Carbonation Performance of NaNO3 Modified MgO Sorbents

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• 作者：Xinfang YangLifeng Zhao ; Yang Liu ; Zhenli Sun ; Yunhan Xiao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：342-350
• 全文大小：547K
• ISSN：1520-5045

文摘

NaNO₃ modified MgO sorbents have a large theoretical CO₂ capture capacity, but their practical capture performance at medium temperatures (350–400 °C) is poor for the high thermodynamic equilibrium partial pressure of CO₂ at these temperatures. The thermodynamic limitations for NaNO₃ modified MgO sorbents can be relaxed by adding alkali or alkaline earth carbonates, and the effective carbonation temperature can be shifted to the higher temperatures (350–400 °C) to satisfy the requirement of fast kinetic reactions. In this paper, the CO₂ absorption characteristics of NaNO₃ modified MgO with or without CaCO₃ are compared experimentally to verify the promoting effects of CaCO₃. Based on the CaCO₃ promoting theory, the methods of stage heating during carbonation and partial decomposition during regeneration were adopted to improve the CO₂ absorption ability of NaNO₃ modified MgO sorbents at 350 °C. Combined with the composition of fuel gas, effects of increasing CO₂ partial pressure and H₂O were tested, and they both accelerated the carbonation rates of the sorbents, which forecasted the application potential of NaNO₃ modified MgO sorbents.