Calcium Looping for CO2 Capture at a Constant High Temperature

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• 作者：Junjun Yin ; Changlei Qin ; Bo Feng ; Lei Ge ; Cong Luo ; Wenqiang Liu ; Hui An
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：January 16, 2014
• 年：2014
• 卷：28
• 期：1
• 页码：307-318
• 全文大小：742K
• ISSN：1520-5029

文摘

A calcium looping process using calcium-oxide-based sorbent for CO₂ capture was demonstrated to operate at a constant high temperature in this work. First the operating temperature window of the process was determined by investigating the quasi-equilibrium and kinetics of carbonation/calcination of synthetic CaO-based sorbents. The results indicate that the process would be suitable to operate within 750鈥?40 掳C when the CO₂ concentration is higher than 15%. Subsequently, the process was demonstrated in a lab-scale fixed-bed reactor in 20% CO₂ (N₂ balance) by examining the temperature variations in the synthetic CaO-based sorbent particles. The effects of operating variables (such as operating temperature, switching time, and sample type) on the cyclic temperature variation were investigated. It was observed that the process operated in a highly stable manner over 100 cycles at 770 掳C with the switching time of 1 min in both carbonation and calcination modes. The cost of calcium looping could be reduced significantly by operating at a constant high temperature.