Closed loop boiling dryer for solvent materials

Design Scheme of Closed Circulating Fluidized Bed

1、 Design conditions

1. Material parameters

Material name: Material containing ethanol or alkyl solvents

Material moisture content; Initial moisture content 5%, final moisture content 0.5%

(Wet materials are calculated based on 45% ethanol and 5% water content)

Feed temperature: room temperature

Material fineness: 50-250 mesh

Material heating temperature: 35-11 ℃

Material characteristics: weak acid, alkaline pH 2-9

2. Public works section

Heat source: 0.4MPa steam

Cold source: chilled water -8 ℃, 30T/h

Cooling water (around 28 ℃ in summer and 5 ℃ in winter) 200T/h

Nitrogen 4kg/cm ² 90m ³/h

3. Require design capability

1) 1000-1300kg/batch, drying time 3-4 hours, final moisture content below 0.5%

2) Continuous discharge (storage container)

3) Easy to clean: The inner wall of the bed reaches a mirror finish

4) System washable (pipes, condenser)

5) System pressure resistance 0.05MPa (including fan, mixer, heater)

2、 Process Calculation

1. The amount of wet material containing ethanol

G1=1300×

=1300×

=2364kg/batch

2. Quantity of wet materials containing water

G2=1300×

=1300×

=1300×

=1361kg/batch

Total amount of wet materials

2364+1361-1300=2425kg/batch

Evaporation and ethanol content

W=2364-1300

=1064kg/batch

Ethanol evaporation rate per low hour 1064/3=355kg/h

Evaporation water volume

W=1361-1300

=61kg/batch

Evaporation rate at low intervals

61/3≈21kg/h

4. Heat Calculation

Q=355×（60-15）×0.4+355×204

=6390+72420

=78810 kcal/h

Specific heat of 0.4 ethanol

204- Thermal gasification of ethanol

60- Temperature at the outlet of the fluidized bed

15- Room temperature

Q=21×（60-15）×1+21×595

=945+12495

=13440 kcal/h 595- Heat of vaporization

Q=（2364+61）×0.9×（60-15）

=98212 high calorie/h

Q=Q+Q+Q

=78810+13440+98212

=190462 kcal/h

Q=Q × 1.2=228555 kcal/h