Study on the Mechanism and Energy Consumption of CO2 Regeneration Process by Membrane Electrolysis

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• 作者：Xinglei Zhao ; Na Liu ; Yundong Wang ; Weiyang Fei ; Geoffrey W. Stevens
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：July 20, 2011
• 年：2011
• 卷：50
• 期：14
• 页码：8620-8631
• 全文大小：1183K
• 年卷期：v.50,no.14(July 20, 2011)
• ISSN：1520-5045

文摘

A significant barrier for carbon capture and sequestration (CCS) deployment is the high capital cost and the high energy consumption for capturing CO₂ from a coal fired power station. Novel membrane electrolytic regeneration technology has been reported to significantly reduce the energy consumption compared with the conventional thermal regeneration process [Martin, F. J.; Kubic Jr., W. L. Green Freedom: A Concept for Producing Carbon-Neutral Synthetic Fuels and Chemicals; LA-UR-07-7897; Los Alamos National Laboratory, Los Alamos, NM, USA, 2007]. The mechanism and energy consumption for this novel process have been studied in this paper. CO₂ regeneration was achieved through the membrane electrolysis process, and CO₂ regeneration efficiency reached as high as 100%. At room temperature, the membrane electrolysis process is considered in three stages: no CO₂ release stage, enhanced CO₂ release stage, and steady CO₂ release stage. The mechanisms for each stage and the whole process have been presented. Compared with the traditional CCS process, the energy requirement is significantly reduced to 16.6% for the regeneration process and 25.8% for the total CO₂ capture and compression process using the electrolysis regeneration process based on ASPEN PLUS simulations. Further work on the membrane electrolytic regeneration is needed to examine the impact of promoters, the optimization of electrolysis conditions, and the equipment cost.