Rotary Vacuum Paddle Dyer (RVPD)

Rotary vacuum paddle dryer is a jacketed / limpet coil cylindrical vessel with a large diameter hollow shaft. Attached to the shaft are hollow paddles provided with specially designed scraper blades, which scrape the entire internal surface of the dryer and continuously move and rotate the material thereby precluding the possibility of material remaining in contact with hot surface for protracted periods of time.

The jacket and hollow shaft with paddles can be heated with hot water, steam or any other thermal fluid capable of providing a large indirect heat transfer area. Cooling can also be done by water, brine or any other refrigerant through the jacket and hollow shaft.

Limpet coil can be provided in lieu of jacket, if liquid heating medium is used. Hard facing of shaft is provided in the area of gland packing or trunnions. Arrangements for nitrogen purging is provided. Bag cleaning arrangement with pulsation by Nitrogen jet injector is provided. Heavy duty trunnions and bearing support the hollow shaft (agitator) and the drive is provided by means of a hollow output gearbox. Provision has also been made to insert four breaker bars inside the dryer shell for particle size reduction. In special cases, stationary scraper blade can be provided to scrap the rotating agitator, for highly sticky materials.

Slurry/wet cake is charged through the charging door while keeping rotation of the agitator on. Vacuum is then applied to the dryer along with dust catcher (mounted on the dryer) condenser and receiver. Heating medium is passed through the jacket and agitator. Vigorous evaporation of moisture takes place under vacuum. The vapor passes through the bag filters of the dust catcher, goes into the condenser and the condensate is collected in the receiver. Evaporation under high vacuum and low temperature results in faster recovery of maximum solvents. Adequate provision has been provided to cater for fluctuations in steam pressure/temperature, in condenser cooling water temperature, moisture content of feed etc. Dry product is discharged via the discharge valve by reversing the agitator rotational direction to “discharge” direction.

  • Ideal for Temperature sensitive materials
  • Almost 100 percent recovery of solvent
  • Low energy consumption
  •  
  • Operating Conditions

    Vacuum                               : Upto even 0.6 torr

    Heating Temperature      : 30° to 300°C

    Capacity Ranges

    Gross Capacity: From 500 Ltrs. to 25,000 Ltrs.

     Charging Capacity : 40 to 60% of Gross Capacity depending on the nature of the products.

    Note:

    Design and selection of the suitable configuration of Rotary Vacuum Dryers for the specific application is extremely important. Magtech Process Equipments Pvt. Ltd. has the necessary expertise and Pilot Plant to ensure proper selection of the system.

Model

Gross Capacity ltrs.

Charging capacity ltrs./m2

Heating surface sq. m.

H.P.

Dimension in mm.

A

B

C

D

E

F

G

H

RVD-5

500

200

3.8

7.5

600

1800

4100

4400

6100

2000

1000

3800

RVD-12

1200

480

9.5

10

1000

2000

4300

4700

6700

2500

1500

4200

RVD-16

1600

640

10.5

15

1000

2800

5100

5500

7500

2500

1500

4200

RVD-25

2500

1000

13.6

20

1200

3000

5300

5700

8500

2500

1500

4200

RVD-30

3000

1200

18.4

20

1200

3400

5700

6200

9600

3000

1500

4400

RVD-40

4000

1600

19.5

30

1400

3500

5900

6600

10600

3000

1500

4600

RVD-63

6300

2520

28.1

40

1600

4100

6700

7000

11000

3000

1500

4600

RVD-80

8000

3200

37.2

50

1700

4600

7600

7800

12500

3500

2000

4700

RVD-98

9800

3920

40.0

60

1800

5300

8400

8000

14500

3500

2500

6200

RVD-160

16000

6400

53.1

80

2000

5900

8400

8600

15000

3500

2500

6700

RVD-200

20000

8000

82.0

100

2500

8000

15000

16500

23500

4200

3000

6800

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