the lower end to the upper end. The heat exchanger 12 is connected (penetrated) with an exhaust pipe 11 d from the solid oxide fuel cell module 11. The heat exchanger 12 is connected to a condensed water supply pipe 12 a connected to the water tank 14.

  In the heat exchanger 12, the combustion exhaust gas from the solid oxide fuel cell module 11 is introduced into the heat exchanger 12 through the exhaust pipe 11d, and is exchanged with the hot water and condensed. To be cooled. The condensed combustion exhaust gas is discharged to the outside through the exhaust pipe 11d. Moreover, the condensed condensed water is supplied to the water tank 14 through the condensed water supply pipe 12a. The water tank 14 purifies the condensed water with ion exchange resin.

  The heat exchanger 12, the hot water tank 21, and the hot water circulation line 22 described above constitute an exhaust heat recovery system 20. The exhaust heat recovery system 20 recovers and stores the exhaust heat of the solid oxide fuel cell module 11 in hot water storage.

  The power converter 13 receives the DC voltage output from the solid oxide fuel cell stack 30, converts it to a predetermined AC voltage, and is connected to an AC system power supply 16a and an external power load 16c (for example, an electrical appliance). To the power line 16b. Further, the power conversion device 13 receives an AC voltage from the system power supply 16 a via the power supply line 16 b, converts the AC voltage into a predetermined DC voltage, and outputs it to an auxiliary machine (each pump, blower, etc.) or the control device 15. The controller 15 controls the operation of the solid oxide fuel cell system 1 by driving an auxiliary machine.

<Solid Oxide Fuel Cell Module 11>
As shown in FIG. 2, the solid oxide fuel cell module 11 includes a solid oxide fuel cell stack 30, an evaporation unit 40, a reforming unit 50, and a combustion unit 60.

(Solid oxide fuel cell stack 30)
The solid oxide fuel cell stack 30 includes a base member 31, a heat insulating member 32, a plurality of solid oxide fuel cell cylindrical cells 33, a plurality of connection members 34, a cover 35, an anode gas manifold 36 and a cathode gas manifold 37. I have.

  The base member 31 is made of a metal material (for example, ferritic stainless steel, austenitic stainless steel, chrome-iron-yttrium alloy, etc., but ferritic stainless steel is particularly preferable) and has a rectangular plate shape. Is formed. A heat insulating member 32 is provided on the upper surface of the base member 31. The heat insulating member 32 is for insulating the base member 31 from the solid oxide fuel cell cylindrical cell 33 and the connecting member 34. The heat insulating member 32 is formed in a rectangular plate shape with an insulating and heat insulating material (for example, ceramic made of aluminum oxide, magnesium oxide, silicon oxide or a mixed material thereof).

  The plurality of solid oxide fuel cell cylindrical cells 33 have a power generation reaction, and are erected on the base member 31 through the base member 31. As shown in FIG. 3, each of the solid oxide fuel cell cylindrical cells 33, 33 includes a fuel electrode layer 33a (corresponding to the inner electrode layer), an electrolyte layer 33b, and an air electrode layer 33c (corresponding to the outer electrode layer). These are formed by laminating them in layers. First, the configuration of the solid oxide fuel cell cylindrical cell 33 will be described by taking the solid oxide fuel cell cylindrical cell 33 on the left side of FIG. 3 as an example. The solid oxide fuel cell cylinder on the right side of FIG. The cell 33 has the same configuration as that of the solid oxide fuel cell cylindrical cell 33 on the left side except that the attachment direction in the longitudinal direction of the solid oxide fuel cell cylindrical cell 33 is opposite. ing.

  The fuel electrode layer 33a is formed in a cylindrical shape, and the fuel flows from one end side (arrow Z1 direction side) to the other end side (arrow Z2 direction side). In the present embodiment, the fuel gas is a gas obtained by reforming a hydrocarbon-based fuel such as natural gas described later, and is also referred to as an anode gas. The air electrode layer 33c is laminated outside the fuel electrode layer 33a (inner electrode layer), and the oxidant gas flows from one end side (arrow Z1 direction side) to the other end side (arrow Z2 direction side). . In the present embodiment, the oxidant gas is air and is also referred to as a cathode gas. The electrolyte layer 33b is laminated between the fuel electrode layer 33a (inner electrode layer) and the air electrode layer 33c (outer electrode layer). For example, a ceria mixture doped with rare earth such as GDC (gadolinium doped ceria), YDC (yttrium doped ceria), SDC (samarium doped ceria) is used between the electrolyte layer 33b and the air electrode layer 33c. An anti-reaction layer can also be provided.

  In the present embodiment, each of the plurality of solid oxide fuel cell cylindrical cells 33 is formed in a cylindrical shape, but each solid oxide fuel cell cylindrical cell 33 may be cylindrical, For example, it can be formed in a square cross section. Each of the plurality of solid oxide fuel cell cylindrical cells 33 is formed in the order of the fuel electrode layer 33a, the electrolyte layer 33b, and the air electrode layer 33c from the inside in the radial direction.

  The fuel electrode layer 33a includes, for example, a mixture of a catalytic metal such as Ni or Fe and a stabilized zirconia doped with at least one selected from rare earth elements such as Y, Sc, and Ce, and a catalytic metal such as Ni and Fe. A mixture of ceria doped with at least one kind of rare earth elements such as Gd, Y, Sm, lanthanum gallate doped with a catalytic metal such as Ni or Fe and at least one kind selected from Sr, Mg, Co, Fe, Cu And at least one kind of mixture.

