The carbon dioxide concentrator by using MCFC

The removal characteristics of CO ₂ in molten carbonate fuel cell (MCFC) were elucidated by the single cell whose electrode area was 81 cm ² and electrolyte was 52Li ₂CO ₃/48Na ₂CO ₃. The experimental value of the CO ₂ removal rate from cathode to anode was almost corresponding to the theoretical value. Cell voltage dropped drastically when concentration of CO ₂ in cathode became 15% or less. This tendency showed strikingly, as concentration of O ₂ in cathode became lower and lower. The cell performance is influenced with the p_{O 2}/ p_{CO 2} ratio of the cathode gases, because cell voltage decreases by decreasing the p_{O 2}/ p_{CO 2} ratio. Therefore, when the p_{O 2}/ p_{CO 2} ratio is as low as the thermal power plant, it is necessary to add air to cathode for improving the cell performance. Consequently, the reduction target of CO ₂ in COP3 can be achieved.