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air preheater air supply amount atomisation bricks burning calorific value cals/kg capacity cetane chimney clinker coal coal storage coke combustion chamber condensate cost damper depends device diesel oil draught economical electrical engine exceed excess air factors feed water flame flash point flue gas flue gas temperature fuel bed fuel consumption fuel economy fuel efficiency fuel oil fuel saving furnace oil gases glass Grade heat pipe heat transfer heat treatment heater heating surface high temperature higher hour illustrated in figure India industries installed insulation kiln lagging liquid fuel load material measuring melting metre oil fired operation overall thermal efficiency Oxygen petroleum preheating pump quantity refractory sensible heat sensible heat loss solid fuel specific gravity steam stoker suitable sulphur tank thermal conductivity thermal efficiency thermal insulation thickness tion tonnes total energy system traps upto utilisation valve various viscosity waste heat recovery yard