  The electrolyte layer 33b includes, for example, stabilized zirconia doped with at least one selected from rare earth elements such as Y, Sc, and Ce, ceria doped with at least one selected from rare earth elements such as Gd, Y, and Sm, Ni, and Sr. , Lanthanum gallate doped with at least one selected from Mg, Co, Fe and Cu.

  The air electrode layer 33c 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 , Lanthanum cobaltite doped with at least one selected from Cu, barium cobaltite doped with at least one selected from Sr, Fe, silver, silver-palladium alloy, platinum, etc. .

  As shown in FIG. 3, in each of the solid oxide fuel cell cylindrical cells 33, 33, one end of the fuel electrode layer 33a (inner electrode layer) is exposed and the fuel electrode layer 33a (inner electrode layer) is exposed. ) Is covered with an air electrode layer 33c (outer electrode layer). Here, the one end portion means the end portion on the other end side (arrow Z2 direction side) in the solid oxide fuel cell cylindrical cell 33 on the left side of the figure, and the solid oxide on the right side of the figure. In the fuel cell cylindrical cell 33, it means an end portion on one end side (arrow Z1 direction side). The other end means the end on one end side (arrow Z1 direction side) in the solid oxide fuel cell tubular cell 33 on the left side of the figure, and the solid oxide fuel on the right side of the figure. In the battery cylindrical cell 33, the end portion on the other end side (arrow Z2 direction side) is referred to. Hereinafter, one and the other are assumed to have the same direction.

  Each of the solid oxide fuel cell tubular cells 33, 33 includes a fuel electrode layer connected portion 33a1 (corresponding to the inner electrode layer connected portion) and an air electrode layer connected portion 33c1 (outer electrode layer connected portion). Corresponding to the connecting portion). The fuel electrode layer connected portion 33a1 is formed in an exposed portion at one end of the fuel electrode layer 33a (inner electrode layer). The air electrode layer connected portion 33c1 is formed at the other end of the air electrode layer 33c (outer electrode layer).

  In the fuel electrode layer connected portion 33a1, the electrolyte layer 33b and the air electrode layer 33c are not formed, but only the fuel electrode layer 33a is formed. A part of the electrolyte layer 33b is exposed. The formation method of the solid oxide fuel cell cylindrical cell 33 is not particularly limited. For example, the inner electrode layer is formed by a known method such as extrusion, pressing, or casting, and the electrolyte layer and the outer electrode layer are sequentially printed. It can be formed by forming a film by a method such as dipping or slurry coating. By these methods, the solid oxide fuel cell cylindrical cell 33 is manufactured by laminating the electrode materials described above in the order of the fuel electrode layer 33a, the electrolyte layer 33b, and the air electrode layer 33c from the inside in the radial direction. By performing masking according to the part at the stage of the film, a part where the fuel electrode layer 33a is exposed and a part where the electrolyte layer 33b is exposed are formed. Moreover, it is also possible to produce the solid oxide fuel cell cylindrical cell 33 in which the outer diameter of an arbitrary part is changed by locally forming the film.

The plurality of connecting members 34 electrically connect the plurality of solid oxide fuel cell cylindrical cells 33 in series. The connecting member 34 includes a fuel electrode layer connected portion 33a1 (inner electrode layer connected portion) provided in the fuel electrode layer 33a (inner electrode layer) of one solid oxide fuel cell cylindrical cell 33, and one The air electrode layer connected portion 33c1 (on the air electrode layer 33c (outer electrode layer) of another solid oxide fuel cell cylindrical cell 33 electrically adjacent to the solid oxide fuel cell cylindrical cell 33 ( The outer electrode layer connected portion).

  As shown in FIG. 2, each of the solid oxide fuel cell cylindrical cells 33, 33 includes a first cap 71 and a second cap 72. The first cap 71 and the second cap 72 can be formed using, for example, ferritic stainless steel, lanthanum chromite, or the like. The first cap 71 is interposed between the fuel electrode layer connected portion 33a1 (inner electrode layer connected portion) and the connecting member 34, and is connected to the fuel electrode layer connected portion 33a1 (inner electrode layer connected portion). The member 34 is electrically connected. The second cap 72 is interposed between the air electrode layer connected portion 33c1 (outer electrode layer connected portion) and the connection member 34, and is connected to the air electrode layer connected portion 33c1 (outer electrode layer connected portion). The member 34 is electrically connected.

  As shown in FIG. 3, among the plurality of solid oxide fuel cell tubular cells 33, the electrically adjacent solid oxide fuel cell tubular cells 33, 33 are solid oxide fuel cell tubular cells 33. Are arranged on the base member 31 so that the mounting directions in the longitudinal direction are opposite to each other. Specifically, the solid oxide fuel cell cylindrical cell 33 on the left side shown in FIG. 3 has a fuel electrode layer connected portion 33a1 disposed on the other end side (arrow Z2 direction side), and the air electrode layer connected The portion 33c1 is erected on the anode gas manifold 36 so as to be disposed on one end side (arrow Z1 direction side). On the other hand, in the solid oxide fuel cell cylindrical cell 33 on the right side shown in FIG. 3, the fuel electrode layer connected portion 33a1 is disposed on one end side (arrow Z1 direction side), and the air electrode layer connected portion 33c1 is the other. The anode gas manifold 36 is erected so as to be disposed on the end side (arrow Z2 direction side). Thus, when the plurality of solid oxide fuel cell cylindrical cells 33 are erected on the anode gas manifold 36, the fuel electrode layer connected portion 33a1 and the air electrode layer connected portion 33c1 are in the first direction (arrows). (Z direction).

