JP2015185299A - Solid-state oxide type fuel battery stack, solid-state oxide type fuel battery module and solid-state oxide type fuel battery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-state oxide type fuel battery stack that is enhanced in assemblability.SOLUTION: A solid-state oxide type fuel battery stack 30 includes a base member 31, plural solid-state oxide type fuel battery cylindrical cells 33 each comprising an inner electrode layer which penetrates through the base member 31, erects from the bae member 31 and is formed in a cylindrical shape and through which one of fuel and oxidant gas flow from one end side to the other end side, and an outer electrode layer which is staked at the outside of the inner electrode layer and through which the other of the fuel and the oxidant gas flows from one end side to the other end side, a heat insulation member that is disposed in contact with a combustion portion 60 side of the base member 31 at which fuel off-gas and oxidant off-gas are combusted with each other, each solid-state oxide type fuel battery cylindrical cell 33 being press-fitted in each through-hole, thereby insulating heat from the other end side as the combustion end side and one end side, and connection members 34 which are electrically connected to the plural solid-state oxide type fuel battery cylindrical cells 33 in series, and partially come into contact with the combustion portion 60 side of the heat insulating member 32.

Description

  The present invention relates to a solid oxide fuel cell stack, a solid oxide fuel cell module, and a solid oxide fuel cell system in which a plurality of solid oxide fuel cell cylindrical cells are connected in series by connecting members.

  As a type of solid oxide fuel cell stack, the one shown in Patent Document 1 is known. As shown in FIG. 1 of Patent Document 1, a solid oxide fuel cell stack is a solid oxide fuel cell stack having a cylindrical open end with at least an air electrode, an electrolyte, and a fuel electrode housed in a fuel cell container 1. The fuel cell 13, the lower partition wall 8 having the oxidant supply hole 4, the upper partition wall 14, and the oxidant supply hole in which the lower end 5 of the solid oxide fuel cell 13 is provided in the lower partition wall 8. 4 and a joint portion 7 hermetically joined to each other, and an upper end 17 of the solid oxide fuel cell 13 penetrates the upper partition wall 14, and the fuel cell container 1, the lower partition wall 8, and the upper partition wall A fuel gas is supplied to the power generation chamber 12 surrounded by 14, and an oxidant gas is supplied from the oxidant supply hole 4 to the inside of the solid oxide fuel cell 13, thereby generating a cylindrical solid oxide form. A fuel cell power generator, wherein the contact Heat transfer blocking means 9 is provided in section 7 around.

  As another type of the solid oxide fuel cell stack, the one shown in Patent Document 2 is known. As shown in FIG. 4 of Patent Document 2, in the solid oxide fuel cell stack, a plurality of fuel cells 33 having gas flow paths 34 are formed on a cell support plate 50a having a thickness of 2 mm or more. Each of the cell insertion holes 50a1 is inserted and joined to stand upright, and a cell support plate 50a on which the fuel cell 33 is set up is provided in the manifold 50. The gas in the manifold 50 is contained in the fuel cell 33. It is derived through the gas flow path 34.

  As for the manufacturing method of the solid oxide fuel cell stack configured as described above, as shown in FIG. 5 of Patent Document 2, the fuel cell 33 is inserted into the hole of the annular glass socket 75 made of a bonding material. The fuel battery cell 33 is inserted into the cell support plate 50a and the fuel battery cell 33 is inserted into the cell insertion hole 50a1 of the cell support plate 50a, and the glass socket 75 is fitted around the cell insertion hole 50a1 of the fuel battery cell 33. The glass socket 75 is heated above the softening temperature of the glass, the fuel cell 33 is joined to the cell support plate 50a, and the fuel cell 33 is erected on the cell support plate 50a.

  As another type of the solid oxide fuel cell stack, the one shown in Patent Document 3 is known. As shown in FIG. 5 of Patent Document 3, the solid oxide fuel cell stack (fuel cell stack 14) includes 16 fuel cell units 16, and lower ends of these fuel cell units 16. The side and the upper end side are supported by a ceramic lower support plate 68 and an upper support plate 100, respectively. The lower support plate 68 and the upper support plate 100 are formed with through holes 68a and 100a through which the inner electrode terminal 86 can pass. The inner electrode terminal 86 and the outer electrode layer 92 at both ends of the fuel cell unit 16 are electrically connected by the current collector 102.

JP 2004-119300 A JP 2005-158531 A JP 2011-210632 A

  In the solid oxide fuel cell stack described in Patent Document 1 described above, the lower end 5 of the solid oxide fuel cell 13 is connected to the lower partition wall 8 at a joint 7, and the solid oxide fuel cell stack is connected. Although the upper end 17 of the physical fuel cell 13 passes through the upper partition wall 14, when assembling the solid oxide fuel cell 13 to the lower partition wall 8, a jig for holding and positioning the cell 13 is provided. Necessary. In the solid oxide fuel cell stack described in Patent Document 2 described above, when the fuel cell 33 is assembled to the cell support plate 50a, the fuel cell 33 is inserted into the cell insertion hole 50a1 of the cell support plate 50a. Although it can be positioned in the radial direction by inserting it in, it cannot be positioned in the longitudinal direction. Furthermore, in the solid oxide fuel cell stack described in Patent Document 3 described above, when the fuel cell unit 16, the lower support plate 68, the upper support plate 100, and the current collector 102 are assembled, the holding positioning is performed. A jig is required. Thus, in any solid oxide fuel cell stack, when assembling the solid oxide fuel cell stack, there is a problem that the assemblability of the solid oxide fuel cell stack itself is poor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the assembly of the solid oxide fuel cell stack itself in the solid oxide fuel cell stack.

  In order to solve the above-mentioned problems, a solid oxide fuel cell stack according to claim 1 includes a base member, a fuel that is formed in a cylindrical shape by standing through the base member and standing on the base member. An inner electrode layer in which either one of the oxidant gases flows from one end side to the other end side, and one of the fuel and the oxidant gas stacked on the outer side of the inner electrode layer from the one end side to the other end side A plurality of solid oxide fuel cell tubular cells having an outer electrode layer that circulates toward the inner surface, an electrolyte layer sandwiched between the inner electrode layer and the outer electrode layer, and a fuel offgas and an oxidant of the base member Each solid oxide fuel cell cylindrical cell is press-fitted into each through-hole and is disposed in contact with the combustion part side where off-gas burns. Thermal insulation member for thermal insulation and solid oxide fuel cell cylinder A sealing member that seals between the cell and a through hole formed in the base member, and a plurality of solid oxide fuel cell cylindrical cells are electrically connected in series, and one solid oxide fuel cell cylinder Inner electrode layer connected portion provided on the inner electrode layer of the cylindrical cell, and outer electrode layer of another solid oxide fuel cell cylindrical cell electrically adjacent to one solid oxide fuel cell cylindrical cell A connecting member that connects to the outer electrode layer connected portion provided on the heat insulating member, and a connecting member that is disposed in part in contact with the combustion portion side of the heat insulating member.

