Combustion-assisted CO₂ capture using MECC membranes

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• 作者：Steven R. Sherman^a ; ^{shermansr@ornl.gov} ; Joshua R. Gray^b ; ^{joshua.gray@srnl.doe.gov} ; Kyle S. Brinkman^b ; ^{kyle.brinkman@srnl.doe.gov} ; Kevin Huang^c ; ^{huang46@cec.sc.edu}
• 关键词：Power plant ; Flue gas ; CO2 capture ; Membrane ; Mixed Electron Carbonate Conductor
• 刊名：Journal of Membrane Science
• 出版年：2012
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：15 May, 2012
• 卷：401-402
• 期：Complete
• 页码：323-332
• 文件大小：599 K

摘要

Mixed Electron and Carbonate ion Conductor (MECC) membranes have been proposed as a means to separate CO₂ from power plant flue gas. Here a modified MECC CO₂ capture process is analyzed that supplements retentate pressurization and permeate evacuation as a means to create a CO₂ driving force with a process assisted by the catalytic combustion of syngas on the permeate side of the membrane. The combustion reactions consume transported oxygen, making it unavailable for the backwards transport reaction. With this change, the MECC capture system becomes exothermic, and steam for electricity production may be generated from the waste heat. Greater than 90%of the CO₂ in the flue gas may be captured, and a compressed CO₂ product stream is produced. A fossil-fueled power plant using this process would consume 12%more fuel per unit electricity produced than a power plant with no CO₂ capture system, and has the potential to meet U.S. DOE's goal that deployment of a CO₂ capture system at a fossil-fueled power plant should not increase the cost of electricity from the combined facility by more than 30%.