A Preliminary High-Pressure Thermogravimetric Study of Combustion Reactivity of a Collie Coal Char
The effect of pressure (up to 20 bar) on the reactivity of a char (150-160 urn) produced from Western Australian Collie coal has been studied using a high-pressure thermogravimetric analyser (HP TGA).The pressure demonstrated a positive effect in enhancing char combustion reactivities.Kinetic parameters have been determined from the experimental data.The apparent reaction order was found to be approximately 0.7 and the apparent activation energies were 91.0 KJ/mol at atmospheric pressure and 1.5 KJ/mol at an elevated pressure (10 bar),indicating a shift in the control regimes of the reaction at elevated pressures.The lumped effect of the sample size,bulk diffusion,interparticle and intraparticle diffusion at the elevated pressures played an important role in reducing the mass transfer during the HP-TGA experimentation.Thus the activation energy calculated at elevated pressures may not represent the intrinsic activation energy of the char particles but the apparent values of the bulk of the samples.
Coal char Combustion Kinetics Pressure effect Reactivity TGA
Yii Leng Chan Zhezi Zhang Mingming Zhu Chao Luan Changfu You Dongke Zhang
Centre for Energy (M473),The University of Western Australia,Crawley,WA 6009,Australia Centre for Energy (M473),The University of Western Australia,Crawley,WA 6009,Australia Institute of Institute of Thermal Engineering,Tsinghua University,Beijing 100084,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
99-102
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）