Coal Beneficiation for Clean Coal Technology Dr Kalyan
Coal Beneficiation for Clean Coal Technology Dr Kalyan Sen Director Central Fuel Research Institute Dhanbad 828108
PSD of Indian Non Coking Coals Figure: Particle Size distribution for Indian coals
Indian Coal as feed to TPS ` Huge reserve Favourable qualities: ` Low S content ( <0. 6%) ` High AFT (>1100 o. C) ` Low Iron content ` Low Chlorine content ` Low toxic trace elements ` Reactive inertinites back
DSC/TG of Density Fractions
Maximum Rate Vs Ch. Ash
DTG Peak Temperature Vs Ch. Ash
STRATEGY FOR ACHIEVING COAL BASED POWER TARGET Improved Coal Quality R&M • Mine planning National • Assessment Programme • Cleaning • Blending Advance Technology ! Larger Units ! CCT
Technology Routes for beneficiation Level Scheme Methodology Ash% Cleans M % over reducn (%) ROM coal I Dry benefin. Separation of stone/shale based on differential breakage potentiality 3 -4 >90 Nil II Crushing, screening & coarse coal cleaning <10 70 -90 2 -3% >10 <60 3 -4% III Crushing, screening and total cleaning Coarse coal (13/30 mm) washed & mixed with untreated fines; dewatering screens. Coarser fraction washed at optimum efficiency levels: fine coal by Spiral: dewatering back
Achievable yield of washed coal by different level of beneficiation 100 95 Yield of Cleans, % Raw coal ash 37. 0% ) HM 90 l e v 85 Le 80 l ve 75 II ) M I (H l e v Le ( I I y r a e Br t o R ) G I J Le (J IG ) 70 a ( I I r e k ve l III 65 Le 60 24 25 26 27 28 29 30 31 Ash, % 32 33 34 35 36 37 back
Thank You
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