Multi-nozzle ejector suitable for hydrogen fuel cell system and hydrogen fuel cell system

Abstract

The invention belongs to the field of ejectors and fuel cells, and provides a multi-nozzle ejector suitable for a hydrogen fuel cell system and the hydrogen fuel cell system. The multi-nozzle ejector comprises primary flow pipes, a multi-nozzle structure, a suction chamber, a secondary flow inlet, a mixing chamber and a diffusion chamber; the primary flow pipes, the multi-nozzle structure, the mixing chamber and the diffusion chamber communicate in sequence along the axis; the suction chamber and the secondary flow inlet are formed in the two sides of the multi-nozzle structure respectively and communicate with the mixing chamber; the number of the primary flow pipes is equal to that of nozzles in the multi-nozzle structure, and the primary flow pipes communicate with the nozzles in one-to-one correspondence; the primary flow pipes are used for receiving the decompressed high-pressure hydrogen, a low-pressure area is formed at the outlet of the multi-nozzle structure to suck gas at the anode outlet of a fuel cell communicating with the secondary flow inlet, and the gas is mixed by the mixing chamber and then fed into the fuel cell; and the working state of each nozzle in the multi-nozzle structure is determined by the output power of the fuel cell.

Description

technical field [0001] The invention belongs to the field of ejectors and fuel cells, in particular to a multi-nozzle ejector suitable for hydrogen fuel cell systems and the hydrogen fuel cell system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The proton exchange membrane fuel cell is an energy conversion device that converts the chemical energy of hydrogen into electrical energy. Due to its advantages of high efficiency, fast start-up, high power density, and low operating sound, it has become a green alternative to the internal combustion engine as the power source of automobiles. substitute. As one of the important subsystems in the fuel cell, the hydrogen supply subsystem usually uses a mechanical pump to recycle hydrogen to improve the hydrogen utilization rate of the fuel cell. However, the mechanical pump has high cost, poor s...

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Problems solved by technology

However, the inventors found that since the position of the injection needle needs to be controlled with high precision and a stable working environment, this will make the driving device of the ejector extremely complicated, and it is not suitable for a dynamic vehicle fuel cell steam system

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