When selecting a dual-fuel burner, you can't just look at the "4 tons" figure; you also need to consider the boiler's rated evaporation capacity, thermal efficiency, fuel type, and furnace back pressure.
1. First, determine the size of the burner needed for a 4-ton boiler.
A 4 t/h steam boiler typically requires a combustion heat load of approximately 2.8–3.2 MW.
It's recommended to leave a certain margin in actual selection; therefore, the burner should ideally have a maximum output range of:
approximately 3.0–3.5 MW.
If we calculate based on the lower heating value of natural gas of approximately 10 kWh/Nm³, a 3 MW combustion heat load corresponds to approximately:
300 Nm³/h of natural gas consumption.
Actual operating conditions will vary depending on boiler efficiency, steam pressure, and load changes.
Then, the specific model is determined based on the following three data points:
1. Boiler operating pressure: e.g., 1.0 MPa, 1.25 MPa, 1.6 MPa
2. Natural gas pressure: e.g., 20 mbar, 50 mbar, 100 mbar, 300 mbar
3. Boiler furnace back pressure: This is a very critical data point.
The furnace back pressure provided by the boiler manufacturer must be matched with the burner combustion curve
