摘要
为获得不同载体钾基吸附剂对CO2的吸附机理,对3种载体(循环流化床锅炉飞灰、活性炭和氧化铝)和3种K2CO3理论负载量(10%、30%和50%)改性条件下的吸附剂进行了研究,获得了反应温度(50、60、70、80和90℃)及CO2浓度(5%、7.5%、10%、12.5%和15%)对吸附剂CO2吸附性能的影响,同时利用比表面积及孔隙度分析仪和X射线衍射仪研究了负载和反应前后吸附剂的微观特性,结合其反应动力学过程,探明其影响机理。结果表明:3种吸附剂的最佳理论负载量为30%,且70℃的反应温度和12.5%的CO2浓度为最佳反应工况;K2CO3/AC吸附剂的实际负载量和CO2吸附性能最优,而K2CO3/Al2O3吸附剂则最差;吸附剂的碳酸化反应过程中,相比比孔容积,比表面积发挥更重要的作用;随着反应温度的升高,内扩散阻力显著增强;SO2和HCl会与K2CO3反应生成新的物质导致吸附剂逐渐失效,3种吸附剂中K2CO3/AC的循环失效性能最好。
In order to obtain the CO2 adsorption mechanism of potassium-based adsorbents with different supports,three kinds of supports(circulating fluidized bed boiler fly ash,activated carbon and activated alumina)and three K2CO3 theoretical loading(10%,30%and 50%)adsorbents were studied,and the effect of reaction temperature and CO2 concentration on the CO2 adsorption of the adsorbents after loading was obtained.At the same time,the microscopic characteristics of the adsorbents before and after loading and reaction were studied by the specific surface area and porosity analyzer and X-ray diffractometer.The reaction kinetics was combined to explore its influence mechanism.The results showed that the optimal theoretical loading was 30%,while the best reaction conditions were the reaction temperature at 70℃and concentration of CO2 at 12.5%.The actual loading capacity and CO2 adsorption performance of K2CO3/AC was the best,while the K2CO3/Al2O3 was the worst.During the carbonation reaction of the adsorbents,the specific surface area played a more important role in the adsorption process than the cumulative pore volume.The internal diffusion resistance built-up remarkably with the increase of reaction temperature.SO2 and HCl reacted with K2CO3 to produce a new substance,which leaded to the gradual failure of the adsorbents,and K2CO3/AC had the best cycle performance.
作者
王彦霖
贾里
梅雪松
刘燕燕
赵传文
金燕
WANG Yanlin;JIA Li;MEI Xuesong;LIU Yanyan;ZHAO Chuanwen;JIN Yan(College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210023,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第11期98-104,共7页
Environmental Science & Technology
基金
国家自然科学基金(U1810126,U1510129)
山西省重大科技专项(MD-2016-02-6).
关键词
钾基吸附剂
CO2吸附
微观特性
动力学
失效
锅炉飞灰
potassium-based adsorbent
CO2 adsorption
microscopic characteristics
kinetics
failure
boiler fly ash
作者简介
王彦霖(1994-),男,硕士研究生,研究方向为燃煤烟气中CO2的脱除,(电子信箱)13453122526@163.com;通讯作者:金燕,(电子信箱)jinyan@tyut.edu.cn。
