A vehicle fuel cell tail gas nitrogen production system and its purging method

Abstract

The invention relates to the technical field of new energy vehicles, and discloses a vehicle fuel cell tail gas nitrogen production system and a purging method thereof, including an air filter, an air compressor, an intercooler, a humidifier, and a fuel cell sequentially connected through pipelines , the inlet port of the fuel cell cathode is connected to the humidifier pipeline, the anode inlet port is connected to the hydrogen cylinder, and the cathode outlet port is connected to the nitrogen cylinder pipeline; a first gas-water separation is arranged in sequence in the pipeline from the fuel cell cathode outlet end to the nitrogen cylinder device, nitrogen-oxygen separator and pressurizer, and also includes a plurality of solenoid valves. In the present invention, not only the nitrogen gas used for purging the fuel cell is prepared and reserved, but also the separated oxygen is added to the loop of the fuel cell cathode inlet air again. In the process, the cathode air intake of the fuel cell is enriched with oxygen, which improves the working performance of the fuel cell; during the purging process, it is ensured that there will be no liquid water in the cathode and anode, which further reduces the amount of liquid water in the fuel cell. There is a risk of freezing.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a vehicle fuel cell tail gas nitrogen production system and a purging method thereof. Background technique [0002] At present, the development of new energy vehicles has become the top priority of my country's automobile development. Among them, hydrogen fuel cell vehicles, as a branch of new energy vehicles, have attracted worldwide attention. The proton exchange membrane fuel cell unit is mainly composed of membrane electrodes, sealing rings, and flow field plates with gas channels. Membrane electrode is the core part of proton exchange membrane fuel cell, and there is a very thin membrane in the middle - proton exchange membrane. This membrane does not conduct electrons and is an excellent conductor of hydrogen ions. It serves as an electrolyte to provide channels for hydrogen ions. It is also used as a diaphragm to isolate the two poles of the reaction gas. On ...

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Problems solved by technology

[0010] This method will not only cause waste of energy, but also reduce the cruising range of the vehicle, and is not applicable

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