Thermodynamic and economic evaluation of a CO2 membrane separation unit integrated into a supercritical coal-fired heat and power plant

Anna Skorek-Osikowska, Łukasz Bartela, Janusz Kotowicz


This paper presents the results of thermodynamic and economic analysis of a coal-fired combined heat and power plant (CHP) working at supercritical parameters, integrated with carbon dioxide capture installation based on membrane separation. Two configurations of the membrane systems are described, compared and optimized. Both of them consists of two-stage membrane installation, but in first variant (Case 1) no recirculation is performed and in the second one (Case 2), retentate from behind the second membrane is recirculated before first membrane. Economic analyses includes comparison of the systems with a unit working without CO2 capture (reference unit). Main thermodynamic (annual generation of the products, efficiencies) and economic (break-even price of electricity, break-even price of membranes) indices are presented in this paper. The results show, that the profitability of the investment in CHP units integrated with CO2 capture is strongly dependant on the annual operation time and price of emission allowances. Better thermodynamic and economic characteristics are obtained for the system with retentate recirculation than for the system without recirculation. 


membrane CO2 separation; combined heat and power plant; thermodynamic and economic analysis

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