n a chemical factory where dyes are made, wet cake at 30 OC consisting of 60% moisture is put in a dryer to obtain an output having only 5% moisture, at atmospheric pressure. In each batch about 120 kgs of material is dried. a. The quantity of moisture removed per batch. b. What is the total quantity ( sensible & latent) of heat required to evaporate the moisture, if the latent heat of water is 540 kcal/kg at atmospheric conditions, Ignore heat absorbed by the solids c. Find the quantity of steam required for the drying process (per batch), if steam at 4 kg/cm2 is used for generating hot air in the dryer and the dryer efficiency is 80%. Latent heat of steam at 4 kg/cm2 is 520 kcal/kg.

n a chemical factory where dyes are made, wet cake at 30 OC consisting of 60% moisture 

is put in a dryer to obtain an output having only 5% moisture, at atmospheric pressure. In 

each batch about 120 kgs of material is dried. 

a. The quantity of moisture removed per batch.

b. What is the total quantity ( sensible & latent) of heat required to evaporate the 

moisture, if the latent heat of water is 540 kcal/kg at atmospheric conditions, 

Ignore heat absorbed by the solids

c. Find the quantity of steam required for the drying process (per batch), if steam 

at 4 kg/cm2

is used for generating hot air in the dryer and the dryer efficiency 

is 80%. Latent heat of steam at 4 kg/cm2

is 520 kcal/kg.
by

1 Answer

Answer :

Given that 

 Qty of material dried per batch - 120 Kgs

 Moisture at inlet - 60%

a. The quantity of moisture removed per batch.

 Water quantity in a wet batch - 120 x 0.6 = 72 Kgs.

 Quantity of bone dry material - 120 – 72 = 48 Kgs.

 Moisture at outlet - 5%

 Total weight of dry batch output - 48/0.95 = 50.5 Kgs.

 Equivalent water in a dry batch - 50.5 - 48 = 2.5 Kgs.
by

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