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, which comprises the following steps: when a fuel cell runs, the temperature Tin of a cooling liquid inlet of an electric pile and the temperature Tout of a cooling liquid outlet of the an electric pile are detected in real time, and the real-time power generation power P of the electric pile is calculated; and the detected temperature is compared with a temperature threshold, a four-way valve is adjusted through calculation based on the temperature and the generated power, and different waste heat recovery modes are started. The heat energy utilization rate is increased, the requirement for the heat dissipation capacity of a heat dissipation fan is lowered, the power consumption of a heat dissipation system is lowered, and meanwhile noise is reduced. The four-way valve is adjusted through calculation according to the temperature and the generated power, so that the internal temperature of the electric pile can be accurately regulated by utilizing waste heat, the condition of local supercooling or local superheating is avoided, and the performance of the fuel cell is favorably exerted.

Description

technical field [0001] The invention belongs to the technical field of liquid hydrogen fuel cells, and in particular relates to a control method for a liquid hydrogen fuel cell waste heat recovery system. Background technique [0002] Countries around the world are currently devoting themselves to the development of low-pollution new energy sources, such as solar energy and wind energy, but they are greatly affected by the natural environment and cannot provide continuous and stable energy output. Hydrogen is a clean energy carrier. When generating energy, it only generates water and has no pollution to the environment. It is a bridge connecting renewable energy and traditional fossil energy. The utilization of hydrogen energy has great energy strategic significance. [0003] About 50% of the energy of the fuel cell is converted into heat energy when generating electricity, but its optimum operating temperature is 60-70°C. Currently, the more common waste heat treatment meth...

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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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