Effect of lignite properties on reactivity of lignite

The purpose of this study is to relate the combustion reactivity of lignite to its physical and chemical properties. Non-isothermal thermogravimetry, where the sample whose temperature increased at a linear rate (40 K/min) wa s heated in air, has been used to investigate the combustion reactivities o f 25 lignite samples originating from different areas of Turkey. Since comb ustion reactivity is affected by the chemical and physical properties of co al, the combustion reactivity of the lignites used in this study was relate d to their proximate and ultimate analysis results and physical properties such as pore structure and surface area. The calculated activation energy v alues for the combustion reactions of the lignites ranged between 64 and 13 9 kJ/mol. Definite correlations between the activation energy values and th e above-mentioned properties were found. (C) 2000 Elsevier Science Ltd. All rights reserved.