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Boiler ID Fan Capacity Calculator

Boiler & Fuel Data

Boiler Capacity (TPH) Fuel Consumption (kg/hr)

Fuel Ultimate Analysis (%)

Carbon, C (%) Hydrogen, H₂ (%) Oxygen, O₂ in Fuel (%) Sulphur, S (%) Moisture (%)

Flue Gas Data

O₂ in Flue Gas (%) Flue Gas Temperature (°C)

ID Fan Design

ID Fan Design Margin (%)

Atmospheric / Reference Temperature: 30 °C

Theoretical Air Requirement: kg air/kg fuel

Excess Air: %

Actual Air Requirement: kg air/kg fuel

Dry Flue Gas: kg/kg fuel

Water Vapour: kg/kg fuel

Total Wet Flue Gas: kg/kg fuel

Flue Gas Volume at Reference Condition: Nm³/hr

Flue Gas Volume at Actual Flue Gas Temperature: m³/hr

Flue Gas Flow: m³/sec

Total Required ID Fan Capacity: m³/sec

Total Required ID Fan Capacity: m³/hr

ID Fan-1 Capacity: m³/sec

ID Fan-1 Capacity: m³/hr

ID Fan-2 Capacity: m³/sec

ID Fan-2 Capacity: m³/hr

Calculation assumptions:
• Atmospheric/reference temperature = 30°C.
• Atmospheric pressure = 1.01325 bar.
• Two ID fans are assumed.
• Both ID fans share the total flow equally.
• Flue-gas volume is corrected for actual flue-gas temperature.
• Design margin is added to the total required fan capacity.
• Final fan selection should consider ID fan static pressure, furnace pressure, ESP/bag filter DP, duct losses, chimney resistance, leakage air and fan efficiency.

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