  According to this, since each solid oxide fuel cell cylindrical cell is press-fitted into each through hole of the heat insulating member, it can be temporarily fixed without using a jig or the like. Therefore, when assembling the solid oxide fuel cell tubular cell to the base member, each solid oxide fuel cell tubular cell is temporarily fixed to the heat insulating member disposed in contact with the combustion portion side surface of the base member. Therefore, the positioning of the solid oxide fuel cell cylindrical cell in the radial direction is possible as well as the positioning of the solid oxide fuel cell cylindrical cell in the longitudinal direction, and the solid oxide fuel cell cylindrical cell can be positioned relative to the base member of the solid oxide fuel cell cylindrical cell. Assembling property can be improved. Furthermore, a part of the connecting member that connects one solid oxide fuel cell cylindrical cell and another solid oxide fuel cell cylindrical cell is disposed in contact with the combustion part side of the heat insulating member. Therefore, the connecting member can be accurately positioned with respect to the solid oxide fuel cell cylindrical cell without using a jig or the like. Therefore, the assembling property of the connecting member to the solid oxide fuel cell cylindrical cell can be improved. Therefore, the assemblability of the solid oxide fuel cell stack itself can be improved.

The invention according to claim 2 is the assembly according to claim 1, wherein the solid oxide fuel cell cylindrical cell is attached and fixed to the base member, and one end of the solid oxide fuel cell cylindrical cell comes into contact with the longitudinal direction of the solid oxide fuel cell cylindrical cell. A support plate for positioning and supporting is further provided.
According to this, when the solid oxide fuel cell cylindrical cell is assembled to the base member, the solid oxide fuel cell cylinder is brought into contact with the support plate at one end of the solid oxide fuel cell cylindrical cell. The cell can be more reliably positioned in the longitudinal direction. Therefore, the assembly property with respect to the base member of the solid oxide fuel cell cylindrical cell can be further improved.

According to a third aspect of the present invention, in the solid oxide fuel cell cylindrical cell according to the first or second aspect, the outer electrode layer connected portion is formed on the other end side or one end side of the outer electrode layer. The inner electrode layer connected portion is formed on one end side or the other end side of the inner electrode layer, and is composed of one type, and the electrically adjacent solid oxide fuel cell tubular cells are Arranged in the base member so that the mounting directions in the longitudinal direction are the same, the connecting members are the outer electrode layer connected portion of one solid oxide fuel cell cylindrical cell and the other solid oxide fuel cell It is comprised so that the inner side electrode layer to-be-connected part of a cylindrical cell may be connected.
According to this, in the solid oxide fuel cell stack in which the solid oxide fuel cell cylindrical cell is composed of one type, the assembly property of the solid oxide fuel cell stack itself can be improved. .

According to a fourth aspect of the present invention, in the solid oxide fuel cell cylindrical cell according to the first or second aspect, the first outer electrode layer connected portion is formed on the other end side of the outer electrode layer. A first type in which a first inner electrode layer connected portion is formed on one end side of the inner electrode layer, and a second inner electrode layer connected portion is formed on the other end side of the inner electrode layer and the outer electrode layer It is composed of two types, the second type in which the second outer electrode layer connected portion is formed on one end side, and the electrically adjacent solid oxide fuel cell cylindrical cells are in the longitudinal direction. The connecting member is arranged on the base member so that the mounting direction of the first electrode is opposite, and the connecting member is connected to the outer electrode layer connected portion of one first type solid oxide fuel cell cylindrical cell and the other second type. It is configured to connect the inner electrode layer connected portion of the solid oxide fuel cell cylindrical cell. It is.
According to this, in the solid oxide fuel cell stack in which the solid oxide fuel cell cylindrical cell is composed of two types, the assemblability of the solid oxide fuel cell stack itself can be improved. .

According to a fifth aspect of the present invention, in the solid oxide fuel cell cylindrical cell according to the first or second aspect, the one end of the inner electrode layer is exposed and the other end of the inner electrode layer is exposed. Is covered with an outer electrode layer, and an inner electrode layer connected portion is formed at an exposed portion of one end portion of the inner electrode layer, and an outer electrode layer connected portion is formed at the other end portion of the outer electrode layer. The connecting member includes a first connecting portion electrically connected to the inner electrode layer connected portion, a second connecting portion electrically connected to the outer electrode layer connected portion, and a first A connecting portion that connects the connecting portion and the second connecting portion, and the solid oxide fuel cell tubular cell is interposed between the inner electrode layer connected portion and the first connecting portion of the connecting member. The first body portion for electrically connecting the inner electrode layer connected portion and the first connection portion of the connecting member; and A first cap that is communicated with the flow path formed in the inner electrode layer, and between the outer electrode layer connected portion and the second connecting portion of the connecting member. A second body part that electrically connects the outer electrode layer connected part and the second connection part of the connecting member, and a flow path that is provided in the second body part and formed in the inner electrode layer. A second cap provided with a second communication port portion that communicates, and the electrically adjacent solid oxide fuel cell cylindrical cells have a base member so that the mounting direction in the longitudinal direction is reversed Of the first cap and the second cap, the communication port portion of each cap closer to the base member is provided through each through hole formed in the base member. Seals between each through hole of the cap on the side close to the member and each through hole. .
According to this, the solid oxide fuel cell cylindrical cell is composed of one type, and the first cap and the solid oxide type provided at one of both ends of the solid oxide fuel cell cylindrical cell. In the solid oxide fuel cell stack provided with the second cap provided at the other end of both ends of the fuel cell cylindrical cell, the assemblability of the solid oxide fuel cell stack itself can be improved.

The invention of a solid oxide fuel cell module according to claim 6 is the solid oxide fuel cell stack according to any one of claims 1 to 5 and combustion of the solid oxide fuel cell stack. An evaporation section that is heated by the gas to evaporate the supplied reforming water to generate steam and preheats the supplied reforming fuel, and a mixed gas of steam and reforming fuel supplied from the evaporation section; And a reforming section for generating reformed gas as fuel.
According to this, in the solid oxide fuel cell module, it is possible to obtain the operations and effects related to the solid oxide fuel cell stack according to claims 1 to 5 described above.

The invention of a solid oxide fuel cell system according to claim 7 is a solid oxide fuel cell system comprising a power generation unit and a hot water storage tank for storing hot water. The heat exchange is performed between the solid oxide fuel cell module according to Item 6 and the combustion exhaust gas exhausted from the solid oxide fuel cell module and the hot water supplied from a hot water storage tank to condense the combustion exhaust gas. A heat exchanger that discharges condensed water, a water tank that purifies the condensed water discharged from the heat exchanger, and a controller that controls the operation of the solid oxide fuel cell system by driving an auxiliary device; And a power converter that converts at least DC power output from the solid oxide fuel cell module to AC power and outputs the AC power to a power supply line connected to an AC system power supply.
According to this, in the solid oxide fuel cell system, it is possible to obtain the operations and effects related to the solid oxide fuel cell stack according to claims 1 to 5 described above.