  As shown in FIG. 2, the plurality of connection members 34 electrically connect a plurality of solid oxide fuel cell tubular cells 33 in series. Specifically, in the solid oxide fuel cell tubular cells 33 and 33 that are electrically adjacent to each other, the connecting member 34 is a fuel electrode layer on one end side (arrow Z1 direction side) in the first direction (arrow Z direction direction). The connected portion 33a1 and the air electrode layer connected portion 33c1 are electrically connected. Further, in the electrically adjacent solid oxide fuel cell cylindrical cells 33, 33, the connection member 34 is connected to the air electrode layer on the other end side (arrow Z2 direction side) in the first direction (arrow Z direction direction). The portion 33c1 and the fuel electrode layer connected portion 33a1 are electrically connected. By repeating the above connection, the plurality of solid oxide fuel cell cylindrical cells 33 are all connected in series by the plurality of connection members 34. In addition, the connection part of the both ends of the solid oxide fuel cell cylindrical cell 33 connected in series is each connected to the bus-bar 38b via the bus-bar connection member 38a.

  As shown in FIG. 2, the cover 35 is attached to the upper surface of the base member 31. The cover 35 is formed in a box shape having an opening that opens downward. In a sealed space R1 formed between the cover 35 and the base member 31, the solid oxide fuel cell cylindrical cell 33, the evaporation unit 40, and the reforming unit 50 are accommodated. Although not shown, a flange formed outward is formed in the opening of the cover 35. The flange is in contact with the upper surface of the base member 31, and is fixed to the base member 31 with screws or the like. Has been. An exhaust port 35c is formed in the ceiling portion of the cover 35, and combustion exhaust gas is exhausted through the exhaust port 35c.

  As shown in FIG. 2, the anode gas manifold 36 is attached to the lower surface of the base member 31. The anode gas manifold 36 is provided with an anode gas supply pipe (not shown), one end of which is connected to the reforming unit 50 and supplied with anode gas (fuel gas).

  As shown in FIG. 4, the anode gas manifold 36 includes a main body 36a formed in a bottomed box shape opening upward, and a top plate 36b as a lid member formed in a plate shape so as to cover the entire opening. have. The main body 36a has a mounting portion 36a1 as a protruding portion at the end of the opening. The placement portion 36a1 protrudes toward the outer periphery of the main body 36a so that the top plate 36b is placed in contact therewith. A standing wall-like folded portion 36a2 is formed on the distal end side of the placement portion 36a1 (that is, the peripheral edge portion 36a3 of the main body 36a). The folded portion 36a2 is formed by machining (specifically, pressing and caulking) with the top plate 36b placed on the placement portion 36a1, as shown in FIG. 36b2 is included and folded. By such machining, the folded portion 36a2 is folded over the entire circumference, so that the top plate 36b is firmly fixed to the main body 36a.

  The top plate 36b is formed with a plurality of through holes 36b1 and 36b1 that constitute standing portions that allow the plurality of solid oxide fuel cell cylindrical cells 33 and 33 to penetrate toward the inside of the main body 36a. Thus, the plurality of solid oxide fuel cell cylindrical cells 33 and 33 are erected with respect to the top plate 36 b of the anode gas manifold 36.

  Here, a method for assembling the anode gas manifold 36 and a method for erecting the plurality of solid oxide fuel cell cylindrical cells 33 and 33 will be described. In addition, about an assembly method and an upright method, it is not limited to the process demonstrated below.

  The first step is a step of fixing the top plate 36b to the main body 36a. Specifically, the top plate 36b is placed on the placement portion 36a1 of the main body 36a. Thereafter, the folded portion 36a2 of the main body 36a is folded over the entire circumference by press working (caulking), and the peripheral edge 36b2 of the placed top plate 36b is crimped over the entire circumference. At this time, the peripheral edge portion 36b2 of the top plate 36b is included in the folded portion 36a2 of the main body 36a.

  By applying a pressing force (caulking force) in this state, the upper surface side (the surface on the base member 31 side and one surface side) of the top plate 36b and the inner surface side (the surface on the main body 36a side) of the folded portion 36a2 are mutually connected. A crimping surface is formed between the upper surface side (one surface side) of the top plate 36b and the inner surface side (surface of the main body 36a side) of the folded portion 36a2. Similarly, by applying a pressing force (caulking force), the lower surface side of the top plate 36b (the surface on the main body 36a side, that is, the surface opposite to the mounting portion 36a1 and the other surface side) and the surface of the mounting portion 36a1. Are crimped to each other, and a crimping surface is formed between the lower surface side (other surface side) of the top plate 36b and the surface of the mounting portion 36a1.

  As shown in FIG. 6, the second step is a step in which a plurality of solid oxide fuel cell cylindrical cells 33, 33 are erected in the through hole 36 b 1 of the top plate 36 b. Specifically, the solid oxide fuel cell cylindrical cell 33 is inserted into each through hole 36b1. At this time, although illustration is omitted, it is preferable to provide an accommodating member for accommodating the solid oxide fuel cell tubular cell 33 in each opening of the through hole 36b1. In addition, it is preferable to store or apply an insulating sealing material to the storage member.

In a state where the solid oxide fuel cell cylindrical cell 33 is erected with respect to the top plate 36b, insulation is provided at the boundary portion between the through hole 36b1 of the top plate 36b and the outer periphery of the solid oxide fuel cell cylindrical cell 33. A sealing member 39 is provided. For example, crystallized glass can be used for the insulating seal member 39. As the crystallized glass, for example, crystallized glass containing alumina (Al ₂ O ₃ ), silica (SiO ₂ ), or the like as a main component can be used.

