Firing Rate of Gas Fuel Flow Calculations

Heating Input or Gas Firing Rate for Gas Burners

  • The heat input () to a system can be calculated using the fuel flow rate () and the heating value (L) of the fuel.
  • The heating value represents the amount of energy released per unit mass or volume of the fuel. The formula for calculating heat input is:


  • is the heat input (measured in energy units such as Joules or British Thermal Units, BTUs),
  • is the mass flow rate of gas fuel (measured in mass or volume per unit time, e.g., kg/s or L/min),
  • L is the Lower heating value of the fuel (measured in energy per unit mass or volume, e.g., J/kg or BTU/L).
  •   Make sure that the units for fuel flow rate and heating value are compatible, and if necessary, convert them to a consistent set of units before plugging them into the formula.
  • For example, let’s say you have a fuel flow rate of 5 kg/s and a heating value of 45,000 J/kg.
  • The heat input () would be:

              Q=5 kg/s×45,000 J/kg=225,000 J/s

  • You can further convert the result to kilowatts (kW) by dividing by 1,000 (since 1 kW = 1,000 J/s):

                Q=225,000 J/s1,000=225 kW

  • So, the heat input to the system would be 225 kW in this example.

Calculation of Air Required for Burning of LPG Fuel

  • Insert Firing rate in MW or Million Btu/hr
  • Insert the values of fuel composition: C2H6: 50%, C3H8: 50%
  • Get values of the amount of gas and air consumption
  • For more information visit the website of CFD Flow Engineering