It is a schematic diagram showing an outline of a first embodiment of a solid oxide fuel cell system according to the present invention. FIG. 2 is a cut end view of the solid oxide fuel cell module shown in FIG. 1 cut in a direction along the longitudinal direction of the solid oxide fuel cell cylindrical cell. FIG. 3 is a plan view showing the inside of the solid oxide fuel cell stack shown in FIG. 2 (particularly, a state where a cover, an evaporation unit, and a reforming unit are not mounted). It is a side view which shows a set of 1st type solid oxide fuel cell cylindrical cell and 2nd type solid oxide fuel cell cylindrical cell shown in FIG. FIG. 3 is a partially enlarged cross-sectional view along the longitudinal direction of the solid oxide fuel cell cylindrical cell showing the assembled state of the solid oxide fuel cell cylindrical cell shown in FIG. 2. FIG. 5 is a partially enlarged cross section along the radial direction (direction along the plane perpendicular to the longitudinal direction) of the solid oxide fuel cell cylindrical cell showing the connection portion between the solid oxide fuel cell cylindrical cell and the connection member shown in FIG. FIG. It is the cut part end elevation which cut | disconnected the solid oxide fuel cell module of the solid oxide fuel cell system which concerns on 2nd embodiment in the direction along the longitudinal direction of a solid oxide fuel cell cylindrical cell. It is a side view which shows the solid oxide fuel cell cylindrical cell shown in FIG. It is the elements on larger scale along the longitudinal direction of the solid oxide fuel cell cylindrical cell which shows the assembly | attachment state of the solid oxide fuel cell cylindrical cell shown in FIG. It is a top view which shows the connection member shown in FIG. It is the cut part end elevation which cut | disconnected the solid oxide fuel cell module of the solid oxide fuel cell system which concerns on 3rd embodiment in the direction along the longitudinal direction of a solid oxide fuel cell cylindrical cell. It is a side view which shows the connection member shown in FIG. It is a top view which shows the connection member shown in FIG.

(First embodiment)
Hereinafter, a first embodiment of a solid oxide fuel cell system according to the present invention will be described. FIG. 1 is a schematic diagram showing an outline of this solid oxide fuel cell system. This solid oxide fuel cell system 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, an inverter 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 raw materials for reforming, reforming water and cathode 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 material supply pipe 11a to which the reforming material is supplied. The reforming material supply pipe 11a is provided with a material pump 11a1. 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 the cathode 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 the figure). 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.

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

  As illustrated in FIG. 2, the solid oxide fuel cell module 11 includes a solid oxide fuel cell stack 30, an evaporation unit 40, and a reforming unit 50. The solid oxide fuel cell stack 30 includes a base member 31, a heat insulating member 32, a solid oxide fuel cell cylindrical cell 33 (corresponding to a solid oxide fuel cell cylindrical cell), a connection member 34, a cover 35, and an anode. A gas manifold 36 and a cathode gas manifold 37 are provided.

The base member 31 is a metal plate (for example, ferritic stainless steel, austenitic stainless steel, chrome-iron-yttria alloy, etc., but ferritic stainless steel is particularly suitable) and has a square plate shape. Is formed. A heat insulating member 32 is provided on the upper surface of the base member 31. The heat insulation member 32 insulates the other end side and one end side which are the combustion part 60 side mentioned later. Further, the heat insulating member 32 insulates 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 from a material having insulating properties, heat insulating properties, and flexibility (elasticity) (for example, ceramic made from alumina, magnesia, silica, or a mixed material thereof). The thickness and material of the heat insulating member 32 are determined so that the temperature on the base member 31 side is equal to or lower than a predetermined temperature. The predetermined temperature is desirably equal to or lower than the heat resistant temperature of the seal member 31b. In this embodiment, the sealing member 31b is a flexible silicone-based sealing material, and its heat resistant temperature is, for example, 200 ° C. The heat insulating member 32 is disposed in the central portion of the base member 31, that is, in the standing range of the solid oxide fuel cell cylindrical cell 33. A plurality of through holes 32a are formed in this standing range. Since the heat insulating member 32 has flexibility, the solid oxide fuel cell cylindrical cell 33 can be press-fitted into the through hole 32a even if the through hole 32a has a slightly smaller diameter than the solid oxide fuel cell cylindrical cell 33. It becomes possible.
The heat insulating member 32 is placed in contact with the upper surface of the base member 31. On the upper surface of the heat insulating member 32, at least a part of the connecting member 34 is placed in contact. The heat insulating member 32 is used as a positioning jig in the height direction of the connecting member 34 (the direction along the longitudinal direction of the solid oxide fuel cell cylindrical cell 33).

  The solid oxide fuel cell cylindrical cell 33 is a cell formed in a cylindrical shape. The solid oxide fuel cell cylindrical cell 33 is basically composed of a fuel electrode layer 33a, an electrolyte layer 33b, a reaction preventing layer (not shown), and an air electrode layer 33c, which are stacked in order from the inside in the radial direction. ing. As the reaction preventing layer, for example, a ceria mixture doped with rare earth such as GDC (gadolinium doped ceria), YDC (yttria doped ceria), SDC (samarium doped ceria), or the like is used. The fuel electrode layer 33a is an inner electrode layer that is formed in a cylindrical shape and in which one of the fuel and the oxidant gas flows from one end side (lower end side) to the other end side (upper end side). The air electrode layer 33c is an outer electrode layer that is laminated on the outer side of the fuel electrode layer 33a and in which one of the fuel and the oxidant gas flows from one end side to the other end side.

  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. Mixtures of rare earth elements such as Gd, Y and Sm with ceria doped with at least one kind, lanthanum gallate doped with catalytic metals such as Ni and Fe and at least one kind selected from Sr, Mg, Co, Fe and 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, It is formed from at least one 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. .

  The solid oxide fuel cell cylindrical cell 33 is composed of two types as shown in FIG. One first type 33-A (shown on the right side in FIG. 4) has a first air electrode layer connected portion 33c1 (first outer electrode layer connected portion) on the other end side (upper end side) of the air electrode layer 33c. And a first fuel electrode layer connected portion 33a1 (corresponding to a first inner electrode layer connected portion) is formed on one end side (lower end side) of the fuel electrode layer 33a. The electrolyte layer 33b and the air electrode layer 33c are not formed at the site of the first fuel electrode layer connected portion 33a1, but only the fuel electrode layer 33a is provided. The positions of the first air electrode layer connected portion and the first fuel electrode layer connected portion may not be on the end side, but may be at predetermined positions in the longitudinal direction of the solid oxide fuel cell cylindrical cell 33. .

The other second type 33-B (shown on the left side in FIG. 4) is a second fuel electrode layer connected portion 33a2 (corresponding to a second inner electrode layer connected portion) on the other end side of the fuel electrode layer 33a. And a second air electrode layer connected portion 33c2 (second outer electrode layer connected portion) is formed on one end side of the air electrode layer 33c. The electrolyte layer 33b and the air electrode layer 33c are not formed at the site of the second fuel electrode layer connected portion 33a2, and only the fuel electrode layer 33a is provided. The positions of the second fuel electrode layer connected portion and the second air electrode layer connected portion may not be on the end side, but may be at predetermined positions in the longitudinal direction of the solid oxide fuel cell cylindrical cell 33. .
An air electrode layer 33c is formed on one end side of both types 33-A and 33-B and on one end side from the first fuel electrode layer connected portion 33a1 and the second air electrode layer connected portion 33c2. Not. In the present embodiment, the solid oxide fuel cell cylindrical cell 33 is formed in a cylindrical shape, but may be formed in a square cross section as long as it is cylindrical.

  The method for forming the solid oxide fuel cell cylindrical cell 33 is not particularly limited. For example, the inner electrode layer is formed by a method such as extrusion, pressing, or casting, and the electrolyte and the outer electrode layer are sequentially printed, dipped, and slurried. It can be formed by forming a film by a method such as coating. By these methods, the solid oxide fuel cell cylindrical cell 33 is formed 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 in accordance with this step, a portion where the fuel electrode layer 33a is exposed and a portion where the electrolyte layer 33b is exposed are formed. Moreover, it is also possible to produce by changing the diameter of an arbitrary part by locally forming a film.

