TITLE:
Thermal Decomposition Behavior and Kinetic Study of Jamadoba Coal and Its Density Separated Macerals: A Non-Isothermal Approach
AUTHORS:
Deepak Chandra Sau, Amit Banerjee, Sanchita Chakravarty, Pragyan Senapati, Rabiranjan Murmu, Harekrushna Sutar
KEYWORDS:
Thermal Decomposition, Kinetic Study, Jamadoba Coal, Non-Isothermal
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.11 No.3,
June
1,
2021
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.