process for the removal of carbon dioxide damiscele and particularly for conversion into fuel cells h2.c2 alkaline

摘要

1392082 Fuel cells VARTA AG 20 March 1972 [27 March 1971] 12838/72 Heading H1B A fuel cell 16 is supplied at 3 with hydrogen derived from a hydrogen reformer 14, CO 2 being removed from the gas mixture by an absorber 9. The gas absorber 9 is of the kind having interconnected coarse and fine pores, the gas mixture flowing through the coarse pores and washing liquid flowing through the fine pores. The washing liquid flows through a recirculating path including a desorber 10 and pump 11 and returns to the absorber 9, the CO 2 being discharged to the atmosphere at 8. Air enters the fuel cell through a pump 21, and may leave at 6 and be supplied at 7 to the desorber whereby the nitrogen in the air may serve to remove the CO 2 . The pump 11 may be controlled by a CO 2 concentration detector 20 so that the rate of washing liquid circulated is related to the fuel cell output. To ensure that the gas pores of the hydrogen electrodes in the fuel cell are not flooded by electrolyte and that the coarse gas pores of the absorber 9 are not flooded by the washing liquid, it is necessary to control both the pressure of the washing liquid and the pressure of the hydrogen gas in relation to the pressure of the electrolyte in the fuel cell. This is done by valves 13, 15 controlled, respectively, by pressure comparators 19, 18.