  As shown in FIG. 5, the plurality of solid oxide fuel cell cylindrical cells 33 are erected through the base member 31 and the heat insulating member 32. A plurality of through holes 32 a having a slightly smaller diameter than the outer diameter of the solid oxide fuel cell cylindrical cell 33 are formed in the heat insulating member 32. Each solid oxide fuel cell cylindrical cell 33 is press-fitted into the corresponding through hole 32a, and the outer peripheral wall surface of each solid oxide fuel cell cylindrical cell 33 is in close contact with the inner peripheral surface of the through hole 32a. The base member 31 is formed with a plurality of through holes 31 a having a diameter slightly larger than the outer diameter of the solid oxide fuel cell cylindrical cell 33. Each solid oxide fuel cell cylindrical cell 33 is inserted into a corresponding through hole 31a. A space between the through hole 31a of the base member 31 and the solid oxide fuel cell cylindrical cell 33 is sealed with a seal member 31b. The seal member 31b is formed of a silicone-based seal material.

As shown in FIG. 2, the first type solid oxide fuel cell cylindrical cell 33-A and the second type solid oxide fuel cell cylindrical cell 33-B that are electrically adjacent to each other are installed in the longitudinal direction. Is disposed on the base member 31 so as to be reversed.
The connecting member 34 includes two electrically adjacent solid oxide fuel cell cylindrical cells 33 (that is, a first type solid oxide fuel cell cylindrical cell 33-A and a second type solid oxide fuel cell cylindrical cell). The electrode layer connected parts on the other end side or the electrode layer connected parts on one end side of the cell 33-B) are electrically connected. The connection member 34 on one end side connects the first fuel electrode layer connected portion 33a1 and the second air electrode layer connected portion 33c2. As shown in FIG. 6, the connecting member 34 is connected to the first fuel electrode layer connected portion 33a1 (fuel electrode layer connected portion: the second fuel electrode layer connected portion 33a2 on the other end side). Portion 34a, second air electrode layer connected portion 33c2 (air electrode layer connected portion: first air electrode layer connected portion 33c1), second connection portion 34b, first connection portion 34a and second A connecting portion 34c for connecting the connecting portion 34b. A through hole 34a1 is formed in the first connection portion 34a, and a through hole 34b1 is formed in the second connection portion 34b. The through hole 34 a 1 and the through hole 34 b 1 are set larger than the outer diameter of the solid oxide fuel cell cylindrical cell 33. The outer diameters of the through hole 34a1 and the through hole 34b1 are desirably set to be the same.

The connecting member 34 on the other end side is configured similarly to the connecting member 34 on the one end side, and connects the second fuel electrode layer connected portion 33a2 and the first air electrode layer connected portion 33c1. Thus, the plurality of solid oxide fuel cell cylindrical cells 33 are connected in series by the plurality of connection members 34. The fuel electrode layer connected portion (first fuel electrode layer connected portion 33a1 or second fuel electrode layer connected portion 33a2) and the first connecting portion 34a are connected by a conductive adhesive 34d. The air electrode layer connected portion (first air electrode layer connected portion 33c1 or second air electrode layer connected portion 33c2) and the second connection portion 34b are connected by a conductive adhesive 34d. As the conductive adhesive 34d, for example, a conductive paste such as platinum, silver, copper, or a silver-palladium alloy, or conductive ceramics can be used. As the conductive ceramic, for example, an ABO ₃ type perovskite oxide can be used, and in particular, a transition metal type perovskite oxide having La at the A site is preferably used. Among them, it is preferable to use a lanthanum cobaltite-based oxide having high electrical conductivity at a relatively low temperature as the conductive ceramic.

  Further, the entire lower surface of the connection member 34 located on the lower portion (the heat insulating member 32 side) is in contact with the upper surface of the heat insulating member 32. Also, the connecting portions at both ends of the solid oxide fuel cell cylindrical cells 33 connected in series are connected to the bus bar 38b via the bus bar connecting member 38a. The connection members 34 and 38a and the bus bar 38b can be formed using, for example, ferritic stainless steel, lanthanum chromite, or the like.

  The cover 35 is attached to the upper surface of the base member 31 as shown in FIG. The cover 35 is formed in a box shape having an opening that opens downward. In the sealed space R1 formed between the cover 35 and the base member 31, the upper part of the solid oxide fuel cell cylindrical cell 33, the evaporation part 40, and the reforming part 50 are accommodated. A flange 35a formed outward is formed in the opening of the cover 35. The flange 35a is in contact with the upper surface of the base member 31, and is fixed to the base member 31 with screws 35b. Yes. 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.

  The anode gas manifold 36 is attached to the lower surface of the base member 31. The anode gas manifold 36 is formed in a box shape having an opening that opens upward. The sealed space formed between the anode gas manifold 36 and the base member 31 accommodates the lower part of the solid oxide fuel cell cylindrical cell 33. A metal support plate 36 a is provided in the anode gas manifold 36. Since the lower end surface (one end surface) of the solid oxide fuel cell cylindrical cell 33 is disposed in contact with the support plate 36a, the solid oxide fuel cell cylindrical cell 33 is positioned in the longitudinal direction.

  An insulating plate 36b that insulates the members 36a and 33 is provided between the support plate 36a and the solid oxide fuel cell cylindrical cell 33. Further, through holes 36a1 and 36b1 (see FIG. 5) through which the anode gas passes are provided at positions (indicated by arrows in FIG. 2) corresponding to the solid oxide fuel cell cylindrical cells 33 on the support plate 36a and the insulating plate 36b. Each is formed. In addition, an anode gas supply pipe 36c is connected to the anode gas manifold 36. One end of the anode gas manifold 36 is connected to the reforming unit 50 to supply anode gas.

  The cathode gas manifold 37 is provided in the space R1. The cathode gas manifold 37 is disposed below the solid oxide fuel cell cylindrical cell 33 projecting upward from the heat insulating member 32. The cathode gas manifold 37 is disposed around the heat insulating member 32. In the upper part of the cathode gas manifold 37, a plurality of outflow holes (indicated by arrows in FIG. 2) through which the cathode gas flows out are formed. The cathode gas manifold 37 is connected to a cathode gas supply pipe 37a to which cathode gas is supplied.

  The evaporating unit 40 is heated by a combustion gas to be described later, evaporates the supplied reforming water to generate water vapor, and preheats the supplied reforming raw material. The evaporation unit 40 mixes the steam generated in this way with the preheated reforming raw material and supplies it to the reforming unit 50. The reforming raw materials include gas fuels for reforming such as natural gas and LP gas, and liquid fuels for reforming such as kerosene, gasoline, and methanol. In this embodiment, natural gas will be described.

  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. The evaporating unit 40 is connected to a reforming material supply pipe 11a having one end connected to the supply source Gs. The supply source Gs is, for example, a gas supply pipe for city gas or a gas cylinder for LP gas.

