Electrochemical reaction system

Abstract

In an electrochemical reaction system equipped with a cell stack formed by alternately stacking single cells and separators along a predetermined stacking direction, the system is made lighter and simpler overall, while appropriately applying pressing force to the cell stack along the stacking direction to suppress deterioration of sealing performance and system performance caused by reduced adhesion of seals and interconnects. [Solution] The cell stack 10 is installed with the stacking direction Z aligned with the vertical direction, and the gas processor 60 is installed above the cell stack 10. Gas processor weight transmission units X1 and X2 are interposed between the cell stack 10 and the gas processor 60 as pressing means X, which transmit the weight of the gas processor 60 to the cell stack 10 as pressing forces F1 and F2.

Description

Technical Field

[0001] The present invention relates to an electrochemical reaction system comprising: a cell stack formed by alternately stacking unit cells each consisting of an anode, a cathode, and an electrolyte layer interposed therebetween, and separators in which an anode-side gas channel facing the anode is defined on one surface and a cathode-side gas channel facing the cathode is defined on the other surface, along a predetermined stacking direction; a gas processor that processes gas transferred to and from a gas manifold communicating with at least one of the anode-side gas channel and the cathode-side gas channel of the cell stack; and a pressing means that applies a pressing force to the cell stack along the stacking direction.

Background Art

[0002] As an electrochemical reaction system provided with a flat plate-type cell stack formed by alternately stacking the above unit cells and the above separators along a predetermined stacking direction such as the vertical direction, a fuel cell system that generates power through an electrochemical reaction between a hydrogen-rich fuel gas and an oxidant gas such as air is known. In such an electrochemical reaction system, between adjacent unit cells and separators stacked in the stacking direction, there are interposed a seal portion for preventing gas leakage, and a conductive interconnector for electrically connecting the upper and lower anode and cathode. In such an electrochemical reaction system, in order to suppress deterioration of sealing performance and system performance (power generation performance) caused by reduced adhesion of such seal portions and interconnectors, a pressing means that applies a pressing force to the cell stack along the stacking direction is provided (see, for example, Patent Documents 1 and 2). For example, in the system described in Patent Document 1, a plurality of through bolts are provided as the pressing means. That is, the pressing force is applied to the cell stack by tightening a plurality of through bolts that penetrate the cell stack along the stacking direction. On the other hand, in the system described in Patent Document 2, a spring or a weight is provided as the pressing means. That is, the pressing force is applied to the cell stack by transmitting the repulsive force of the spring or the weight of the weight to the cell stack along the stacking direction. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-156352 [Patent Document 2] Japanese Patent Publication No. 2011-198546 [Overview of the project] [Problems that the invention aims to solve]

[0004] In conventional electrochemical reaction systems like those described above, the pressing mechanisms, consisting of through bolts, springs, and weights, tend to be relatively heavy and complex, which hinders the overall weight reduction and simplification of the system. In view of these circumstances, the main objective of the present invention is to provide a technology that, in an electrochemical reaction system equipped with a cell stack formed by alternately stacking single cells and separators along a predetermined stacking direction, can appropriately apply pressing force to the cell stack along the stacking direction, thereby suppressing deterioration of sealing performance and system performance caused by a decrease in the adhesion of seals and interconnects, while achieving overall system weight reduction and simplification. [Means for solving the problem]

[0005] A first characteristic configuration of the present invention is a cell stack formed by alternately stacking single cells, each consisting of an anode, a cathode, and an electrolyte layer interposed between them, and separators, each having an anode-side gas flow path defined on one side facing the anode and a cathode-side gas flow path defined on the other side facing the cathode, along a predetermined stacking direction. A gas processor that processes the gas supplied to and received by a gas manifold connected to at least one of the anode-side gas flow path and the cathode-side gas flow path of the cell stack, An electrochemical reaction system comprising pressing means for applying a pressing force to the cell stack along the stacking direction, The cell stack is installed with the stacking direction aligned with the vertical direction, The gas processor is installed above the cell stack. The pressing means is characterized in that a gas processor weight transmission unit, which transmits the weight of the gas processor to the cell stack as the pressing force, is interposed between the cell stack and the gas processor.

