Modern trend for Ash disposal in slurry form [Feb 2012]

February 10, 2012 6:27 am

During the last decade of 20th century, a very high demand for power had been forecast and the Government of India had initiated various plans to achieve the demand including addition of new major thermal power projects in India.  Major share of power from additional installed capacity of above thermal power plants was planned from coal based thermal power projects which produced huge amount of ash from low grade coal used for thermal power generation.
While utilisation of fly ash had been gathering momentum for cement manufacturing, road construction & other miscellaneous uses, however, major quantity of ash remained unused. The unused ash is disposed off in slurry form into an ash pond which is located at a distance of 1 km to 10 km or more depending upon land availability and the slurry was pumped using centrifugal pumps in concentration varying from 15 – 25 per cent which needs huge amount of water. For disposal of 100 TPH ash in lean slurry form in conventional method, water requirement would be about 300 to 400 M3 / hr while in HCSD system for disposal of same amount of ash, water requirement would be only 60 M3 /hr to 70 M3 /hr. In case of lean slurry system, the slurry generated is required to be pumped into ash pond leaving huge amount of free flowing water in ash ponds which is brought back to power plants through ash water recovery system and both these pumping consume huge amount of auxiliary power.

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