New CO2 Capture Process with Gas鈥揕iquid鈥揝olid Three-Phase Circulating Fluidized Bed

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• 作者：Kangtao Hu ; Jinghao Liu ; Hairui Yang ; Hai Zhang ; Qing Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：November 13, 2013
• 年：2013
• 卷：52
• 期：45
• 页码：15905-15911
• 全文大小：326K
• 年卷期：v.52,no.45(November 13, 2013)
• ISSN：1520-5045

文摘

The idea of applying the gas鈥搇iquid鈥搒olid (GLS) three-phase circulating fluidized bed to CO<sub>2sub> capture by aqueous ammonia is proposed in this work. A three-phase circulating fluidized bed test rig was built, and a series of experiments were carried out to study the multiphase flow and gas鈥搇iquid mass transfer behavior. Compared with the conventional reactors, the solids in the three-phase circulating fluidized bed can break up bubbles into much smaller ones and distribute them more uniformly. The experimental results show a three-phase circulating fluidized bed can provide larger interface area, longer residence time, and higher mass transfer efficiency. Based on these results, the process for CO<sub>2sub> capture by aqueous ammonia using a three-phase circulating fluidized bed was designed conceptually and its feasibility was studied preliminarily by Apsen Plus鈥攁 simulation software. When the mole fraction of aqueous ammonia is about 5.16% in the three-phase circulating fluidized bed, more than 90% of the CO<sub>2sub> can be absorbed and the ammonia escaping ratio is very small. The three-phase circulating fluidized bed presents great potential in CO<sub>2sub> separation by aqueous ammonia.