# Fuel efficiency

The gravimetric analysis of an anthracite fuel is 90% carbon, 3% hydrogen, 2% oxygen, and 1% nitrogen. Given that analysis of the dry combustion products by volume is 16.2% CO2, 3.5% O2, and 80.3% N2, during the combustion process of anthracite, which considers a solid fuel, some combustibles exit in fly ash with a weight fraction equal to 19% and temperature 270 °C, The fly ash is 15 % of the total ash, and there are losses due to combustibles in slag ash where the combustibles with weight fraction equal 5% and temperature 4500 °C. Ignoring the weight fraction of the water in the fuel, take the ambient condition 298K, 0.1MPa. Calculate the combustion efficiency if the weight fraction of ash in fuel is 30%. For anthracite fuel, take the value of the constant K in dry flue gas losses by 0.67 on the gross C.V basis and by 0.68 on the net C.V basis. The heat reaction of CO to that of CO2 equals 65.

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