  The third step is a step of performing a heat treatment for the purpose of removing processing distortion and melting the insulating seal member 39 in the assembly step of the anode gas manifold 36. As the heat treatment temperature, metal materials (materials) of the main body 36a and the top plate 36b of the anode gas manifold 36 (for example, ferritic stainless steel, austenitic stainless steel, chromium-iron-yttria alloy, etc. are used. Ferritic stainless steel is particularly suitable.) Is performed at a temperature at which it does not melt. By this heat treatment, the atoms of the material diffuse to each other on the pressure-bonding surface formed between the main body 36a and the top plate 36b, thereby forming a diffusion layer 36c. When the diffusion layer 36c is thus formed, the main body 36a and the top plate 36b are integrated as a material on the pressure-bonding surface. By forming the diffusion layer 36c in this way, the sealing performance between the main body 36a and the top plate 36b is ensured in the anode gas manifold 36.

  Moreover, the insulating sealing member 39 (for example, crystallized glass) is softened by the heat treatment and flows between the through hole 36b1 of the top plate 36b and the solid oxide fuel cell cylindrical cell 33. When the temperature is further increased after the softening, the crystallized glass is crystallized to be in a solid state by the operating temperature of the solid oxide fuel cell stack 30, and the solid state is maintained. As the insulating seal member 39, amorphous glass can be used instead of crystallized glass. In this way, the insulating seal member 39 flows and fills the gap at the boundary portion between the through hole 36b1 of the top plate 36b and the outer periphery of the solid oxide fuel cell cylindrical cell 33, whereby the through hole of the top plate 36b. The sealing property between 36b1 and the outer periphery of the solid oxide fuel cell cylindrical cell 33 is ensured. Thereby, in the anode gas manifold 36, a sealed space is formed between the main body 36a and the top plate 36b.

  In addition, about heat processing, you may perform for the above assembly processes and standing processes, and you may utilize (reuse) the heat processing normally performed when manufacturing a solid oxide fuel cell. It is preferable to use a heat treatment step that is normally performed because it is not necessary to separately provide a heat treatment step by utilizing (dividing) a heat treatment step that is normally performed (such as an annealing step).

  The cathode gas manifold 37 is provided in the space R1. The cathode gas manifold 37 is disposed below the upper surface of the heat insulating member 32. The cathode gas manifold 37 is disposed around the heat insulating member 32. A plurality of outflow holes (arrow positions in FIG. 2) through which the cathode gas (air) flows out upward are formed in the upper part of the cathode gas manifold 37. A cathode gas supply pipe 37a to which cathode gas (air) is supplied is connected to the cathode gas manifold 37.

(Evaporation part 40)
The evaporation unit 40 is heated by the combustion gas of the solid oxide fuel cell stack 30, evaporates the supplied reforming water to generate water vapor, and preheats the supplied reforming fuel. The evaporation unit 40 mixes the steam generated in this way with the preheated reforming fuel and supplies it to the reforming unit 50. Examples of the reforming fuel include gas fuel for reforming such as natural gas and LP gas, and liquid fuel for reforming such as kerosene, gasoline, and methanol. In this embodiment, the reforming fuel uses natural gas. Yes.

  The other end of the water supply pipe 11 b whose one end (lower end) is connected to the water tank 14 is connected to the evaporation unit 40. In addition, a reforming fuel supply pipe 11 a having one end connected to the supply source Gs is connected to the evaporation unit 40. The supply source Gs is, for example, a gas supply pipe for city gas or a gas cylinder for LP gas.

(Reformer 50)
The reforming unit 50 is heated by the above-described combustion gas and supplied with heat necessary for the steam reforming reaction, so that fuel gas is generated from the steam supplied from the evaporation unit 40 and the mixed gas of the reforming fuel. A certain reformed gas is generated. The reforming section 50 is filled with a catalyst (for example, Ru or Ni-based catalyst), and the mixed gas reacts with the catalyst to be reformed to generate a gas containing hydrogen and carbon monoxide. (So-called steam reforming reaction).

  These generated gases (so-called reformed gases) are the anode gas described above, and the fuel electrode of the solid oxide fuel cell cylindrical cell 33 through the anode gas manifold 36 of the solid oxide fuel cell stack 30. Derived to layer 33a. The reformed gas contains hydrogen, carbon monoxide, carbon dioxide, steam, unreformed natural gas (methane gas), and reformed water (steam) that has not been used for reforming. Thus, the reforming unit 50 generates reformed gas (fuel) from the reforming fuel (raw fuel) and the reformed water and supplies the reformed gas (fuel) to the solid oxide fuel cell stack 30. The steam reforming reaction is an endothermic reaction.

(Combustion part 60)
The combustion unit 60 is provided between each solid oxide fuel cell cylindrical cell 33, the evaporation unit 40, and the reforming unit 50. In the combustion unit 60, the anode off-gas (fuel off-gas) from the solid oxide fuel cell tubular cell 33 and the cathode off-gas (oxidant off-gas) from the solid oxide fuel cell tubular cell 33 are burned and reformed. The part 50 is heated.

