Tutorial 2 - Drying.pdf

Determine the time required to dry the slab to 10

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Determine the time required to dry the slab to 10% moisture content (wet basis). Table 1 Wet slab weight, kg Drying rate, kg/m 2 .h 9.1 4.9 7.2 4.9 5.3 4.4 4.2 3.9 3.3 3.4 2.9 2.0 2.7 1.0 7. A wet filter cake in a pan 1 ft x 1 ft square and 1 inch thick is dried on the top surface with air at wet bulb temperature of 80 o F and a dry bulb of 120 o F flowing parallel to the surface at a velocity of 2.5 ft/s. The dry density of the cake is 150 lbm/ft 3 and the critical free moisture content is 0.09 lb H 2 O/lb dry solid. How long will it take to dry the material from a free moisture content of 0.20 lb H 2 O/lb dry sold to the critical moisture content? [t = 17.03h] 8. Slabs of filter cake with a bone-dry density of 1600 kg/m 3 are to be dried from an initial free moisture content of 90% (dry basis) to a final free moisture content of 5% (dry basis) batchwise in trays that are 1 m long by 0.5 m wide with a depth of 3 cm. Drying will take place only from the top surface. The drying air conditions are 1 atm, 60 o C and a 39 o C wet bulb temperature. Air flows perpendicular to the top surface at velocity of 3.5 m/s. Experiments under these drying conditions show a critical free moisture content of 45% (dry basis) with assuming that the drying rate is a linear with free moisture content through origin. Determine: a) The drying time for the constant rate period in hours. b) The drying time for the falling rate period in hours.
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  • Fall '19
  • Atmospheric thermodynamics

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