Carbonation Condition and Modeling Studies of Calcium-Based Sorbent in the Fixed-Bed Reactor

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• 作者：Shengping Wang ; Shasha Fan ; Yujun Zhao ; Lijing Fan ; Shuyao Liu ; Xinbin Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：June 25, 2014
• 年：2014
• 卷：53
• 期：25
• 页码：10457-10464
• 全文大小：471K
• ISSN：1520-5045

文摘

Carbonation process of calcium-based sorbent, as a promising technique for CO₂ capture, was examined in a fixed-bed reactor. A method was established to calculate the exact adsorption capacity using CO₂ Non-Dispersive Infrared Radiation (NDIR) analyzer as the analytical unit. The factors affecting the carbonation process of calcium-based sorbent were investigated thoroughly. The conversion and adsorption capacity of sorbent reached 65% and 41%, respectively, when CO₂ partial pressure was 0.01 MPa at 600 掳C, exhibiting an obvious advantage in terms of a relatively low carbonation temperature. The results showed a first-order reaction with respect to CO₂ partial pressure. Increasing carbonation pressure was an effective method to improve adsorption capacity, and conversion and adsorption capacity of sorbent achieved 85% and 53% at 1.3 MPa, respectively. The existence of water was beneficial to the carbonation process and the influence can be explained by the process of water hydration of CaO. The Random Pore Model (RPM) was applied to describe the carbonation process in the reaction-controlled stage and the predicted data obtained from the model showed good accordance with the experimental results.