JP5378032B2 - Solid oxide fuel cell device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-oxide fuel cell device suppressing unevenness of power generation outputs in the length direction of a stack and advantageous in enhancing the power generation output of the stack. <P>SOLUTION: The solid-oxide fuel cell device includes an exhaust gas passage 7 through which exhaust gas subjected to power generation reaction of a stack 2 which is formed by assembling fuel cells 20 in the length direction is exhausted. The exhaust gas passage 7 includes a dividing chamber group 79 formed with a plurality of dividing chambers 7f, 7s, 7t formed by dividing the stack 2 in the length direction; and a resistance member 100. The resistance member 100 increasing pressure drop in the exhaust gas than that in other dividing chambers is arranged in a high temperature-side dividing chamber where temperature in a state that the resistance member 100 is not arranged is relatively higher than that of other dividing chambers out of the dividing chamber group 79. The resistance member 100 increases evenness of the temperature of the exhaust gas in the length direction of the stack 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a solid oxide fuel cell device that discharges high-temperature exhaust gas.

  The solid oxide fuel cell device includes a stack in which a plurality of fuel cells (SOFC) are assembled, and an exhaust gas passage through which exhaust gas that has undergone a power generation reaction of the stack flows out (Patent Documents 1, 2, and 3). According to this, the anode gas is supplied to the anode of the stack, and the cathode gas is supplied to the cathode of the stack to generate power.

  According to Patent Document 1, a catalytic combustion layer for burning exhaust gas discharged from a fuel cell with exhaust air is provided. According to Patent Document 2, a plurality of gas supply paths are arranged around the stack in order to reduce temperature unevenness in the cross-sectional direction of the stack. Further, according to Patent Document 3, exhaust heat from the stack is used by catalytic combustion for burning exhaust gas discharged from the stack and heating the heat exchanger with heat of catalytic combustion.

JP 2003-229151 A JP 2005-158525 A JP 2005-327553 A

  The industry demands that the power generation efficiency and durability of the stack be further improved in the above-described solid oxide fuel cell device. However, there is a possibility that unevenness in power generation output due to uneven temperature around the stack may occur, and there is a limit to improving power generation efficiency and durability. In particular, when the stack is extended in the longitudinal direction, there is a possibility that unevenness in power generation output may occur in the longitudinal direction of the stack, and there is a limit to improving the power generation efficiency and durability of the stack.

  The present invention has been made in view of the above-described circumstances, and is a solid oxide fuel cell device that is advantageous in suppressing unevenness of the power generation output of the stack in the longitudinal direction of the stack and improving the power generation efficiency and durability of the stack. It is an issue to provide.

  A solid oxide fuel cell device according to the present invention includes (i) a stack in which a plurality of fuel cells are stacked and extended in a longitudinal direction, and an inlet through which exhaust gas that has undergone a power generation reaction of the fuel cells in the stack flows. An exhaust gas passage having an outlet for discharging exhaust gas and extending along the longitudinal direction of the stack, and (ii) a plurality of exhaust gas passages divided in the longitudinal direction of the stack A divided chamber group formed by the divided chambers and a resistance member disposed in the exhaust gas passage, and (iii) among the divided chamber groups, the temperature is divided into other divided states in the state where the resistive member is not disposed. In at least the high temperature side divided chamber that is relatively higher in temperature than the chamber temperature, a resistance member is arranged so that the pressure loss in the high temperature side divided chamber is higher than the pressure loss in the other divided chambers.

  According to the present invention, the exhaust gas passage includes a divided chamber group formed by a plurality of divided chambers divided in the longitudinal direction of the stack, and a resistance member that is disposed in the exhaust gas passage and is resistant to the flow of the exhaust gas. And. Among the divided chamber groups, the pressure loss in the high-temperature-side divided chamber is reduced to at least the high-temperature-side divided chamber at least in the high-temperature-side divided chamber where the temperature is relatively higher than the temperature of the other divided chamber in a state where the resistance member is not disposed The resistance member is arranged so as to be higher than the pressure loss at.

  According to the present invention, the resistance chamber that is resistant to the flow of the exhaust gas and increases the pressure loss is arranged in the relatively high temperature division chamber. For this reason, the flow rate of the exhaust gas per unit time and unit volume flowing into the division chamber (the high temperature side division chamber) that is relatively high in the state where the resistance member is not disposed is compared with the case where the resistance member is not disposed. Then decrease. As a result, the high-temperature exhaust gas is less likely to flow toward the high-temperature side division chamber having a high pressure loss. The high temperature exhaust gas is likely to flow toward the low temperature side division chamber having a low pressure loss.

  For this reason, when the high-temperature exhaust gas flows through the exhaust gas passage of the low-temperature side division chamber, the temperature of the exhaust gas passage can be made uniform in the longitudinal direction of the stack. As a result, the temperature difference between the exhaust gas flow path and the stack is reduced, so that heat loss in the stack can also be suppressed. In the present invention as described above, unevenness in the power generation output of the stack in the longitudinal direction of the stack can be suppressed, and the power generation efficiency and durability of the stack can be improved. Further, since the temperature of the exhaust gas passage can be made uniform in the longitudinal direction of the stack, the heat exchange efficiency between the exhaust gas and the cathode gas is made uniform in the longitudinal direction of the stack. Accordingly, a relatively high temperature cathode gas can be supplied to a portion having a relatively low temperature in the longitudinal direction of the stack. Also in this sense, the temperature uniformity in the longitudinal direction of the stack can be improved.

  According to the solid oxide fuel cell device of the present invention, a high amount of high-temperature exhaust gas can be allowed to flow into the low-temperature side division chamber of the exhaust gas passage, so that the uniformity of the temperature distribution of the exhaust gas in the longitudinal direction is improved. be able to. As a result, since the temperature difference between the exhaust gas flow path and the stack in the longitudinal direction becomes small, heat loss in the stack can also be suppressed. Moreover, since the temperature of the exhaust gas passage can be made uniform in the longitudinal direction of the stack, the heat exchange efficiency between the exhaust gas and the cathode gas is made uniform in the longitudinal direction. Accordingly, a relatively high temperature cathode gas can be supplied to a portion having a relatively low temperature in the longitudinal direction of the stack. As a result, the temperature uniformity in the longitudinal direction of the stack can be improved. Therefore, the uniformity of the power generation output (power generation voltage) in the longitudinal direction of the stack can be increased, and the power generation efficiency and durability of the stack can be increased.

