文献类型：期刊文献

英文题名：Experimental and kinetic studies of coal-CO2 gasification in isothermal and pressurized conditions

作者：Liu, Lang Cao, Yan Liu, Qingcai Yang, Jian

第一作者：Liu, Lang;刘浪

通信作者：Liu, L[1];Liu, L[2];Cao, Y[2]

机构：[1]Guizhou Inst Technol, Inst Chem Engn, Guiyang 550003, Guizhou, Peoples R China;[2]Western Kentucky Univ, Dept Chem, Inst Combust Sci & Environm Technol, Bowling Green, KY 42101 USA;[3]Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Guizhou Inst Technol, Inst Chem Engn, Guiyang 550003, Guizhou, Peoples R China;corresponding author), Western Kentucky Univ, Dept Chem, Inst Combust Sci & Environm Technol, Bowling Green, KY 42101 USA.|贵州理工学院化学工程学院;贵州理工学院;

年份：2017

卷号：7

期号：4

起止页码：2193-2201

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20170303263046);Scopus(收录号：2-s2.0-85009483665);WOS:【SCI-EXPANDED(收录号:WOS:000393748000052)】；

基金：This study was supported by the U.S. Department of Agriculture (5040-12630-005-00D), the 2014-2016 NSF RSP&RSP EPSCoR program (the National Science Foundation under Cooperative Agreement No. 1355438), and the support from the Science and Technology Foundation of Guizhou Province (No. qian ke he J zi [2015]2059) and the NSF-CHE-MRI under the Award ID of 1338072.

语种：英文

外文关键词：Activation energy - Carbon - Carbon dioxide - Gasification - Kinetic theory - Kinetics - Thermogravimetric analysis

摘要：This study is to explicate the reaction mechanisms and kinetics of high-pressure char CO2 gasification via a joint experimental and model simulation approach. The high-pressure char-CO2 gasification reactions were studied experimentally using a high pressure thermo-gravimetric analyzer (HP-TGA). The results showed that the char CO2 gasification rate experienced an initially slow increase until the carbon conversion reached 0.6 (Zone I), when a rapid increase in the carbon conversion increased to 0.9 (Zone II). Further gasification reaction, corresponding to a carbon conversion efficiency above 0.9 (Zone III), finally, presented a sharp decrease in kinetics. For more accurate interpretation of the experimental char-CO2-gasification kinetics and mechanisms, we found a proven kinetic model could be derived based on the random pore model and mixed model, which specifically predicate the studied gasification reaction and its critical kinetics parameters of the Zone I and II, respectively. The developed kinetics model, assembling major parameters (including char structures, pressure order, reaction order, activation energy and pre-exponential factor) was found to be in good agreement with the experimental results, covering wide realistic gasification operation conditions. This study revealed an optimal carbon conversion range with rational gasification kinetics, which can be estimated based on an accurate kinetics model.