Hydrogen fuel cell low-temperature operation support device

Abstract

The invention relates to the technical field of hydrogen fuel cells, in particular to a hydrogen fuel cell low-temperature operation supporting device. A hydrogen fuel cell low-temperature operation supporting device is suitable for an air cooling hydrogen fuel cell stack and comprises an air inlet cover, an air inlet heating device, a backflow air duct, a backflow heating device, a backflow fan, an exhaust cover, a main fan and an end plate heating device. Waste heat and water are utilized by refluxing high-temperature tail gas, the inlet air temperature is improved through the inlet air heating device, the uniformity of the stack temperature is improved through the end plate heating device, and the temperature of hydrogen entering the stack is improved through the high-temperature tail gas, so that the purpose of maintaining stable operation of the hydrogen fuel cell stack in a low-temperature environment is achieved; the heat reflection material and the thermal insulation material greatly reduce heat loss during low-temperature operation of the hydrogen fuel cell stack, so that the normal working temperature of the stack can be maintained, and the environment temperature lower limit of stable operation of the hydrogen fuel cell can be reduced.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cells, in particular to a hydrogen fuel cell low-temperature operation supporting device. Background technique [0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of the hydrogen-oxygen reaction into electrical energy through an electrochemical reaction. The hydrogen fuel cell system is mainly composed of a stack, a hydrogen supply system, an oxygen supply system, a water heat management system and a control system. composition. The product of the hydrogen fuel cell reaction is water. When the ambient temperature is lower than the freezing point, the excess water will condense into ice, thereby blocking the reaction gas passage in the membrane electrode, affecting the operation of the hydrogen fuel cell stack, and reducing the performance of the hydrogen fuel cell stack. , and even cause irreversible serious damage. In addition, lower ambie...

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Problems solved by technology

The invention has complex mechanical structure and bulky volume, does not fully consider the complexity of low temperature operation, and the degree of low temperature tolerance is limited

[0006] CN106910920A discloses an auxiliary device for starting a fuel cell at low temperature, including a fuel cell stack, an electric heating device, a main fan, a casing, a circulating fan and a circulating air channel; the problem of low-temperature starting of a fuel cell is solved by using hot tail gas circulation, Can reduce start-up energy consumption while shortening start-up time, but does not solve the problem of maintaining stable operation of air-cooled hydrogen fuel cell stacks at low temperatures

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