A direct-fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lbm)-. [Products...

 

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A direct-fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lbm)-. [Products of combustion are CO2(g) and H20(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-% CO, 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 sen- sible heat carried out with the dried product), how much water is evaporated in the dryer per (lbm) of oil burned? A direct-fired dryer burns a fuel oil with a lower heating value of 19,000(Btu) (lbm)-. [Products of combustion are CO2(g) and H20(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-% CO, 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 sen- sible heat carried out with the dried product), how much water is evaporated in the dryer per (lbm) of oil burned?