纳米复合钙基高温CO_2吸收剂的合成与性能  

Synthesis and Performance of a Nano Synthetic Ca-based Sorbent for High Temperature CO_2 Capture

作　　者：罗聪[1] 郑瑛[1] 丁宁[1] 吴琪珑[1] 郑楚光[1] 

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2011年第8期45-50,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展规划项目(2006CB705807;2011CB707301);国家自然科学基金项目(50936001;507210058)~~

摘　　要：钙基高温碳化/煅烧循环的燃后CO2分离技术已经被证明为燃煤电厂尾气CO2捕捉最有吸引力的方式之一。但是,随着循环反应次数的增加,再生的CaO的捕捉效率迅速降低。为了提高多次循环后CaO的碳化效率。文中采用了溶胶凝胶燃烧合成法制备了纳米复合CaO/MgO吸收剂,其中CaO与MgO的摩尔比为10:1。研究结果表明,采用该方法所制备的钙基吸收剂微观结构蓬松,更有利于增强吸收剂在高温碳酸化过程中的CO2吸附能力。新型复合吸收剂虽然MgO的掺杂量较小,但是仍然具有良好的循环反应性能,孔隙结构在碳化/煅烧过程中相对保持稳定。在30次碳化/煅烧循环后,其碳化效率达到66%,远高于普通分析纯CaO吸收剂。The post-combustion Ca-based high temperature carbonation/calcination cycle has been identified to be an attractive method for CO2 capture from flue gas of coal combustion. However, it is proved that the capture ability of regenerative CaO sharply decreases with increasing carbonation/calcination cycles. In order to improve the carbonation conversion of CaO after multiple cycles, a nano synthetic CaO/MgO sorbent was synthesized by sol-gel- combustion-synthesis method, and the mole ratio of CaO to MgO was 10：1. The experimental results indicated that a hollow microstructure was formed during this preparation process for the Ca-based sorbent and it was beneficial for the sorbent to enhance its CO2 capture ability during high temperature carbonation process. Although the additive weight ratio of MgO was small, the novel synthetic sorbent still had a good cyclic performance and its pore structure kept comparative stable during carbonation/calcination reactions. After 30 carbonation/ calcination cycles, the carbonation conversion of it achieved 66% which was much higher than normal analytical pure CaO sorbent.

关 键 词：CO2 CAO MGO 碳化效率 溶胶凝胶燃烧合成法 

分 类 号：TQ132[化学工程—无机化工]