CN-122025696-A - Fuel cell system

CN122025696ACN 122025696 ACN122025696 ACN 122025696ACN-122025696-A

Abstract

The invention relates to a fuel cell, which sufficiently suppresses heat dissipation to the outside of a casing and further improves power generation efficiency. The fuel cell system includes a fuel cell, a combustion unit, a plurality of heat exchange units, and a case having heat insulation properties for accommodating the heat exchange units. The plurality of heat exchange sections each have a low-temperature gas flow path through which a low-temperature gas, which is a fuel gas or an oxidant gas supplied to the fuel cell, flows, and a high-temperature gas flow path through which a high-temperature gas, which is an exhaust gas discharged from the fuel cell or a combustion exhaust gas discharged from the combustion section, flows, and exchange heat between the low-temperature gas and the high-temperature gas. At least the fuel cell, the combustion unit, and the plurality of heat exchange units are arranged so that a temperature zone of the first layer, the second layer, and the third layer is formed in this order from the central portion of the internal space of the case, the fuel cell is arranged in the first layer, the combustion unit is arranged in the first layer or the second layer, one or more of the plurality of heat exchange units is arranged in the second layer, and one or more other of the plurality of heat exchange units is arranged in the third layer.

Inventors

Watari masuhide
Rattan to bring it
Funayama yasumi

Assignees

株式会社爱信

Dates

Publication Date: 20260512
Application Date: 20251031
Priority Date: 20241108

Claims (5)

1. A fuel cell system is characterized by comprising: A fuel cell that generates electricity by a reaction between a fuel gas supplied to a fuel electrode and an oxidant gas supplied to an oxidant electrode; a combustion unit that burns a combustible gas; A plurality of heat exchange sections each having a low-temperature gas flow path through which a low-temperature gas, which is a fuel gas or an oxidant gas, supplied to the fuel cell flows, and a high-temperature gas flow path through which a high-temperature gas, which is an exhaust gas discharged from the fuel cell or a combustion exhaust gas discharged from the combustion section, flows, and exchanging heat between the low-temperature gas flowing through the low-temperature gas flow path and the high-temperature gas flowing through the high-temperature gas flow path, and A case having heat insulation properties and accommodating the fuel cell, the combustion section, and the plurality of heat exchange sections, At least the fuel cell, the combustion section, and the plurality of heat exchange sections are arranged in layers so that temperature zones of a first layer, a second layer, and a third layer are formed in this order from a central portion of the internal space of the case to the outside, The fuel cell is disposed in the first layer, The combustion section is disposed in the first layer or the second layer, More than one heat exchanging part of the plurality of heat exchanging parts is arranged on the second layer, One or more other heat exchanging portions among the plurality of heat exchanging portions are arranged in the third layer.
2. The fuel cell system according to claim 1, wherein, The plurality of heat exchanging portions include: A first heat exchange unit that has a fuel gas flow path through which the fuel gas flows as the low-temperature gas and a first combustion exhaust gas flow path through which the combustion exhaust gas flows as the high-temperature gas, and that exchanges heat between the fuel gas flowing through the fuel gas flow path and the combustion exhaust gas flowing through the first combustion exhaust gas flow path; A second heat exchange portion having a first oxidizing gas flow path through which the oxidizing gas flows as the low-temperature gas and a second combustion exhaust gas flow path through which the combustion exhaust gas flows as the high-temperature gas passes through the first heat exchange portion, and exchanging heat between the oxidizing gas flowing through the first oxidizing gas flow path and the combustion exhaust gas flowing through the second combustion exhaust gas flow path, and A third heat exchange unit that has a second oxidizing gas flow path through which the oxidizing gas passes as the low-temperature gas in the second heat exchange unit and an exhaust gas flow path through which the fuel exhaust gas or the oxidizing exhaust gas passes as the high-temperature gas, and exchanges heat between the oxidizing gas flowing through the second oxidizing gas flow path and the fuel exhaust gas or the oxidizing exhaust gas flowing through the exhaust gas flow path, The one or more heat exchanging portions are the first heat exchanging portion and the third heat exchanging portion, The one or more other heat exchange portions are the second heat exchange portions.
3. The fuel cell system according to claim 2, comprising: A fuel gas supply line for supplying the fuel gas to the fuel electrode; a condensing unit disposed outside the casing and configured to condense water vapor contained in the fuel exhaust gas; a fuel exhaust gas supply line for supplying the fuel exhaust gas to the condensation unit; a return line that returns a part of the fuel off-gas having passed through the condensation unit to the fuel gas supply line; a combustion fuel supply line for supplying another part of the fuel exhaust gas having passed through the condensation section to the combustion section, and An oxidizer exhaust gas supply line for supplying the oxidizer exhaust gas discharged from the oxidizer electrode to the combustion part, The third heat exchange portion has a fuel exhaust passage through which the fuel exhaust gas flows as the high-temperature gas, and exchanges heat between the oxidizing gas flowing through the second oxidizing gas passage and the fuel exhaust gas flowing through the fuel exhaust passage, The fuel exhaust gas supply line supplies the fuel exhaust gas having passed through the third heat exchange portion to the condensation portion.
4. The fuel cell system according to any one of claim 1 to 3, wherein, The one or more heat exchange portions are arranged to cover at least a part of the fuel cell and the combustion portion by a combination with a heat insulating material.
5. The fuel cell system according to any one of claim 1 to 3, wherein, The one or more other heat exchanging portions are arranged so as to cover the one or more heat exchanging portions by a combination with a heat insulating material.