  As can be understood from the above description, according to the first embodiment, the inner electrode layer 33a formed in a cylindrical shape, the outer electrode layer 33c laminated on the outer side of the inner electrode layer 33a, and the inner electrode layer An electrolyte layer 33b formed between the outer electrode layer 33c and the outer electrode layer 33c, and a plurality of solid oxide fuel cell tubular cells 33 that are supplied with a fuel gas and an oxidant gas and generate a power generation reaction; A box-shaped anode gas manifold 36 having a through hole 36b1 as an upright portion for standing the solid oxide fuel cell cylindrical cell 33 and supplying fuel gas to the solid oxide fuel cell cylindrical cell 33 The anode gas manifold 36 is formed in the shape of a bottomed box having an opening, and extends from the end on the opening side to the outer periphery over the entire circumference. Protruding protrusion And a top plate 36b that is a lid member that is formed in a plate shape and has a through hole 36b1 and covers the entire opening of the main body 36a. The top plate 36b is formed on one peripheral portion 36a3 of the peripheral portion 36a3 of the main body 36a and the peripheral portion 36b2 of the top plate 36b in a state where the top plate 36b is placed in contact with the mounting portion 36a1 of the main body 36a. Thus, the other peripheral edge 36b2 of the peripheral edge 36a3 of the main body 36a and the peripheral edge 36b2 of the top plate 36b is included, and a pressure bonding surface is formed by pressure bonding the one peripheral edge 36a3 and the other peripheral edge 36b2. It can comprise so that it may have the folding | returning part 36a2.

  Thus, in the solid oxide fuel cell, the anode gas manifold 36 has the folded portion 36a2, so that the main body 36a and the top plate 36b are fixed by performing machining (pressing or caulking). Can do. Thereby, it is not necessary to perform welding for melting the material in order to join the main body 36a and the top plate 36b, the anode gas manifold 36 can be manufactured very easily, and good mechanical strength and sealing performance can be obtained. Can be secured. Therefore, it is possible to manufacture a solid oxide fuel cell that suppresses an increase in manufacturing cost and has high structural reliability.

  Further, if the main body 36a and the top plate 36b are fixed by welding, in particular, the top plate 36b is likely to be thermally strained. As a result, the solid oxide fuel cell tubular cell 33 is attached to the anode gas manifold 36. When standing, it is conceivable that the standing posture of the solid oxide fuel cell cylindrical cell 33 deteriorates. In this case, in the production of the solid oxide fuel cell, for example, the assembly work of the solid oxide fuel cell cylindrical cell 33 and the connection member 34 becomes complicated.

  On the other hand, in the solid oxide fuel cell of the first embodiment, the anode gas manifold 36 fixes the main body 36a and the top plate 36b only by machining (pressing or caulking) without welding. Therefore, the top plate 36b is not thermally strained. For this reason, the flatness of the top plate 36b is ensured satisfactorily. Thereby, the solid oxide fuel cell cylindrical cell 33 can be erected accurately (perpendicularly) with respect to the top plate 36b with ensured flatness. Therefore, it is easy to stand up the plurality of solid oxide fuel cell cylindrical cells 33, and the plurality of solid oxide fuel cell cylindrical cells 33 can be placed upright with respect to the anode gas manifold 36. it can. Thereby, the anode gas manifold 36 in which the plurality of solid oxide fuel cell cylindrical cells 33 are erected can be easily assembled to the base member 31. As a result, an increase in manufacturing cost of the solid oxide fuel cell can be suppressed.

  Further, in a solid oxide fuel cell, air is supplied as an oxidant gas. In this case, moisture (water vapor) is contained in the supplied air, and when this moisture (water vapor) touches a metal material (specifically, stainless steel) constituting the solid oxide fuel cell in operation. The chromium contained in the stainless steel evaporates with moisture. Thus, when chromium evaporates with moisture, it may adhere to the solid oxide fuel cell cylindrical cell 33 (so-called chromium poisoning). When such chromium poisoning occurs, the power generation capacity of power generation by the solid oxide fuel cell cylindrical cell 33 is reduced, so that the metal material (stainless steel) constituting the solid oxide fuel cell is on the surface thereof. A surface treatment (film formation treatment) is performed to prevent evaporation of chromium. This surface treatment (film formation treatment) is indispensable from the viewpoint of preventing chromium poisoning. However, for example, when welding is performed, the coating formed on the surface by the surface treatment (coating formation treatment) is unsuitable for welding, and therefore, it is necessary to remove the coating formed on the surface of the welded portion. Therefore, when the main body 36a and the top plate 36b are fixed by welding, the assembling work becomes extremely complicated.

  On the other hand, in the solid oxide fuel cell of the first embodiment, the anode gas manifold 36 fixes the main body 36a and the top plate 36b only by machining (pressing or caulking) without welding. be able to. Therefore, the assembly work of the main body 36a and the top plate 36b is extremely easy. As a result, an increase in manufacturing cost of the solid oxide fuel cell can be suppressed and structural reliability can be ensured.

  Further, in this case, a diffusion layer 36c can be provided on the crimping surface, in which the respective materials forming the main body 36a and the top plate 36b are joined in a state where atoms of the respective materials are diffused without melting. .

  The diffusion layer 36c can be formed by diverting a heat treatment step, for example, an essential heat treatment step in the manufacturing process of the solid oxide fuel cell. The main body 36a and the top plate 36b can be fixed (integrated) by forming the diffusion layer 36c on the crimping surface. Thereby, while being able to improve the mechanical strength of the folding | returning part 36a2, the sealing performance in the folding | returning part 36a2 can be improved more.

(Second embodiment)
In the first embodiment, the folded portion 36a2 is formed on the main body 36a, the folded portion 36b2 is folded so as to include the peripheral edge 36b2 of the top plate 36b, and the diffusion layers 36c are formed on both surfaces of the peripheral edge 36b2 of the top plate 36b. did. Thereby, the folding | returning part 36a2 which is the peripheral part 36a3 of the main body 36a and the peripheral part 36b2 of the top plate 36b can be integrated, and favorable sealing property was ensured.