[0006] According to this configuration, in order to suppress deterioration of sealing performance and system performance caused by a decrease in the airtightness of the seal portion and interconnector, a gas processor weight transmission unit is provided as a pressing means that applies a pressing force to the cell stack along the stacking direction, thereby transmitting the weight of the gas processor to the cell stack as the aforementioned pressing force. This eliminates the need to provide through bolts, springs, weights, etc., which would hinder weight reduction and simplification. Accordingly, the present invention provides a technology that enables the application of appropriate pressing force to the cell stack along the stacking direction, while achieving overall weight reduction and simplification of the electrochemical reaction system equipped with a cell stack in which single cells and separators are alternately stacked along a predetermined stacking direction, thereby suppressing deterioration of sealing performance and system performance caused by a decrease in the adhesion of seals and interconnects.

[0007] A second characteristic configuration of the present invention is the provision of gas piping through which the gas exchanged between the gas processor and the gas manifold flows, The gas piping is fixed to the gas processor and the cell stack and functions as a weight transfer unit for the gas processor.

[0008] According to this configuration, by fixing the gas piping through which the gas exchanged between the gas processor and the gas manifold of the cell stack flows to the gas processor and the cell stack, the gas piping can be made to function as the weight transfer unit for the gas processor, thereby transferring the weight of the gas processor to the cell stack via the gas piping.

[0009] A third characteristic configuration of the present invention is that, in the cell stack, the gas manifold is formed on the extension portion of the separator that extends outward from the single cell, and a sealing portion for sealing the gas manifold is interposed between adjacent extension portions of the separator in the stacking direction. The gas piping is connected to the extension of the separator in the cell stack, and transmits the weight of the gas processor as the pressing force to the extension.

[0010] According to this configuration, when a gas manifold is formed on the extension of a separator that extends outward from a single cell in a cell stack, by connecting a gas pipe through which the gas exchanged between the gas processor and the gas manifold flows to the extension of the separator in the cell stack, the gas pipe can be made to function as a gas processor weight transmission unit that transmits the weight of the gas processor as the pressing force to the extension of the separator in the cell stack. Furthermore, the pressing force is transmitted to the extension side of the separator by the gas piping that functions as the weight transmission section of the gas processor, and the seal portion that seals the gas manifold formed on the extension portion of the separator can be made to adhere to the separator in a rational and appropriate manner, thereby further suppressing deterioration of sealing performance caused by a decrease in the adhesion of the seal portion.

[0011] A fourth feature configuration of the present invention is the provision of a gas processor support column that supports the gas processor, The gas processor support column is fixed to the gas processor and the cell stack and functions as a weight transfer unit for the gas processor.

[0012] According to this configuration, by fixing the gas processor support column that supports the gas processor to the gas processor and the cell stack, the gas processor support column can function as the weight transmission part for the gas processor, and the weight of the gas processor can be transmitted to the cell stack via the gas processor support column.

[0013] According to a fifth characteristic configuration of the present invention, in the cell stack, a conductive interconnector is interposed between adjacent single cells in the stacking direction, the gas processor support column is connected to the single cell side of the cell stack, and is configured to transmit the weight of the gas processor to the single cell side as the pressing force.

[0014] According to the present configuration, when an interconnector is interposed between adjacent single cells in the stacking direction in a cell stack, by connecting the gas processor support column that supports the gas processor to the single cell side of the cell stack, the gas processor support column can function as the gas processor weight transmitting portion that transmits the weight of the gas processor to the single cell side as the pressing force. Then, the pressing force is transmitted to the single cell side of the cell stack by the gas processor support column functioning as the gas processor weight transmitting portion, so that the interconnector can be reasonably and appropriately brought into close contact with the single cells, thereby further suppressing deterioration of system performance caused by reduced adhesion of the interconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] [Figure 1] Partial vertical sectional view showing a schematic configuration of a fuel cell system [Figure 2] Plan sectional view of the fuel cell system in Fig. 1 MODE FOR CARRYING OUT THE INVENTION

[0016] An embodiment of an electrochemical reaction system according to the present invention will be described with reference to the drawings. The electrochemical reaction system shown in Fig. 1 and Fig. 2 is configured as a fuel cell system (hereinafter referred to as "the present system") 100 that generates power through an electrochemical reaction between hydrogen H2 or the like contained in hydrogen-rich fuel gas G1 and oxygen O2 or the like contained in oxidant gas A1 such as air. That is, the present system 100 includes a flat plate-shaped cell stack 10 formed by alternately laminating unit cells 1 serving as power generation units and separators 6 along the lamination direction Z between a pair of end plates 8. In FIG. 1, the range indicated by (A) represents the A-A cross-sectional view in FIG. 2, and the range indicated by (B) represents the B-B cross-sectional view in FIG. 2.

