Thermal behavior and kinetic study on the pyrolysis of Shenfu coal by sectioning method

Abstract

According to the physical and chemical characteristics of Shenfu coal pyrolysis process, the kinetics process is divided into three parts at the temperature where the variation of mass loss rate reaches the maximum. First of all, the adsorbed gas and crystal water are removed in the low temperature range; secondly, with a large amount of coal gas and tar vapors evaporating off, coal is transformed into semi-coke in the middle temperature range; thirdly, the semi-coke is further coked with the obvious volume shrinkage in the high temperature range. And then, interfacial chemical reaction model, internal diffusion model with the constant volume of resultant and internal diffusion model with the shrinking volume of resultant are developed to describe the different ranges of pyrolysis process. The results illustrate that the experimental data are fitted well, and all the correlation coefficients (r 2) exceed 0.95. Finally, the kinetic parameters of each temperature range are obtained for the utilization of coal resource.