JP2015210861A - Fuel battery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery system that can more effectively utilize heat of exhaust gas from a fuel battery unit as compared with prior arts.SOLUTION: A fuel battery system 100 has a fuel battery unit 103 having a fuel battery 101, a first gas flow passage through which exhaust gas discharged from the fuel battery unit 103 flows, a second gas flow passage 105 through which oxygen-containing gas supplied to the fuel battery unit 103 flows, a housing 106 in which the fuel battery unit 103, the first gas flow passage 104 and a second gas flow passage 105 are mounted, a ventilator 107 for ventilating the inside of the housing, a gas inlet 109 provided to the housing 106, and an exhaust port 110 which is provided to the housing 106 and discharges exhaust gas. The first gas flow passage 104 is disposed above the flow of ventilated gas occurring in the housing when the ventilator 107 operates, and at least a part of the ventilated gas passing through the first gas flow passage 104 flows into the second gas flow passage 105.

Description

  The present invention relates to a fuel cell system.

  The fuel cell system generates power using a hydrogen-containing gas and an oxygen-containing gas. For example, in a solid oxide fuel cell system, the fuel cell unit includes a fuel cell that is a power generation unit. The fuel cell unit uses hydrogen and oxygen for power generation of the fuel cell, and uses combustion heat of the anode off-gas of the fuel cell for heating the fuel cell. In order to efficiently perform the power generation reaction of the fuel cell, the fuel cell unit is operated at a high temperature (for example, 600 ° C. to 800 ° C.).

  Thus, in order to operate the fuel cell system with high efficiency, it is necessary to maintain the fuel cell at an optimum temperature.

  However, since the air used for power generation is taken from the outside of the fuel cell system, it is almost the same as the installation environment temperature (normal temperature) of the fuel cell system, and if supplied as it is, the temperature of the fuel cell decreases, and the efficiency of the fuel cell system Decreases.

  Therefore, as a means for suppressing the above-described effect, a technique has been proposed in which air is supplied to the fuel cell unit after raising the temperature of the air by using heat radiation of the fuel cell unit (for example, Patent Document 1).

JP 2007-207441 A

  However, in patent document 1, the point which utilizes the heat | fever of the waste gas from a fuel cell unit effectively is not examined.

  An aspect of the present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel cell system that can effectively use the heat of exhaust gas from a fuel cell unit as compared with the prior art. And

  A fuel cell system according to an aspect of the present invention includes a fuel cell unit including a fuel cell, a first gas passage through which exhaust gas discharged from the fuel cell unit flows, and an oxygen-containing gas supplied to the fuel cell unit. A second gas channel that flows; a housing that houses the fuel cell unit, the first gas channel, and the second gas channel; a ventilator that ventilates the interior of the housing; and the housing. An air supply port and an exhaust port provided in the housing for exhausting the exhaust gas, wherein the first gas flow path is configured to supply ventilation gas generated in the housing when the ventilator is operating. The ventilation gas that is disposed on the flow and that has passed through the first gas passage is configured to flow into the second gas passage.

  The fuel cell system of one embodiment of the present invention can effectively use the heat of the exhaust gas from the fuel cell unit as compared with the conventional one.

FIG. 1 is a diagram illustrating an example of a fuel cell system according to the first embodiment. FIG. 2 is a diagram illustrating an example of a fuel cell system according to the second embodiment. FIG. 3 is a diagram illustrating an example of a fuel cell system according to the second embodiment. FIG. 4 is a diagram illustrating an example of a fuel cell system according to the third embodiment. FIG. 5 is a diagram illustrating an example of a fuel cell system according to the fourth embodiment.

(First embodiment)
The present inventors diligently studied to effectively use the heat of exhaust gas from the fuel cell unit, and obtained the following knowledge.

  In Patent Document 1, the exhaust gas after being used for heating the fuel cell unit is discharged out of the system as it is. That is, the heat of the exhaust gas from the fuel cell unit is not effectively used, and the efficiency of the fuel cell system is not sufficiently improved.