  The reforming unit 50 is heated by the above-described combustion gas and supplied with heat necessary for the steam reforming reaction, so that the reformed gas is generated from the mixed gas (reforming raw material, steam) supplied from the evaporation unit 40. Is generated and derived. The reforming unit 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 gas and carbon monoxide. (So-called steam reforming reaction). 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. As described above, the reforming unit 50 generates reformed gas (fuel) from the reforming raw material (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.

  The combustion unit 60 is provided between each solid oxide fuel cell cylindrical cell 33, the evaporation unit 40, and the reforming unit 50. The combustion unit 60 combusts the anode off-gas (fuel off-gas) from the solid oxide fuel cell cylindrical cell 33 and the cathode off-gas (oxidant off-gas) from the solid oxide fuel cell cylindrical cell 33 to reform the reforming unit 50. Heat.

  According to the first embodiment described above, the solid oxide fuel cell stack 30 includes a base member 31, and is erected on the base member 31 through the base member 31. A fuel electrode layer 33a (inner electrode layer) that circulates from the side (lower end side) to the other end side (upper end side), and an oxidant gas that is laminated outside the fuel electrode layer 33a is directed from one end side to the other end side. A plurality of solid oxide fuel cell cylindrical cells 33 having an air electrode layer 33c (outer electrode layer) that circulates and the base member 31 on the combustion unit 60 side where the fuel off-gas and the oxidant off-gas burn. A heat insulating member 32 which is disposed in contact with each other and each solid oxide fuel cell cylindrical cell 33 is press-fitted into each through hole 32a to insulate the other end side and one end side which are the combustion unit 60 side; A solid oxide fuel cell cylindrical cell 33; A sealing member 31b for sealing between the through hole 31a formed in the support member 31, an inner electrode layer connected portion provided in the fuel electrode layer 33a of one solid oxide fuel cell cylindrical cell 33, and one A connecting member for connecting the outer electrode layer connected portion provided in the air electrode layer 33c of another solid oxide fuel cell cylindrical cell 33 adjacent to the solid oxide fuel cell cylindrical cell 33 of And a connection member 34 that is disposed in part in contact with the combustion part 60 side of the heat insulating member 32.

  According to this, since each solid oxide fuel cell cylindrical cell 33 is press-fitted into each through hole 32a of the heat insulating member 32, it can be temporarily fixed without using a jig or the like. Therefore, when the solid oxide fuel cell cylindrical cell 33 is assembled to the base member 31, each solid oxide fuel cell cylindrical cell 33 is disposed on the heat insulating member 32 disposed in contact with the side of the combustion portion 60 of the base member 31. Therefore, the solid oxide fuel cell cylindrical cell 33 can be positioned in the longitudinal direction as well as the solid oxide fuel cell cylindrical cell 33 in the radial direction. Assembling property with respect to the base member 31 can be improved. Furthermore, a part of the connecting member 34 that connects one solid oxide fuel cell cylindrical cell 33 and another solid oxide fuel cell cylindrical cell 33 is disposed in contact with the combustion part 60 side of the heat insulating member 32. Therefore, the connecting member 34 can be accurately positioned with respect to the solid oxide fuel cell cylindrical cell 33 without using a jig or the like. Therefore, the assembling property of the connecting member 34 to the solid oxide fuel cell cylindrical cell 33 can be improved. Therefore, the assemblability of the solid oxide fuel cell stack 30 itself can be improved.

  Furthermore, the thickness and material of the heat insulating member 32 are set so that the temperature on the base member 31 side is equal to or lower than the heat resistant temperature (predetermined temperature) of the seal member 31b. As a result, during power generation of the solid oxide fuel cell system, the temperature on the other end side (upper surface side) of the heat insulating member 32 is 600 to 1000 ° C., but the temperature on one end side (lower surface side) of the heat insulating member 32 is 200. It can be below ℃. Thereby, the sealing member 31b between the through hole 31a of the base member 31 and the solid oxide fuel cell cylindrical cell 33 can be changed from a glass-based sealing material to a flexible silicone-based sealing material. . Therefore, the through hole 31a of the base member 31 and the solid oxide fuel cell cylindrical cell 33 are sealed with the seal member 31b made of a silicone-based seal material. Thereby, the thermal stress which generate | occur | produces in the sealing member 31b at the time of the thermal cycle by starting / stopping of a solid oxide fuel cell system can be absorbed (suppressed) by deformation | transformation of the sealing member 31b itself. Further, by using a flexible sealing material, it is possible to easily perform a sealing process, and it is possible to reliably ensure the sealing performance.

Further, the solid oxide fuel cell stack 30 is assembled and fixed to the base member 31, and one end of the solid oxide fuel cell cylindrical cell 33 comes into contact therewith to position the solid oxide fuel cell cylindrical cell 33 in the longitudinal direction. A support plate 36a is further provided.
According to this, when the solid oxide fuel cell cylindrical cell 33 is assembled to the base member 31, the solid oxide fuel cell cylindrical cell 33 is brought into contact with the support plate 36 a at one end of the solid oxide fuel cell cylindrical cell 33. The battery cylindrical cell 33 can be more reliably positioned in the longitudinal direction. Therefore, the assembling property of the solid oxide fuel cell cylindrical cell 33 with respect to the base member 31 can be further improved.

Further, in the solid oxide fuel cell cylindrical cell 33, the first air electrode layer connected portion 33c1 (first outer electrode layer connected portion) is formed on the other end side of the air electrode layer 33c, and the fuel electrode layer 33a. The first fuel electrode layer connected portion 33a1 (first inner electrode layer connected portion) is formed on one end side of the first type 33-A, and the second fuel electrode layer on the other end side of the fuel electrode layer 33a. A connected portion 33a2 (second inner electrode layer connected portion) is formed, and a second air electrode layer connected portion 33c2 (second outer electrode layer connected portion) is formed on one end side of the air electrode layer 33c. The second type 33-B is composed of two types, and the connecting member 34 is connected to the outer electrode layer connected portion of the solid oxide fuel cell cylindrical cell 33 of the first type 33-A. (First air electrode layer connected portion 33c1 or second air electrode layer connected portion 33c2) and Connecting the inner electrode layer connected portion (second fuel electrode layer connected portion 33a2 or first fuel electrode layer connected portion 33a1) of another second type 33-B solid oxide fuel cell cylindrical cell 33. It is configured as follows.
According to this, in the solid oxide fuel cell stack 30 in which the solid oxide fuel cell cylindrical cell 33 is composed of two types, the assembly property of the solid oxide fuel cell stack 30 itself is improved. Can do.

  Further, the solid oxide fuel cell module 11 is heated by the solid oxide fuel cell stack 30 and the combustion gas of the solid oxide fuel cell stack 30, and the supplied reforming water is evaporated to generate water vapor. And an evaporator 40 for preheating the supplied reforming fuel, a reforming unit 50 for generating a reformed gas as a fuel from the mixed gas of the steam and the reforming fuel supplied from the evaporator 40, It has. According to this, the solid oxide fuel cell module 11 can obtain the operations and effects related to the solid oxide fuel cell stack 30 described above.

