Waste oil stove Principe of waste oil stove The release of potential energy of fuel by combustion with air requires several stages, namely. • mixing of air and fuel • ignition of the mixture • chemical reaction Disposal of products of combustion from the reaction site so that fresh reactants are available. Except mixing of air and fuel, all other stages are extremely fast such that it is said that if fuel and air are mixed, fuel is burnt. Accordingly mixing is the slowest step in the process of combustion this can be understood by considering that each mole of carbon theoretically requires 1 mole of oxygen for complete combustion. But 1 mole of oxygen is obtained from 4.76 moles of air. That means 3.76 moles of nitrogen are present with 1 mole of oxygen. Nitrogen is inert and does not take part in combustion therefore mixing of air + fuel is important Carton box