Fuel cell heat balance gas-gas-gas three-phase heat exchange system

Abstract

The invention provides a fuel cell heat balance gas-gas-gas three-phase heat exchange system. The system comprises a hydrogen conveying pipeline, a compressed air conveying pipeline, a deionized waterconveying pipeline and a fuel cell stack. The system is characterized by further comprising a heat exchange device which is arranged on the hydrogen conveying pipeline and the compressed air conveying pipeline and can realize heat exchange between the hydrogen conveying pipeline and the compressed air conveying pipeline. The temperature of hydrogen and the temperature of compressed air are detected through the hydrogen temperature sensor and the compressed air temperature sensor; a central processing unit receives and processes the signals to control a heat exchange fan of the heat exchange device, so that the temperature of the compressed air is reduced; a plurality of hydrogen capillary tubes and a plurality of air capillary tubes in the heat exchange device are in large-area contact with the heat exchange fins for heat transfer, so that the heat of the compressed air quickly compensates the temperature of the hydrogen, the temperature difference between the two is rapidly reduced,the normal service life of the battery is ensured, and the battery is not rapidly aged; and deionized water is heated by a compensation heater to realize rapid cold start of the system.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a heat exchange system for fuel cell heat balance. Background technique [0002] At present, the fuel cell system uses compressed hydrogen as fuel. The current pressure of compressed hydrogen in China can reach 35MPa. In order to avoid the impact loss of hydrogen on the membrane electrodes under high pressure, hydrogen can enter the fuel cell stack after multi-stage decompression. [0003] According to Boyle's law and Charles-Gaylusac's law, a certain amount of gas, the product of volume and pressure is proportional to the thermodynamic temperature, so the temperature of hydrogen drops after decompression. In the prior art, the temperature of the compressed air after compression is too high, and the temperature of the hydrogen entering the fuel cell stack is lower than the temperature of the compressed air entering the fuel cell stack, resulting in a gradient temperature diffe...

AI Technical Summary

Problems solved by technology

In the prior art, the temperature of the compressed air after compression is too high, and the temperature of the hydrogen entering the fuel cell stack is lower than the temperature of the compressed air entering the fuel cell stack, resulting in a gradient temperature difference between the fuel cell stack and the gradient temperature difference on both sides of the membrane electrode, and the membrane electrode is long Accelerated aging and damage are prone to occur under the working condition of gradient temperature difference for a long time, which seriously affects the service life of the fuel cell

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