  Therefore, the fuel cell system of the present embodiment includes a fuel cell unit including a fuel cell, a first gas passage through which exhaust gas discharged from the fuel cell unit flows, and an oxygen-containing gas supplied to the fuel cell unit. A housing containing the two gas passages, the fuel cell unit, the first gas passage and the second gas passage, a ventilator for ventilating the inside of the housing, an air supply port provided in the housing, The first gas flow path is disposed on the flow of the ventilation gas generated in the housing when the ventilator is operating, and the first gas is provided in the body. At least a part of the ventilation gas that has passed through the flow path is configured to flow into the second gas flow path.

  With this configuration, the heat of the exhaust gas from the fuel cell unit can be used more effectively than in the past. Specifically, when the ventilation gas passes through the first gas flow path, the heat of the exhaust gas in the first gas flow path is recovered by the ventilation gas. Therefore, when such ventilation gas flows into the second gas flow path, the ventilation gas can be used for power generation of the fuel cell unit, and the heat of the exhaust gas can be effectively used in power generation of the fuel cell unit.

[Device configuration]
FIG. 1 is a diagram illustrating an example of a fuel cell system according to the first embodiment.

  In the example shown in FIG. 1, the fuel cell system 100 of the present embodiment includes a fuel cell unit 103, a first gas flow path 104, a second gas flow path 105, a housing 106, a ventilator 107, A vent 109 and an exhaust 110 are provided.

  The fuel cell unit 103 includes a fuel cell 101. The fuel cell unit 103 may include a reformer that generates a hydrogen-containing gas by a reforming reaction using raw materials. When the reformer is not provided, the hydrogen-containing gas may be supplied to the fuel cell unit 103 from a hydrogen-containing gas supply source such as a hydrogen storage gas storage container or a hydrogen infrastructure. Alternatively, the hydrogen-containing gas may be generated by the reforming reaction in the fuel cell 101. As such an example, an internal reforming type solid oxide fuel cell can be mentioned. In the case of a solid oxide fuel cell, the reforming reaction and the operating temperature of the fuel cell are high temperatures (for example, 600 ° C.-800 ° C.), so the periphery of the fuel cell unit 103 is covered with a heat insulating material and exposed to the outside. In many cases, the heat release is reduced. In addition to the fuel cell 101, the fuel cell unit 103 may include an air heater that heats power generation air using the high temperature inside the fuel cell unit 103.

  The reforming reaction in the fuel cell unit 103 may take any form. For example, steam reforming reaction, autothermal reaction, partial oxidation reaction, etc. are illustrated as reforming reaction. Although not shown in FIG. 1, equipment required for each reforming reaction is provided as appropriate. For example, if the reforming reaction is a steam reforming reaction, an evaporator that generates steam and a water supply unit that supplies water to the evaporator are provided. If the reforming reaction is partial oxidation or autothermal reaction, an air supply device for supplying air is further provided.

  In addition, a raw material contains the organic compound comprised from carbon and hydrogen at least, such as city gas which has methane as a main component, natural gas, or LPG. When this raw material is used for the reforming reaction, the sulfur compound used as an odorant is removed and used. Therefore, the fuel cell system 100 generally includes a desulfurizer (not shown) that removes sulfur compounds in the raw material.

  The fuel cell 101 of the fuel cell unit 103 may be any type. Examples of the fuel cell 101 include a polymer electrolyte fuel cell, a solid oxide fuel cell, and a phosphoric acid fuel cell. Moreover, the structure of the cells constituting the fuel cell 101 may be any type. Examples of the cell structure include a flat plate type, a cylindrical type, and a cylindrical flat plate type.

  As described above, the fuel cell 101 of the fuel cell unit 103 can generate power using the hydrogen-containing gas.

  The exhaust gas discharged from the fuel cell unit 103 flows through the first gas flow path 104. The exhaust gas is at least one of a combustion exhaust gas obtained by burning the anode off gas, an anode off gas, and a cathode off gas. When the exhaust gas is combustion exhaust gas, the fuel cell unit 103 includes a combustor.

  In addition, when combustion exhaust gas flows into the 1st gas flow path 104, since the temperature of combustion exhaust gas is high temperature (for example, 200 degreeC-300 degreeC) and combustion exhaust gas is acidic gas, 1st gas flow The flow path member forming the path 104 is preferably composed of a material having heat resistance and corrosion resistance. Examples of the material of the flow path member include metal materials such as stainless steel.

