🔥 Combustion Products Calculator
Compute stoichiometry, flue gas composition, excess air, and adiabatic flame temperature for common fuels.
📝 Configuration
Key:
O₂_stoich = C/12 + H/4 − O/32 + S/32
T_ad = T_air + Hc / Σ(nᵢ·Cpᵢ)
O₂_stoich = C/12 + H/4 − O/32 + S/32
T_ad = T_air + Hc / Σ(nᵢ·Cpᵢ)
📊 Results
Configure inputs and click Compute.
📘 Methodology
Stoichiometry
Complete combustion stoichiometry computes the theoretical O₂ demand from the fuel's ultimate analysis (C, H, O, S mass fractions). Excess air ensures complete combustion and determines the O₂ content in flue gas.
Adiabatic Flame Temperature
T_ad = T_air + Hc / Σ(nᵢ·Cpᵢ), where Hc is the lower heating value and nᵢ are the product moles. This is a simplified first-law estimate assuming no dissociation or heat loss.
Air-Fuel Ratio
AFR = actual_air × MW_air / fuel_mass. Higher excess air lowers flame temperature but ensures complete combustion. Typical values: 10-20% excess for gas, 20-50% for solid fuels.