镁负载CaO基吸附剂捕集CO_(2)性能及抗烧结机理  

CO_(2)capture capacity and anti-sintering mechanism of MgO supported CaO based sorbent

作　　者：孙荣岳[1] 彭超 陈宇皇 朱洪亮 SUN Rongyue;PENG Chao;CHEN Yuhuang;ZHU Hongliang(School of Energy and Power Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu,China)

机构地区：[1]南京工程学院能源与动力工程学院,江苏南京211167

出　　处：《化工进展》2021年第11期6385-6392,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51706094);江苏省大学生创新创业训练项目(202011276061Y)。

摘　　要：复合钙基吸附剂制备成本过高是限制其工业化应用的主要瓶颈问题。本文以不可溶的CaCO3和Ca(OH)_(2)作为钙源,通过燃烧合成法制备钙镁复合吸附剂,在双固定床反应器上研究了其循环捕集CO_(2)性能。结果显示:制备得到的钙镁复合吸附剂具有更发达的孔隙结构,吸附剂表面Ca和Mg分散均匀,MgO均匀分布于CaO晶粒之间,有效提高了钙镁复合吸附剂的抗烧结特性,因此钙镁复合吸附剂循环反应过程中具有高捕集CO_(2)活性。以Ca(OH)_(2)作为钙源时,燃烧合成过程中Ca和Mg均匀同时析出,分散更加均匀,有效避免了CaCO_(3)作为钙源时Mg的团聚问题,因此得到的钙镁复合吸附剂循环捕集CO_(2)性能最优。最佳的Ca/Mg摩尔比为(8∶2)~(7.5∶2.5)。本研究以不可溶钙源制备得到高活性钙镁复合吸附剂,有效控制了吸附剂成本,具有更好的工程应用前景。The costs for the synthesis of calcium based sorbents are quite high,which has severely limited their industrial application.In this article,insoluble CaCO_(3) and Ca(OH)_(2) were used as raw materials to synthesize CaO/MgO sorbents by solution combustion.The CO_(2)capture capacity of the synthesized sorbents was investigated in a double fixed-bed reactor.The results showed that the CaO/MgO sorbents presented highly porous microstructures,with MgO uniformly distributed on the surface of CaO and their anti-sintering performance was improved obviously.Therefore,the CaO/MgO sorbents showed much higher CO_(2)capture capacities.When Ca(OH)_(2) was used as calcium precursor,the Ca and Mg crystallized simultaneously during the solution combustion process and distribute more evenly on the obtained sorbent.The optimum Ca/Mg molar ratio range was(8∶2)~(7.5∶2.5).The synthetic cost is effectively controlled by using insoluble calcium precursors as raw materials and hence the produced CaO/MgO sorbent here has a better engineering application prospect.

关 键 词：CO_(2)捕集 吸附法 钙镁复合吸附剂 

分 类 号：TQ534.9[化学工程—煤化学工程]