  In this second embodiment, in order to further improve the sealing performance, a diffusion layer 36c is formed on one surface side of the peripheral portion 36b2 of the top plate 36b, and the placing portion 36a1 and the top plate 36b which are the peripheral portion 36a3 of the main body 36a. A glass layer 36d is formed between the peripheral surface 36b2 and the other surface side. Hereinafter, although this 2nd embodiment is described in detail, the same code | symbol is attached | subjected to the same part as said 1st embodiment, and the detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 7, glass for forming a glass layer 36d is disposed on the mounting portion 36a1 of the main body 36a. Specifically, paste-like glass is placed by screen printing, glass formed into a sheet shape by tape casting, or powdered glass is compacted into a sheet shape and placed, etc. Glass is applied to the mounting portion 36a1. In addition, about glass, the crystallized glass etc. which were mentioned above can be used. As in the first embodiment, in the second embodiment, through the first step, as shown in FIG. 8, the main body 36a and the top plate 36b are machined (pressed or processed). It is firmly fixed by fastening). In this case, the paste (glass layer 36d) is sandwiched between the placement portion 36a1 of the main body 36a and the other surface side of the peripheral edge portion 36b2 of the top plate 36b.

  Also in this second embodiment, a plurality of solid oxide fuel cell tubular cells 33 are erected as shown in FIG. 9 through the second step. Furthermore, also in this second embodiment, the solvent of the paste evaporates by the heat treatment in the third step, and the glass layer 36d is placed between the mounting portion 36a1 and the other surface side of the peripheral portion 36b2 of the top plate 36b. Is formed. In this case, as shown in FIG. 9, since the crimping surface is formed on one surface side of the folded portion 36a2 of the main body 36a and the peripheral edge 36b2 of the top plate 36b, the diffusion layer 36c is formed on this crimping surface.

  Thus, according to the second embodiment, the diffusion layer 36c is formed at least on one surface side of the peripheral portion 36b2 of the top plate 36b, and the peripheral portion 36a3 (that is, the mounting portion 36a1) of the main body 36a and the top plate 36b. A glass layer 36d that fills a gap between the peripheral edge 36a3 of the main body 36a (that is, the placement portion 36a1) and the other peripheral surface side of the peripheral edge 36b2 of the top plate 36b. Can be provided.

  Thereby, according to this 2nd embodiment, in addition to formation of the diffusion layer 36c, the glass layer 36d is formed, and thereby better sealing performance is ensured. The peripheral portion 36b2 of the top plate 36b is crimped (clamped) by the folded portion 36a2 of the main body 36a, so that the main body 36a and the top plate 36b are fixed in a state in which sufficient mechanical strength is ensured. . Accordingly, the formed glass layer 36d does not need mechanical strength such as adhesive strength, and only fills a gap between the mounting portion 36a1 of the main body 36a and the peripheral portion 36b2 of the top plate 36b. . Thereby, the formed glass layer 36d is not damaged, and good sealing performance can be maintained.

(Modification of the second embodiment)
In the second embodiment, the glass layer 36d is formed between the placing portion 36a1 and the other surface side of the peripheral portion 36b2 of the top plate 36b. In this case, as shown in FIG. 10, it is possible to provide a compression seal 36e as a compression member instead of forming the glass layer 36d. The compression seal 36e is compressed between the placement portion 36a1 and the other surface side of the peripheral edge portion 36b2 of the top plate 36b, and between the placement portion 36a1 and the other surface side of the peripheral edge portion 36b2 of the top plate 36b. It fills the gap. As the compression seal 36e, for example, ceramic fibers (artificial mineral fibers mainly composed of alumina and silica), layered silicate minerals such as mica (mica), and the like can be used.

  As described above, in the case where the compression seal 36e is provided between the placement portion 36a1 and the other surface side of the peripheral edge portion 36b2 of the top plate 36b, as in the second embodiment, 11, the main body 36a and the top plate 36b are fixed. In this case, the compression seal 36e is compressed and fixed between the placement portion 36a1 and the other surface side of the peripheral edge portion 36b2 of the top plate 36b. Further, through the second step, a plurality of solid oxide fuel cell cylindrical cells 33 are erected as shown in FIG. Furthermore, in the second step, as shown in FIG. 12, the heat treatment forms a pressure bonding surface on one surface side of the folded portion 36a2 of the main body 36a and the peripheral edge 36b2 of the top plate 36b. Layer 36c is formed.

  Thus, according to the modification of the second embodiment, the diffusion layer 36c is formed at least on one surface side of the peripheral portion 36b2 of the top plate 36b, and the peripheral portion 36a3 (that is, the placement portion 36a1) of the main body 36a and the top. Between the peripheral surface 36b2 of the plate 36b and the other surface side of the plate 36b, the main body 36a is compressed between the peripheral portion 36a3 (that is, the mounting portion 36a1) and the other surface side of the peripheral portion 36b2 of the top plate 36b. A compression seal 36e can be provided as a compression member that fills a gap between the peripheral edge 36a3 of 36a (that is, the mounting portion 36a1) and the other surface side of the peripheral edge 36b2 of the top plate 36b.

  Thereby, according to the modification of this second embodiment, in addition to the formation of the diffusion layer 36c, the compression seal 36e is provided, thereby ensuring better sealing performance.

  The present invention is not limited to the above embodiments and the above modifications, and various modifications can be employed within the scope of the present invention. For example, in each of the above embodiments and modifications, the folded portion 36a2 is formed in the main body 36a. Instead of this, as shown in FIGS. 13 to 15, it is also possible to form a folded portion 36 b 3 on the top plate 36 b that is a lid member. Specifically, as shown in FIG. 13, a folded portion 36b3 is formed on the top plate 36b, and the folded portion 36b3 is folded so as to accommodate the peripheral portion 36a3 of the main body 36a. In this case, the diffusion layer 36c is formed on both surfaces of the peripheral edge 36a3 of the main body 36a.

