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Emerging Dimension for Utilization of Global Coal. Dr Kalyan Sen. Import of Coal. ‘ why difficult - to - wash ’. due to. typical geological formation intergrown mineral matter high NGM at desired d 50. Fractional Yield/Ash vs. Rel. Density. 30. 80. 25. 60. Characteristic ash, %.
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Emerging DimensionforUtilization of Global Coal Dr Kalyan Sen
‘whydifficult - to - wash’ due to • typical geological formation • intergrown mineral matter • high NGM at desired d50
Fractional Yield/Ash vs. Rel. Density 30 80 25 60 Characteristic ash, % 20 15 40 Yield,% 10 20 5 0 0 1.3 1.45 1.55 1.65 1.75 1.85 1.95 2.15 Mid Rel. Den
Relationship between fract. Ash% & mid. sp. gr. is one of the inherent properties of coal • universal in nature • linear, in sp. gr. range of coaly matter • co-eff. of linearity indicates the maturity hence, the name Characteristic Ash ()
Characteristicashasoptimum quality parameter forcoking coall =26-28% limitingvalue for non-coking coal l =50-55%
This is why,for metallurgical use,Western coals(av. ash% 12-16) are washed down to 8-12%,in comparison to Indian coals that need to be washed down to 17-19% ash
Similarly,for thermal power plant use,Western coalsare washed down to 12-16%,in comparison to Indian coals that need to be washed down to 30-34% ashor below
Less Matured Coal More Matured Coal
START OperationFlow Chart S/A, F/S, , p …. Density dist. RelationMaterial balanceDensity at cut-points Cal. mass - mcCal. density - dc Obs. mass - moObs. density - do Control Roominformation Yes mc = mo ? Maximum composite Yield at desired quality No Change density STOP optimizationstrategy
State-of-the-ArtIntegrated Coal Washing Pilot Plant
RawCoalSection Dry Deshaler
RawCoalSection Single Roll Crusher
RawCoalSection Double Roll Crusher
CoarseCoalPlant Jig
CoarseCoalPlant HM Drum
FineCoalSection Targetted
HONEYWELL SERVER (OPRT + PROGRAMMING TERMINAL) CONTROL SYSTEM STATION (OPERATORS TESRMINAL) CONVERTOR STN - 1 STN - 2 PRINTER SERIAL INTERFACE SINGLE & MULTILOOP CONTROLLER HUB SINGLE & MULTILOOP CONTROLLER Total support I/O nos. - 4096 P L C ( GE-Fanuc) J B GENIUS LAN J B Bin Weigher Weight Feeder I/P Converter Trans- mitters TO EXISTING PLANT LOCAL I / O SUB - SYSTEM CENTRAL CONTROL ROOM Control Valves