Abstract
Indian thermal coals are usually high-moisture, high-ash, and high-volatile sub-bituminous type coal and are difficult to wash. Beneficiation of high-ash thermal coals of India has become the prerequisite for improving the overall economics and efficiency of power generation. The article highlights the studies carried out on the cleaning potentialities of thermal coal samples collected from three major coalfields through washability investigations followed by the identification of the level of cleaning by linking with the burning behavior. Conventional float-sink testing was used to determine the washability characteristics, and based on the washability data, clean coal was generated at three different ash levels. Combustion studies of the raw and clean coal have been conducted in a Drop Tube Furnace basically to observe the change in the burning behavior with the level of cleaning. From the combustion behavior of the washed fraction, it was found that, for two coal samples, Burnout Efficiency (BE) has improved compared to that of the raw coal, while for another sample, a reverse trend was observed. The studies concluded that it is better to fix the level of washing a particular coal based on combustion properties of the clean coal rather than taking an arbitrary value.
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