  Further, as shown in FIG. 14, a folded portion 36b3 is formed on the top plate 36b, and the folded portion 36b3 is folded so as to accommodate the peripheral edge portion 36a3 of the main body 36a. In this case, the diffusion layer 36c is formed on one surface side of the peripheral portion 36a3 of the main body 36a, and the other surface side (specifically, the protruding portion) of the peripheral portion 36b2 of the top plate 36b and the peripheral portion 36a3 of the main body 36a. A glass layer 36d is formed between the mounting portion 36a1).

  Further, as shown in FIG. 15, a folded portion 36b3 is formed on the top plate 36b, and the folded portion 36b3 is folded so as to accommodate the peripheral edge portion 36a3 of the main body 36a. In this case, the diffusion layer 36c is formed on one surface side of the peripheral portion 36a3 of the main body 36a, and the other surface side (specifically, the mounting portion 36a1) of the peripheral portion 36b2 of the top plate 36b and the peripheral portion 36a3 of the main body 36a. ) Is provided with a compression seal 36e. Accordingly, in these cases, the same effects as those of the above embodiments and modifications can be obtained.

  Further, in each of the above-described embodiments and modifications, the peripheral portion 36b2 of the top plate 36b is pressure-bonded between the folded portion 36a2 of the main body 36a and the placement portion 36a1. In this case, as shown in FIG. 16, the peripheral portion 36b2 of the top plate 36b can be pressure-bonded between the folded portion 36a2 and the peripheral portion 36a3 of the main body 36a. In this case, as shown in FIG. 16, the peripheral edge 36b2 of the top plate 36b is formed to stand upright. Further, the mounting portion 36a1 of the main body 36a is formed so as to protrude from the end on the opening side toward the inner periphery of the main body 36a over the entire circumference. In this case, the folded portion 36a2 of the main body 36a is folded so as to accommodate the standing wall portion of the peripheral edge portion 36b2 of the top plate 36b. In this case, both surfaces of the crimping surface between the folded portion 36a2 and the standing wall portion of the peripheral portion 36b2 and the crimping surface between the peripheral portion 36a3 of the main body 36a and the standing wall portion of the peripheral portion 36b2 of the top plate 36b. Thus, the diffusion layer 36c is formed. Accordingly, even in this case, the same effect as that of the first embodiment can be obtained.

  Further, as shown in FIG. 17, with respect to the anode gas manifold 36 shown in FIG. 16, a glass layer 36d is formed between the mounting portion 36a1 formed on the inner periphery and the peripheral portion 36b2 of the top plate 36b. It is also possible to do. Further, as shown in FIG. 18, a compression seal 36e is provided between the mounting portion 36a1 formed on the inner periphery of the anode gas manifold 36 shown in FIG. 16 and the peripheral portion 36b2 of the top plate 36b. It is also possible. Accordingly, in these cases, the same effects as those of the second embodiment and the modification can be obtained.

  Further, instead of the anode gas manifold 36 shown in FIGS. 16 to 18, as shown in FIGS. 19 to 21, it is also possible to form the folded portion 36 b 3 on the standing wall portion formed on the peripheral edge portion 36 b 2 of the top plate 36 b. It is. In these cases, the same effects as those in the above embodiments and modifications can be obtained.

  Further, for example, when the folded portion 36a2 of the main body 36a is folded by machining, an overlapping portion is generated in a part of the folded portion (specifically, corner portions of the main body 36a and the top plate 36b). In this case, the overlapped portions can be joined by welding as necessary. In this case, since there are few parts that require welding, for example, even when the coating formed by the surface treatment described above is removed, it can be removed relatively easily. Therefore, the welding operation can be easily performed. Moreover, since the part which requires welding is limited, the thermal distortion which generate | occur | produces in the top plate 36b is also very small. Therefore, the standing posture when the plurality of solid oxide fuel cell cylindrical cells 33 are erected is not disturbed, and good erection workability is not impaired.

  It should be noted that the portions corresponding to the corner portions of the folded-back portion 36a2 and the folded-back portion 36b3 can be cut out in advance so that the overlapping portion does not occur. By cutting in advance in this way, welding can be avoided.

  In the second embodiment and the modification, the glass layer 36d is formed between the mounting portion 36a1 of the main body 36a and the peripheral portion 36b2 of the top plate 36b, or the compression seal 36e is provided. In this case, for example, as shown in FIG. 22, a glass layer 36d is formed between the folded portion of the folded portion 36a2 of the main body 36a and the peripheral portion 36b2 of the top plate 36b, or a compression seal 36e is provided. It is also possible. In this case, as shown in FIG. 22, the diffusion layer 36c is formed between the mounting portion 36a1 of the main body 36a and the peripheral portion 36b2 of the top plate 36b. Accordingly, even in this case, the same effects as those of the second embodiment and the modification can be obtained.

  Further, as shown in FIG. 23, it is possible to perform folding (pressing or caulking) by folding the folded portion 36a2 in advance and inserting the top plate 36b into this portion. According to this, appropriate positioning is possible, and workability is improved.

