Academics – Applied Heat : 2015/MAR/03
Question
Q5. A fuel with a mass analysis of 85% carbon 15% hydrogen is completely burned in air. The dry flue gas shows they contain 3.5% oxygen by volume.
(a) Use molar volumes to formulate the complete combustion equation in kmol per kg of fuel.
(b) Calculate EACH of the following:
(i) The percentage excess air by volume
(ii) The fuel air ratio by mass.
Note: Relative atomic masses H = 1, C = 12, N = 14, O = 16. Air contains 21% oxygen by volume
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