Hydrogen circulating system of fuel cell system

Abstract

The invention relates to a hydrogen circulation system of a fuel cell system, which comprises a hydrogen source, a valve group, a vortex tube, a first ejector, a second ejector and a gas-water separator, the output end of the hydrogen source is connected to the input end of the vortex tube through the valve group, and the cold end outlet of the vortex tube is connected to the jet inlet of the first ejector. The hot end outlet is connected to the jet flow inlet of the second ejector, the drainage inlet of the first ejector is connected to the hydrogen outlet of the fuel cell, the outlet of the first ejector is connected to the inlet of the gas-water separator, the gas outlet of the gas-water separator is connected to the drainage inlet of the second ejector, and the outlet of the second ejector is connected to the hydrogen inlet of the fuel cell. Compared with the prior art, the water environment of the anode side of the fuel cell can be improved, the performance of the fuel cell is improved, the service life of the fuel cell is prolonged, the control of a hydrogen circulation system is simplified, the operation reliability is improved, the size is reduced, and the power density of the fuel cell system is improved.

Description

technical field [0001] The invention relates to a hydrogen circulation system, in particular to a hydrogen circulation system of a fuel cell system. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy. The fuel cell system has high energy conversion efficiency and is an ideal energy utilization method. There is a broad prospect for commercial application. In practice, in order to avoid problems such as power generation performance degradation caused by low reaction gas concentration and water flooding caused by reduced gas flow, the supply of hydrogen and oxygen to the fuel cell must be higher than the amount consumed by the electrochemical reaction. In order to improve the utilization rate of hydrogen and at the same time carry out effective water management for fuel cells, hydrogen recycling is a very effective method. Generally, two methods are used for the hydrogen circulation o...

AI Technical Summary

Problems solved by technology

In the limited space of a highly integrated fuel cell system, it is impossible to design a large and complex gas-water separation device, so it is difficult to guarantee the separation efficiency of liquid water

Moreover, there is condensation after the circulating hydrogen gas with high temperature and saturated humidity is mixed with low temperature dry hydrogen gas, which also aggravates the difficulty of draining water on the anode side of the fuel cell.

Existing technology is difficult to further reduce the humidity in circulating hydrogen

If the traditional condensation method is used to dehumidify, the hydrogen needs to be heated after cooling down, which makes the system very complicated and increases the power consumption inside the fuel cell system

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