Abstract
This kinetic study focuses on determining the thermal gravimetric profile of a particular grade of Indian sub-bituminous coal. A thermogravimetric analyzer (TGA-1000) was employed to investigate the thermal behavior and extract the kinetic parameters of Jamadoba coal and its corresponding density separated macerals. The weight loss was measured in air atmosphere. The coal samples used in this study were obtained from Jamadoba mines, Jharkhand. Samples of 35 mg and 200 μm mean size were subjected to synthetic air atmospheres (21% O2). Heating rates of 2, 5 and 7°C/min were applied until the temperature reached 1400°C, which was kept constant until burnout. Low heating rate was preferred so that devolatilization occurs prior to ignition and combustion. Derivative thermogravimetry (DTG) analysis method was applied to measure the weight changes and rates of weight loss used for calculating the kinetic parameters. The activation energy (Ea) and pre-exponential factor were obtained from model-free methods by applying non-isothermal thermogravimetry analysis.
Highlights
IntroductionThe design of coal combustion process requires the know-how of the various stages of thermal degradation in order to deduce optimum operating conditions
India is one of the fastest-growing economies in the world
The main purpose of this study is to examine the chemical kinetic performance of the same rank Indian coal, together with the estimation of activation energy and pre-exponential factor and its influence over a range of vitrinite content, inertinite content and heating rate
Summary
The design of coal combustion process requires the know-how of the various stages of thermal degradation in order to deduce optimum operating conditions This greater significance on more effective utilization of coal combined with its chemical complexity raises the need for a thermogravimetry study coupled with microscopy analysis. The main advantages of thermogravimetry method for the study of coal combustion are credibility to ensure equal weightage to examination over the whole range of study and good response to any variations in kinetic parameters as a single sample is analyzed over the whole range of temperature [2] Another major advantage of the thermogravimetry method is that it can be used to investigate the devolatilization of coal in both inert and oxidizing atmospheres [3]
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