Thermodynamic analysis on post-combustion CO2 capture of natural-gas-fired power plant |
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| Authors: | Zeinab Amrollahi Ivar S. Ertesvåg Olav Bolland |
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| Affiliation: | 1. The University of Texas at Austin, McKetta Department of Chemical Engineering, 200 E Dean Keeton St. Stop C0400, Austin, TX 78712-1589, USA;2. State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China;1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, No. 28 Xianning West Road, Xi’an 710049, PR China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;3. School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;1. North China Electric Power University, China Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, Changping District, Beijing 102206, China;2. Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, W.A. 6009, Australia;1. SINTEF Energy Research, Sem Sælandsvei 11, NO-7465, Trondheim, Norway;2. SINTEF Materials and Chemistry, R. Birkelands vei 2B, NO-7465, Trondheim, Norway |
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| Abstract: | A chemical absorption, post-combustion CO2 capture unit is simulated and an exergy analysis has been conducted, including irreversibility calculations for all process units. By pinpointing major irreversibilities, new proposals for efficient energy integrated chemical absorption process are suggested. Further, a natural-gas combined-cycle power plant with a CO2 capture unit has been analyzed on an exergetic basis. By defining exergy balances and black-box models for plant units, investigation has been made to determine effect of each unit on the overall exergy efficiency. Simulation of the chemical absorption plant was done using UniSim Design software with Amines Property Package. For natural-gas combined-cycle design, GT PRO software (Thermoflow, Inc.) has been used. For exergy calculations, spreadsheets are created with Microsoft Excel by importing data from UniSim and GT PRO. Results show the exergy efficiency of 21.2% for the chemical absorption CO2 capture unit and 67% for the CO2 compression unit. The total exergy efficiency of CO2 capture and compression unit is 31.6%. |
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