Kane KM9106 Operator's Manual

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Kane KM9106 Operator's Manual Manual pdf 66 page image

KM9106 Operators Manual 63C. COMBUSTION EFFICIENCY CALCULATIONThe efficiency calculation is based upon British Standard BS845.This identifies three sources of loss associated with fuel burning:Losses due to flue gasses: Dry Flue gas loss,Moisture and hydrogenSensible heat of water vapourUnburned gasLosses due to refuse: Combustible in ashCombustible in riddlingsCombustible in dustOther losses: radiationconvectionconductionother unmeasured lossesNet efficiency calculations assume that the energy contained in the water vapour(formed as a product of combustion and from wet fuel) is recovered and the wet lossterm is zero. Gross efficiency calculations assume that the energy contained in thewater vapour is not recovered.Since the fuel air mixture is never consistent there is the possibility ofunburned/partially unburned fuel passing through the flue. This is represented by theunburned carbon loss.Losses due to combustible matter in ashes, riddlings, dust and grit, radiation,convection and conduction are not included.Efficiency Calculation:Known Data - Fuel: Qgr = Gross Calorific Value (kJ/kg)Qnet = Net Calorific Value (kJ/kg)K1 = Constant based on Gross or Net Calorific Value:K1g = ( 255 x %Carbon in fuel )/QgrK1n = ( 255 x %Carbon in fuel )/QnetK2 = % max theoretical CO2 (dry basis)K3 = % Wet LossMeasured Data: Tf = Flue TemperatureTi = Inlet TemperatureO2 m = % Oxygen in flue gas

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