  The solid oxide fuel cell system is a solid oxide fuel cell system including a power generation unit 10 and a hot water storage tank 21 for storing hot water, and the power generation unit 10 has a solid oxide type. Heat exchange is performed between the fuel cell module 11 and the combustion exhaust gas exhausted from the solid oxide fuel cell module 11 and the hot water supplied from the hot water storage tank 21 to condense the combustion exhaust gas and discharge condensed water. A heat exchanger 12, a water tank 14 for purifying condensed water discharged from the heat exchanger 12, a controller 15 for driving the auxiliary equipment to control the operation of the solid oxide fuel cell system, and at least An inverter device 13 (power conversion device) that converts DC power output from the solid oxide fuel cell module 11 into AC power and outputs the AC power to a power line connected to an AC power supply; It is equipped with a. According to this, the solid oxide fuel cell system can obtain the operations and effects related to the solid oxide fuel cell stack 30 described above.

  In the embodiment described above, the inner electrode layer is the fuel electrode layer 33a and the outer electrode layer is the air electrode layer 33c. However, the inner electrode layer is the air electrode layer 33c through which air (oxidant gas) flows, The outer electrode layer may be a fuel electrode layer 33a through which fuel flows.

(Second embodiment)
Hereinafter, a second embodiment of the solid oxide fuel cell system according to the present invention will be described. FIG. 7 is a cut end view of the solid oxide fuel cell module of the solid oxide fuel cell system according to the second embodiment cut in a direction along the longitudinal direction of the solid oxide fuel cell cylindrical cell. . The solid oxide fuel cell stack 130 of the solid oxide fuel cell system according to the second embodiment is different from the above-described solid oxide fuel cell stack 30 in the following points. The solid oxide fuel cell cylindrical cell 133 is not composed of two types, but is composed of one type. The connection member 134 is formed in a flat plate shape. At both ends of the solid oxide fuel cell cylindrical cell 133, there are first and second caps 71 and 72 that electrically connect the connected portions 133a1 and 133c1 (or 133a2 and 133c2) at both ends and the connecting member 134, respectively. Is provided. The anode gas manifold 36 is not provided with a metal support plate 36a (insulating plate 36b). In addition, what is comprised similarly to 1st embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 8, the solid oxide fuel cell cylindrical cell 133 (corresponding to the solid oxide fuel cell cylindrical cell) has one end portion (corresponding to the inner electrode layer) of the fuel electrode layer 133a (corresponding to the inner electrode layer). The upper end portion in FIG. 8 is exposed, and the other end portion (lower end portion in FIG. 8) of the fuel electrode layer 133a is covered with the air electrode layer 133c (corresponding to the outer electrode layer). Yes. A fuel electrode layer connected portion 133a1 is formed in the exposed portion of the upper end portion of the fuel electrode layer 133a, and an air electrode layer connected portion 133c1 is formed in the lower end portion of the air electrode layer 133c.

  The solid oxide fuel cell cylindrical cell 133 further includes a first cap 71 and a second cap 72. The first cap 71 and the second cap 72 are formed of a metal material (for example, ferritic stainless steel) similarly to the base member. The first cap 71 includes a first main body portion 71a and a first series of opening portions 71b. The first main body portion 71a is interposed between the fuel electrode layer connected portion 133a1 and the first connection portion 134a of the connecting member 134 to electrically connect the fuel electrode layer connected portion 133a1 and the first connection portion 134a. Connecting. Specifically, as shown in FIG. 9, the first main body 71 a is formed in a bottomed cylindrical shape. The first main body 71a is disposed so that the inner wall surface of the first main body 71a covers the exposed portion of the fuel electrode layer 133a (including the fuel electrode layer connected portion 133a1). The inner wall surface (including the inner peripheral side surface and the bottom surface) of the first main body 71a and the fuel electrode layer connected portion 133a1 are connected by the conductive adhesive 71c similar to the conductive adhesive 34d described above. The inner wall surface of the first main body portion 71a and the fuel electrode layer connected portion 133a1 also have a portion (for example, the bottom surface) in direct contact.

  The first communication port 71b is provided in the first main body 71a and communicates with a flow path formed in the fuel electrode layer 133a. The first continuous passage portion 71b is formed in a cylindrical shape and is erected from the bottom wall of the first main body portion 71a toward the side opposite to the fuel electrode layer 133a.

  The second cap 72 includes a second main body portion 72a and a second communication port portion 72b. The second main body portion 72a is interposed between the air electrode layer connected portion 133c1 and the second connection portion 134b of the connecting member 134, and electrically connects the air electrode layer connected portion 133c1 and the second connection portion 134b. Connecting. Specifically, as shown in FIG. 9, the second main body 72 a is formed in a bottomed cylindrical shape. The second main body portion 72a is disposed so that the inner wall surface of the second main body portion 72a covers the end of the air electrode layer 133c (air electrode layer connected portion 133c1). The inner wall surface (including the inner peripheral side surface and the bottom surface) of the second main body portion 72a and the air electrode layer connected portion 133c1 are connected by the conductive adhesive 72c similar to the conductive adhesive 34d described above. The inner wall surface of the second main body portion 72a and the air electrode layer connected portion 133c1 also have a portion (for example, the bottom surface) in direct contact. Further, the end portion and the inner wall surface of the fuel electrode layer 133a are formed of the same material as the electrolyte layer 133b to form an insulating portion 133b1. The insulating part 133b1 insulates the fuel electrode layer 133a from the second cap 72.

  The second communication port portion 72b communicates with a flow path provided in the second main body portion 72a and formed in the fuel electrode layer 133a. The second communication port portion 72b is formed in a cylindrical shape and is erected from the bottom wall of the second main body portion 72a toward the side opposite to the fuel electrode layer 133a.

  Of the first cap 71 and the second cap 72, the communication port portion (the first serial port portion 71 b or the second communication port portion 72 b) disposed on the side far from the base member 31 is a through hole (penetration) of the connection member 134. It penetrates through the hole 134a1 or the through hole 134b1). The first serial opening portion 71b and the through hole 134a1 (first connection portion 134a) are connected by a conductive adhesive 134d similar to the conductive adhesive 34d. The second communication port portion 72b and the through hole 134b1 (second connection portion 134b) are also connected by the conductive adhesive 134d.

  Of the first cap 71 and the second cap 72, the communication port portion (the first serial port portion 71 b or the second communication port portion 72 b) disposed on the side closer to the base member 31 is a through hole (penetration) of the connection member 134. Hole 134 a 1 or through hole 134 b 1), through hole 32 a of heat insulating member 32 and through hole 31 a of base member 31. Each communication port and each through hole are connected by a conductive adhesive 134d.

The through-hole 32a of the heat insulating member 32 is formed to be slightly smaller than the outer shape of the first continuous port portion 71b and the second communication port portion 72b. Each first serial port 71b and second communication port 72b are press-fitted into the corresponding through hole 32a, and the outer wall surface of each first serial port 71b and second communication port 72b is through hole 32a. It is in close contact with the inner wall surface. In addition, the through hole 31a of the base member 31 is formed to be slightly larger than the outer shapes of the first continuous port portion 71b and the second communication port portion 72b. A space between the through hole 31a of the base member 31 and the first serial opening 71b and the second communication opening 72b is sealed with a silicone seal member 31b.
As shown in FIG. 9, the electrically adjacent solid oxide fuel cell cylindrical cells 133 are arranged on the base member 31 so that the mounting directions in the longitudinal direction are reversed.

