A pemfc cold start system and control method with nitrogen doping and hydrogen purging device

Abstract

The invention provides a PEMFC cold start system and control method with nitrogen-doped and hydrogen purging devices, including a controller FCU, a PEMFC stack, an air system, a nitrogen system, a hydrogen system, a gas purging device, and a gas mixing device And the temperature and humidity acquisition device, the anode and cathode on the PEMFC stack are respectively connected to the temperature and humidity acquisition device, the controller FCU is connected to the temperature and humidity acquisition device, the anode on the PEMFC stack is connected to the hydrogen system, and the nitrogen system is connected to the hydrogen system. The nitrogen system and the hydrogen system are connected to the air system, the gas mixing device is arranged on the pipeline between the air system and the nitrogen system, and the nitrogen system is connected to the gas heating device. The invention creates a PEMFC cold-start system and control method with nitrogen-doped and hydrogen purging devices, which has high heating efficiency and compact structure, and is suitable for low-temperature cold-start operations in various environments. This technology is mainly used for fuel cell vehicles.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a PEMFC cold start system and a control method with nitrogen-doped and hydrogen purging devices. Background technique [0002] With the rapid development of the global economy, the demand and consumption of energy are increasing rapidly, and non-renewable energy sources such as oil, coal, and natural gas are gradually being exhausted, and the environmental pollution brought about is also becoming more and more serious. Hydrogen energy has the advantages of large potential, clean and low-carbon, good combustion performance, and diversified storage and transportation. Fuel cells are an important way to efficiently utilize hydrogen energy. Proton exchange membrane fuel cells involve many fields, including vehicles, aerospace, ships, etc., especially in fuel cell power stations, electric vehicles, high-efficiency portable power supplies, etc., have great market potential. In t...

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Problems solved by technology

At present, the patents of PEMFC cold start system and control method also have their own advantages and disadvantages. For example, the publication number: CN110931829A, this patent heats hydrogen and air separately during cold start, and uses a heatable nitrogen purge device to purge the cathode and anode of PEMFC at the end of the work. , although this patent can prevent the stack from freezing after the fuel cell works in a low temperature environment, it consumes a large amount of gas and has a low purge efficiency; the announcement number: CN210723237U, this patent divides the fuel cell system into three parts, respectively It is the first gas circuit, the second gas circuit and heating components and is controlled by the central control system. It has high cold start efficiency and sufficient heating, but its control logic is relatively complicated and energy consumption is relatively large; announcement number: CN209374566U, the patented design A micro-pump circulation system is used for heat preservation and heating of the stack, which can assist the cold start process, but it cannot solve the freezing phenomenon of the fuel cell when it is below 0°C for a long time

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