Fuel cell system and method for stopping power generation in fuel cell system

摘要

An oxygen-containing gas supply device of a fuel cell system is equipped with an oxygen-containing gas supply flow passage that communicates with an oxygen-containing gas inlet of a fuel cell. An oxygen-containing gas discharge flow passage communicates with an oxygen-containing gas outlet of the fuel cell. A compressor is disposed in the oxygen-containing gas supply flow passage and a supply flow passage sealing valve is disposed downstream from the compressor in the oxygen-containing gas supply flow passage. A discharge flow passage sealing valve is disposed in the oxygen-containing gas discharge flow passage, and a discharge fluid circulation flow passage that communicates with the oxygen-containing gas discharge flow passage is disposed at a location upstream from the discharge flow passage sealing valve, while also communicating with the oxygen-containing gas supply flow passage at a location upstream from the compressor.

主权项

1. A fuel cell system comprising:
a fuel cell that generates electric power through an electrochemical reaction between an oxygen-containing gas, which is supplied to a cathode, and a fuel gas, which is supplied to an anode; an oxygen-containing gas supply device for supplying the oxygen-containing gas to the fuel cell; and a fuel gas supply device for supplying the fuel gas to the fuel cell, wherein the oxygen-containing gas supply device comprises: an oxygen-containing gas supply flow passage that communicates with an oxygen-containing gas inlet of the fuel cell; an oxygen-containing gas discharge flow passage that communicates with an oxygen-containing gas outlet of the fuel cell; a compressor disposed in the oxygen-containing gas supply flow passage; a supply flow passage sealing valve disposed in the oxygen-containing gas supply flow passage at a location downstream from the compressor; a discharge flow passage sealing valve disposed in the oxygen-containing gas discharge flow passage; and a discharge fluid circulation flow passage connected to the oxygen-containing gas discharge flow passage at a location upstream from the discharge flow passage sealing valve, while also connecting to the oxygen-containing gas supply flow passage at a location upstream from the compressor, wherein the discharge fluid circulation flow passage is configured to allow the oxygen-containing gas to flow from the oxygen-containing gas discharge flow passage to the oxygen-containing gas supply flow passage.