Gas Burner Sizing & Firing-Type Selector

Estimate thermal efficiency, fuel & combustion-air flow, and get a firing-type and burner-technology recommendation for an industrial furnace at a given heat load — using the indirect (heat-loss) method.

Furnace & process inputs

Required heat load

Fuel type

Flue gas exit temp (°C)

Ambient temp (°C)

Excess air: 15%

Emission target

Results

Thermal efficiency –

Flue gas (stack) loss –

Fuel consumption –

Combustion air required –

Indicative NOx level –

Recommended firing type will appear here after calculating.

Heat load band	Typical firing type	Draft / burner arrangement
< 50 kW	Natural-draft, self-aspirating burner	Single atmospheric nozzle-mix burner
50 – 500 kW	Forced-draft packaged burner	Single block burner, blower + damper control
500 kW – 5 MW	High-turndown industrial burner	Single/multi-burner, forced draft, ratio control
5 – 20 MW	Multi-burner zoned firing	Forced/induced draft, recuperative preheat optional
> 20 MW	Regenerative / flameless firing	Alternating regenerative burner pairs

Calculations use the simplified indirect (heat-loss) method: efficiency = 100% − dry flue-gas loss − fixed allowance for radiation/convection and unburnt losses (3.5% standard, 4.5% for FGR-based low-NOx configurations). Fuel GCV and stoichiometric air-fuel ratios are representative averages, not measured values for your specific fuel supply. This tool gives a preliminary, order-of-magnitude estimate for concept selection — final burner sizing, air-fuel train design and emissions compliance must be verified with the burner manufacturer and a certified combustion/process engineer against local codes (e.g. CPCB/EPA/EN limits).