碱金属掺杂对NiFeAlO 4载氧体结构及反应特性的影响  

Effects of Alkali Metal Doping on NiFeAlO4 Oxygen Carrier Structures and Its Coal Chemical Looping Combustion Performance

作　　者：魏泽华 刘道诚 王九占 荆洁颖[1] WEI Zehua;LIU Daocheng;WANG Jiuzhan;JING Jieying(Training Base of State Key Laboratory of Coal Science and Technology Jointly Constructed by Shanxi Province and Ministry of Science and Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学煤科学与技术省部共建国家重点实验室培育基地,山西太原030024

出　　处：《石油学报（石油加工）》2020年第6期1178-1188,共11页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点研发计划项目(2018YFB0605401-01)基金资助。

摘　　要：采用溶胶-凝胶法和浸渍法制备了碱金属掺杂的尖晶石结构NiFeAlO 4载氧体,考察了制备方法、碱金属种类、碱金属掺杂比例对NiFeAlO 4载氧体结构、煤化学链燃烧特性和循环稳定性的影响。结果表明,溶胶-凝胶法制备的钾掺杂NiFeAlO 4载氧体具有更好的反应性,当载氧体与煤质量比为20∶1时,掺杂质量分数为5%K 2CO 3的NiFeAlO 4载氧体与煤反应的碳转化率为99%,高于NiFeAlO 4载氧体与煤反应时的碳转化率(87%)。与NiFeAlO 4载氧体相比,掺杂质量分数为5%K 2CO 3的NiFeAlO 4载氧体呈现出更好的循环稳定性,主要归因于碱金属K的掺杂改善了载氧体的反应活性,对载氧体的团聚有抑制作用,且反应前后载氧体晶相结构保持不变。The alkali metal doped NiFeAlO 4 oxygen carrier with spinel structures were prepared via the impregnation and the sol-gel methods.The coal chemical looping combustion reaction and cycling stability of the alkali metal doped NiFeAlO 4 oxygen carrier were investigated via considering the factors of preparation methods,the alkali metal type and the alkali metal doping dosage.Results show that potassium doped NiFeAlO 4 oxygen carrier synthesized by the sol-gel method possesses superior reactivity.When the mass ratio between oxygen carrier and coal is 20∶1,99%carbon conversion has been obtained over NiFeAlO 4 oxygen carrier doped with 5%(mass fraction)K 2CO 3,which is much higher than that of the NiFeAlO 4 oxygen carrier reacting with coal(87%)。Compared with NiFeAlO 4 oxygen carrier,NiFeAlO 4 oxygen carrier doped with 5%(mass fraction)K 2CO 3 exhibited better cyclic stability.The analysis of crystal structures and morphology of NiFeAlO 4 oxygen carrier doped with 5%(mass fraction)K 2CO 3 shows that the grain agglomeration is inhibited by potassium and crystal structures remain unchanged before and after reactions.

关 键 词：化学链燃烧 NiFeAlO 4 碱金属 载氧体 CO 2 

分 类 号：TK16[动力工程及工程热物理—热能工程]