What is the fuel consumption of a 10,000#/hr steam boiler using diesel as fuel (VHI = 130,000 BTU/gal) with a feedwater temperature of 154 °F?

FC = [ SP * ( hs – hw ) / ( BE * VHI ) ]

                FC = [ SP * ( hs – hw ) / ( BE * VHI ) ]

                FC = [ 10000 * (1190 – 122) / ( 0.8 * 130000) ]

                FC = 102.7 gal

Where,

                FC = Fuel consumption SP = steam produced

                hs = enthalpy of steam @ 100 PSIG

                hw = enthalpy of feedwater @ saturation temperature

                BE = Boiler efficiency VHI = Fuel heating value

NOTES - The following will help in the use of this formula

                hs = 1190 BTU/# constant @ 100 PSIG

                hw = enthalpy of saturated water at saturation temperature (steam tables)

                Boiler efficiency is assumed to be 80%

                Common fuel heating values: