A kind of control method of liquid hydrogen fuel cell waste heat recovery system

Abstract

The invention discloses a control method of a liquid hydrogen fuel cell waste heat recovery system, comprising the steps of: when the fuel cell is running, real-time detection of a stack cooling liquid inlet temperature T in , the stack coolant outlet temperature T out , and calculate the real-time power generation power P of the stack; compare the detected temperature with the temperature threshold, adjust the four-way valve based on the temperature and power generation after calculation, and enter different waste heat recovery modes. The invention improves the utilization rate of heat energy, reduces the requirement for the heat dissipation capacity of the heat dissipation fan, reduces the power consumption of the heat dissipation system, and reduces noise at the same time; the four-way valve is calculated and controlled in combination with the temperature and the power generation power, and the internal temperature of the stack can be accurately adjusted by using the waste heat. There will be no local overcooling or local overheating, which is beneficial to the performance of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of liquid hydrogen fuel cells, and in particular relates to a control method of a liquid hydrogen fuel cell waste heat recovery system. Background technique [0002] Countries around the world are currently working on developing new energy sources with low pollution, such as solar energy and wind energy, but they are greatly affected by the natural environment and cannot provide a sustained and stable energy output. Hydrogen is a clean energy carrier. It only generates water when generating energy, which is non-polluting to the environment. It is a bridge connecting renewable energy and traditional fossil energy. It has great energy strategic significance for the utilization of hydrogen energy. [0003] About 50% of the energy of the fuel cell is converted into heat energy when generating electricity, but its optimal operating temperature is 60-70°C. At present, the more common method of residual heat treatm...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a control method for a liquid hydrogen fuel cell waste heat recovery system, which improves the utilization rate of heat energy, reduces the heat dissipation capacity requirements of the heat dissipation fan, reduces the power consumption of the heat dissipation system, and reduces noise at the same time; The temperature and power generation calculation control four-way valve can accurately adjust the internal temperature of the stack by using the waste heat, and there will be no local overcooling or local overheating, which is conducive to the performance of the fuel cell

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