Investigation of non-isothermal and isothermal gasification process of coal char using different kinetic model  

作　　者：Wang Guangwei Zhang Jianliang Shao Jiugang Li Kejiang Zuo Haibin 

机构地区：[1]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing [2]State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing

出　　处：《International Journal of Mining Science and Technology》2015年第1期15-21,共7页矿业科学技术学报（英文版）

基　　金：supported by the National Science Foundation of China & Baosteel under Grant (No. 51134008);the National Key Technology R&D Program in the 12th Five year Plan of China (No. 2011BAC01B02)

摘　　要：Isothermal and non-isothermal gasification kinetics of coal char were investigated by using thermogravimetric analysis(TGA) in CO2 atmosphere, and the experimental data were interpreted with the aids of random pore model(RPM), unreacted shrinking core model(URCM) and volume model(VM). With the increase of heating rate, gasification curve moves into high temperature zone and peak rate of gasification increases; with the increase of gasification temperature, gasification rate increases and the total time of gasification is shortened. The increase of both heating rate and gasification temperature could improve gasification process of coal char. Kinetics analysis indicates that experimental data agree better with the RPM than with the other two models. The apparent activation energy of non-isothermal and isothermal gasification of coal char using RPM is 193.9 k J/mol and 212.6 k J/mol respectively, which are in accordance with reported data. Gasification process of coal char under different heating rates and different temperatures are predicted by the RPM derived in this study, and it is found that the RPM predicts the reaction process satisfactorily.Isothermal and non-isothermal gasification kinetics of coal char were investigated by using thermogravi- metric analysis （TGA） in CO2 atmosphere, and the experimental data were interpreted with the aids of random pore model （RPM）, unreacted shrinking core model （URCM） and volume model （VM）. With the increase of heating rate, gasification curve moves into high temperature zone and peak rate of gasification increases; with the increase of gasification temperature, gasification rate increases and the total time of gasification is shortened. The increase of both heating rate and gasification temperature could improve gasification process of coal char. Kinetics analysis indicates that experimental data agree better with the RPM than with the other two models. The apparent activation energy of non-isothermal and isother- mal gasification of coal char using RPM is 193.9 kJ/mol and 212.6 kJ/mol respectively, which are in accor- dance with reported data. Gasification process of coal char under different heating rates and different temperatures are predicted by the RPM derived in this study, and it is found that the RPM predicts the reaction process satisfactorily.

关 键 词：Coal charGasificationThermogravimetric analysisKinetics model 

分 类 号：TQ546[化学工程—煤化学工程] TP242[自动化与计算机技术—检测技术与自动化装置]