The ultimate analysis of a No. 4 fuel oil is 86.47 wt% carbon. 11.65% hydrogen, 1.35 sulfur, and the balance noncombustible inerts. This oil is burned in a steam-generating furnace with 15% excess air. The air is preheated to 175°C and enters the furnace at a gauge pressure of 180 mm Hg. The sulfur and hydrogen in the fuel are completely oxidized to SO2 and H2O; 5% of the carbon is oxidized to CO, and the balance forms CO2.
(a) Calculate the feed ratio (m3 air)/(kg oil).
(b) Calculate the mole fractions (dry basis) and ppm (parts per million on a wet basis, or moles contained in 106 moles of the wet stack gas) of the stack-gas species that might be considered environmental hazards.
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