[0017] As shown in FIG. 1, the unit cell 1 is configured as a rectangular flat-plate fuel cell unit cell including an anode 2, which is also called a fuel electrode, a cathode 3, which is also called an air electrode, and an electrolyte layer 4 interposed therebetween. The separator 6 is configured as a rectangular flat plate-shaped member that defines an anode-side gas flow path 13 facing the anode 2 on one surface and defines a cathode-side gas flow path 23 facing the cathode 3 on the other surface. The separator 6 also functions as a conductive interconnector 7 interposed between adjacent unit cells 1 in the lamination direction Z in the cell stack 10. Known configurations can be applied to the shapes of the anode-side gas flow path 13 and the cathode-side gas flow path 23 defined on the one surface and the other surface of the separator 6. For example, on the one surface of the separator 6, a plurality of grooves each functioning as the anode-side gas flow path 13 facing the anode 2 are formed parallel to each other, and on the other surface of the separator 6, a plurality of grooves each functioning as the cathode-side gas flow path 23 facing the cathode 3 are formed parallel to each other. Furthermore, the extending direction of the anode-side gas flow path 13 (the flowing direction of the fuel gas G1 and the fuel off-gas G2 in the anode-side gas flow path 13) and the extending direction of the cathode-side gas flow path 23 (the flowing direction of the oxidant gas A1 and the oxidant off-gas A2 in the cathode-side gas flow path 23) are orthogonal to each other when viewed in the lamination direction Z.

[0018] The cell stack 10 is provided with a fuel gas manifold 11 and a fuel off-gas manifold 12 that lead to the anode gas passage 13, and an oxidizer gas manifold 21 and an oxidizer off-gas manifold 22 that lead to the cathode gas passage 23, as gas manifolds that lead to at least one of the anode gas passage 13 and cathode gas passage 23 of the cell stack 10. Specifically, the fuel gas G1 supplied to the fuel gas manifold 11 is distributed to the respective anode gas passages 13 facing each of the anodes 2 of the multiple single cells 1 stacked as described above, and the fuel gas G1 after passing through each of the anode gas passages 13 flows into the fuel off-gas manifold 12 as fuel off-gas G2 and merges with it. Furthermore, the oxidant gas A1 supplied to the oxidant gas manifold 21 is distributed and flows into the respective cathode-side gas flow paths 23 facing each of the multiple stacked single cells 1 as described above, and after passing through each of the cathode-side gas flow paths 23, the oxidant gas A1 flows into the oxidant off-gas manifold 22 as oxidant off-gas A2 and merges with it.

[0019] In the cell stack 10, the gas manifolds 11, 12, 21, and 22 are formed on the extended portions 6a of the separator 6 that extend outward from the single cell 1. That is, the gas manifolds 11, 12, 21, and 22 are formed as spaces that penetrate along the stacking direction Z through the extended portions 6a of the multiple separators 6 stacked along the stacking direction Z. Furthermore, a sealing portion 9 that seals the gas manifolds 11, 12, 21, and 22 is interposed between adjacent extensions 6a of the separator 6 in the stacking direction Z. That is, between adjacent extensions 6a of the separator 6 in the stacking direction Z, the area around the fuel gas manifold 11 and the fuel off-gas manifold 12 is sealed by the sealing portion 9, except for the passage leading to the anode-side gas flow path 13, and the area around the oxidizer gas manifold 21 and the oxidizer off-gas manifold 22 is sealed by the sealing portion 9, except for the passage leading to the cathode-side gas flow path 23. Furthermore, the seal portion 9 can be the same as the seal material used in the cell stack of a known fuel cell system. For example, a seal material made of ceramic or glass-based material that is less prone to deformation or melting even at high temperatures can be used.