1 is a perspective view of a main part of a fuel cell device according to Embodiment 1. FIG. 1 is a conceptual diagram schematically showing a concept of a fuel cell device according to Embodiment 1. FIG. FIG. 6 is a perspective view of a main part of a fuel cell device according to Embodiment 2. FIG. 6 is a perspective view of a main part of a fuel cell device according to Embodiment 3. FIG. 6 is a perspective view of a main part of a fuel cell device according to a fourth embodiment. FIG. 9 is a cross-sectional view taken along a horizontal direction of an exhaust gas passage of a fuel cell device according to a fifth embodiment. FIG. 10 is a cross-sectional view taken along a horizontal direction of an exhaust gas passage of a fuel cell device according to a sixth embodiment. FIG. 10 is a cross-sectional view taken along a horizontal direction of an exhaust gas passage of a fuel cell device according to Embodiment 7. FIG. 10 is a cross-sectional view taken along a horizontal direction of an exhaust gas passage of a fuel cell device according to an eighth embodiment.

  The resistance member is a member that resists the flow of the exhaust gas, and generates a pressure loss of the exhaust gas in the exhaust gas passage. The resistance member may be anything as long as it resists the flow of exhaust gas, and examples thereof include a catalyst carrier having a purification catalyst (combustion catalyst) for purifying exhaust gas. Examples of the purification catalyst are those that reduce environmental impact components such as CO, HC, NOx, and HC, and examples include an oxidation catalyst, a reduction catalyst, and a three-way catalyst. Furthermore, the resistance member may be a member such as ceramic or metal that does not carry a catalyst. The shape of such a member is not particularly limited, and examples thereof include a spherical shape, a granular shape, a flake shape, a fibrous shape, a monolith structure, a corrugated plate, and a net.

  According to a preferred embodiment, a catalyst carrier having a purification catalyst for purifying exhaust gas is accommodated as a resistance member in each of the divided chambers constituting the divided chamber group. In the divided chamber group, the catalyst carrier is arranged as a resistance member in at least the high temperature side divided chamber where the temperature is relatively higher than the temperatures of the other divided chambers in a state where the catalyst carrier is not accommodated. Preferably it is. In this case, since the pressure loss in the high temperature side division chamber is higher than the pressure loss in the other division chambers, the high temperature exhaust gas is less likely to flow into the high temperature side division chamber and is likely to flow into the low temperature side division chamber. As a result, the uniformity of temperature in the longitudinal direction of the stack can be improved as a whole.

  According to a preferred embodiment, the cathode gas passage through which the cathode gas before power generation reaction supplied to the stack flows is provided. The cathode gas passage and the exhaust gas passage are provided so that heat exchange is possible between the cathode gas flowing through the cathode gas passage and the exhaust gas flowing through the exhaust gas passage.

  If the temperature of the exhaust gas is excessively high, the efficiency with which the purification catalyst purifies the exhaust gas may decrease, or the catalyst may deteriorate. Therefore, according to a preferred embodiment, in the exhaust gas passage, a cooling element that lowers the temperature of the exhaust gas by promoting heat exchange is provided upstream of the catalyst carrier. In this case, contact of the high-temperature exhaust gas with the catalyst carrier is suppressed, and thermal deterioration of the catalyst supported on the catalyst carrier is suppressed. Examples of the cooling element include good heat conducting members (granular, net-like, etc.) excellent in heat conduction.

  Preferably, the resistance member is disposed upstream of the first resistance member in the exhaust gas passage and is formed of a catalyst carrier having a purification catalyst that purifies the exhaust gas, and lowers the temperature of the exhaust gas. A second resistance member. Before the exhaust gas contacts the catalyst carrier, the exhaust gas contacts the second resistance member and is cooled. For this reason, an excessive increase in the temperature of the exhaust gas in contact with the catalyst carrier is suppressed. For this reason, the purification efficiency by which the catalyst of the catalyst carrier purifies the exhaust gas can be increased. In this sense, it is preferable that the second resistance member does not have a purification catalyst that purifies the exhaust gas. Alternatively, even if the second resistance member has the purification catalyst, it is preferable that the amount of the purification catalyst supported per unit volume is smaller than the amount of the purification catalyst supported on the first resistance member.

  A large amount of gas flows through the exhaust gas passage having the lower pressure loss. For this reason, when a catalyst carrier is used as the resistance member, the exhaust gas passage with the lower pressure loss causes more catalyst reaction (exothermic reaction) and the temperature becomes higher. For this reason, the temperature raising property of the temperature of the exhaust gas passage having the lower pressure loss is ensured as compared with the case where there is no catalyst.

  According to a preferred embodiment, it is preferable that a cathode gas passage through which the cathode gas before being supplied to the stack flows is provided so as to face the exhaust gas passage in which the catalyst carrier carrying the purification catalyst is accommodated. In this case, the cathode gas can be preheated with the heat of the catalyst carrier and the catalyst carrier can be cooled with the cathode gas. Therefore, thermal deterioration of the catalyst and / or catalyst support is suppressed.

  According to a preferred embodiment, the resistance member is arranged in an intermediate region in the direction in which the exhaust gas flows in the exhaust gas passage. In this case, it is possible to contribute to reducing temperature variations in the direction in which the exhaust gas flows in the exhaust gas passage.

(Embodiment 1)
1 and 2 show the first embodiment. This embodiment shows an example applied to a solid oxide fuel cell device 1. FIG. 1 shows a concept of a fuel cell device 1 according to the first embodiment. The fuel cell device 1 includes a stack 2 in which a plurality of fuel cells 20 are stacked in the thickness direction and extended along the longitudinal direction (the direction of the arrow L). As shown in FIG. 1, the fuel cell device 1 includes a substrate 3 having an arrangement chamber 30, a stack 2 formed of a fuel cell 20 accommodated in the arrangement chamber 30 of the substrate 3, and an arrangement chamber 30 of the substrate 3. The reformer 4 is disposed on the upper side of the stack 2, the combustion space 5 is formed between the upper end of the stack 2 and the lower end of the reformer 4, and the heat insulating material is disposed on the outer side of the stack 2. The heat insulating layer 6 is disposed, the exhaust gas passage 7 disposed outside the heat insulating layer 6, and the cathode gas passage 8 disposed adjacent to the exhaust gas passage 7 so as to be able to exchange heat with each other.

  As shown in FIG. 1, the exhaust gas passage 7 is formed of passage forming members 7a and 7c whose base material is metal. The exhaust gas passage 7 has an inlet 7i formed on the upper end side of the exhaust gas passage 7 so as to be closer to the reformer 4 and the combustion space 5, and an outlet 7p formed on the lower end side of the exhaust gas passage 7. And have. The exhaust gas passage 7 is basically formed along the vertical direction, and extends along the longitudinal direction of the stack 2 (arrow L direction, fuel cell stacking direction). The cathode gas passage 8 is formed by plate-like passage forming members 8a and 7c.

