文献类型：期刊文献

英文题名：In situ experimental and modeling study on coal char combustion for coarse particle with effect of gasification in air (O2/N2) and O2/CO2 atmospheres

作者：Shen, Zhongjie[1,2];Zhang, Liqi[3];Liang, Qinfeng[1,2];Xu, Jianliang[1,2];Lin, Kuangfei[4];Liu, Haifeng[1,2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, POB 272, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;[3]Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China;[4]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2018

卷号：233

起止页码：177

外文期刊名：FUEL

收录：;EI(收录号：20182505353443);WOS:【SCI-EXPANDED(收录号:WOS:000441893200019)】；

基金：This study was supported by the National Natural Science Foundation of China (U1402272), the Fundamental Research Funds of the Central Universities (222201817004) and the Fundamental Research Funds of the Central Universities (222201814052).

语种：英文

外文关键词：Coal; Char combustion; O-2/CO2 atmosphere; CO2 gasification; Reaction front model

摘要：This study applied the high temperature stage microscope to investigate coal char combustion in air (O-2/N-2) and O-2/CO2 (volume, 21%/79%) atmospheres with the effect of gasification. A reaction front combustion model was also proposed, coupled with effect of char gasification, to predict the key parameters of char combustion in the O-2/CO2 atmospheres. The combustion process and particle evolution of coarse chars were observed and measured to calculate the carbon conversion. Experimental results showed that the burnout time of the char particle in the O-2/CO2 atmosphere in the was prolonged about 20-25%, compared to the burnout time of chars in air. The overall reaction rates of char particles in the O-2/CO2 atmosphere were lower than the rates in the air for different particle sizes. In addition, reaction rates from model prediction showed good agreements with the experimental data for different particle sizes both in the air and O-2/CO2 atmospheres, which proved the reaction front combustion model was applicable for the char combustion in this study. The reaction front combustion model also predicted that the reaction front decreased with burning time and mass consumption of char particle. For the char combustion in the O-2/CO2 atmosphere, the gasification with CO2 absorbed part of the combustion heat or radiation heat and caused lower particle temperatures and heat fluxes for different particle sizes. The proposed combustion model also predicted that although the effect of the gasification reaction was dominant at the beginning of combustion and then reduced, the conversion of particles was hindered compared to the combustion of char in air.