  The oxygen-containing gas supplied to the fuel cell unit 103 flows through the second gas channel 105. For example, air is exemplified as the oxygen-containing gas. Thereby, the fuel cell 101 of the fuel cell unit 103 can generate power using the oxygen-containing gas.

  The channel member forming the second gas channel 105 can be made of a heat resistant material of about 100 ° C. Examples of the material of the flow path member include a stainless steel metal material or a resin material such as polyethylene, silicone, or fluorine.

The housing 106 accommodates the fuel cell unit 103, the first gas channel 104, and the second gas channel 105.
The housing 106 is a member that isolates the fuel cell system 100 from the external environment. Therefore, the housing 106 is preferably made of a material having rigidity and corrosion resistance. Examples of the material of the housing 106 include metal materials such as stainless steel. Note that a heat insulating material may be disposed on the inner surface of the housing 106.

  The ventilator 107 ventilates the inside of the housing 106. The ventilator 107 may have any configuration as long as the inside of the housing 106 can be ventilated. Specifically, the ventilator 107 can be configured in any configuration as long as the temperature of the auxiliary machine and the substrate in the housing 106 can be maintained within the operating temperature range and a sufficient amount of ventilation gas can be secured to recover heat from the exhaust gas. There may be.

  For example, the ventilator 107 includes a blower and an opening structure. Due to the opening structure, the ventilation gas is discharged out of the housing 106. Moreover, a fan etc. are illustrated as an air blower, for example. Examples of the fan include a sirocco fan and a DC fan.

  The air supply port 109 is provided in the housing 106. The air supply port 109 has an opening structure, and ventilation gas flows into the housing 106 by this opening structure. As ventilation gas, outside air etc. are illustrated, for example.

  The exhaust port 110 is provided in the housing 106 and exhausts the exhaust gas. The exhaust port 110 has an opening structure. The opening structure communicates with the first gas flow path 104, and exhaust gas is discharged out of the housing 106 by this opening structure.

  As shown in FIG. 1, in the present embodiment, the first gas flow path 104 is disposed on the flow of ventilation gas generated in the housing 106 when the ventilator 107 is operating. Specifically, a part of the ventilation gas immediately after flowing in from the air supply port 109 moves upward along the wall portion of the housing 106 and passes through the first gas flow path 104. Thereby, the ventilation gas is heated by the heat of the exhaust gas in the first gas flow path 104. That is, the ventilation gas collects the heat of the exhaust gas flowing through the first gas flow path 104.

  Then, at least a part of the ventilation gas that has passed through the first gas flow path 104 flows into the second gas flow path 105. For example, at least a part of the ventilation gas can flow into the second gas flow path 105 by operating an oxygen-containing gas supply device (not shown) provided in the second gas flow path 105.

  The oxygen-containing gas supply device may be an oxidant gas supply device that supplies an oxidant gas to the cathode gas flow path of the fuel cell unit 103. Further, an air supply unit that supplies air used for the reforming reaction to a reformer (not shown) in the fuel cell unit 103 may be used. Examples of the reforming reaction in which air is used include partial oxidation and autothermal. Further, the oxygen-containing gas supply device may be an air supply device that supplies combustion air to a combustor (not shown) in the fuel cell unit 103.

  As described above, the heat of the exhaust gas from the fuel cell unit 103 can be used more effectively than in the past. Specifically, when the ventilation gas passes through the first gas channel 104, the heat of the exhaust gas in the first gas channel 104 is recovered by the ventilation gas. Therefore, when such ventilation gas flows into the second gas flow path 105, the ventilation gas can be used for power generation of the fuel cell unit 103, and the heat of the exhaust gas can be effectively used in power generation.

(Second Embodiment)
The fuel cell system according to the present embodiment is a partition wall that divides the inside of the housing into a first chamber having a fuel cell unit and a second chamber having a first gas flow path and an exhaust port in the fuel cell system of the first embodiment. And a communication port provided in the partition wall for communicating the first chamber and the second chamber.

  With this configuration, a ventilation gas path for recovering the heat of the fuel cell unit, which is a heating element having a large heat capacity, is appropriately formed in the first chamber as compared with the case where the housing is not divided into the first chamber and the second chamber. obtain. Further, a ventilation gas path for recovering the heat of the exhaust gas flowing through the first gas flow path can be appropriately formed in the second chamber. Furthermore, the order of the first chamber and the second chamber through which the ventilation gas passes can be selected as appropriate. Therefore, compared with the case where the inside of the housing is not divided into the first chamber and the second chamber, the heat of the fuel cell unit and the exhaust gas can be efficiently recovered by the ventilation gas.

