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Water and Energy International
Year : 2008, Volume : 65, Issue : 3
First page : ( 34) Last page : ( 44)
Print ISSN : 0974-4711.

High unburnt carbon problem in fly ash & bottom ash in some Indian stations

Mandal Pradip K.

The author has done Ph.D. from UDCT Bombay & PDF from Regional Engineering College Kurukshetra in coal combustion, recipient of national (Pt. Jawarlal Nehru Award, CBI&P, 1994 for outstanding research in power sector) & international awards (Best paper, CBI&P international conference, Vadodara) having 90 research publications & two patent in his credit.

NTPC Limited.


The formation of unburnt carbon in pulverized coal based boiler furnace is undesirable as it leads to not only huge wastage of fuel but associated with revenue loss also, which in turn increase the unit generation cost.

The formation of unburnt carbon depends on many factors viz., nature of fuel (reactivity): operational parameters (O2 level, residence time of coal particles inside the furnace, turbulence, furnace temperature profile, etc.) mill performance (coal fineness). In the present paper the high unburnt carbon formation of some Indian pulverized coal power based stations was studied to find out the causes of unburnt carbon formation. The possible remedial measures and various tips were also suggested for improvement. The case studies of all the stations are given separately.


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