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combustion of coal
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Air required for combustion per pound of coal
ByEr. Laxman Singh Sankhla B.E.Mech., Chartered EngineerJodhpur, IndiaMail ID: laxman9992001@yahoo.co.in
A bituminous coal has the following ultimate analysis:C = 71.6N = 1.3A = 9.1H = 4.8S = 3.4W = 3.5O = 6.3Calculate the total air required for complete combustion per pound of coal. The excess air is assumed 20%.
The theoretical air requirement is calculated as follows:Wta = 11.53C + 34.36 (H O/8) + 4.32SOr, Wta = 11.53*0.716 + 34.36*(0.048-0.063/8) + 4.32*0.034Or, Wta = 9.78 lb/lb of coal.Now, calculate the total air:Excess air percentage = (Wa Wta)/ Wta *100Or, 0.2 = (Wa 9.78)/9.78 *100Or, Wa = 11.74 lb/lb of coal.
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