  As shown in FIG. 1, the cathode gas passage 8 is adjacent to the exhaust gas passage 7, and includes an inlet 80, a first passage 81 that extends upward in the vertical direction from the inlet 80, and a horizontal passage from the upper end of the first passage 81. The second passage 82 extends in the direction, the third passage 83 extends downward from the tip of the second passage 82, and the outlet 84 formed on the lower end side of the third passage 83. Two sets of stacks 2 formed by stacking the fuel cells 20 in the thickness direction are provided so as to sandwich the third passage 83.

An anode gas manifold 24 that guides the anode gas to the inlet of the fuel cell 20 is disposed at the lower portion of the stack 2. As shown in FIG. 1, the stack 2, the cathode gas passage 8, the exhaust gas passage 7, the reformer 4, the anode gas manifold 24, and the combustion space 5, which will be described later, are arranged in the longitudinal direction of the fuel cell device 1 ( It extends along the direction of arrow L, the stacking direction of the fuel cells 20. The arrow L direction is the stacking direction in which the fuel cells 20 are stacked to form the stack 2. In FIG. 1, the cathode gas (air) includes the arrow C1 direction, the arrow C2 direction, the arrow C3 direction, the arrow C4 direction, The gas flows through the first passage 81, the second passage 82, and the third passage 83 along the arrow C5 direction, and is supplied from the outlet 84 at the tip of the cathode gas passage 8 to the lower inlet of the cathode 22 of the fuel cell 20. Further, the cathode gas supplied to the cathode 22 is used for a power generation reaction at the cathode 22 while passing upward through the cathode 22.

  The cathode gas after the power generation reaction is discharged from the upper part of the cathode of the fuel cell 20 to the combustion space 5 as a cathode off gas. On the other hand, the anode gas is used for power generation reaction of the anode 21 while passing upward from the anode gas manifold 24 through the inside of the fuel cell 20. The anode gas after the power generation reaction is discharged from the upper part of the fuel cell 20 to the combustion space 5 as an anode off gas. The anode off gas leaves unreacted combustible components (hydrogen) and can be reburned. The cathode off gas leaves unreacted oxygen.

FIG. 2 shows an example of a conceptual diagram near the fuel cell 20 and the reformer 4. As illustrated in FIG. 2, the fuel cell 20 configuring the stack 2 includes a gas-permeable porous conductive portion 21 w having a passage 21 r to which anode gas is supplied, an anode 21 that functions as a fuel electrode, It has a cathode 22 that functions as an oxidant electrode to which a cathode gas is supplied, a membrane-like electrolyte 25 based on a solid oxide sandwiched between the anode 21 and the cathode 22, and a connector portion 20x. The solid oxide has a property of conducting oxygen ions (O ²⁻ ) at the operating temperature of the stack 2, and examples thereof include zirconia and lanthanum gallates such as YSZ. The anode 21 is exemplified by nickel-ceria cermet. Examples of the cathode 22 include samarium cobaltite and lanthanum manganite. The material is not limited to the above.

  As described above, the anode off gas is discharged from the upper part of the fuel cell 20 into the combustion space 5. In the combustion space 5, the anode off gas is burned by the cathode off gas that has undergone the power generation reaction or the cathode gas that has not undergone the power generation reaction to form the combustion flame 50, and the reforming unit 42 and the evaporation unit 40 are heated. As a result, the reforming reaction in the reforming unit 42 is maintained, and the steam generation reaction is maintained in the evaporation unit 40.

  According to the present embodiment, the flow rate of the anode gas supplied to the anode 21 of the stack 2 (the fuel raw material supplied to the reforming unit 42) is the flow rate used in the power generation reaction at the anode 21 of the fuel cell 20. In the combustion space 5, a flow rate obtained by adding the flow rate at which the anode off-gas forms the combustion flame 50 is set. As the flow rate of the cathode gas, the flow rate used in the power generation reaction at the cathode 22 of the fuel cell 20, the flow rate at which the cathode off gas forms the combustion flame 50 as combustion air in the combustion space 5, and the surplus flow rate are added. The flow rate is set.

  As shown in FIG. 2, the reformer 4 includes an evaporation unit 40 and a reforming unit 42 to which a fuel material is supplied. The evaporator 40 vaporizes the liquid phase reformed water supplied from the reformed water system to the evaporator 40. The reforming unit 42 is provided downstream of the evaporation unit 40 and steam-reforms the hydrocarbon-based fuel material with the steam generated by the evaporation unit 40 to generate anode gas. The anode gas is hydrogen gas or hydrogen-containing gas. According to the solid oxide fuel cell 20, the operating temperature of the fuel cell 20 in the rated operation of the stack 2 is preferably in the range of 500 to 1100 ° C, in particular in the range of 550 to 800 ° C. .

Now, a description will be given of when the fuel cell 20 is in a power generation operation. In this case, since the fuel material pump 90 is driven, a hydrocarbon-based fuel material is supplied to the evaporation unit 40 of the reformer 4 through the fuel material supply passage 92. Further, the reforming water pump 93 is driven, and the reforming water in a water storage tank (not shown) is supplied to the evaporator 40 through the reforming water passage 94. Here, since the evaporation part 40 is heated by the combustion flame 50, the evaporation part 40 makes the liquid phase reformed water vapor. The generated water vapor is supplied to the reforming unit 42. The reforming unit 42 steam-reforms the fuel material to generate an anode gas containing hydrogen. When the fuel raw material is methane-based, it is considered that the generation of the anode gas in the steam reforming is based on the following equation (1). In the solid oxide fuel cell 20, CO can be used as fuel in addition to H ₂ .

(1) ... CH ₄ + 2H ₂ O → 4H ₂ + CO ₂
CH ₄ + H ₂ O → 3H ₂ + CO
When CnHm is a general chemical formula for hydrocarbons, the general formula for steam reforming is the following formula (1-1). When n = 1 and m = 4, an equation for steam reforming of methane is obtained.

(1-1) ... CnHm + 2nH ₂ O → nCO ₂ + [(m / 2) + 2n)] H ₂
The produced hydrogen gas containing hydrogen is supplied to the anode 21 via the anode gas manifold 24 and the passage 21r of the fuel cell 20 and used for power generation. Since the cathode gas pump 95 is driven, the cathode gas, which is air, flows along the first passage 81, the second passage along the arrow C1, arrow C2, arrow C3, arrow C4, and arrow C5 directions in FIG. The gas flows through the passage 82 and the third passage 83 and is supplied from the outlet 84 at the tip of the cathode gas passage 8 toward the fuel cell 20. Further, the cathode gas is supplied to the cathode 22 and flows upward in the passage 32 r of the fuel cell 20 and is used for the power generation reaction of the cathode 22.