[0020] The system 100 is provided with a gas processor 60 that processes the gas supplied to and received by gas manifolds 11, 12, 21, and 22 that are connected to at least one of the anode-side gas flow path 13 and the cathode-side gas flow path 23 of the cell stack 10. The gas processor 60 is configured as a module in the fuel cell system 100 that includes various processors that perform predetermined processing on the fuel gas G1 and fuel off-gas G2 exchanged with the cell stack 10, and various processors that perform predetermined processing on the oxidizer gas A1 and oxidizer off-gas A2 exchanged with the cell stack 10. Specifically, although a detailed explanation will be omitted as it is publicly known, the modules constituting the gas processor 60 include a reformer that generates hydrogen-rich fuel gas G1 through a steam reforming reaction of the raw fuel, a vaporizer that heats water to generate the steam necessary for the steam reforming reaction in the reformer, a combustor that burns fuel off-gas G2 together with oxidizer off-gas A2 to generate the heat necessary for the reformer and vaporizer, and a preheater that preheats the oxidizer gas A1, which is air, through heat exchange with the exhaust gas of the combustor.

[0021] As shown in Figures 1 and 2, the system 100 is provided with gas piping through which gas exchanged between the gas processor 60 and gas manifolds 11, 12, 21, and 22 flows. This includes a fuel gas pipe 31 through which fuel gas G1 supplied from the gas processor 60 to the fuel gas manifold 11 flows, an oxidant gas pipe 41 through which oxidant gas A1 supplied from the gas processor 60 to the oxidant gas manifold 21 flows, a fuel off-gas pipe 32 through which fuel off-gas G2 supplied from the fuel off-gas manifold 12 to the gas processor 60 flows, and an oxidant off-gas pipe 42 through which oxidant off-gas A2 supplied from the oxidant off-gas manifold 22 to the gas processor 60 flows.

[0022] Specifically, fuel gas G1 is supplied from the gas processor 60 to the fuel gas manifold 11 of the cell stack 10 via fuel gas piping 31, and fuel off-gas G2 is supplied from the fuel off-gas manifold 12 of the cell stack 10 to the gas processor 60 via fuel off-gas piping 32. In addition, oxidant gas A1 is supplied from the gas processor 60 to the oxidant gas manifold 21 of the cell stack 10 via oxidant gas piping 41, and oxidant off-gas A2 is supplied from the oxidant off-gas manifold 22 of the cell stack 10 to the gas processor 60 via oxidant off-gas piping 42.

[0023] As described above, the extending direction of the anode-side gas flow path 13 and the extending direction of the cathode-side gas flow path 23 in the cell stack 10 are orthogonal to each other in the stacking direction Z view. Therefore, the fuel gas pipe 31 connected to the fuel gas manifold 11 located on the inlet side of the anode-side gas flow path 13 and the fuel off-gas pipe 32 connected to the fuel off-gas manifold 12 located on the outlet side of the anode-side gas flow path 13 are located in a pair of diagonal corners of the cell stack 10 in the stacking direction Z view as shown in Figure 2. On the other hand, the oxidizer gas pipe 41 connected to the oxidizer gas manifold 21 located on the inlet side of the cathode-side gas flow path 23 and the oxidizer off-gas pipe 42 connected to the oxidizer off-gas manifold 22 located on the outlet side of the cathode-side gas flow path 23 are located in a pair of diagonal corners of the cell stack 10 in the stacking direction Z view as shown in Figure 2, which are on a different diagonal than the diagonal where the fuel gas pipe 31 and fuel off-gas pipe 32 are located.

[0024] As shown in Figure 1, in the system 100 configured as described above, a pressing means X is provided to apply pressing forces F1 and F2 to the cell stack 10 along the stacking direction Z in order to suppress deterioration of sealing performance and system performance (power generation performance) caused by a decrease in the adhesion of the seal portion 9 and interconnector 7. The pressing means X of the system 100 is configured to appropriately apply pressing forces F1 and F2 to the cell stack 10 along the stacking direction Z while achieving overall system weight reduction and simplification, and its detailed configuration is described below.

[0025] In this system 100, the cell stack 10 is installed with the stacking direction Z aligned with the vertical direction, and the gas processor 60 is installed above the cell stack 10. Furthermore, as a pressing means X, gas processor weight transmission units X1 and X2 are interposed between the cell stack 10 and the gas processor 60, which transmit the weight of the gas processor 60 to the cell stack 10 as pressing forces F1 and F2. This configuration eliminates the need for through bolts, springs, weights, etc., which would hinder weight reduction and simplification.

[0026] Furthermore, the system 100 is provided with a first gas processor weight transmission unit X1 and a second gas processor weight transmission unit X2, which function as the pressing means X, although these will be described in detail later. Details of these first gas processor weight transmission unit X1 and second gas processor weight transmission unit X2 will be explained below.