  The first main body portion 71a and the second main body portion 72a may be formed with the same dimensions. The first main body portion 71a has an inner diameter dimension slightly larger than the outer diameter dimension of the fuel electrode layer 133a and the second main body section. The inner diameter of 72a may be formed to be slightly larger than the outer diameter of the air electrode layer 133c. Moreover, the longitudinal direction length of the communication port part (the 1st continuous port part 71b or the 2nd communication port part 72b) arrange | positioned in the side near the base member 31 among the 1st cap 71 and the 2nd cap 72 is connected. It is set to at least a value larger than the total thickness of the member 134, the heat insulating member 32, and the base member 31. Of the first cap 71 and the second cap 72, the length in the longitudinal direction of the communication port portion (the first series of port portions 71b or the second communication port portion 72b) disposed on the side far from the base member 31 is closer to the side. It may be the same as the communication port portion to be arranged, or may be short (however, it is set to a value larger than the thickness of the connecting member 134).

  As shown in FIG. 10, the connecting member 134 includes a first connecting portion 134a electrically connected to the fuel electrode layer connected portion 133a1 (inner electrode layer connected portion), and an air electrode layer connected portion 133c1 (outer side). A second connecting portion 134b electrically connected to the electrode layer connected portion), and a connecting portion 134c for connecting the first connecting portion 134a and the second connecting portion 134b. The connection member 134 can be formed using, for example, ferritic stainless steel, lanthanum chromite, or the like.

  The first connection part 134a is formed with a through hole 134a1 through which the first series opening part 71b of the first cap 71 passes. A through hole 134b1 through which the second communication port portion 72b of the second cap 72 passes is formed in the second connection portion 134b. The through hole 134a1 is set to be larger than the outer diameter of the first series opening 71b. The through hole 134b1 is set larger than the outer diameter of the second communication port portion 72b. It is desirable that the outer diameter dimensions of the through hole 134a1 and the through hole 134b1 are set to be the same.

According to the second embodiment configured as described above, the solid oxide fuel cell cylindrical cell 133 is formed of one type and provided at one of both end portions of the solid oxide fuel cell cylindrical cell 133. The solid oxide fuel cell stack includes a first cap 71 and a second cap 72 provided at the other end of the solid oxide fuel cell cylindrical cell 133. The solid oxide fuel cell stack itself Assemblability can be improved.
Also according to the second embodiment, the functions and effects of the first embodiment described above can be obtained.

(Third embodiment)
Hereinafter, a third embodiment of the solid oxide fuel cell system according to the present invention will be described. FIG. 11 is a cross-sectional end view of the solid oxide fuel cell module of the solid oxide fuel cell system according to the third embodiment cut in a direction along the longitudinal direction of the solid oxide fuel cell cylindrical cell. . The solid oxide fuel cell stack 230 of the solid oxide fuel cell system according to the third embodiment is different from the above-described solid oxide fuel cell stack 230 in the following points. The solid oxide fuel cell cylindrical cell 33 is not composed of two types, but one of the two types (in this embodiment, the second type solid oxide fuel cell cylindrical cell 33-B). ) Only. The electrically adjacent solid oxide fuel cell cylindrical cells 33 are arranged on the base member 31 so that the mounting directions in the longitudinal direction are the same. The connecting member 234 is formed such that the first connecting portion 234 a and the second connecting portion 234 b are at different positions in the longitudinal direction of the solid oxide fuel cell cylindrical cell 33. In addition, what is comprised similarly to 1st embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 11, the second type solid oxide fuel cell cylindrical cell 33 -B is disposed on the base member 31 so that the mounting direction in the longitudinal direction is the same. That is, all the solid oxide fuel cell cylindrical cells 33 are arranged on the base member 31 such that the other end side of the fuel electrode layer 33a is exposed on the upper end side. A second fuel electrode layer connected portion 33a2 (inner electrode layer connected portion) is formed in the exposed portion. Further, since the lower end surface (one end surface) of the second type solid oxide fuel cell cylindrical cell 33-B is in contact with the support plate 36a and positioned in the longitudinal direction, the second type solid oxide fuel cell Position where second air electrode layer connected portion 33c2 (outer electrode layer connected portion) formed on one end side of air electrode layer 33c of cylindrical cell 33-B is set a predetermined distance above the upper surface of heat insulating member 32. Is positioned.

  The connection member 234 is electrically connected to the second air electrode layer connected portion 33c2 of one solid oxide fuel cell cylindrical cell 33-B and one solid oxide fuel cell cylindrical cell 33-B. The solid oxide fuel cell cylindrical cell 33-B is connected to the second fuel electrode layer connected portion 33a2. As shown in FIGS. 12 and 13, the connecting member 234 is formed such that the first connecting portion 234 a and the second connecting portion 234 b are at different positions in the longitudinal direction of the solid oxide fuel cell cylindrical cell 33. ing.

  The connection member 234 includes a first connection portion 234a that is electrically connected to the fuel electrode layer connected portion 33a2, a second connection portion 234b that is electrically connected to the air electrode layer connected portion 33c2, and a first connection. A connecting portion 234c for connecting the portion 234a and the second connecting portion 234b. The connection member 234 can be formed using, for example, ferritic stainless steel, lanthanum chromite, or the like.

  A through hole 234a1 is formed in the first connection portion 234a, and a through hole 234b1 is formed in the second connection portion 234b. The through hole 234 a 1 and the through hole 234 b 1 are set larger than the outer diameter of the solid oxide fuel cell cylindrical cell 33. It is desirable that the outer diameters of the through hole 234a1 and the through hole 234b1 are set to be the same. The fuel electrode layer connected portion 33a2 and the first connection portion 234a, and the second air electrode layer connected portion 33c2 and the second connection portion 234b are connected by a conductive adhesive 34d.

The connecting portion 234 c extends along the longitudinal direction of the solid oxide fuel cell cylindrical cell 33, and the entire length of the air electrode layer 33 c (the solid oxide fuel cell cylindrical cell 33 protrudes from the upper surface of the heat insulating member 32. Are arranged so as to be in contact with the air electrode layer 33c. This contact portion is preferably bonded by a conductive adhesive 34d.
The second connection portion 234 b of the connection member 234 is disposed in contact with the upper surface of the heat insulating member 32. Thereby, the connecting member 234 is positioned in the longitudinal direction.

According to the third embodiment configured as described above, the solid oxide fuel cell cylindrical cell 33 is configured of one type, and the electrically adjacent solid oxide fuel cell cylindrical cell 33 is: In the solid oxide fuel cell stack disposed on the base member 31 so that the mounting directions in the longitudinal direction are the same, the assembly property of the solid oxide fuel cell stack itself can be improved.
Also according to the third embodiment, the functions and effects of the first embodiment described above can be obtained.

  In the embodiment described above, the solid oxide fuel cell cylindrical cell adopts the second type solid oxide fuel cell cylindrical cell 33-B, but the solid oxide fuel cell cylindrical cell is the first type. The solid oxide fuel cell cylindrical cell 33-A may be employed.