On the other hand, the anode gas is used for the power generation reaction of the anode 21 while passing upward from the anode gas manifold 24 to the anode 21 of the fuel cell 20. As a result, the fuel cell 20 generates power. In the power generation reaction, it is considered that the reaction (2) basically occurs at the anode 21 supplied with the hydrogen-containing gas. It is considered that the reaction (3) basically occurs at the cathode 22 to which oxygen is supplied. Oxygen ions (O ²⁻ ) generated at the cathode 22 conduct the electrolyte (oxygen ion conductor, ion conductor) from the cathode 22 toward the anode 21.

(2) ... H ₂ + O ²⁻ → H ₂ O + 2e ⁻
When CO is contained, CO + O ²⁻ → CO ₂ + 2e ⁻
(3)... 1 / 2O ₂ + 2e ⁻ → O ²⁻
The anode off gas after the power generation reaction is discharged from the upper part of the anode 21 of the fuel cell 20 to the combustion space 5. The anode off gas is burned by the cathode off gas or the cathode gas, and a combustion flame 50 is formed in the combustion space 5. According to the reaction formula (2), the anode off gas may contain moisture (H ₂ O).

  The gas such as the anode off-gas after burning in the combustion space 5 becomes a high-temperature exhaust gas. The exhaust gas enters the exhaust gas passage 7 from the inlet 7i, flows downward through the exhaust gas passage 7, and is discharged from the outlet 7p. Here, heat exchange is performed between the high-temperature exhaust gas flowing downward in the exhaust gas passage 7 and the low-temperature cathode gas flowing upward in the cathode gas passage 8 (opposite to the flow direction of the exhaust gas). Thus, the exhaust gas is cooled. Further, the cathode gas before being supplied to the stack 2 is preheated. Since the preheated cathode gas is supplied to the cathode 22 of the fuel cell 20 through the second passage 82, the third passage 83, and the outlet 84 of the cathode gas passage 8, the power generation efficiency is improved.

  Here, the hot exhaust gas flowing through the exhaust gas passage 7 flows downward, and the low-temperature cathode gas flowing through the cathode gas passage 8 flows upward. As a result, the hot exhaust gas and the cold cathode gas exchange heat with each other as a counter flow. Therefore, the exhaust gas discharged from the combustion space 5 is cooled, and the cathode gas before being supplied to the stack 2 is preheated to improve the power generation efficiency.

  Now, according to the present embodiment, as shown in FIG. 1, the fuel cell device 1 is arranged in the direction in which the fuel cells 20 constituting the stack 2 are stacked, that is, along the longitudinal direction of the stack 2 (arrow L direction). It is extended. A plurality of partition members 86 are arranged in the exhaust gas passage 7 in the longitudinal direction. Therefore, the exhaust gas passage 7 includes a plurality of first divided chambers 7f, second divided chambers 7s, and third divided chambers 7t that are partitioned in the longitudinal direction of the stack 2 by the partition member 86 (in the direction of arrow L). Let Thus, the first divided chamber 7f, the second divided chamber 7s, and the third divided chamber 7t have the divided chamber group 79. The passage thickness of the first division chamber 7f, the passage thickness of the second division chamber 7s, and the passage thickness of the third division chamber 7t are the same. An interval dimension X between adjacent partition members 86 can be appropriately set according to the fuel cell device 1.

  As can be understood from FIG. 1, in the exhaust gas passage 7, the inlet 7i thereof is common to the first divided chamber 7f, the second divided chamber 7s, and the third divided chamber 7t. Therefore, the exhaust gas that has passed through the inlet 7i is branched into the first divided chamber 7f, the second divided chamber 7s, and the third divided chamber 7t. The branched exhaust gas is discharged from the first divided chamber 7f, the second divided chamber 7s, and the third divided chamber 7t, and then merges.

  According to the present embodiment, as shown in FIG. 1, in each of the divided chambers 7f, 7s, and 7t, a ceramic granular catalyst carrier 100 having a purification catalyst that purifies exhaust gas is used as a resistance member (pressure loss member). Contained. The purification catalyst is a catalyst that purifies by oxidizing an environmental influence component (for example, oxygen monoxide) contained in the exhaust gas, and examples thereof include noble metal systems such as platinum, palladium, and gold. An example of the catalyst carrier 100 is alumina.

  As shown in FIG. 1, an exhaust gas passage 7 is provided outside the stack 2, and a granular catalyst carrier made of ceramics that purifies exhaust gas in the divided chambers 7 f, 7 s, 7 t constituting the exhaust gas passage 7. 100 are housed. Specifically, the catalyst carrier 100f is accommodated in the division chamber 7f. A catalyst carrier 100s is accommodated in the dividing chamber 7s. A catalyst carrier 100r is accommodated in the division chamber 7t. The catalyst carriers 100f, 100s, and 100t carry a catalyst that purifies exhaust gas, and can be of the same type and size, for example. As can be understood from FIG. 1, the catalyst carrier 100 that carries the purification catalyst indirectly faces the stack 2 side via a passage forming member 7 a that constitutes the exhaust gas passage 7. For this reason, the catalyst carrier 100 (100f, 100s, 100t) is easily transferred from the high-temperature stack 2. In this case, it is effective when the active temperature region of the purification catalyst is in a region where the temperature is relatively high.

  As shown in FIG. 1, it is not the upper side of the divided chambers 7f, 7s, 7t that constitute the exhaust gas passage 7 (upstream region in the divided chambers 7f, 7s, 7t) but the bottom side of the divided chambers 7f, 7s, 7t (divided). In the chambers 7f, 7s, and 7t), the catalyst carrier 100 (100f, 100s, and 100t) is accommodated as a resistance member. In FIG. 1, the size of the catalyst carrier 100 is schematically shown.

  Here, as shown in FIG. 1, in the divided chambers 7f, 7s, and 7t, the hollow spaces 7fp, 7sp, and 7tp are arranged above (upstream) from the catalyst carrier 100. The hollow spaces 7fp, 7sp, and 7tp can play a role of reducing the high-temperature exhaust gas before contacting the catalyst carrier 100 by heat exchange with the cathode gas. The relatively hot exhaust gas flowing through the hollow spaces 7fp, 7sp, and 7tp is cooled by heat exchange with the relatively cold cathode gas flowing through the cathode gas passage 8 via the passage forming member 7c.

