Reaction characteristics investigation of CeO_(2)-enhanced CaSO_(4) oxygen carrier with lignite  

作　　者：Baowen Wang Zhongyuan Cai Heyu Li Yanchen Liang Tao Jiang Ning Ding Haibo Zhao 

机构地区：[1]Research Institute for Coal Clean and Efficient Utilization,College of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450045,China [2]Hebei Ji-Yan Energy Science and Technology Research Institute,Shijiazhuang 050000,China [3]State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第2期319-328,共10页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Founda-tion of China(Nos.51776073,51906083);Key Research&Develop-ment program of Henan Province(No.162102210233);North China University of Water Resources and Electric Power Innovative Project(Nos.2019XA014,2019XB058);Scientific Research&Development Project of Ji-Yan Energy Science and Technology Research Institute(NKY2020-05).

摘　　要：Calcium sulfate(CaSO_(4))has been verified as a promising oxygen carrier(OC)in the chemical looping combustion(CLC)for its high oxygen capacity,abundant reserve and low cost,but its low reactivity and deleterious sulfur species emission from the side reactions of CaSO_(4) should be well considered for its wide application in CLC.In order to promote the reactivity of CaSO_(4) and increase its potential to inhibit the gaseous sulfur emission,a CeO_(2)-enhanced CaSO_(4) OC mixed OC of core–shell structure was prepared using the combined template synthesis method.Reaction characteristics of the prepared CaSO_(4)-CeO_(2) mixed OC with a typical lignite was first conducted and systematically investigated,and an improved reactivity of the prepared CaSO_(4)-CeO_(2) mixed OC was demonstrated than its single component CaSO_(4) or CeO_(2) due to the fast transfer and exchange of oxygen from the CaSO_(4) substrate to coal via the doped CeO_(2).Furthermore,the solid products formed from the mixed CaSO_(4)-CeO_(2) OC with the selected coal were collected and analyzed.Especially,evolution and redistribution of the sulfur species of different forms were focused.At the latter reaction stage of YN reaction with the CaSO_(4)-CeO_(2) mixed OC,the SO_(2) emitted from the side reactions of CaSO_(4) was greatly diminished and the doped CeO_(2) was proven effective to directionally fix the SO_(2) released to turn into different solid sulfur compounds,which were determined as Ce_(2)O_(2)S,Ce_(2)S_(3) and Ce_(2)(SO_(4))_(3)·5H_(2)O and formed through the different pathways.In addition,good regeneration of the reduced CaSO_(4)-CeO_(2) mixed OC could be reached in spite of the unavoidable interaction between the included minerals in coal and the reduced mixed OC.Overall,the combined template method-made CaSO_(4)-CeO_(2) mixed OC reported herein was not only endowed with enhanced reactivity for coal conversion,but also owned the potential to directionally fix the gaseous sulfur emission,which is quite applicable as OC for simultaneous dec

关 键 词：Coal combustion CO_(2)capture Chemical looping combustion CaSO4 mixed oxygen carrier Template combined synthesis method Sulfur evolution 

分 类 号：X701[环境科学与工程—环境工程] TQ534[化学工程—煤化学工程]