Before the coal can be burned it needs to be processed. This usually happens at the mining site and involves the removal of dirt, rock, ash, sulfur, and other minerals and chemicals from the coal. The processing also usually increases the heating value of the coal.
after the processing of the coal, coal must be broken into sufficient small pieces ,so that maximum area is utilised as the burning surface area .so that maximum heat energy is produced .There is maximum utilisation of the coa.l
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