  The fuel cell system of the present embodiment may be configured in the same manner as the fuel cell system of the first embodiment except for the above features.

[Device configuration]
2 and 3 are diagrams illustrating an example of the fuel cell system according to the second embodiment.

  In the example shown in FIGS. 2 and 3, the fuel cell system 100 includes a fuel cell unit 103, a first gas channel 104, a second gas channel 105, a housing 106, a ventilator 107, and an air supply A port 109, an exhaust port 110, a partition wall 201, and a communication port 204 are provided.

  Since the fuel cell unit 103, the first gas flow path 104, the second gas flow path 105, the housing 106, the ventilator 107, the air supply port 109, and the exhaust port 110 are the same as those in the first embodiment, description thereof is omitted. .

  The partition wall 201 divides the inside of the housing 106 into a first chamber 202 including the fuel cell unit 103 and a second chamber 203 including the first gas flow path 104 and the exhaust port 110. The partition wall 201 may have any configuration as long as the inside of the housing 106 can be divided into the first chamber 202 and the second chamber 203. The partition wall 201 can control the flow of ventilation gas between the first chamber 202 and the second chamber 203.

  In addition, as a material of the housing | casing 106, metal materials, such as stainless steel, etc. are illustrated, for example. Accordingly, the rigidity of the housing 106 can be increased using the partition wall 201.

  The communication port 204 is provided in the partition wall 201 and communicates the first chamber 202 and the second chamber 203.

  The communication port 204 may have any configuration as long as the first chamber 202 and the second chamber 203 can communicate with each other. Such communication port 204 allows ventilation gas to pass from a specific location of the partition wall 201. Examples of the communication port 204 include a single opening or an opening including a minute punching hole such as a punch metal.

  In the example shown in FIG. 2, the air supply port 109 is provided above the side wall of the first chamber 202, the ventilator 107 is provided above the side wall of the second chamber 203, and the communication port 204 is connected to the partition wall 201. It is provided below. Therefore, the ventilation gas enters the first chamber 202 from the air supply port 109 and recovers the heat of the fuel cell unit 103. Thereafter, the ventilation gas passes through the communication port 204, enters the second chamber 203, and recovers the heat of the exhaust gas flowing through the first gas flow path 104. Then, at least a part of the ventilation gas flows into the second gas flow path 105.

  In the example shown in FIG. 3, the air supply port 109 is provided below the side wall of the second chamber 203, the ventilator 107 is provided above the side wall of the first chamber 202, and the communication port 204 is connected to the partition wall 201. It is provided above. Therefore, the ventilation gas enters the second chamber 203 from the air supply port 109 and recovers the heat of the exhaust gas flowing through the first gas flow path 104. Thereafter, the ventilation gas passes through the communication port 204, enters the first chamber 202, and recovers the heat of the fuel cell unit 103. Then, at least a part of the ventilation gas flows into the second gas flow path 105.

  As described above, the first chamber 202 has a ventilation gas path for recovering the heat of the fuel cell unit 103, which is a heating element having a large heat capacity, as compared with the case where the housing 106 is not divided into the first chamber 202 and the second chamber 203. Can be formed appropriately within. Further, a ventilation gas path for recovering the heat of the exhaust gas flowing through the first gas flow path 104 can be appropriately formed in the second chamber 203. Furthermore, the order of the first chamber 202 and the second chamber 203 through which the ventilation gas passes can be appropriately selected. Therefore, the heat of the fuel cell unit 103 and the exhaust gas can be efficiently recovered by the ventilation gas as compared with the case where the inside of the housing is not divided into the first chamber and the second chamber.

  In addition, said partition 201 is an illustration and is not limited to this example. For example, the partition may include two or more communication portions.

(Example)
In the fuel cell system according to the example of the second embodiment, in the fuel cell system of the second embodiment, the ventilation gas flows into the second gas flow path after taking in hot air accumulated above the first chamber. It is configured.

