Method and system device for preparing hydrogen for purifying fuel cell

Abstract

The invention relates to the field of hydrogen purification, in particular to a method and a system device for preparing hydrogen for purifying a fuel cell. Raw material hydrogen exchanges heat with product gas and regeneration gas after passing through a heat exchange mechanism I, namely an N-stage heat exchanger, and after the temperature is reduced, a part of hydrogen is separated out and enters a refrigerating mechanism to obtain supercooled hydrogen; the raw material hydrogen and the supercooled hydrogen are cooled by a heat exchange mechanism II and then enter an adsorption mechanism, and impurities in the raw material hydrogen are purified by a low adsorption mechanism until the requirements of hydrogen for the fuel cell are met, so that hydrogen product gas for the fuel cell is obtained; cold hydrogen is heated by a heater, the heated hydrogen is used as a medium for regeneration reconstitution and thermal regeneration of the low-temperature adsorption mechanism, and the purified product gas returns to the heat exchange mechanism I to exchange heat with the raw material hydrogen, is heated and then is output to storage equipment or other treatment equipment. The impurity content S in the obtained product gas is less than 0.004 ppm, the CO content is less than 0.02 ppm, and the long-period stable operation of the fuel cell is ensured.

Description

technical field [0001] The invention relates to the field of hydrogen purification and purification, in particular to a method for preparing and purifying hydrogen for fuel cells and a system device thereof. Background technique [0002] The proton membrane fuel cell is a new type of fuel cell, and its electrolyte is a solid organic membrane, which can conduct protons under humidified conditions. Proton membrane fuel cells use hydrogen as fuel, which can convert hydrogen into electricity. It is a very important clean energy source. Its characteristics require that the content of some impurities such as CO and sulfide in the hydrogen entering the fuel cell is very low, below the ppm level, reaching The ppb level is lower than the content standard of conventional pure hydrogen and high-purity hydrogen. [0003] The current national standard has a pure hydrogen content of 99.99%, of which the CO content is less than 5ppm. In high-purity hydrogen, the hydrogen content is greate...

AI Technical Summary

Problems solved by technology

[0008] None of the purification schemes disclosed above involve the purification of sulfide in hydrogen to 4ppb, so that hydrogen cannot reach the purification target of hydrogen for fuel cells, and because liquid nitrogen is used as a continuous cold source for low-temperature adsorption at the same time, there is a liquid nitrogen Nitrogen is easy to evaporate and requires special liquid nitrogen storage equipment for storage and transportation. At the same time, the continuous use of liquid nitrogen also causes technical problems of high purification costs.

Images