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ID: 1861805 • Letter: P
Question
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(Drying time in a continuous counterflow dryer) A wet solid having 25% moisture is to be dried at a rate of 1000 kg/h to 1% moisture in a continuous countercurrent dryer The drying air enters at 100 degree C at a rate of 12,000 kg/h (dry basis) with a humidity of 0.025 kg per kg dry air and the dry solid leaves at 60 degree C. The temperature of the wet solid entering the dryer is nearly the same as the adiabatic saturation temperature of the air leaving the dryer Following data and information are available: gas-phase mass transfer coefficient for drying f the solid KY = 150 kg/m2- h: effective surface area of the solid = 0.065 m2 / kg dry solid; specific heat of the solid, CPS = 0.96 kJ/kg K; critical moisture of the solid is 8%: the equilibrium moisture is negligible. All moistures are on wet basis. Calculate the drying time.Explanation / Answer
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