  By the way, in the power generation operation such as the rated operation of the fuel cell device 1, generally, the intermediate region tends to be relatively high in temperature compared to the end region in the longitudinal direction (arrow L direction) of the stack 2. It is assumed that the end region in the longitudinal direction of the stack 1 is easily radiated. Here, as can be understood from FIG. 1, the first division chamber 7 f and the third division chamber 7 t correspond to end regions in the longitudinal direction (arrow L direction) of the stack 2. The second divided chamber 7s sandwiched between the first divided chamber 7f and the third divided chamber 7t corresponds to an intermediate region in the longitudinal direction (arrow L direction) of the stack 2.

  Under the condition that the catalyst carrier 100 (100f, 100s, 100t), which is the resistance member, is not accommodated, the second divided chamber 7s corresponding to the central region has the first divided chamber 7f and the third divided region corresponding to the end regions. It is likely to be relatively hotter than the dividing chamber 7t. That is, in the power generation operation such as the rated operation of the fuel cell device 1, the temperature of the second division chamber 7 s in the state where the catalyst carrier 100 is not accommodated is essentially the other division chamber (the first division chamber 7 f and This is a high temperature side division chamber that is relatively hotter than the temperature of the third division chamber 7t). In other words, in the state where the catalyst carrier 100 is not accommodated, the temperature of the first division chamber 7f and the third division chamber 7t is essentially the lower temperature side where the temperature is relatively lower than the temperature of the second division chamber 7s. It is a divided room.

  In this regard, according to the present embodiment, the second divided chamber 7s, which is likely to have a relatively high temperature, has a granular catalyst carrier 100 that resists the flow of exhaust gas and generates a pressure loss as a resistance member. It is accommodated more than the chamber 7f and the third divided chamber 7t. Thereby, the pressure loss in the exhaust gas passage 7 in the arrow L direction is adjusted.

  In other words, in the divided chamber group 79, the first divided chamber 7f and the first divided chamber 7f, which are low-temperature-side divided chambers in which the temperature is relatively lower than the temperature of the second divided chamber 7s when the catalyst carrier 100 is not accommodated. In the three-divided chamber 7t, a catalyst carrier 100 that is resistant to the flow of exhaust gas is accommodated in a smaller number than the second divided chamber 7s (high-temperature-side divided chamber). Accordingly, the pressure loss in the first divided chamber 7f and the third divided chamber 7t corresponding to the end region is lower than the pressure loss in the second divided chamber 7s corresponding to the central region.

  In other words, paying attention to the height direction of the exhaust gas passage 7 (the direction of the arrow H), the accommodation height of the catalyst carrier 100 accommodated in the first division chamber 7f is H1, and is accommodated in the second division chamber 7s. When the accommodation height of the catalyst carrier 100 is H2, and the accommodation height of the catalyst carrier 100 accommodated in the third divided chamber 7t is H3, the relationship of H2> H1. The relationship is H2> H3.

  Therefore, in the exhaust gas passage 7, compared to before adjusting the pressure loss, the exhaust gas is less likely to flow into the second divided chamber 7 s and more easily flows into the first divided chamber 7 f and the third divided chamber 7 t. Thus, the exhaust gas distribution in the exhaust gas passage 7 is adjusted. Therefore, the temperature of the second divided chamber 7s is adjusted to be relatively lower than before adjusting the pressure loss, and the temperature of the first divided chamber 7f and the third divided chamber 7t is adjusted to be relatively high. The Thereby, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. As a result, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) can be made uniform. For this reason, the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction (arrow L direction) can be improved, which is advantageous in improving the power generation efficiency of the stack 2.

  In particular, in the solid oxide fuel cell 20, the temperature greatly affects the power generation output (power generation voltage). Considering this, it is effective to improve the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction of the stack 2 (the direction of the arrow L).

  Further, as described above, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) can be made uniform, so that it is accommodated in each of the first divided chamber 7f, the second divided chamber 7s, and the third divided chamber 7t. The variation in the purification effect of the purification catalyst that is present can be reduced, and the exhaust gas purification performance can be enhanced. In addition, it is possible to reduce variations in the durability of the purification catalyst in each of the first division chamber 7f, the second division chamber 7s, and the third division chamber 7t.

  According to this embodiment, as can be understood from FIG. 1, the exhaust gas passage 7 and the cathode gas passage 8 face each other through the passage forming member 7c. For this reason, the cathode gas passage 8 through which the cathode gas before being supplied to the stack 2 flows is provided so as to face the catalyst carrier 100 carrying the purification catalyst accommodated in the exhaust gas passage 7. In this case, it is possible to preheat a relatively low temperature cathode gas, which is the outside air, with the heat of the catalyst carrier 100 and to cool the catalyst carrier 100 with the cathode gas in the cathode gas passage 8. Therefore, thermal deterioration of the catalyst and / or the catalyst carrier 100 can be suppressed, and the durability of the catalyst can be improved.

  According to the present embodiment, as described above, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. For this reason, in exchanging heat between the exhaust gas flowing through the exhaust gas passage 7 and the cathode gas flowing through the cathode gas passage 8, the uniformity of heat exchange can be improved in the longitudinal direction (arrow L direction). For this reason, it can also contribute to the uniformity of the temperature of the cathode gas supplied to the stack 2, and can contribute to the reduction of power generation unevenness in the longitudinal direction (arrow L direction) of the stack 2. Therefore, it is possible to suppress unevenness in the power generation output in the longitudinal direction of the stack 2 and contribute to improving the power generation efficiency and durability of the stack 2.

(Embodiment 2)
FIG. 3 shows a second embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. As shown in FIG. 3, a lateral partition member 88 having a through hole 89 and having air permeability is installed in the exhaust gas passage 7. The horizontal partition member 88 divides the division chambers 7f, 7s, and 7t vertically.

  If the temperature of the exhaust gas discharged from the combustion space 5 is excessively high, the efficiency with which the purification catalyst carried on the catalyst carrier 100 purifies the exhaust gas is reduced, or the purification catalyst and / or the catalyst carrier 100 is removed. There is a risk of deterioration of In such a case, as shown in FIG. 3, the resistance member disposed in the exhaust gas passage 7 includes the first resistance member 102f formed of the catalyst carrier 100 having a purification catalyst for purifying the exhaust gas, and the exhaust gas. The gas passage 7 includes a second resistance member 102s disposed upstream of the first resistance member 102f and for reducing the temperature of the exhaust gas.

  As shown in FIG. 3, the second resistance member 102 s (cooling element) having both the function of purifying the exhaust gas and the function of cooling is placed on the horizontal partition member 88 and disposed upstream of the catalyst carrier 100. ing. Accordingly, the hot exhaust gas contacts the second resistance member 102s and is cooled before it contacts the purification catalyst supported on the catalyst carrier 100. For this reason, when the exhaust gas comes into contact with the catalyst carrier 100, an excessive increase in the temperature of the exhaust gas is suppressed.

