STUDY OF THE KINETICS OF THE THERMAL DECOMPOSITION PROCESS OF COAL FROM THE SARAYADYR DEPOSIT (THE “NADEZHNY” FORMATION)

Abstract

This article examines the kinetic patterns of thermal decomposition of high-ash coal from the Saryadyr deposit (Kazakhstan) using thermogravimetric analysis. The authors performed mathematical analysis of the DTG curves based on non-isothermal formal kinetic equations and the Arrhenius law. During the study, conducted in an inert nitrogen atmosphere at various heating rates (3–15 °C/min), three stages of decomposition of the coal’s organic matter (COM) were identified, for which the following effective parameters were determined: activation energy, pre-exponential factor, and rate constants. It was established that an increase in the heating rate leads to a systematic shift of the mass loss rate maxima toward higher temperatures, and the transition to the second stage of destruction is accompanied by a significant increase in the activation barrier.