This article is based on reality and talks about the information that needs to be paid attention to and collected when selecting a burner.

Part One: Calculate the parameters required for the burner based on the boiler and fuel.

1. Determine relevant information about the boiler

• Boiler capacity and efficiency

• Furnace back pressure

• Fuel

• Burner fuel inlet pressure

• Burner capacity adjustment method

2 .Calculate burner capacity. Burner capacity = Boiler capacity/efficiency

Example: Boiler capacity 6,500 kW, efficiency 90 % → Burner capacity = 6,500 kW / 0.9 = 7,220 kW.

3 .Gas burner: required gas flow [m3n/h] = (burner capacity [kW] x 3.6)/gas calorific value [MJ/m3n].

Example: Burner capacity = 7,220 kW → Required gas flow = (7,220 kWx 3.6)/35.8 MJ/m3n

= 726 m3n/h, where 35.8 MJ/m3n is the calorific value of natural gas.

4. Oil burner: Calculate the required oil flow rate [kg/h]. Required oil flow [kg/h] = (burner capacity [kW] x 3.6)/heating value of oil [MJ/kg].

Example: Required burner capacity = 7,220kW → Required oil flow = (7,220 kW x 3.6)/42.7 MJ/kg = 609

kg/h, of which 42.7MJ/kg is the calorific value of light oil.

5. Check that the external dimensions of the burner, especially those of the burner head, are suitable for the application; the length of the burner head should be such that when installed, the burner head is flush with the furnace wall or inside the furnace by approximately 10 to 20 mm.

6. Check the flame size in the flame size chart. Please note that the flames must not come into contact with the wall stove.

7. Accessory requirements must also be considered: gas pressure regulator, pumping unit, boiler thermostat/barostat.