MINIMUM AIR REQUIRED FOR COMPLETE COMBUSTION OF SOLID/LIQUID FUELS

Let C, H, O, and S = percent by mass of C, H₂, O_2, and S in fuel. Then, the mass of O₂ required per kg of fuel for complete combustion

Percentage of O₂ by mass in air = 23%

∴ Minimum amount of air required in kg per kg of fuel for complete combustion