  The hot air heated by the fuel cell unit stays above the first chamber. Therefore, the ventilation gas takes in the hot air accumulated above the first chamber and then flows into the second gas flow path, whereby the heat of the fuel cell unit can be efficiently recovered by the ventilation gas.

  The fuel cell system of this example may be configured in the same manner as the fuel cell system of the second embodiment except for the above features.

[Device configuration]
The apparatus configuration of the fuel cell system 100 of this example is the same as that of the second embodiment.

  In the example shown in FIG. 2, the ventilation gas enters the first chamber 202 from the air supply port 109 and recovers the heat of the fuel cell unit 103. At this time, the hot air heated by the fuel cell unit 103 stays above the first chamber 202. In this example, since the air supply port 109 is provided above the side wall of the first chamber 202, the ventilation gas can take in hot air accumulated above the first chamber 202. Thereafter, in the second chamber 203, at least a part of the ventilation gas flows into the second gas flow path 105.

  In the example shown in FIG. 3, the ventilation gas passes through the communication port 204 and enters the first chamber 202. At this time, the hot air heated by the fuel cell unit 103 stays above the first chamber 202. In this example, since the communication port 204 is provided above the partition wall 201, the ventilation gas can take in hot air accumulated above the first chamber 202. Thereafter, at least part of the ventilation gas flows into the second gas flow path 105.

  As described above, the ventilation gas takes in the hot air accumulated above the first chamber 202 and then flows into the second gas flow path 105, whereby the heat of the fuel cell unit 103 can be efficiently recovered by the ventilation gas. .

(Third embodiment)
The fuel cell system according to the third embodiment is the fuel cell system according to the second embodiment or the example of the second embodiment, wherein an oxygen-containing gas supplier for supplying an oxygen-containing gas and a raw material supplied to the fuel cell unit are provided. A flowing third gas channel and a raw material supplier for supplying the raw material are provided, and at least one of the oxygen-containing gas supplier and the raw material supplier is provided in the second chamber.

  With this configuration, at least one of the oxygen-containing gas supply device and the raw material supply device can be isolated from the first chamber that houses the fuel cell unit that is a heating element. Therefore, compared with the case where an oxygen-containing gas supply device and a raw material supply device are provided in the first chamber, it is possible to suppress performance degradation due to a thermal load on at least one of the oxygen-containing gas supply device and the raw material supply device.

  The fuel cell system according to the present embodiment may be configured in the same manner as the fuel cell system according to the second embodiment or the example of the second embodiment except for the above characteristics.

[Device configuration]
FIG. 4 is a diagram illustrating an example of a fuel cell system according to the third embodiment.

  In the example shown in FIG. 4, the fuel cell system 100 of the present embodiment includes a fuel cell unit 103, a first gas flow path 104, a second gas flow path 105, a housing 106, a ventilator 107, The air port 109, the exhaust port 110, the partition wall 201, the communication port 204, an oxygen-containing gas supply unit 401, a third gas flow path 402, and a raw material supply unit 403 are provided.

  The fuel cell unit 103, the first gas flow path 104, the second gas flow path 105, the housing 106, the ventilator 107, the air supply port 109, the exhaust port 110, the partition wall 201, and the communication port 204 are the same as in the second embodiment. Therefore, explanation is omitted.

The oxygen-containing gas supply unit 401 supplies an oxygen-containing gas. Oxygen-containing gas is supplied to the fuel cell unit 103 by the oxygen-containing gas supply device 401. The oxygen-containing gas supply unit 401 may be an oxidant gas supply unit that supplies an oxidant gas to the cathode gas flow path of the fuel cell unit 103. Further, an air supply unit that supplies air used for the reforming reaction to a reformer (not shown) in the fuel cell unit 103 may be used. Examples of the reforming reaction in which air is used include partial oxidation and autothermal. Further, the oxygen-containing gas supply unit 401 may be an air supply unit that supplies combustion air to a combustor (not shown) in the fuel cell unit 103.
Further, the oxygen-containing gas supply unit 401 may have any configuration as long as it can supply an oxygen-containing gas. Examples of the oxygen-containing gas supply device 401 include a pump or a fan. Examples of the pump include an electromagnetic induction diaphragm pump. An example of the fan is a sirocco fan.

