Energy
Boiler Fuel Consumption Calculator
Calculate boiler fuel consumption from steam production, steam enthalpy, feedwater temperature, boiler efficiency and fuel heating value.
Use the steam enthalpy corresponding to the actual steam pressure and condition.
A fuel unit may be kg, litre, Nm³ or another unit, provided the heating value uses the same basis.
Optional. Enter operating hours to estimate annual fuel consumption.
Fuel Consumption Rate
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Estimated fuel required at the entered steam production and boiler efficiency.
Fuel consumption rate
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Fuel per tonne of steam
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Useful heat to steam
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Fuel energy input
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Heat required per tonne of steam
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Feedwater enthalpy
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Annual fuel consumption
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Method:
Feedwater enthalpy is approximated as:
hfw ≈ 4.186 × T
in kJ/kg, referenced approximately to liquid water at 0°C.
Useful heat required to generate steam is:
Qsteam =
ṁsteam ×
(hsteam − hfw)
Boiler fuel-energy input is:
Qfuel =
Qsteam ÷ Boiler Efficiency
Fuel consumption is:
Fuel Consumption =
Fuel Energy Input ÷ Fuel Heating Value
Fuel required per tonne of steam is calculated using the same heat balance on a 1,000 kg steam basis.
Heating value and boiler efficiency should use a consistent HHV or LHV basis.
This calculator assumes steady operation and uses a simplified feedwater enthalpy approximation. For high-accuracy steam-system analysis, use steam-table enthalpy for both the steam and feedwater states.