Studies on the Reaction Engineering of Combustion and Carbonization of Indian Coals, Depolymerized Coals and Residual Coal Obtained After Organo-Refining

Abstract

Kinetics of the combustion of original and depolymerized Assam, Raniganj and Talcher coals and Neyveli lignite has been studied under non-isothermal conditions in a thermogravimetric analysis apparatus by employing Coats and Redfern kinetic modeling. Depolymerization of coals through acidic phenoation was found to improve the reactivity of the coals for combustion. Similarly, depolymerization reaction also led to the improvement in the pyrolysis behavior of coals. The order and activation energy of the reactions have been reported. The kinetics studies of the residual coal obtained after the successive solvent extraction of coal has also been studied. The present studies on the reaction engineering of coal conversion and utilization technologies may help in the reactor design and in the process development engineering.

Keywords:

• carbonization
• coal
• combustion
• depolymerization
• organo-refining
• pyrolysis
• reaction engineering
• residual coals
• solvent extraction