Two-Stage VPSA Process for CO2 Capture from Flue Gas Using Activated Carbon Beads

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• 作者：Chunzhi Shen ; Zhen Liu ; Ping Li ; Jianguo Yu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：April 4, 2012
• 年：2012
• 卷：51
• 期：13
• 页码：5011-5021
• 全文大小：418K
• 年卷期：v.51,no.13(April 4, 2012)
• ISSN：1520-5045

文摘

Carbon dioxide removal from flue gas with a two-stage vacuum pressure swing adsorption (VPSA) process, which uses activated carbon (AC) beads as the adsorbent, was investigated both theoretically and experimentally. First, single-column VPSA experiments were studied for CO₂/N₂ separation with high CO₂ feed concentration. Then, a two-stage VPSA process composed two columns for each stage was designed, and the effects of different parameters were investigated. The first-stage VPSA unit operates with a four-step Skarstrom cycle, which includes feed pressurization, adsorption, blowdown, and counter-current purge with N₂. For the second-stage VPSA process, a cycle with feed pressurization, adsorption, pressure equalization, blowdown and pressure equalization was employed. With the proposed two-stage VPSA process, a CO₂ purity of 95.3% was obtained with 74.4% recovery. The total specific power consumption of the two-stage VPSA process is 723.6 kJ/kg-CO_2, while the unit productivity is 0.85 mol-CO₂/kg路h.