Study on gasification kinetics of char-CO2 reaction by iso-conversional method
Zeng Mei
Zhao Meng
Xu Hongdong
Zheng Yalan
Zhang Yu
He Genliang
Men Changgui
Abstract：In order to obtain the reliable kinetics parameters of char-CO2 gasification,the kinetics were evaluated by Flunm-Wall-Ozawa (FWO) iso-conversional method.A series of gasification experiments were carried out at three different heating rates of TG.The reaction activation energy were calculated under different carbon conversion ratio,the gasification mechanism was analyzed by using principal curve,and the data obtained from the iso-conversional method were examined by fitting method.Results show that the variation of the gasification activation energy present little change ((228.25 +5.22) kJ/mol) at different carbon conversion rate (α ranges from 0.2 to 0.8).This paper suggestes that char-CO2 gasification process is homogeneous model,and the experimental curves are close to the model curve.The model is satisfying with the kinetics model commonly used in coal gasification.The difference of the gasification activation energy between fitting method and iso-conversional method is 0.74 kJ/mol,therefore,the iso-conversional method is feasible for kinetics study of char-CO2 gasification.
Keywords：iso-conversional methodchargasificationkineticsthermogravimetric
Publication Date：2017-01-01