Effect of Sulfation during Oxy-Fuel Calcination Stage in Calcium Looping on CO2 Capture Performance of CaO-Based Sorbents

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• 作者：Cong Luo ; Ying Zheng ; Junjun Yin ; Changlei Qin ; Ning Ding ; Chuguang Zheng ; Bo Feng
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：February 21, 2013
• 年：2013
• 卷：27
• 期：2
• 页码：1008-1014
• 全文大小：517K
• 年卷期：v.27,no.2(February 21, 2013)
• ISSN：1520-5029

文摘

Sulfation of calcium-based sorbent is bound to occur during carbonation or calcination of the sorbent in a calcium looping system if SO₂ is present in the system, and it will influence the CO₂ capture capacity of the sorbent. While the effect of sulfation during the carbonation stage on the CO₂ capture capacity has been studied by some researchers, the effect of sulfation during the calcination stage has not been studied extensively. In this study, the effect of sulfation during the calcination stage under oxy-fuel combustion conditions on the CO₂ capture capacity of two calcium-based sorbents was investigated. The results showed that the calcination temperature and O₂ concentration of 5鈥?0% had little effect on the sulfation of the sorbents, while SO₂ concentration and the presence of H₂O greatly influenced the cyclic performance of the sorbents. Furthermore, reducing calcination time seems to be an effective way to limit sulfation during calcination, because the sulfation rate is slow in the initial induction stage of the gas鈥搒olid reaction.