Techno-Economic Assessment of Polymer Membrane Systems for Postcombustion Carbon Capture at Coal-Fired Power Plants

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• 作者：Haibo Zhai ; Edward S. Rubin
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：March 19, 2013
• 年：2013
• 卷：47
• 期：6
• 页码：3006-3014
• 全文大小：461K
• 年卷期：v.47,no.6(March 19, 2013)
• ISSN：1520-5851

文摘

This study investigates the feasibility of polymer membrane systems for postcombustion carbon dioxide (CO<sub>2sub>) capture at coal-fired power plants. Using newly developed performance and cost models, our analysis shows that membrane systems configured with multiple stages or steps are capable of meeting capture targets of 90% CO<sub>2sub> removal efficiency and 95+% product purity. A combined driving force design using both compressors and vacuum pumps is most effective for reducing the cost of CO<sub>2sub> avoided. Further reductions in the overall system energy penalty and cost can be obtained by recycling a portion of CO<sub>2sub> via a two-stage, two-step membrane configuration with air sweep to increase the CO<sub>2sub> partial pressure of feed flue gas. For a typical plant with carbon capture and storage, this yielded a 15% lower cost per metric ton of CO<sub>2sub> avoided compared to a plant using a current amine-based capture system. A series of parametric analyses also is undertaken to identify paths for enhancing the viability of membrane-based capture technology.