A direct fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lb m ) 1 Products of combustion are CO 2 (g) and H 2 O(g) The composition of the oil is 85 carbon, 12 hydrogen, 2 nitrogen, and 1 water by weight The flue gases leave the dryer at 400(F), and a partial analysis shows t...

To calculate the amount of water evaporated in the dryer per pound of oil burned we can use the energy balance equation The energy supplied by burning ...

A direct-fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lb m )

Question:

A direct-fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lb_m)⁻¹. [Products of combustion are CO₂(g) and H₂O(g).] The composition of the oil is 85% carbon, 12% hydrogen, 2% nitrogen, and 1% water by weight. The flue gases leave the dryer at 400(°F), and a partial analysis shows that they contain 3 mol-% CO₂ and 11.8 mol-% CO on a dry basis. The fuel, air, and material being dried enter the dryer at 77(°F). If the entering air is saturated with water and if 30% of the net heating value of the oil is allowed for heat losses (including the sensible heat carried out with the dried product), how much water is evaporated in the dryer per (lb_m) of oil burned?

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