An adiabatic dryer is operated as shown in the figure below. The entire system operates at...
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An adiabatic dryer is operated as shown in the figure below. The entire system operates at 1 atmosphere (absolute). The feed (Stream 1) contains 100 kg/h of "dry" solids and 122 kg/h of water. The solids are dried to 8 wt% water (Stream 2) by contact with hot air (Stream 4). Fresh air (Stream 3) at 21 C is heated to 52 C (Stream 4), with an absolute humidity of 0.011 kg water/kg Dry Air. The warm, moist air which has dried the solids is vented to the atmosphere (Stream 5) Heater Fresh air IN 21 C Wet solids IN 100kg/h solid +122 kg/h water Adiabatic Dryer Wet Air OUT 5 Dried solids OUT 8% water a) Determine the total and water mass flows of stream 2. [kg/h]. b) The dryer works adiabatically. The wet air leaving the dryer has a relative humidity of 90%. Show (and label) streams 3, 4 and 5, on the chart, and indicate the path the air stream follows from point 3 to 5. Determine the absolute humidity of stream 5. c) Determine the flow rate of dry air required to perform the drying [kg/h]. d) How much energy [kW] must be added to the heater? An adiabatic dryer is operated as shown in the figure below. The entire system operates at 1 atmosphere (absolute). The feed (Stream 1) contains 100 kg/h of "dry" solids and 122 kg/h of water. The solids are dried to 8 wt% water (Stream 2) by contact with hot air (Stream 4). Fresh air (Stream 3) at 21 C is heated to 52 C (Stream 4), with an absolute humidity of 0.011 kg water/kg Dry Air. The warm, moist air which has dried the solids is vented to the atmosphere (Stream 5) Heater Fresh air IN 21 C Wet solids IN 100kg/h solid +122 kg/h water Adiabatic Dryer Wet Air OUT 5 Dried solids OUT 8% water a) Determine the total and water mass flows of stream 2. [kg/h]. b) The dryer works adiabatically. The wet air leaving the dryer has a relative humidity of 90%. Show (and label) streams 3, 4 and 5, on the chart, and indicate the path the air stream follows from point 3 to 5. Determine the absolute humidity of stream 5. c) Determine the flow rate of dry air required to perform the drying [kg/h]. d) How much energy [kW] must be added to the heater?
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Related Book For
Elementary Principles of Chemical Processes
ISBN: 978-1119498759
4th edition
Authors: Richard M. Felder, ? Ronald W. Rousseau, ? Lisa G. Bullard
Posted Date:
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