Description

Fuel cell system Technical Field The present invention relates to a fuel cell system. Background Conventionally, there has been proposed a fuel cell device including a fuel cell that generates electricity by reforming gas and electricity generation air, a combustor that combusts exhaust gas of the reforming gas discharged from the fuel cell and exhaust gas of the electricity generation air together, a first air heat exchanger that includes a combustion exhaust gas path through which combustion exhaust gas generated by the combustor flows and a first air supply path through which electricity generation air flows and exchanges heat between the combustion exhaust gas and the electricity generation air, a fuel cell housing that houses the fuel cell and flows exhaust gas of the electricity generation air discharged from the fuel cell, a second air heat exchanger that includes a second air supply path through which electricity generation air flowing through the first air supply path is supplied to the fuel cell and exchanges heat between the exhaust gas of the electricity generation air flowing through the second air supply path, and a frame that houses each member, wherein the first air supply path and the second air supply path are arranged so as to cover the entire member housed in the frame (for example, refer to patent document 1). According to this fuel cell device, the heat dissipation to the outside can be suppressed, and the temperature of the air for power generation and the temperature of each part of the fuel cell device can be easily controlled. Patent document 1 Japanese patent application laid-open No. 2017-199658 In the fuel cell system described above, the entire member housed in the housing is covered with the air supply paths (the first air supply path and the second air supply path), but in this case, the effect of suppressing heat dissipation to the outside of the housing is insufficient, and there is a concern that the power generation efficiency may be lowered. Disclosure of Invention The main object of the present invention is to sufficiently suppress heat dissipation to the outside of a case and to further improve the power generation efficiency. The present invention adopts the following means in order to achieve the above-described main object. Specifically, the first fuel cell system according to the present invention includes a fuel cell that generates electricity by a reaction between a fuel gas supplied to a fuel electrode and an oxidant gas supplied to an oxidant electrode, a combustion unit that combusts a combustible gas, a plurality of heat exchange units each having a low-temperature gas flow path through which a low-temperature gas, which is a fuel gas or an oxidant gas supplied to the fuel cell, flows, and a high-temperature gas flow path through which a high-temperature gas, which is an exhaust gas discharged from the fuel cell or a combustion exhaust gas discharged from the combustion unit, flows, wherein the low-temperature gas flowing through the low-temperature gas flow path exchanges heat with the high-temperature gas flowing through the high-temperature gas flow path, and a case that has heat insulation and accommodates the fuel cell, the combustion unit, and the plurality of heat exchange units, wherein at least the fuel cell, the combustion unit, and the plurality of heat exchange units are arranged in layers in a layered manner such that a temperature zone of a first layer, a second layer, and a third layer are formed in this order from a central portion of an inner space of the case to an outer side, and the first heat exchange unit, and the second heat exchange unit are arranged in the first layer, and the second heat exchange unit are arranged in the heat exchange layer. In the first fuel cell system of the present invention, at least the fuel cell, the combustion section, and the plurality of heat exchange sections are arranged in layers so that the temperature zones of the first layer, the second layer, and the third layer are formed in this order from the central portion inside the case, the fuel cell is arranged in the first layer, the combustion section is arranged in the first layer or the second layer, one or more of the plurality of heat exchange sections is arranged in the second layer, and one or more other of the plurality of heat exchange sections is arranged in the third layer. This makes it possible to transfer heat from the fuel cell or the combustion unit, which is a high-temperature component disposed in the central portion, to the component (the plurality of heat exchange units) disposed on the outer side, and to suppress heat dissipation from the high-temperature component. As a result, heat dissipation to the outside of the case can be sufficiently suppressed, and the power generation efficiency can be further improved. The second fuel cell system according to the present invention includes a fuel cell that generates electricity by a reaction