  For this reason, even if the temperature of the exhaust gas immediately after being discharged from the combustion space 5 is excessively high, the purification efficiency with which the purification catalyst of the catalyst carrier 100 purifies the exhaust gas can be enhanced. In this way, the second resistance member 102s is not formed of a catalyst carrier that supports the purification catalyst, but is formed of a member that is based on a plurality of granular or spherical ceramics or metals that do not carry the purification catalyst. It is preferable that The ceramic member constituting the second resistance member 102s may be formed of an aggregate of ceramic fibers, or may be formed of a monolith structure. Examples of the ceramic forming the second resistance member 102s include alumina, silica, magnesia, zirconia, and aluminum nitride.

  As can be understood from FIG. 3, when attention is paid to the height direction of the exhaust gas passage 7 (arrow H direction), the accommodation height of the catalyst carrier 100 accommodated in the first division chamber 7f is H1, and the second division chamber. When the accommodation height of the catalyst carrier 100 accommodated in 7s is H2, and the accommodation height of the catalyst carrier 100 accommodated in the third divided chamber 7t is H3, the relationship of H2≈H1. The relationship is H2≈H3. However, the relationship of H2> H1. The relationship H2> H3 may be satisfied.

  Further, as can be understood from FIG. 3, when attention is paid to the height direction of the exhaust gas passage 7 (arrow H direction), the accommodation height of the second resistance member 102s accommodated in the first divided chamber 7f is M1, When the accommodation height of the second resistance member 102s accommodated in the second division chamber 7s is M2, and the accommodation height of the second resistance member 102s accommodated in the third division chamber 7t is M3, M2> M1 connection of. The relationship is M2> M3. Accordingly, the fluid resistance in the second divided chamber 7s is set to be larger than the fluid resistance in the first divided chamber 7f and the fluid resistance in the third divided chamber 7t. In other words, the pressure loss in the second division chamber 7s is set larger than the pressure loss in the first division chamber 7f and the pressure loss in the third division chamber 7t.

  According to the present embodiment as described above, in the exhaust gas passage 7, compared to before adjusting the pressure loss, the exhaust gas is less likely to flow into the second divided chamber 7 s, and the first divided chamber 7 f and the third divided chamber 7 t Becomes easier to flow. For this reason, compared to before adjusting the pressure loss, the distribution of the exhaust gas in the exhaust gas passage 7 is adjusted, so that the temperature of the second divided chamber 7s is shifted to a relatively lower level, and the first divided chamber 7f and The temperature of the third divided chamber 7t shifts relatively high. Thereby, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. As a result, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) can be made uniform. For this reason, the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction (arrow L direction) can be improved, and the power generation efficiency of the stack 2 can be improved.

  As described above, the temperature distribution of the stack 2 in the longitudinal direction of the stack 2 (arrow L direction) can be made uniform. For this reason, variation in the purification effect of the purification catalyst accommodated in each of the first division chamber 7f, the second division chamber 7s and the third division chamber 7t can be reduced, and the exhaust gas purification performance can be improved. it can. In addition, it is possible to reduce variations in the durability of the purification catalyst in each of the first division chamber 7f, the second division chamber 7s, and the third division chamber 7t.

  According to the present embodiment, as described above, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. For this reason, in exchanging heat between the exhaust gas flowing through the exhaust gas passage 7 and the cathode gas flowing through the cathode gas passage 8, the uniformity of heat exchange can be improved in the longitudinal direction (arrow L direction). For this reason, it can also contribute to the uniformity of the temperature of the cathode gas supplied to the stack 2, and can contribute to the reduction of power generation unevenness in the longitudinal direction (arrow L direction) of the stack 2. Therefore, it is possible to suppress unevenness in the power generation output in the longitudinal direction of the stack 2 and contribute to improving the power generation efficiency and durability of the stack 2.

(Embodiment 3)
FIG. 4 shows a third embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. As shown in FIG. 4, the exhaust gas passage 7 is provided with a horizontal partition member 88 extending along a direction intersecting with the flow direction of the exhaust gas flowing through the exhaust gas passage 7. The horizontal partition member 88 divides the division chambers 7f, 7s, and 7t vertically.

  As can be understood from FIG. 4, the horizontal partition member 88 is held in an intermediate region in the height direction of the exhaust gas passage 7 (corresponding to the gas flow direction in the exhaust gas passage 7, the direction of the arrow H), and has a plurality of through holes. It has a hole 89 and has gas permeability. A catalyst carrier 100 that can function as a pressure loss member or a resistance member is placed on and accommodated on a horizontal partition member 88. For this reason, the catalyst carrier 100 carrying the purification catalyst is disposed in the intermediate region in the exhaust gas passage 7 in the height direction (arrow H direction). In this case, it is possible to contribute to suppressing variation between the temperature at the upper end and the temperature at the lower end of the exhaust gas passage 7. Therefore, it is possible to contribute to improving the temperature uniformity in the height direction (arrow H direction) of the exhaust gas passage 7.

  As shown in FIG. 4, paying attention to the height direction (arrow H direction) of the exhaust gas passage 7, the accommodation height of the catalyst carrier 100 accommodated in the first division chamber 7f is H1, and the second division chamber 7s. If the housing height of the catalyst carrier 100 housed in the catalyst chamber 100 is H2, and the housing height of the catalyst carrier 100 housed in the third divided chamber 7t is H3, the relationship of H2> H1. The relationship is H2> H3. Therefore, the resistance of the second division chamber 7s is set to be larger than the resistance of the first division chamber 7f and the resistance of the third division chamber 7t. Therefore, the pressure loss in the second division chamber 7s is set larger than the pressure loss in the first division chamber 7f and the pressure loss in the third division chamber 7t.

  Also in this embodiment, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform as described above. For this reason, in exchanging heat between the exhaust gas flowing through the exhaust gas passage 7 and the cathode gas flowing through the cathode gas passage 8, the uniformity of heat exchange can be improved in the longitudinal direction (arrow L direction). For this reason, it can also contribute to the uniformity of the temperature of the cathode gas supplied to the stack 2, and can contribute to the reduction of power generation unevenness in the longitudinal direction (arrow L direction) of the stack 2. Therefore, it is possible to suppress unevenness in the power generation output in the longitudinal direction of the stack 2 and contribute to improving the power generation efficiency and durability of the stack 2.

(Embodiment 4)
FIG. 5 shows a fourth embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. As shown in FIG. 5, the catalyst carrier 100f is accommodated in the first division chamber 7f. The catalyst carrier 100s is accommodated in the second division chamber 7s. The catalyst carrier 100t is accommodated in the third division chamber 7t.

