Assessment of Technology and Application to Gas Separation Membrane on Molten Carbonate Fuel Cell System (Part 1). Investigation of CO(sub 2) Separation Process.

摘要

The gas separation membrane was applied to the molten carbonate fuel cell(MCFC). It is essential to supply CO2 to the cathode to continue the reaction and the same amount of CO2 generated at the anode was used as the supplying source. The power generating efficiency was lowered because the nonreacted H2 and CO of anode exhaust gas were now burnt to CO2. The performance may be improved if the CO2 in the anode exhaust gas will be separated by the gas separation membrane and simultaneously nonreacted H2 and CO will be circulated at the anode. The overall generated power(A) and sending end efficiency(B) were higher by 1.3% and 0.6% respectively in the hot potassium carbonate process than the combustion process. A and B were higher by 7.5% and 3.7% in the anode exhaust gas processing method using porous membrane. Further A and B were +1.5% and -0.7% in the polyimide(PM) membrane but were increased to 3.1% and 1.6% when the CO2 partial pressure was elevated by separating and recovering nonconsuming CO2 in the cathode exhaust gas. It is necessary to improve the distribution of pore for the porous membrane and to improve the permeating rate for PM. (62 figs, 12 tabs, 2 refs).