Experiment Study on Temperature Programmed Oxidation of Spontaneous Combustion Characteristics of Weathered Coal

ZHANG Xinhai; LI Qingwei; XIAO Yang; LU Junhui

doi:10.3969/j.issn.1008-4495.2015.05.002

Abstract：In order to study the spontaneous combustion characteristics of the weathered coal, the temperature programmed experiments of weakly caking coal and 1/3 coking coal were carried out with the temperature programmed experiment table, and then the anaerobic cooling treatment of these coals was conducted by injecting N2 , this was regarded as the secondary temperature programmed of the weathered coal. By measuring O2 concentration in the process of the temperature programmed of the raw coal and weathered coal, the reaction activation energy and preexponential factor at different stages were calculated, and the variation regularity of spontaneous combustion characteristics of the weathered coal was studied. The experiment results showed that the reaction activation energy and pre-exponential factor of the weakly caking coal were lower than that of 1/3 coking coal when the temperature was below the critical temperature; the reaction activation energy and pre-exponential factor of the weakly caking coal were higher than that of 1/3 coking coal when the temperature was over the critical temperature;the reaction activation energy and pre-exponential factor of the weathered coal were clearly lower than that of the raw coal when temperature was below the dry temperature, and when the temperature was over the dry temperature, the reaction activation energy and pre-exponential factor of the weathered coal of the weakly caking coal were lower than that of the raw coal, and the reaction activation energy and pre-exponential factor of weathered coal of 1/3 coking coal were higher than that of the raw coal;the reaction activation energy and pre-exponential factor of both raw coal and weathered coal tended to increase with the temperature rise.