Firing Rate of Gas Fuel Flow Calculations

Heating Input or Gas Firing Rate for Gas Burners

• The heat input ($Q$) to a system can be calculated using the fuel flow rate ($F$) and the heating value (L$HV$) 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:

      Q=M×HV

where:

• $Q$ is the heat input (measured in energy units such as Joules or British Thermal Units, BTUs),
• M  is the mass flow rate of gas fuel (measured in mass or volume per unit time, e.g., kg/s or L/min),
• $HV$ 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 ($Q$) would be:

$Q=5\text{kg/s}\times 45,000\text{J/kg}=225,000\text{J/s}$

• 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 kWQ=1,000225,000J/s​=225kW

• 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