Economic evaluation of facilitated transport membranes for separation of CO
2 from two kinds of flue gases, i.e., from a natural gas-fired power plant (NGFPP) and a coal-fired power plant (CFPP), was performed by computer simulation. Gel-coated liquid membranes containing aqueous solutions of a novel carrier, 2, 3-diaminopropionic acid (DAPA), were used as facilitated transport membranes. When the CO
2 recovery is 50%, the CO
2 purity of the recovered gas is 90% and the recovered gas is transported as a gas mixture for sequestration, the energy required was estimated as 8.39% of the energy generated in the case of NGFPP and 10.55% in the case of CFPP.
The CO
2 separation costs for NGCPP and CFPP were 359 yen/kmol-CO
2 and 283 yen/kmol-CO
2, respectively. When the CO
2 recovery is 50%, the CO
2 purity in the recovered gas is 99.9% and the recovered gas is transported as liquefied gas, the energy required was estimated as 11.1% of the energy generated energy in the case of NGFPP and 14.5% in the case of CFPP as 14.5%. The CO
2 separation costs from NGCPP and CFPP were 427 yen/kmol-CO
2 and 354 yen/kmol-CO
2, respectively. The CO
2 recovery system by the facilitated transport membrane has an economic advantage in operation energy and CO
2 separation cost compared to the polymer membrane system and the chemical absorption system.
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