I will give you an example, so you can take this as reference and calculate fuel required for any capacity of biomass Boiler for any fuel.
Boiler Capacity - 1000 kg/hr
Steam Pressure - 10.5 kg/cm2(g)
Steam Temperature - 185.5 Deg c (Saturated Steam)- You will get this value in steam table
Enthalpy of Saturated Steam - 664.2 kcal/kg-You will get this value in steam table
Enthalpy of Feed water - 105 kcal/kg - You will get this value in steam table
Fuel - Bagasse with 50% moisture
Calorific value(GCV) - 2272 kcal/kg- (It is the amount of heat liberated in Kcal by the complete combustion of 1 kg of fuel)
Boiler Efficiency - 70 % on GCV Basis ( It can be calculated by deducting the losses. Carbon loss, radiation loss, dry gas loss, H2O in Air, H2O in Fuel etc)
These parameters are required to calculate fuel consumption to boiler.
Fuel Required = Heat Input required (kcal/hr.) / Calorific Value of that fuel (kcal/kg)
Heat Input required (kcal/hr.)= (Boiler Capacity x (Steam Enthalpy - Feed water Enthalpy))/(Boiler Efficiency)
For above parametersHeat Input required = 1000 x (664.2 -105)/0.7 = 798857.14 kcal/hr
Fuel Required = 798857.14/2272 = 351.6 kg/hr
Fuel Required for 1 TPH Boiler is 351.6 kg/hr.
That means by burning 351.6 kg/hr of of Bagasse, you can generate 1000 kg/hr saturated steam at 10.5 kg/cm2(g) pressure.
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