Steam flow X (Steam enthalpy in kcal/kg-Feed water enthalpy in kcal/kg) / Power generationī-Heat rate of Co-ge n plant T urbine in kcal/kg = Mg (kg/sec)= Density of gas (kg/m3) X Area of Chimney (m2) X Velocity of flue gas in Chimney (m/sec)Ī-Heat rate of Thermal power plant Turbine in kcal/kw = Ta = Absolute atmospheric temperature in Kelvinģ7- Calculation of mass of flue gas flowing through chimney Ma = Mass of air & Mass of flue gas = Ma+1 Steam cost per ton = Steam enthalpy in kcal/kg X Fuel price per ton/ (Boiler efficiency % X GCV of fuel used in kcal/kg)ģ2- Travelling grate Boiler heating surface calculationīoiler heating surface (Appx) = Boiler capacity in kg/hr / 18ģ3- AFBC Boiler heating surface calculationīoiler heating surface (Appx) = Boiler capacity in kg/hr / 22ģ4- Travelling grate slop fired Boiler heating surface calculationīoiler heating surface (Appx) = Boiler capacity in kg/hr / 12ģ5- AFBC slop fired Boiler (Low pressure up to 10 kg/cm2 WP) heating surface calculationīoiler heating surface (Appx) = Boiler capacity in kg/hr / 8.2ģ6- Calculation of draught produced in Chimney ΗAPHg = (Flue gas inlet temp.-Flue gas outlet temp) X 100 / (Flue gas inlet temperature -Air inlet temperature )
ΗAPHa = (Air outlet temp-Air inlet temp)) X 100 / (Flue gas inlet temperature -Air inlet temperature) = (Economiser outlet feed water temperature-Economizer inlet feed water temperature ) X 100 / (Economizer inlet flue gas temperature - Economizer inlet feed water temperature) H1 = Enthalpy of steam before desuper heating in kcal/kg Ts = Saturated temperature of steam in deg CĪsh generation in TPH = Fuel consumption per hour X % of ash in fuel / 100įly ash generation in TPH = Fuel consumption per hour X % of ash in fuel X 80% / 100īottom ash generation in TPH = Fuel consumption per hour X % of ash in fuel X 20% / 100Īsh generation in ESP in TPH = Fuel consumption per hour X % of ash in fuel X 80% X 80% / 100Ģ7-Boiler safety valve blow down calculationīlow down % = (Set pressure - Re seat pressure) X 100 / Set pressureĢ8-Calculation of attemperator water flowĪttemperator water flow in TPH= Steam flow in TPH X (h1-h2) / (h2-h3) Tsup= Superheated steam temperature in deg C X = Mass of dry steam / (Mass of dry steam + Mass of water suspension in mixture)Ĭps = Specific heat of super heated steam
Heat required in kcal=M air X Cp X (T2-T1)Ĭp = Specific heat of flue gas in kcal/kg (0.24 kcal/kg) T1 = Initial temperature of water in deg Cġ5- Calculation of heat required to raise air temperature H2 = Sensible heat of steam at low pressure in kcal/kgġ4- Calculation of amount of heat required to raise the water temperatureĬp = Specific heat of water in kcal/kg (1 kcal/kg) Where, H1 = Sensible heat at high pressure condensate in kcal/kg Steam flow in m3/sec = (Steam flow in kg/hr / Density of steam X 3600) Velocity of steam in pipe line,V = Steam flow in m3/sec / Area of pipe line (A) Heat loss = AAS X humidity X Cp X (Tf-Ta) X 100/ (GCV of fuel)īlow down % = (Feed water TDS X % of makeup water) X 100 / (Maximum permissible TDS in Boiler water –Feed water TDS) Heat loss = M X (584 + Cp X (Tf-Ta)) X 100 / GCV of fuelĬp = Specific heat of flue gas in kcal/kgġ0- % of heat loss due to moisture in air Heat loss = Mfg X Cp X (Tf-Ta) X 100 / GCV of fuelĬp = Specific heat of flue gas in kacl/kg Mfg =(Carbon % in fuel X Molecular weight of CO2 / Mol.weight of Carbon) + N2 in fuel + (Mass of actual air supplied X % of N2 in air i.e 77/100) + ((Mass of actual air – Mass of theoretical air) X 23/100) + S2 in fuel X Mol.weight of SO2 / Mol.weight of sulphur) Mfg = Mass of Co2 in flue gas + Mass of Nitrogen in fuel + Mass of Nitrogen in combustion air + Mass of oxygen in flue gas + Mass of So2 in flue gas Where O2 = % of oxygen present in flue gas Boiler eff iciency = (Mass of steam flow X Steam enthalpy-Feed water flow at economizer inlet X Enthalpy-Attemperator water flow X Enthalpy) / (GCV of fuel X Fuel consumption)ģ- Theoretical air requirement for combustion
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