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SHORT NOTES ON COAL WASHERIES

COAL WASHERY

Coal Washing is a process of enrichment of combustibles in coal by removal of non-combustible impurities utilizing industrial separators mainly based on difference in Specific Gravity of Coal and associated impurities like Shale, Sand & Stones etc. so that we get marketable coal suitable for the target consumers.

Or we can also say Coal washing or beneficiation is a process of mechanical separation of impurities (ash) from coal, making it suitable for particular use. During beneficiation of raw coal, four products viz. washed coal, Middling/washed power coal, fines/slurry and rejects are produced based on the technology employed for beneficiation.


The Washed Coking Coal is meant for Steel Plants. The Washed Power Coal/Washed Non- Coking Coal/ Middlings is dispatched to various Power Houses.

"Economic & Environmental Impact of Coal Washing in India" are summarized below:

- The coal beneficiation process results in GCV improvement of coal which in turn leads to reduction of coal requirement to generate same quantum of electricity as well as savings in coal transportation cost. The benefit due to washed coal transportation will increase with increasing distance between the generating station and loading point at washeries.

- Coal washing yields operational benefits to power stations in terms of better flame stability, reduced operation and maintenance cost, less handling cost of ash, less environmental pollution, increase in PLF, improved life of boiler auxiliaries such as burners and mills, etc.

- Use of washed coal leads to better utilization of capacity of railway wagons and rail transportation network, environmental benefits in transportation of beneficiated coal with less ash content from the washery to power plant are other intended benefits.



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