化工学报2013，Vol.64Issue(7)：2587-2595,9.DOI:10.3969/j.issn.0438-1157.2013.07.038
铁基复合载氧体煤化学链气化反应特性及机理
Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers
摘要
Abstract
An investigation into chemical-looping gasification (CLG) of coal with K2CO3 and NiOdecorated Fe2O3 oxygen carrier in a fluidized bed reactor,using steam as the gasification-fluidization medium,was carried out.The reactivity and regeneration of two kinds of Fe2O3 composite oxygen carriers in multi-cycles,as well as the mechanism and kinetics model of the gasification process,were presented.At 920℃,the reactivity order was as follow:Fe4A16K1 ＞ Fe4A16 ＞ Fe4A16Ni1.X-ray diffraction (XRD) images showed that the Fe4A16K1 composite oxygen carrier was completely regenerated after 6 cycle redox experiments,and potassium ferrites were formed during the calcinations process,whose structure could boost the reactivity of Fe-based oxygen carrier.Fe4A16K1 particles were excellent oxygen carriers for chemical-looping gasification of coal.Finally,the peak fitting technique was used to analyze the gasification reaction rate curve describing the reaction mechanism of coal and Fe2O3 composite oxygen carrier.It indicated that complex reactions of CLG included three stages,the reaction between Fe2O3,coal char and steam,the gasification of coal char,and the reaction of Fe3O4 to FeO.关键词
化学链气化/流化床反应器/铁基复合载氧体/动力学模型Key words
chemical-looping gasification/ fluidized bed reactor/ Fe-based composite oxygen carriers/ kinetic model分类
化学化工引用本文复制引用
程煜,刘永卓,田红景,郭庆杰..铁基复合载氧体煤化学链气化反应特性及机理[J].化工学报,2013,64(7):2587-2595,9.基金项目
国家自然科学基金项目(21276129,20876079) （21276129,20876079）
山东省杰出青年基金项目(JQ200904) （JQ200904）
supported by the National Natural Science Foundation of China (21276129,20876079). （21276129,20876079）
