Coal Beneficiation for Clean Coal Technology Dr Kalyan Sen Director Central Fuel Research Institute Dhanbad
Figure: Particle Size distribution for Indian coals PSD of Indian Non Coking Coals
Indian Coal as feed to TPS Favourable qualities : ` Huge reserve ` 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
R & M R & M National Programme STRATEGY FOR ACHIEVING COAL BASED POWER TARGET Improved Coal Quality Improved Coal Quality Mine planning Assessment Cleaning Blending Advance Technology Advance Technology ! Larger Units Larger Units ! CCT CCT
Technology Routes for beneficiation LevelScheme Methodology Ash% reducn Cleans (%) M % over ROM coal IDry benefin. Separation of stone/shale based on differential breakage potentiality 3-4>90Nil IICrushing, screening & coarse coal cleaning Coarse coal (13/30mm) washed & mixed with untreated fines; dewatering screens. < % IIICrushing, screening and total cleaning Coarser fraction washed at optimum efficiency levels: fine coal by Spiral: dewatering >10<603-4% back
Achievable yield of washed coal by different level of beneficiation Ash, % Yield of Cleans,% back
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