A Coal is 65% carbon by weight. During combustion 3% of the coal is lost in the

Question

A Coal is 65% carbon by weight. During combustion 3% of the coal is lost in the ash pit. Combustion uses 9..78 lbm (kg) of air per pound (kg) of fuel. The flue gas analysis is 81.55 nitrogen, 9.5% carbon dioxide and 9% oxygen. What is the percentage of excess air by mass?

a) 10%

b) 30%

c) 70%

d)140 %

The ultimate analysis of ca coal is 51.45% carbon 16.69% ash 15.71% mositure 7.28% oxyden 4.02% hydrigen 3.92% sulfur and 0.93# nitrogen 15, 395 lbm (6923kg) of the coal are burned and 2816 lbm (1267 kg) of ash conating 20.9% carbon ( by weight) are recovered. 13.3lbm (kg) of dry gases are produced per pound (kg) of fuel burned. how much air was used per unit mass of fuel?

a) 13 lbm air/lbm fuel

b) 14 lbm air/lbm fuel

c) 15 lbm air/ lbm fuel

d) 17 lbm air /lbm fuel

Explanation / Answer

first question C and second question A

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