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Heat-retention and heating of reaction gas in fuel cell system

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, electrical components, etc., can solve problems such as hindering the flow of fuel gas and incomplete removal of water

Inactive Publication Date: 2008-03-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the technology of Patent Document 1 does not completely remove all the water in the fuel gas circulation path.
Also, when the fuel cell system stops operating in a low-temperature environment, the water in the fuel gas circulation path that is not completely removed freezes in the pipes, and thus may hinder the flow of fuel gas when it is operated again

Method used

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  • Heat-retention and heating of reaction gas in fuel cell system
  • Heat-retention and heating of reaction gas in fuel cell system
  • Heat-retention and heating of reaction gas in fuel cell system

Examples

Experimental program
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Effect test

no. 1 example

[0026] A1. The overall composition of the device:

[0027] A2. The temperature of the fuel gas when the operation is stopped and when the operation is started:

no. 3 example

[0030] D. Variations:

[0031] A. The first embodiment:

[0032] A1. The overall composition of the device:

[0033] FIG. 1 is a block diagram showing a schematic configuration of a fuel cell system 10 as a first embodiment of the present invention. The fuel cell system 10 includes: a fuel cell 22 , which is the main body of power generation; a hydrogen tank 23 , which supplies hydrogen to the fuel cell 22 ; and an air compressor 24 , which supplies compressed air to the fuel cell 22 . Various fuel cells can be used as the fuel cell 22, and a solid polymer fuel cell is used in this embodiment. The fuel cell 22 has a stack structure in which a plurality of single cells are stacked.

[0034] The hydrogen tank 23 may be, for example, a hydrogen bottle storing high-pressure hydrogen. Alternatively, it may be a tank that has a hydrogen storage alloy inside and stores hydrogen by absorbing hydrogen in the hydrogen storage alloy. After the hydrogen gas stored in the hydrogen tan...

Deformed example 2

[0089] In the above-described embodiment, a part of the anode exhaust path 63 and the first circulation path 60 j through which the fuel gas containing moisture flows is covered with the heat exchange portion 41 t of the cooling water path 41 , respectively. And, among the pipes constituting them, the ratio of the surface area of ​​the pipes located in the heat exchange portion 41t is about 65%. However, other configurations may be employed for the cooling water path, the anode exhaust path, and the hydrogen gas supply path. However, it is preferable that the proportion of the surface area of ​​the pipes located in the cooling water path among the pipes for circulating the fuel gas be 50% or more. And, it is more preferable that this ratio is 60% or more, and it is still more preferable that it is 70% or more.

[0090] In addition, in the above-described embodiment, a part of the second circulation path 63w is covered by the heat exchange portion 41t of the cooling water path...

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PUM

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Abstract

Disclosed is a technique for reducing problems caused by freezing of water within a reaction gas passage in a fuel cell system. Specifically disclosed is a fuel cell system comprising a fuel cell, a reaction gas passage where a reaction gas supplied to or discharged from the fuel cell flows through, and a coolant passage where a coolant after cooling the fuel cell flows through. The coolant passage is so arranged that it covers at least a part of the reaction gas passage. By having such a structure, the reaction gas passage of the fuel cell system is enabled to keep the heat in or heated. Consequently, problems caused by freezing of water in the reaction gas passage can be reduced in such a fuel cell system.

Description

technical field [0001] The present invention relates to a technology for reducing possible damage due to freezing of water in a reaction gas flow path in a fuel cell system. Background technique [0002] Conventionally, a fuel cell system has been developed that generates electricity by reacting a fuel gas and an oxidizing gas. In a fuel cell based on an electrolyte membrane, water generated on the cathode side permeates to the anode side through the electrolyte membrane. Therefore, water exists in the fuel gas circulation path of the fuel cell system. Some fuel cell systems discharge excess water in the fuel gas circulation path to the outside of the system through a gas-liquid separator provided in the fuel gas circulation path. [0003] However, the technique of Patent Document 1 does not completely remove all the water in the fuel gas circulation path. Also, when the fuel cell system stops operating in a low-temperature environment, water in the fuel gas circulation p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04
CPCH01M8/04253Y02E60/50H01M8/04029
Inventor 平形修二
Owner TOYOTA JIDOSHA KK