部分气化煤焦燃烧动力学的活化能分布模型研究  

Study on Combustion Kinetics of Partial Gasified Coal Char by Using Distributed Activation Energy Model

作　　者：向银花[1] 王洋[2] 张建民[2] 黄戒介[2] 吴晋沪[2] 

机构地区：[1]中国科学院广州能源研究所,广州510070 [2]中国科学院山西煤炭化学研究所,太原030001

出　　处：《燃烧科学与技术》2003年第6期566-570,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目(G1999022105).

摘　　要：运用两段DAEM模型分析了部分气化煤焦的燃烧动力学.结果表明,两段DAEM模型能准确地描述部分气化煤焦的燃烧行为.这是因为部分气化煤焦随着气化率的增加,其燃烧曲线的二次峰越来越显著,而两段DAEM模型正好从理论上考虑了部分气化煤焦燃烧曲线的二次峰特性.同时由两段DAEM模型计算结果发现,随着3种煤焦气化率的增加,其活化能与指前因子增加,代表易反应物质量m的减小,这说明了实验与理论结果一致,随着气化反应的进行,难反应物质的比例增加.The combustion kinetics of partial gasified coal char was studied by two-stage distributed activation energy model (ts-DAEM).It is found that there are two peaks on the differential thermogravimetric(DTG)curve of partial gasified coal char combustion.According to the ts-DAEM, the coal char should be treated as two parts:one part has higher reactivity and the other has lower,which will make two peaks on the DTG curve of combustion .So the ts-DAEM model can suitably describe the combustion of partial gasified coal char.The activation energy and preexponential factor increase but the value of m decreases with the increase of coal char gasification conversion.This indicated that the difficultly reactive part in the partial gasified coal char becomes more and more with the gasification conversion.

关 键 词：部分气化煤焦 燃烧动力学 两段活化能分布模型 

分 类 号：TQ53[化学工程—煤化学工程]