  Moreover, in each said embodiment and each modification, the top plate 36b was mounted in the main body 36a opened upwards, and the folding | returning part 36a2 was provided in the peripheral part 36a3. In this case, as shown in FIG. 24, when the main body 36a opens downward, a lower plate 36f as a lid member can be used instead of the top plate 36b. Hereinafter, the case of the first embodiment will be described as an example. When the main body 36a is opened downward, as shown in FIG. 24, machining (specifically, with the lower plate 36f in contact with a flange 36a4 which is a protrusion provided on the main body 36a) ), The folded portion 36a5 is provided. Therefore, also in this case, the same effects as those of the above embodiments and modifications can be obtained.

  As shown in FIG. 25, when the main body 36a is open in the left-right direction, a horizontal plate 36g as a lid member can be used instead of the top plate 36b and the lower plate 36f. When the main body 36a is open in the left-right direction, as shown in FIG. 25, machining (specifically, with the horizontal plate 36g in contact with a flange 36a6 which is a protrusion provided on the main body 36a) Are provided with a folded portion 36a7 by pressing, caulking, or the like. Therefore, also in this case, the same effects as those of the above embodiments and modifications can be obtained.

  Moreover, in each said embodiment and each modification, the top plate 36b which is a cover member was made into plate shape. In this case, as shown in FIG. 26, a box-shaped top plate 36h can be used. Even in this case, by providing the folded portion 36b3 on the box-shaped top plate 36h, the same effects as those in the above embodiments and modifications can be obtained.

  In addition, the number of times of folding by mechanical processing (pressing, caulking, etc.) when providing the folded portion 36a2 is not limited to one folding. For example, as shown in FIG. 27, after the peripheral edge 36a3 of the main body 36a is folded back in a state in which the peripheral edge 36b2 of the top plate 36b, which is a lid member, is included, it can be further bent upward. Similarly, as shown in FIG. 28, after the peripheral edge 36a3 of the main body 36a is folded back in a state in which the peripheral edge 36b2 of the top plate 36b, which is a lid member, is included, it can be further bent upward. Further, as shown in FIG. 29, it is possible to fold the peripheral portion 36a3 of the main body 36a upward after the peripheral portion 36b2 of the top plate 36b as a lid member is included, and then further fold it upward. Similarly, as shown in FIG. 30, after the peripheral edge 36a3 of the main body 36a is folded downward with the peripheral edge 36b2 of the top plate 36b, which is a lid member, included, it is also possible to fold it further downward. . Thus, by increasing the number of times of folding, the mechanical strength can be improved and the sealing performance can be further improved.

  Further, in each of the above embodiments and modifications, the manifold is the anode gas manifold 36. In this case, the manifold may be the cathode gas manifold 37. Even in this case, the same effects as those of the above embodiments and modifications can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Solid oxide fuel cell system, 33 ... Solid oxide fuel cell cylindrical cell, 33a ... Inner electrode layer, 33b ... Electrolyte layer, 33c ... Outer electrode layer, 36 ... Anode gas manifold (manifold), 36a ... Main body, 36a1... Placement part (projection part), 36a2 ... Folded part, 36a3 ... Peripheral part, 36a4 ... Flange (projection part), 36a6 ... Flange (projection part), 36b ... Top plate (lid member), 36b1 ... Through Hole, 36b2 ... Peripheral part, 36b3 ... Folded part, 36b5 ... Folded part, 36b7 ... Folded part, 36c ... Diffusion layer, 36d ... Glass layer, 36e ... Compression seal, 36f ... Lower plate (lid member), 36g ... Horizontal plate (Cover member), 36h ... Box-shaped top plate (Cover member)

Claims (5)

An inner electrode layer formed in a cylindrical shape, an outer electrode layer laminated outside the inner electrode layer, and an electrolyte layer formed between the inner electrode layer and the outer electrode layer, A plurality of solid oxide fuel cell tubular cells that are supplied with a fuel gas and an oxidant gas to generate a power reaction;
A box-shaped manifold that has a standing portion for standing the plurality of solid oxide fuel cell tubular cells, and supplies the fuel gas or the oxidant gas to the solid oxide fuel cell tubular cells; A solid oxide fuel cell comprising:
The manifold is
A bottomed box-shaped body having an opening, and a main body formed with a protruding portion protruding from the end of the opening toward the outer periphery or the inner periphery;
A cover member covering the entire opening of the main body,
In the state where the lid member is in contact with the projecting portion of the main body, one of the peripheral edge portion of the main body and the peripheral edge portion of the lid member is formed on the peripheral edge portion of the main body. It is configured to include a folded portion that encloses the other peripheral portion of the peripheral portions of the lid member and forms a pressure-bonding surface in which the one peripheral portion and the other peripheral portion are pressed together. Solid oxide fuel cell.   2. The diffusion layer according to claim 1, wherein a diffusion layer is provided on the pressure-bonding surface so that the respective materials forming the main body and the lid member are joined in a state where atoms of the respective materials are diffused to each other without melting. Solid oxide fuel cell. The diffusion layer is formed on at least one surface side of the other peripheral edge;
A glass layer that fills a gap between the one peripheral edge and the other surface of the other peripheral edge between the one peripheral edge and the other peripheral surface of the other peripheral edge. The solid oxide fuel cell according to claim 2, wherein The diffusion layer is formed on at least one surface side of the other peripheral edge;
Compressed between the one peripheral edge and the other surface of the other peripheral edge between the one peripheral edge and the other peripheral edge of the other peripheral edge. 3. The solid oxide fuel cell according to claim 2, further comprising a compression member that fills a gap between the peripheral edge of the second peripheral edge and the other surface of the other peripheral edge. The protrusion is
2. The solid oxide fuel cell according to claim 1, wherein the solid oxide fuel cell is provided so as to protrude from the end of the opening of the main body toward the outer periphery or the inner periphery.

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