惰性载体支撑钙铜复合吸收剂的碳酸化性能及其动力学分析  

Analysis of Carbonation and Kinetic Performance of Inert Support-Stabilized CaO/CuO Composites

作　　者：张振民 陈健[2] 王研凯 连世文 李丰泉 王超 袁东辉 李迎春 段伦博[2] ZHANG Zhenmin;CHEN Jian;WANG Yankai;LIAN Shiwen;LI Fengquan;WANG Chao;YUAN Donghui;LI Yingchun;DUAN Lunbo(Inner Mongolia Electric Power Research Institute Branch,Inner Monglia Electric Power(Group)Co.Ltd.,Huhhot 010020,China;Key Laboratory of Energy Thermal Conversion and Control,Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,内蒙古呼和浩特010020 [2]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《石油学报（石油加工）》2020年第6期1389-1397,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点研发计划项目(2018YFB0605301)基金资助。

摘　　要：采用Pechini法分别制备了无惰性载体支撑和惰性载体(Al 2O 3或者ZrO 2)支撑的钙铜复合吸收剂。借助热重分析仪研究了反应温度、载体种类对其氧化性能和CO 2捕集性能的影响,并借助扫描电子显微镜(SEM)和氮吸附分析其微观结构。最后,利用缩核模型对惰性载体支撑和无惰性载体支撑的钙铜复合吸收剂的碳酸化反应中的动力学控制阶段开展了动力学分析。结果表明:惰性载体可以显著提升钙铜复合吸收剂的CO 2捕集性能,相比于无惰性载体支撑的钙铜复合吸收剂,Al 2O 3和ZrO 2支撑的钙铜复合吸收剂经历10次循环后,CO 2捕集量分别提升了100%和71%;添加惰性载体会降低钙铜复合吸收剂的载氧量,但并不影响其循环稳定性。随着碳酸化温度的升高,钙铜复合吸收剂的碳酸化速率和最终CO 2捕集量均显著增加。动力学结果表明,添加惰性载体不仅可以加快碳酸化反应动力学控制阶段的反应速率,延缓动力学控制阶段反应速率的衰减,同时还可以降低碳酸化反应活化能,进而对碳酸化反应起到显著的促进作用。Unstabilized and inert support(i.e.Al 2O 3 or ZrO 2)stabilized CaO/CuO composites were synthesized by the Pechini method,respectively.The effects of reaction temperatures and types of inert support on their oxidation and CO 2 capture performance were investigated via the thermogravimetric analyzer(TGA).The morphologies and microstructures were characterized by the scanning electron microscopy(SEM)and N 2 physisorption measurements.Finally,a shrinking core model was employed to describe the kinetically-controlled stage of the carbonation process for Al 2O 3-stabilized and unstabilized CaO/CuO composites,respectively.The results show that the incorporation of inert support significantly enhances the CO 2 capture performance by 100%and 71%for Al 2O 3-and ZrO 2-stabilized CaO/CuO composites,respectively,after 10 repeated cycles.Although the incorporation of inert support decreases O 2 carrying capacities,negligible effects have been found for the cyclic stability.Carbonation temperatures show an important role in the CO 2 capture performance:with the increase in carbonation temperatures,the carbonation rate and final CO 2 uptake increased simultaneously.The kinetic studies show that the incorporation of inert support enhances the reaction rate of the kinetics-controlled stage slows down the decline in reaction rate,and lower the activation energies.Overall,the inert support-stabilized CaO/CuO composites exhibit better CO 2 capture performance.

关 键 词：CO 2捕集 钙循环 化学链燃烧 复合材料 载体 动力学 

分 类 号：TK01[动力工程及工程热物理]