DESCRIPTION OF SYMBOLS 10 ... Power generation unit, 11 ... Solid oxide fuel cell module, 12 ... Heat exchanger, 13 ... Inverter device, 14 ... Water tank, 15 ... Control device, 16a ... System power supply, 16b ... Power supply line, 16c ... External power Load, 20 ... Waste heat recovery system, 21 ... Hot water storage tank, 22 ... Hot water storage water circulation line, 30 ... Solid oxide fuel cell stack, 31 ... Base member, 31a ... Through hole, 31b ... Seal member, 32 ... Heat insulation member, 32a ... through hole, 33 ... solid oxide fuel cell cylindrical cell (solid oxide fuel cell cylindrical cell), 33a ... fuel electrode layer (inner electrode layer), 33a1 ... first fuel electrode layer connected portion (first) One inner electrode layer connected portion), 33a2 ... second fuel electrode layer connected portion (first inner electrode layer connected portion), 33b ... electrolyte layer, 33c ... air electrode layer (outer electrode layer), 33c1 ... first Air electrode layer connected (First outer electrode layer connected portion), 33c2 ... second air electrode layer connected portion (second outer electrode layer connected portion), 34 ... connecting member, 34a ... first connecting portion, 34a1 ... through hole, 34b 2nd connection part, 34b1 ... Through hole, 34c ... Connecting part, 34d ... Conductive adhesive, 35 ... Cover, 36 ... Anode gas manifold, 36a ... Support plate, 36a1, 36b1 ... Through hole, 36b ... Insulating plate, 40 ... evaporation part, 50 ... reforming part, 60 ... combustion part, 71 ... first cap, 71a ... first main body part, 71b ... first series opening part, 71c ... conductive adhesive, 72 ... second cap 72a ... second main body portion, 72b ... second communication port portion, 72c ... conductive adhesive, 130 ... solid oxide fuel cell stack, 133 ... solid oxide fuel cell cylindrical cell, 134 ... connecting member, 230 ... Solid oxide fuel cell stack, 34 ... connecting member.

Claims (7)

A base member;
An inner electrode layer that passes through the base member and is erected on the base member, and is formed in a cylindrical shape and one of fuel and oxidant gas flows from one end side to the other end side; and the inner side An outer electrode layer laminated on the outer side of the electrode layer and one of the fuel and the oxidant gas flowing from the one end side toward the other end side, and sandwiched between the inner electrode layer and the outer electrode layer A plurality of solid oxide fuel cell tubular cells provided with an electrolyte layer;
The base member is disposed in contact with the combustion portion side where the fuel off-gas and the oxidant off-gas burn, and each solid oxide fuel cell cylindrical cell is press-fitted into each through-hole, and the combustion is performed. A heat insulating member that insulates the other end side and the one end side, which are part sides,
A seal member that seals between the solid oxide fuel cell cylindrical cell and a through hole formed in the base member;
A plurality of the solid oxide fuel cell cylindrical cells are electrically connected in series, and the inner electrode layer connected portion provided on the inner electrode layer of the one solid oxide fuel cell cylindrical cell; An outer electrode layer connected portion provided in the outer electrode layer of another solid oxide fuel cell cylindrical cell electrically adjacent to the one solid oxide fuel cell cylindrical cell is connected. A plurality of connecting members, wherein the connecting members are disposed in contact with a part of the heat insulating member on the combustion part side;
A solid oxide fuel cell stack.   And a support plate that is assembled and fixed to the base member and that positions and supports the solid oxide fuel cell cylindrical cell in the longitudinal direction by abutting one end of the solid oxide fuel cell cylindrical cell. 1. The fuel cell stack according to 1. In the solid oxide fuel cell cylindrical cell, the outer electrode layer connected portion is formed on the other end side or the one end side of the outer electrode layer, and the one end side or the other end of the inner electrode layer is formed. The inner electrode layer connected portion is formed on the side, and is composed of one type,
The electrically adjacent solid oxide fuel cell cylindrical cells are disposed on the base member so that the mounting directions in the longitudinal direction are the same,
The connecting member connects the outer electrode layer connected portion of the one solid oxide fuel cell cylindrical cell and the inner electrode layer connected portion of the other solid oxide fuel cell cylindrical cell. The solid oxide fuel cell stack according to claim 1 or 2, wherein the stack is configured to. The solid oxide fuel cell tubular cell has a first outer electrode layer connected portion formed on the other end side of the outer electrode layer and a first inner electrode layer cover on the one end side of the inner electrode layer. A first type in which a connecting portion is formed, a second inner electrode layer connected portion is formed on the other end side of the inner electrode layer, and a second outer electrode layer cover is formed on the one end side of the outer electrode layer. It is composed of two types, the second type where the connection part is formed,
The electrically adjacent solid oxide fuel cell tubular cells are disposed on the base member so that the mounting direction in the longitudinal direction is reversed,
The connecting member includes the outer electrode layer connected portion of the first type solid oxide fuel cell cylindrical cell and the inner side of the second type solid oxide fuel cell cylindrical cell. 3. The solid oxide fuel cell stack according to claim 1, wherein the solid oxide fuel cell stack is configured to connect the electrode layer connected portion. In the solid oxide fuel cell cylindrical cell, one end of the inner electrode layer is exposed, the other end of the inner electrode layer is covered with the outer electrode layer, and the inner electrode layer is covered with the inner electrode layer. The inner electrode layer connected portion is formed at the exposed portion of the one end portion of the electrode layer and the outer electrode layer connected portion is formed at the other end portion of the outer electrode layer,
The connection member includes a first connection portion electrically connected to the inner electrode layer connected portion, a second connection portion electrically connected to the outer electrode layer connected portion, and the first connection portion. And a connecting portion for connecting the second connecting portion,
The solid oxide fuel cell cylindrical cell is interposed between the inner electrode layer connected portion and the first connecting portion of the connecting member, and the inner electrode layer connected portion and the connecting member of the connecting member. A first body portion that electrically connects the first connection portion; and a first series of opening portions that are provided in the first body portion and communicate with a flow path formed in the inner electrode layer. The first cap, the outer electrode layer connected portion and the second connecting portion of the connecting member are interposed between the outer electrode layer connected portion and the second connecting portion of the connecting member. A second cap comprising: a second main body portion that is electrically connected; and a second communication port portion that is provided in the second main body portion and communicates with the flow path formed in the inner electrode layer; Further comprising
The electrically adjacent solid oxide fuel cell tubular cells are disposed on the base member so that the mounting direction in the longitudinal direction is reversed,
Of the first cap and the second cap, a communication port portion of each cap on the side close to the base member is provided through each through hole formed in the base member,
3. The solid oxide fuel cell stack according to claim 1, wherein the seal member seals between each communication port portion of the cap on the side close to the base member and each through hole. A solid oxide fuel cell stack according to any one of claims 1 to 5,
An evaporation section that is heated by the combustion gas of the solid oxide fuel cell stack, evaporates the supplied reforming water to generate water vapor, and preheats the supplied reforming fuel;
A reforming unit that generates a reformed gas that is the fuel from a mixed gas of the steam and the reforming fuel supplied from the evaporation unit;
A solid oxide fuel cell module. A power generation unit;
A hot water storage tank for storing hot water,
A solid oxide fuel cell system comprising:
The power generation unit is
A solid oxide fuel cell module according to claim 6;
A heat exchanger for exchanging heat between the combustion exhaust gas exhausted from the solid oxide fuel cell module and the hot water supplied from the hot water storage tank, condensing the combustion exhaust gas and discharging condensed water; ,
A water tank for purifying the condensed water discharged from the heat exchanger;
A control device for driving an auxiliary machine to control the operation of the solid oxide fuel cell system;
A power converter that converts at least DC power output from the solid oxide fuel cell module to AC power and outputs the AC power to a power line connected to an AC power supply; and
A solid oxide fuel cell system.

Images