pH值对溶胶-凝胶燃烧法制备CaO/MgO吸收剂反应性能的影响  

Effect of pH Value on Reaction Property of CaO/MgO Sorbent Prepared by Sol-Gel Combustion Method

作　　者：吴琪珑[1] 罗聪[1] 郑瑛[1] 丁宁[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《动力工程学报》2012年第2期147-151,共5页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB707301);教育部留学回国人员科研启动基金资助项目

摘　　要：针对多循环反应过程中钙基吸收剂的CO2吸收能力随循环次数增加而迅速衰减的问题,采用溶胶-凝胶燃烧法,在不同前驱体溶液pH值条件下制备CaO/MgO吸收剂,并在卧式固定床反应器上进行了20次循环的煅烧/碳化试验,对其吸收CO2的活性及循环反应稳定性进行了研究.结果表明:采用溶胶-凝胶法合成的CaO/MgO吸收剂与干物理混合法及湿化学法合成的相比,具有更好的CO2吸收性能;对于采用尿素溶胶-凝胶燃烧法合成的CaO/MgO吸收剂,前驱体溶液pH值越小,制备的CaO/MgO吸收剂颗粒越小,比表面积越大,CO2吸收能力越高.Aiming at the problem that the capture capacity of CaO-based absorbent reduces rapidly after multiple cycles,a number of CaO/MgO sorbents were synthesized using sol-gel combustion method under various pH conditions of precursor,of which the activity and stability in cyclic reaction of CO2 capture were investigated by 20 cycles of carbonation/calcination reaction experiment in a fixed bed reactor.Results show that the capture capability of CaO/MgO sorbent prepared by sol-gel combustion method is stronger than that prepared by dry physical mixing and wet chemical synthesis method.For CaO/MgO sorbents prepared by urea sol-gel combustion method,the less the pH value of precursor,the smaller the particle size and the larger the specific surface urea is,the stronger the absorbing capability will be.

关 键 词：CO2捕集 钙基吸收剂 溶胶-凝胶燃烧法 PH值 吸收性能 

分 类 号：X511[环境科学与工程—环境工程]