Modeling method of hydrogen circulating pump in fuel cell system

Abstract

The invention discloses a modeling method of a hydrogen circulating pump in a fuel cell system. A mathematical model of outlet flow of the hydrogen circulating pump, inlet and outlet pressure, inlet temperature and rotating speed is established on the basis of measured data; a mathematical model of the pump efficiency is established on the basis of the flow model, and the power consumption of the hydrogen circulating pump is obtained; and performing simulation prediction on the hydrogen circulating pump under different gas inlet pressures based on the flow model and the efficiency model, and comparing experimental results to verify the accuracy of the model and the feasibility of the method. The modeling method of the hydrogen circulating pump is fast and efficient, and the flow performance under the conditions of inlet pressure and temperature change of the hydrogen circulating pump in an actual test is considered. The output characteristics of the hydrogen circulating pump are obtained by judging the conditions of the inlet and the outlet of the hydrogen circulating pump, and certain guiding significance is achieved for control over a circulation path of a fuel cell system.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a modeling method of a hydrogen circulation pump in a fuel cell system. Background technique [0002] At present, the world is reducing carbon emissions to ensure that carbon peaks and carbon neutrality are achieved. As a new energy battery, fuel cell is characterized by zero emission and high energy conversion efficiency. It has become an important direction of new energy vehicle research. [0003] In the fuel cell system, if the hydrogen supply is insufficient, the output performance of the fuel cell will be unstable, causing damage to the stack; if the hydrogen supply is too large, the discharge of unreacted hydrogen will cause waste of resources, and there are also certain safety hazards. . Adding a circulation pipeline to the fuel cell system can effectively improve the hydrogen utilization rate and the efficiency of the fuel cell stack. The hydrogen and water vapor ...

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Problems solved by technology

The modeling method in the above invention only considers the relationship between the outlet pressure and the flow rate and speed of the hydrogen circulation pump, and does not consider the condition change of the inlet of the hydrogen circulation pump. In actual tests, the pressure and temperature of the inlet of the hydrogen circulation pump vary with the operation of the stack changes, the gas flow through the hydrogen circulation pump is also changing

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