Combustion Reaction Calculator: Stoichiometric Air & Flue Gas Analysis

Combustion Reaction Calculation Form

Number of Carbon atoms (C) in one mole of fuel.
Number of Hydrogen atoms (H) in one mole of fuel.
Number of Oxygen atoms (O) in one mole of fuel. Enter 0 if none.
The percentage of air supplied beyond the stoichiometric requirement (0-200%).

Our Combustion Reaction Calculator helps engineers and students quickly determine stoichiometric air requirements, excess air percentages, and the final flue gas composition for hydrocarbon fuels (CxHyOz). Optimize furnace efficiency and understand combustion chemistry with precise calculations.

Formula:

The core of combustion calculation involves balancing the chemical equation for a hydrocarbon fuel (CxHyOz) reacting with air (approximated as O2 + 3.76N2).

General Formula:

CxHyOz + a(O2 + 3.76N2) → xCO2 + (y/2)H2O + (a × 3.76)N2 + O2,excess

Where:

  • x: Number of Carbon atoms in the fuel.
  • y: Number of Hydrogen atoms in the fuel.
  • z: Number of Oxygen atoms in the fuel.
  • a: Stoichiometric moles of O2 required = x + y/4 - z/2
  • Excess Air %: The percentage of air supplied beyond the stoichiometric requirement.

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