  In the third gas flow path 402, the raw material supplied to the fuel cell unit 103 flows. As described above, the raw material contains an organic compound composed of at least carbon and hydrogen, such as city gas, natural gas, or LPG mainly composed of methane. The raw material is supplied from a raw material supply source. The raw material supply source has a predetermined supply pressure, and examples thereof include a raw material cylinder or a raw material infrastructure.

  The raw material supplier 403 supplies raw materials. The raw material is supplied to the fuel cell unit 103 by the raw material supplier 403. The raw material supplier 403 may have any configuration as long as the raw material can be supplied. An example of the raw material supplier 403 is a pump. Examples of the pump include an electromagnetic induction type diaphragm pump or a motor type bellows type pump.

  In the present embodiment, the oxygen-containing gas supply device 401 and the raw material supply device 403 are provided in the second chamber 203. Specifically, the oxygen-containing gas supply unit 401 is disposed in the second gas flow path 105 in the second chamber 203, and the raw material supply unit 403 is connected to the third gas flow path 402 in the second chamber 203. It is arranged.

  As described above, the oxygen-containing gas supply device 401 and the raw material supply device 403 can be isolated from the first chamber 202 in which the fuel cell unit 103 that is a heating element is stored. Therefore, compared with the case where the oxygen-containing gas supply unit 401 and the raw material supply unit 403 are provided in the first chamber 202, it is possible to suppress the performance degradation due to the thermal load on the oxygen-containing gas supply unit 401 and the raw material supply unit 403.

  In addition, arrangement | positioning of said oxygen containing gas supply device 401 and raw material supply device 403 is an illustration, Comprising: It is not limited to this example. For example, even if only the oxygen-containing gas supply unit 401 is provided in the second chamber 203, it is possible to suppress the performance degradation due to the heat load on the oxygen-containing gas supply unit 401. Further, by providing only the raw material supply unit 403 in the second chamber 203, it is possible to suppress the performance degradation due to the thermal load on the raw material supply unit 403.

(Fourth embodiment)
The fuel cell system according to the fourth embodiment is the fuel cell system according to any one of the first embodiment, the second embodiment, the example of the second embodiment, and the fuel cell system according to the third embodiment. The heat recovery device is disposed on the flow of ventilation gas generated in the housing when the ventilator is operated, and at least one of the ventilation gas that has passed through the heat recovery device. The part is configured to flow into the second gas flow path.

  With this configuration, the heat transfer performance from the exhaust gas flowing through the first gas flow path to the ventilation gas using the heat recovery device is improved. Therefore, compared with the case where this heat recovery device is not used, the heat of the exhaust gas flowing through the first gas flow path can be efficiently recovered by the ventilation gas.

  The fuel cell system of the present embodiment may be configured in the same manner as the fuel cell system of any of the first embodiment, the second embodiment, the example of the second embodiment, and the third embodiment except for the above characteristics. Good.

[Device configuration]
FIG. 5 is a diagram illustrating an example of a fuel cell system according to the fourth embodiment.

  In the example shown in FIG. 5, the fuel cell system 100 of the present embodiment includes a fuel cell unit 103, a first gas channel 104, a second gas channel 105, a housing 106, a ventilator 107, The air inlet 109, the exhaust outlet 110, and the heat recovery device 501 are provided.

  Since the fuel cell unit 103, the first gas flow path 104, the second gas flow path 105, the housing 106, the ventilator 107, the air supply port 109, and the exhaust port 110 are the same as those in the first embodiment, description thereof is omitted. .

  The heat recovery unit 501 recovers heat from the exhaust gas in the first gas flow path 104. Further, the heat recovery unit 501 is disposed on the flow of ventilation gas generated in the housing 106 when the ventilator 107 is operating. Then, at least a part of the ventilation gas that has passed through the heat recovery device 501 is configured to flow into the second gas flow path 105. Specifically, the heat recovery device 501 is provided in the first gas flow path 104, and a part of the ventilation gas immediately after flowing in from the air supply port 109 is directed upward along the wall portion of the housing 106, It passes through the heat recovery unit 501 on the first gas flow path 104.

  The heat recovery device 501 may have any configuration as long as heat can be recovered from the exhaust gas in the first gas flow path 104. Examples of the heat recovery device 501 include a radiator or a heat exchanger. Examples of the heat radiator include metal cooling fins. Examples of the heat exchanger include a plate heat exchanger having exhaust gas as a primary side and ventilation gas as a secondary side.