[0027] The aforementioned gas pipes 31, 32, 41, and 42 are fixed to the gas processor 60 and the cell stack 10, and function as the first gas processor weight transfer unit X1. Specifically, the gas pipes 31, 32, 41, and 42 are connected to the extension portion 6a side of the separator 6 on the upper end plate 8 of the cell stack 10, functioning as the first gas processor weight transmission section X1, and transmitting the weight of the gas processor 60 as a pressing force F1 to the extension portion 6a side. Furthermore, since the gas pipes 31, 32, 41, and 42, which function as the first gas processor weight transmission section X1, are connected to the extension portion 6a side of the separator 6 in the cell stack 10, the first gas processor weight transmission section X1 transmits the weight of the gas processor 60 as the pressing force F1 to the extension portion 6a side of the separator 6 in the cell stack 10. As the pressing force F1 is transmitted to the extension portion 6a side of the separator 6 by the first gas processor weight transmission section X1, which functions with the gas pipes 31, 32, 41, and 42, the seal portion 9 that seals the gas manifolds 11, 12, 21, and 22 formed on the extension portion 6a of the separator 6 can be made to adhere to the separator 6 in a reasonable and appropriate manner. Therefore, deterioration of sealing performance due to a decrease in the adhesion of the seal portion 9 can be further suppressed.

[0028] In this system 100, a gas processor support column 50 that supports the gas processor 60 is provided approximately in the center of the cell stack 10. This gas processor support column 50 is fixed to the gas processor 60 and the cell stack 10 and functions as a second gas processor weight transfer unit X2. Specifically, the gas processor support column 50 is connected to the single cell 1 side of the upper end plate 8 of the cell stack 10, and functions as a second gas processor weight transmission unit X2, transmitting the weight of the gas processor 60 as a pressing force F2 to the single cell 1 side. Furthermore, the gas processor support column 50, which functions as the second gas processor weight transmission unit X2, is connected to the approximate center of the cell stack 10 where the single cell 1 is located in the stacking direction Z view. Therefore, the second gas processor weight transmission unit X2 transmits the weight of the gas processor 60 as a pressing force F2 to the single cell 1 side in the cell stack 10. Since the pressing force F2 is transmitted to the single cell 1 side in the cell stack 10 by the second gas processor weight transmission unit X2, which functions as the gas processor support column 50, the interconnector 7 can be made to adhere to the single cell 1 in a rational and appropriate manner. Thus, deterioration of system performance caused by a decrease in the adhesion of the interconnector 7 can be further suppressed.

[0029] [Another embodiment] Other embodiments of the present invention will now be described. Note that the configurations of each embodiment described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0030] (1) In the above embodiment, the pressing means X is provided as both a first gas processor weight transmission unit X1 in which the gas pipes 31, 32, 41, and 42 function, and a second gas processor weight transmission unit X2 in which the gas processor support column 50 function. However, it is also possible to configure the system to provide only one side of these first gas processor weight transmission unit X1 and second gas processor weight transmission unit X2. For example, by providing only the first gas processor weight transmission section X1 in which the gas pipes 31, 32, 41, and 42 function, and omitting the second gas processor weight transmission section X2 in which the gas processor support column 50 functions, the entire weight of the gas processor 60 can be transmitted as a pressing force F1 to the extension 6a side of the separator 6 in the cell stack 10. This allows the seal portion 9 that seals the gas manifolds 11, 12, 21, and 22 formed on the extension 6a of the separator 6 to adhere more closely to the separator 6, thereby more reliably suppressing deterioration of sealing performance caused by a decrease in the adhesion of the seal portion 9. On the other hand, by providing only the second gas processor weight transmission section X2 in which the gas processor support column 50 functions, and omitting the first gas processor weight transmission section X1 in which the gas piping 31, 32, 41, and 42 functions, the weight of the gas processor 60 can be transmitted to the single cell 1 side of the cell stack 10 as a pressing force F2, thereby allowing the interconnector 7 to adhere more closely to the single cell 1 and more reliably suppressing the deterioration of system performance caused by a decrease in the adhesion of the interconnector 7.

[0031] (2) In the above embodiment, all gas pipes 31, 32, 41, and 42 are configured to function as the first gas processor weight transfer section X1, and the weight of the gas processor 60 is transferred to the cell stack 10 via all gas pipes 31, 32, 41, and 42. However, it is also possible to configure only a portion of the gas pipes 31, 32, 41, and 42 to function as the first gas processor weight transfer section X1.

