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  • Maximum level of pulverization in popular Bowl & Roller coal mills(XRP-880,XRP-630) is 70 mesh size. This invariably results in unburnt in slag ash & sometimes in fly ash also which is efficiency loss. Why coal is not pulverized in fine powder form to avoid loss due to unburnt ?
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  • TinaT

    Member • Sep 6, 2011

    There is a trade off in the auxiliary power required to pulverize the coal.

    Coal which is crushed finer will, in most cases, burn better (depending on the boiler design) - but if you put 10 MW of power into crushing the coal to get 8 MW of additional power from the generator... your net gain was -2MW (i.e. it was a LOSS).
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  • akpower

    Member • Sep 16, 2011

    Thanks Tina .It is an accepted fact that auxiliary consumption in a power plant is 10% or less having turbo feed pumps.In no case the power required for pulverization will be more than output of generator. Loss due to unburnt will be much more than additional power for pulverization. However I have not seen designers going in for fine coal pulverization. Only designers can explain .
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  • Ramani Aswath

    Member • Sep 16, 2011

    akpower
    Thanks Tina .It is an accepted fact that auxiliary consumption in a power plant is 10% or less having turbo feed pumps.In no case the power required for pulverization will be more than output of generator. Loss due to unburnt will be much more than additional power for pulverization. However I have not seen designers going in for fine coal pulverization. Only designers can explain .
    Please have a look at this PPT from IIT Delhi: (You have to paste the id)

    web.iitd.ac.in/~pmvs/jgl710/jgl710-23.ppt

    This is another:
    #-Link-Snipped-#
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  • Devil26

    Member • Dec 22, 2011

    perhaps handling finer coal becomes difficult!!!
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