  Focusing on the height direction of the exhaust gas passage 7 (the direction of the arrow H), the height of the catalyst carrier 100f accommodated in the first divided chamber 7f is H1, and the catalyst carrier accommodated in the second divided chamber 7s. When the accommodation height of 100 s is H2, and the accommodation height of the catalyst carrier 100t accommodated in the third divided chamber 7t is H3, the relationship of H2≈H1. The relationship is H2≈H3. However, the particle size of the catalyst carrier 100f accommodated in the first divided chamber 7f is D1, and the particle size of the catalyst carrier 100s accommodated in the second divided chamber 7s is D2, and is accommodated in the third divided chamber 7t. If the particle size of the catalyst carrier 100t is D3, D2 is set smaller than D1 and D3. The particle size affects the passage of exhaust gas. If the accommodation heights of the catalyst carriers 100f, 100s, and 100t are the same, the smaller the particle diameter, the resistance to the passage of the exhaust gas, and the pressure loss is generated.

  According to the present embodiment as described above, in the exhaust gas passage 7, compared to before adjusting the pressure loss, the exhaust gas is less likely to flow into the second divided chamber 7 s, and the first divided chamber 7 f and the third divided chamber 7 t Becomes easier to flow. For this reason, compared with before adjusting a pressure loss, the temperature of the 2nd division chamber 7s shifts relatively low, and the temperature of the 1st division chamber 7f and the 3rd division chamber 7t shifts relatively high. Thereby, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. As a result, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) can be made uniform. For this reason, the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction (arrow L direction) can be improved, and the power generation efficiency of the stack 2 can be improved.

  Also in this embodiment, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform as described above. For this reason, in exchanging heat between the exhaust gas flowing through the exhaust gas passage 7 and the cathode gas flowing through the cathode gas passage 8, the uniformity of heat exchange can be improved in the longitudinal direction (arrow L direction). For this reason, it can also contribute to the uniformity of the temperature of the cathode gas supplied to the stack 2, and can contribute to the reduction of power generation unevenness in the longitudinal direction (arrow L direction) of the stack 2.

(Embodiment 5)
FIG. 6 shows a fifth embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. As shown in FIG. 6, the passage thickness of the first division chamber 7f, the passage thickness of the second division chamber 7s, and the passage thickness of the third division chamber 7t are set to the same dimension t1, respectively. When the resistance member that can function as the pressure loss member is not disposed in the exhaust gas passage 7, the pressure in the exhaust gas is reduced to the first division chamber 7f and the third division chamber 7t. A resistance member 106 formed of a corrugated plate is disposed to increase the pressure loss. In other words, in the divided chamber group 79, the first divided chamber 7f and the first divided chamber 7f, which are low-temperature-side divided chambers in which the temperature is relatively lower than the temperature of the second divided chamber 7s when the resistance member 106 is not accommodated. The resistance member F is not disposed in the three-divided chamber 7t. The resistance member 106 is not limited to a corrugated plate.

(Embodiment 6)
FIG. 7 shows a sixth embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. In the longitudinal direction of the stack 2 (the direction of the arrow L), the exhaust gas passage 7 is divided into four parts, and the first divided chamber 7f, the second divided chamber 7s, the third divided chamber 7t, and the fourth divided chamber 7e are divided. Have. The passage thickness of the first division chamber 7f, the passage thickness of the second division chamber 7s, the passage thickness of the third division chamber 7t, and the passage thickness of the fourth division chamber 7e are set to the same dimension t1, respectively. When attention is paid to the height direction of the exhaust gas passage 7, the accommodation height of the catalyst carrier 100 accommodated in the first division chamber 7f is H1, and the accommodation height of the catalyst carrier 100 accommodated in the second division chamber 7s. Is H2, the accommodation height of the catalyst carrier 100 accommodated in the third division chamber 7t is H3, and the accommodation height of the catalyst carrier 100 accommodated in the fourth division chamber is H4, H2, H3> The relationship is H1 and H2. The relationship is H2≈H3. The relationship is H1≈H2. Therefore, the pressure loss in the second division chamber 7s and the third division chamber 7t is set to be larger than the pressure loss in the first division chamber 7f and the pressure loss in the second division chamber 7s.

  As a result, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. Therefore, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) of the stack 2 can be made uniform. For this reason, the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction (arrow L direction) can be improved, and the power generation efficiency of the stack 2 can be improved.

(Embodiment 7)
FIG. 8 shows a seventh embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. In the longitudinal direction of the stack 2 (in the direction of the arrow L), the exhaust gas passage 7 is divided into five parts. The first divided chamber 7f, the second divided chamber 7s, the third divided chamber 7t, the fourth divided chamber 7e, and the It has 5 division chambers 7h. The first division chamber 7f accommodates a first monolith structure 104f in which a catalyst layer of a purification catalyst for purifying exhaust gas is supported on a carrier. A second monolith structure 104s in which a catalyst layer of a purification catalyst is supported on a carrier is accommodated in the second division chamber 7s. In the third division chamber 7t, a third monolith structure body 104t in which the catalyst layer of the purification catalyst is supported on the carrier is accommodated. The fourth division chamber 4e accommodates a fourth monolith structure 104e in which the catalyst layer of the purification catalyst is supported on the carrier. The fifth monolithic structure 104h in which the catalyst layer of the purification catalyst is supported on the carrier is accommodated in the fifth division chamber 4h.

  The pressure loss of the first monolith structure 104f is α1, the pressure loss of the second monolith structure 104s is α2, the pressure loss of the third monolith structure 104t is α3, and the pressure loss of the fourth monolith structure 104e is α4. Assuming that the pressure loss of the fifth monolith structure 104h is α5, α1≈α5 and α2≈α4. α3> (α2, α4)> (α1, α5).

  Therefore, the pressure loss in the third divided chamber 7t corresponding to the central region in the longitudinal direction (arrow L direction) is the pressure loss in the first divided chamber 7f, the pressure loss in the second divided chamber 7s, the pressure loss in the fourth divided chamber 7e, It is set larger than the pressure loss in the dividing chamber 8h. Further, the pressure loss in the first division chamber 7f and the pressure loss in the fifth division chamber 4h are set lower than the pressure loss in the second division chamber 7s and the pressure loss in the fourth division chamber 4e, respectively. For this reason, it is restricted that high temperature exhaust gas flows into the 3rd division room 7t, and the temperature of the 3rd decomposition room 7t falls compared with before pressure loss adjustment. As a result, the temperature distribution of the exhaust gas passage 7 in the longitudinal direction (arrow L direction) can be made uniform. As a result, the temperature distribution of the stack 2 in the longitudinal direction (arrow L direction) of the stack 2 can be made uniform. For this reason, the uniformity of the power generation output (power generation voltage) of the stack 2 in the longitudinal direction (arrow L direction) can be improved, and the power generation efficiency of the stack 2 can be improved.

