Experimental and mechanistic study on chemical looping combustion of caking coal  

作　　者：Xiuli Zhang Zhengdong Gao Yongzhuo Liu Yuanhao Hou Xiaoqing Sun Qingjie Guo 

机构地区：[1]Key Laboratory of Clean Chemical Processing of Shandong Province,College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China

出　　处：《Chinese Journal of Chemical Engineering》2021年第9期89-96,共8页中国化学工程学报（英文版）

基　　金：support from the National Key Research and Development Program of China(2018YFB06050401);Key Research and Development Program of the Ningxia Hui Autonomous Region(2018BCE01002);the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2019-KF30,2019-KF33)。

摘　　要：Under high-temperature batch fluidized bed conditions and by employing juye coal as the raw material,the present study determined the effects of the bed material,temperature,OC/C ratio,steam flow and oxygen carrier cycle on the chemical looping combustion of coal.In addition,the variations taking place in the surface functional groups of coal under different reaction times were investigated,and the variations achieved by the gas released under the pyrolysis and combustion of Juye coal were analyzed.As revealed from the results,the carbon conversion ratio and rate were elevated significantly,and the volume fraction of the outlet CO_(2)remained more than 92%under the oxygen carriers.The optimized reaction conditions to achieve the chemical looping combustion of Juye coal consisted of a temperature of 900℃,an OC/C ratio of 2,as well as a steam flow rate of 0.5 g·min^(-1).When the coal was undergoing the chemical looping combustion,volatiles primarily originated from the pyrolysis of aliphatic-CH_(3)and-CH_(2),and CO and H_(2)were largely generated from the gasification of aromatic carbon.In the CLC process,H_(2)O and CO_(2)began to separate out at 270℃,CH4 and tar began to precipitate at 370℃,and the amount of CO_(2)was continuously elevated with the rise of the temperature.

关 键 词：Caking coal Chemical looping combustion Optimized reaction conditions 

分 类 号：TQ534[化学工程—煤化学工程]