[0032] (3) In the above embodiment, the gas processor support column 50, which functions as the second gas processor weight transfer section X2, is provided at one location approximately in the center of the cell stack 10 where the single cell 1 is located in the stacking direction Z view. However, the installation location and number of gas processor support columns 50 can be changed as appropriate.

[0033] (4) In the above embodiment, an example was described in which the electrochemical reaction system according to the present invention is applied to a fuel cell system 100 that generates electricity by an electrochemical reaction between hydrogen and oxygen. However, the electrochemical reaction system according to the present invention may be any cell stack comprising a cell stack formed by alternately stacking single cells and separators along a predetermined stacking direction, and a gas processor that processes the gas supplied to and received by a gas manifold that is connected to at least one of the anode-side gas flow path and the cathode-side gas flow path in the cell stack. For example, the electrochemical reaction system according to the present invention can also be applied to systems other than the above fuel cell system, such as an electrolytic reaction system that generates fuel (methane) by an electrochemical reaction (electrolytic reaction) between water and carbon dioxide. [Explanation of Symbols]

[0034] 1 single cell 2 Anodes 3 Cathode 4 Electrolyte layer 6 Separators 6a Extension 7 Interconnectors 9. Seal part 10-cell stack 11. Fuel gas manifold (gas manifold) 12. Fuel-off gas manifold (gas manifold) 13 Anode-side gas flow path 21. Oxidizer gas manifold (gas manifold) 21 Gas Manifold 22. Oxidizer-free gas manifold (gas manifold) 23 Cathode-side gas flow path 31. Fuel gas piping (gas piping) 32 Fuel Off-Gas Piping (Gas Piping) 41. Oxidizing agent gas piping (gas piping) 42. Oxidizer off-gas piping (gas piping) 50 Gas treatment equipment support column 60 Gas processors 100 Fuel cell systems (electrochemical reaction systems) A1 Oxidizing gas (gas) A2 Oxidizing agent off-gas (gas) G1 Fuel Gas (Gas) G2 Fuel Off-Gas (Gas) F1 Pressing force F2 Pressure force X Pressing means X1 First gas processor weight transmission unit (gas processor weight transmission unit) X2 Second gas processor weight transfer section (gas processor weight transfer section) Z stacking direction

Claims

1. A cell stack is formed by alternately stacking single cells, each consisting of an anode, a cathode, and an electrolyte layer interposed between them, and separators, each having an anode-side gas flow path defined on one side facing the anode and a cathode-side gas flow path defined on the other side facing the cathode, along a predetermined stacking direction. A gas processor that processes the gas supplied to and received by a gas manifold connected to at least one of the anode-side gas flow path and the cathode-side gas flow path of the cell stack, An electrochemical reaction system comprising pressing means for applying a pressing force to the cell stack along the stacking direction, The cell stack is installed with the stacking direction aligned with the vertical direction, The gas processor is installed above the cell stack. An electrochemical reaction system in which a gas processor weight transmission unit, which transmits the weight of the gas processor to the cell stack as the pressing force, is interposed between the cell stack and the gas processor as the pressing means.

2. The gas processor and the gas manifold are equipped with gas piping through which the gas exchanged between them flows, The electrochemical reaction system according to claim 1, wherein the gas piping is fixed to the gas processor and the cell stack and functions as a weight transfer unit for the gas processor.

3. In the cell stack, the gas manifold is formed on the extension of the separator that extends outward from the single cell, and a sealing portion for sealing the gas manifold is interposed between adjacent extensions of the separator in the stacking direction. The electrochemical reaction system according to claim 2, wherein the gas piping is connected to the extension portion of the separator in the cell stack, and the weight of the gas processor is transmitted to the extension portion as the pressing force.

4. The gas processor is provided with a gas processor support column that supports the aforementioned gas processor, The electrochemical reaction system according to claim 1, wherein the gas processor support column is fixed to the gas processor and the cell stack and functions as a weight transfer unit for the gas processor.

5. In the cell stack, a conductive interconnector is interposed between adjacent single cells in the stacking direction. The electrochemical reaction system according to claim 4, wherein the gas processor support column is connected to the single cell side in the cell stack and transmits the weight of the gas processor as the pressing force to the single cell side.

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