(Embodiment 8)
FIG. 9 shows an eighth embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on portions different from the first embodiment. In the longitudinal direction of the stack 2 (arrow L direction), the passage forming member 7a that forms the exhaust gas passage 7 is formed with a plurality of guide portions 7s that form guide grooves 7m. When the fuel cell system is assembled, the partition member 86 is inserted into the guide groove 7m of the arbitrary guide portion 7s. Thereby, the space | interval dimension X between the partition members 86 which adjoin the partition chamber group 79 is made adjustable. Therefore, the interval dimension X can be adjusted according to the temperature of the installation environment of the fuel cell system (for example, a cold region).

(Other)
The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist. The following technical idea can also be grasped from the above description. Two sets of stacks 2 are provided so as to sandwich the third passage 83 of the cathode gas passage 8, but the present invention is not limited to this, and one set of stacks is provided adjacent to the third passage 83 of the cathode gas passage 8. The structure may be used. The stack 2 is formed by stacking a plurality of fuel cells in the thickness direction. However, the stack 2 is not limited thereto, and a stack may be formed by assembling a plurality of tube-type fuel cells. Even in this case, the stack extends in the longitudinal direction. According to the first embodiment described above, the reforming unit for reforming the fuel material is provided. However, in some cases, the stack is operating at a high temperature, so the reforming unit is abolished and the evaporation unit is used. The formed water vapor and fuel material may be supplied directly to the anode of the stack. The fuel is not limited to methane, but may be propane or butane. Although the exhaust gas passage 7 is divided into the divided chambers 7f, 7s, and 7t, it may be divided into four or more in the arrow L direction.

  [Additional Item 1] The stack has a stack extending in the longitudinal direction, an inlet through which the exhaust gas that has undergone a power generation reaction of the stack, and an outlet through which the exhaust gas is discharged. The stack extends along the longitudinal direction of the stack. An exhaust gas passage, and a cathode gas passage that can exchange heat with the exhaust gas passage, and the exhaust gas passage includes a plurality of divided chamber groups formed in the longitudinal direction of the stack, And a resistance member arranged in the exhaust gas passage, and at least a high temperature side division in which the temperature is relatively higher than the temperature of the other division chamber in a state where no resistance member is arranged in the division chamber group A resistance member is arranged in the chamber so that the pressure loss in the exhaust gas is higher than the pressure loss in the other divided chambers, and the uniformity in heat exchange between the exhaust gas and the cathode gas is increased in the stack longitudinal direction. It is to have a fuel cell device. In this case, the uniformity in heat exchange between the exhaust gas and the cathode gas in the longitudinal direction of the stack can be improved. The uniformity of the temperature of the cathode gas can be achieved. Therefore, the unevenness of the power generation output in the longitudinal direction can be reduced.

  [Additional Item 2] The stack has a stack extending in the longitudinal direction, an inlet through which exhaust gas that has undergone a power generation reaction of the stack, and an outlet through which the exhaust gas is discharged, and extends along the longitudinal direction of the stack. An exhaust gas passage provided, and the exhaust gas passage is disposed in the exhaust gas passage and a divided chamber group formed by a plurality of divided chambers divided in the longitudinal direction of the stack. And a resistance member.

  [Additional Item 3] The stack includes a stack extending in the longitudinal direction, an inlet through which exhaust gas that has undergone a power generation reaction of the stack, and an outlet through which the exhaust gas is discharged, and extends along the longitudinal direction of the stack. An exhaust gas passage provided, wherein the exhaust gas passage includes a resistance member disposed in the exhaust gas passage. The resistance member may be a catalyst carrier that supports a purification catalyst that purifies harmful components of exhaust gas.

  [Additional Item 4] The stack has a stack extending in the longitudinal direction, an inlet through which exhaust gas that has undergone a power generation reaction of the stack, and an outlet through which the exhaust gas is discharged, and extends along the longitudinal direction of the stack. A fuel cell device comprising an exhaust gas passage provided.

  The present invention can be used in, for example, fuel cell systems for stationary use, vehicle use, electrical equipment use, and electronic equipment use.

  1 is a fuel cell device, 2 is a stack, 20 is a fuel cell, 21 is an anode, 22 is a cathode, 3 is a substrate, 4 is a reformer, 40 is an evaporation unit, 42 is a reforming unit, 5 is a combustion space, 50 is a combustion flame, 7 is an exhaust gas passage, 7m is a guide groove, 7s is a guide portion, 8 is a cathode gas passage, 86 is a partition member, 7f is a first division chamber, 7s is a second division chamber, and 7t is a third portion. Reference numeral 89 denotes a division chamber group, reference numeral 100 denotes a catalyst carrier (resistance member), reference numeral 102 denotes a second resistance member, and reference numeral 104 denotes a monolith structure.

Claims (5)

A stack having a plurality of fuel cells arranged in parallel and extending in the longitudinal direction, an inlet through which exhaust gas that has undergone a power generation reaction of the stack, and an outlet through which the exhaust gas is discharged are provided, and the longitudinal direction of the stack And an exhaust gas passage extending along
The exhaust gas passage includes a division chamber group formed by a plurality of division chambers divided in the longitudinal direction of the stack, and a resistance member disposed in the exhaust gas passage,
Among the divided chamber groups, in the state where the resistance member is not arranged, at least the high temperature side divided chamber where the temperature is relatively higher than the temperature of the other divided chamber, fuel cell system enhances Ru than the pressure loss in the divided chamber resistance member is disposed.   2. The fuel cell device according to claim 1, wherein the resistance member is a catalyst carrier having a purification catalyst that purifies the exhaust gas, or a member formed of ceramics or metal that does not have a purification catalyst.   In Claim 1 or 2, the cathode gas passage through which the cathode gas before power generation reaction supplied to the stack flows is provided, the cathode gas which flows through the cathode gas passage, and the exhaust gas which flows through the exhaust gas passage, A fuel cell device in which the cathode gas passage and the exhaust gas passage are provided so that can exchange heat.   The resistance member according to claim 1, wherein the resistance member includes a first resistance member formed of a catalyst carrier having a purification catalyst for purifying the exhaust gas, and the first resistance member in the exhaust gas passage. And a second resistance member that is disposed upstream and reduces the temperature of the exhaust gas. In one of claims 1-4, wherein the resistance member is a fuel cell device is arranged in an intermediate area the in the direction in which the exhaust gas flows in the exhaust gas passage.

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