Question: Coal containing C = 68.2% H=4.5% S = 0.7% N = 1.7%0 7.8% Ash = 4.4% and water = 12.7% is burnt in a

Coal containing C = 68.2% H=4.5% S = 0.7% N = 1.7%0

Coal containing C = 68.2% H=4.5% S = 0.7% N = 1.7%0 7.8% Ash = 4.4% and water = 12.7% is burnt in a furnace. The product of combustion dry gas, analyses CO2 = 14.4%, O2 = 4.6% and rest N2. Calculate: (i) The theoretical volume of air used for the complete combustion of 100 kg of coal. (ii) The percentage of excess air used. [25 Marks]

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