CaSO_4载氧体-煤化学链气化过程气化剂的影响（英文）

作     者：刘永卓 贾伟华 郭庆杰 Hojung Ryu 

作者机构：College of Chemical Engineering Qingdao University of Science & TechnologyKey Laboratory of Clean Chemical Processing Engineering of Shandong Province Climate Change Technology Research Division Korea Institute of Energy Research 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2014年第22卷第Z1期

页      面：1208-1214页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the Research and Development Program of the Korea Institute of Energy Research(KIER)(B4-2431-04) the National Natural Science Foundation of China(21276129,20876079) the Natural Science Funds for Distinguished Young Scholar in Shandong Province(JQ200904) 

主　　题：Chemical looping gasification Ca SO4 oxygen carrier Reaction mechanism Syngas generation 

摘      要：The chemical looping gasification uses an oxygen carrier for solid fuel gasification by supplying insufficient lattice oxygen. The effect of gasifying medium on the coal chemical looping gasification with Ca SO4 as oxygen carrier is investigated in this paper. The thermodynamical analysis indicates that the addition of steam and CO2 into the system can reduce the reaction temperature, at which the concentration of syngas reaches its maximum value.Experimental result in thermogravimetric analyzer and a fixed-bed reactor shows that the mixture sample goes through three stages, drying stage, pyrolysis stage and chemical looping gasification stage, with the temperature for three different gaseous media. The peak fitting and isoconversional methods are used to determine the reaction mechanism of the complex reactions in the chemical looping gasification process. It demonstrates that the gasifying medium(steam or CO2) boosts the chemical looping process by reducing the activation energy in the overall reaction and gasification reactions of coal char. However, the mechanism using steam as the gasifying medium differs from that using CO2. With steam as the gasifying medium, parallel reactions occur in the beginning stage, followed by a limiting stage shifting from a kinetic to a diffusion regime. It is opposite to the reaction mechanism with CO2 as the gasifying medium.