Fuel cell system

Abstract

To suppress the generation of condensed water and suppress the flow of the condensed water into a fuel cell stack. A fuel cell system comprises: a fuel cell stack, an elector set, a fuel gas supplier which supplies fuel gas to the ejector set, a circulation flow path, a mixed gas supply flow path, a temperature detector which detects a temperature of the fuel gas, and a controller, wherein the ejector set includes at least two ejectors in parallel, which are a first ejector that supplies first mixed gas to the fuel electrodes of the fuel cell stack, and a second ejector that supplies second mixed gas, in which a content ratio of the circulation gas is smaller than the first mixed gas, to the fuel electrodes of the fuel cell stack.

Description

technical field [0001] The present disclosure relates to fuel cell systems. Background technique [0002] Fuel cells use hydrogen (H 2 ) and oxygen (O 2 ) electrochemical reaction, and a power generation device that extracts electric energy from a fuel cell stack (hereinafter, sometimes referred to as a battery stack) in which a plurality of single cells are stacked. In addition, in the following, fuel gas and oxidant gas may be simply referred to as "reaction gas" and "gas" without particularly distinguishing them. [0003] A unit cell of the fuel cell is generally composed of a membrane electrode assembly (MEA: Membrane Electrode Assembly) and, if necessary, two separators sandwiching both sides of the membrane electrode assembly. [0004] The membrane electrode assembly has the following configuration, that is, with protons (H + ) A conductive solid polymer electrolyte membrane (hereinafter also simply referred to as "electrolyte membrane") is formed with a catalyst l...

AI Technical Summary

Problems solved by technology

Moreover, if low-temperature fuel gas is supplied to the injector, and the fuel gas merges with the circulating gas containing moisture from the circulation flow path in the injector, there may be a possibility that the injector and the injector may Condensation occurs at the outlet, etc.

Moreover, if the dew condensation water enters the fuel cell stack, the power generation performance of the fuel cell stack may decrease.

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