  As described above, the heat transfer performance from the exhaust gas flowing through the first gas flow path 104 to the ventilation gas using the heat recovery device 501 is improved. Therefore, compared to the case where such a heat recovery device 501 is not used, the heat of the exhaust gas flowing through the first gas flow path 104 can be efficiently recovered by the ventilation gas.

(Fifth embodiment)
The fuel cell system according to the fourth embodiment operates the ventilator in the fuel cell system according to any one of the first embodiment, the second embodiment, the example of the second embodiment, the third embodiment, and the fourth embodiment. In this case, the flow rate of the ventilation gas generated in the housing is larger than the flow rate of the oxygen-containing gas supplied to the fuel cell unit.

  With this configuration, the heat of the exhaust gas in the first gas flow path can be recovered with the ventilation gas having a higher flow rate than the oxygen-containing gas.

  The fuel cell system of this embodiment is the same as the fuel cell system of any one of the first embodiment, the second embodiment, the example of the second embodiment, the third embodiment, and the fourth embodiment, except for the above features. You may comprise.

[Device configuration]
The apparatus configuration of the fuel cell system 100 of the present embodiment is the same as that of any of the first embodiment, the second embodiment, the example of the second embodiment, the third embodiment, and the fourth embodiment.

  In the present embodiment, the flow rate of the ventilation gas generated in the housing 106 when the ventilator 107 is operating is larger than the flow rate of the oxygen-containing gas supplied to the fuel cell unit 103.

  With this configuration, the heat of the exhaust gas in the first gas channel 104 can be recovered by the ventilation gas having a higher flow rate than the oxygen-containing gas.

  According to one embodiment of the present invention, heat of exhaust gas from a fuel cell unit can be used more effectively than in the past. Thus, one embodiment of the present invention can be used in, for example, a fuel cell system.

DESCRIPTION OF SYMBOLS 100 Fuel cell system 101 Fuel cell 103 Fuel cell unit 104 1st gas flow path 105 2nd gas flow path 106 Housing | casing 107 Ventilator 109 Supply port 110 Exhaust port 201 Partition 202 First chamber 203 Second chamber 204 Communication port 401 Oxygen-containing gas supply unit 402 Third gas flow path 403 Raw material supply unit 501 Heat recovery unit

Claims (6)

A fuel cell unit comprising a fuel cell;
A first gas flow path through which exhaust gas discharged from the fuel cell unit flows;
A second gas passage through which an oxygen-containing gas supplied to the fuel cell unit flows;
A housing that houses the fuel cell unit, the first gas flow path, and the second gas flow path;
A ventilator for ventilating the inside of the housing;
An air supply opening provided in the housing;
An exhaust port provided in the housing and from which the exhaust gas is discharged;
The first gas flow path is disposed on the flow of ventilation gas generated in the housing when the ventilator is operating, and at least a part of the ventilation gas that has passed through the first gas flow path Is a fuel cell system configured to flow into the second gas flow path. A partition that divides the inside of the housing into a first chamber including the fuel cell unit and a second chamber including the first gas flow path and the exhaust port;
2. The fuel cell system according to claim 1, further comprising: a communication port provided in the partition wall and communicating with the first chamber and the second chamber.   The fuel cell system according to claim 2, wherein the ventilation gas is configured to flow into the second gas flow path after taking in hot air accumulated above the first chamber. An oxygen-containing gas supplier for supplying the oxygen-containing gas;
A third gas flow path through which the raw material supplied to the fuel cell unit flows;
A raw material supplier for supplying the raw material,
The fuel cell system according to claim 2 or 3, wherein at least one of the oxygen-containing gas supply device and the raw material supply device is provided in the second chamber. A heat recovery device for recovering heat from the exhaust gas of the first gas flow path;
The heat recovery unit is disposed on the flow of the ventilation gas, and is configured such that at least a part of the ventilation gas that has passed through the heat recovery unit flows into the second gas flow path. The fuel cell system according to any one of 1-4.   The fuel cell system according to claim 1, wherein a flow rate of the ventilation gas is larger than a flow rate of the oxygen-containing gas.

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