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OEM Update
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Ash Handling in Captive Power Plants [Feb 2012]

By February 10, 2012 6:23 am IST

Ash handling is one of the complex issue in every industry. This article focuses on the various procedures of handling ash in captive power plants
Ash generation in different industries is in different forms, and accordingly the thought is given for its disposal at different levels. Though ash is a saleable item; every type of ash is not saleable. The quality & grade of ash depend upon the fuel.
Coal ash from boilersThis comes in three categories: fine, course and gravel. Detailed study of the same is as under:
Fine AshAsh coming out of the FBC boilers is normally fine and course. These days, the pollution department has fixed the norms of emission and ash content in the flue gases. Because of this either bag filter or ESP are installed. These equipment collect fine ash, and it can be up to 200 mesh.
Course AshAsh coming out from the plenum chambers and drum bottom of FBC boilers is normally course. This contains particles of coal and has the calorific value up to 700 Kcal/kg.
Gravel AshThis ash is generated by gasifires and travelling grate stoker boilers.
HANDLING OF ASH IN BOILERSAs mentioned above, the boilers generate three types of ash. There are different ways of handling them. The procedures are being discussed below separately.

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