Spontaneous heating liability of some washed coal

Abstract

65% of India’s energy requirement is met by coal. Out of the total resources of coal,85% is of the non-coking variety and is of inferior quality. The ash is delivered to major customers like power houses is averaging about 42%,since,75% of the total coal produced in India is from opencast mines, and this also adds to the problem of inconsistency in the quality of coal. Coal beneficiation or coal washing is a generic term which is used to designate the various operations on the ROM (Run of Mine) coal to prepare it for specific end uses without destroying the physical characteristics of coal.it has reached a stature of vital link between production and marketing of coal.Coal preparation covers a vast range of coal processes from crushing the coal to elaborate gravity separation. Most of the processes impact the coal quality. Rotary breakers can remove out large rocks and debris from raw coal. Different experiments were conducted to find the spontaneous heating susceptibility between the raw coal and washed coal. How a washed coal is different from the raw coal why it is used in the power generation sector, cement factory and sponge factory. The project deals with determination of spontaneous heating susceptibility of washed coal as well as raw samples by experimental techniques. The intrinsic properties and susceptibility indices of the coal samples were determined by following experimental techniques Proximate analysis Calorific value Flammability temperature Wet oxidation potential Crossing point temperature Washability Characteristic Differential thermal analysis (DTA-TG)