Rotary Vacuum Paddle Dryer
Description:

Rotary vacuum paddle Dryer or Paddle Dryer is used to obtain dry Powder from wet cake or solutions. The efficiency is very high and the operating costs are low compared to other types of dryers. It is a closed system in which hot water ,steam, or hot fluid is used as a heating medium in the jacket, in the hollow paddle and in the hallow shaft. Dust collector, condenser, receiver and vacuum pump are part of the system. The continuous agitation by means of heated rotating paddles and minimum clearance between scrapers and heated walls provide a good heat transfer to the wet feed. This results in the solvent/moisture evaporating off and renders the wet material dry, to the required degree. The vapors formed are removed by means of vacuum. Absence of large air flows virtually eliminates dust problems and also the energy consumption remains low. Some of the salient features of a Rotary vacuum paddle Dryer made by us are described below

FEATURES:
  • Common base frame is unique to this system. This eliminated the need of foundation cost and reduces the maintenance cost.
  • Drying optimization, this is done by means of external and internal heating. External heating is by means of jacket or limpet coils, while internal heating through a hollow shaft and a set of hollow paddles. Hallow paddles are provided with scrapers having very low gap from wall to maximise heat transfer.
  • Scrapers move material to all parts of the dryer and also help in discharging the material.
  • The hollow rotating agitator shaft imparts heat to the product, scrapes the shell wall ,tumbles the product for maximum heat transfer and discharge product when required.
  • The large heat transfer area available on the wide paddles and hollow shaft give maximum heat transfer efficiency to the product.
  • Mechanical seals at Shell ends/Stuffing Box.
  • The vessel is well design to take temperature stresses during vacuum drying. Low power consumption by the use of helical bevel gear box.
  • Special floating bearing design to combat temperature stresses.
  • To remove the condensate formed by steam heating in the hallow shaft, Special rotary joints are also designed to introduce heating media in the hollow shaft.
  • Product Filter is very efficiently used to arrest valuable product carried away with the vapours in a filter bag The arrested product particles are thrown back into the dryer by reverse flow of pulsating air.Generally the product filter are heated to avoid condensations of vapors in the filter bag.
  • User friendly discharge valve design provides vacuum tight closing when the material is processed and quick opening lever facilities filling of bags when material discharge and packed.
  • Breaker bars are incorporated in the RVPD to break the lumps where the product forms lumps during drying.
  • Insulation with Cladding will provided on heating jacket/Limpet coil.

PROCESS ADVANTAGES:

These dryers give optimum performance with very high heat transfer rates.
These dryers have been successfully used for reaction, crystallization, and extraction operations in addition to the primary function of drying.
Low temperature drying for heat sensitive product is possible.
Complete solvent recovery is possible with this Rotary vacuum paddle Dryer.

The Cantilever Model have following versatile features:

Full door opening for ease of operation, cleaning and validation.
Clean area installation possible with stainless steel partition wall between the process area and drives
The paddle dryer is also supplied with machined and mirror polished inside surfaces with PTFE Scrapers.


TECHNICAL SPECIFICATION:
MODEL MERVPD 500 MERVPD 750 MERVPD 1000 MERVPD 1500 MERVPD 2000 MERVPD 3000 MERVPD 4000 MERVPD 5000
Total Volume in Ltrs 500 750 1000 1500 2000 3000 4000 5000
Working Volume in Ltrs 300 450 600 900 1200 1800 2400 3000
Capacity in Kg (max) 175 250 350 500 700 1000 1350 1700
Shell Dia mm 650 725 800 900 1000 1100 1250 1350
Shell Lenth mm 1500 2000 2000 2350 2600 3200 3300 3500
RPM of Paddle 14 12 10 10 8 8 8 6
Heat transfer area in m2 4 5 7.5 9 10 14 17 20
Dust Filter Area m2 0.25 0.35 0.5 0.75 1 1.25 1.5 1.75
Condenser in m2 1.5 2 2.5 3 3.5 4 4 4
Receiver in Ltrs 75 100 150 200 250 250 250 250
Charging Ht in mm 1650 1750 1900 2200 2300 2400 2600 2800
Discharging Ht in mm 650 650 750 750 750 750 750 750
Charging Size in mm Φ 100 Φ 100 Φ 125 Φ 125 Φ 150 Φ 500 Φ 200 Φ 200
Discharging Size in mm Φ 150 Φ 175 Φ 200 Φ 200 Φ 250 Φ 250 Φ 300 Φ 300
Gear Box 4” 4” 5” 5” 6” 7” 8” 10”
Main drive motor 5HP 5HP 7.5HP 7.5HP 10 15 20 25
Design Temp: 200OC, Testing: Vacuum side Full vacuum upto 750 mm of Hg & Steam/Hot water jacket side 5 Kgs/cm2 pressure test.
Length in mm 2900 3350 3750 4350 4750 5250 5500 5750
Width In mm 950 1050 1125 1200 1325 1500 1625 1700
Height in mm 2200 2500 2850 3000 3250 3700 3800 4000
Weight in Kg (Aprox) 800 1000 1250 1500 1900 2500 3000 3500
                 

CANTILEVER MODEL
MODEL MERVPD 50 MERVPD 100 MERVPD 200 MERVPD 500 MERVPD
750
MERVPD
1000
MERVPD
1500
MERVPD 2000
Total Volume in Ltrs 50 100 200 500 750 1000 1500 2000
Working Volume in Ltrs 30 60 120 300 450 600 900 1200
Capacity in Kg (max) 15 30 75 175 250 350 500 700
Shell Dia mm 400 475 600 800 900 1000 1100 1250
Shell Lenth mm 450 600 750 1000 1175 1300 1600 1650
RPM of Paddle 16 16 14 14 12 10 10 08
Heat transfer area in m2 1.1 1.5 2.1 4.0 5.0 7.5 9.0 10
Dust Filter Area m2 0.05 0.07 0.10 0.25 0.35 0.50 0.75 1.00
Condenser in m2 0.25 0.50 1.0 1.5 2 2.5 3.0 3.5
Receiver in Ltrs 15 25 50 75 100 150 200 250
Charging Ht in mm 1800 2000 2300 1750 1900 2000 2300 2550
Discharging Ht in mm 600 600 650 650 650 750 750 750
Charging Size in mm Φ 100 Φ 100 Φ125 Φ 100 Φ 100 Φ 125 Φ 125 Φ 150
Discharging Size in mm Φ 125 Φ 150 Φ 175 Φ 200 Φ 225 Φ 250 Φ 250 Φ 300
Gear Box 2” 3.5” 3” 4” 4” 5” 5” 6”
Main drive motor 1HP 2HP 3HP 5HP 5HP 7.5HP 7.5HP 10
Design Temp: 2000C, Testing: Vacuum side Full vacuum upto 750 mm of Hg & Steam/Hot water jacket side 5 Kgs/cm2 pressure test.
Length in mm 1500 1800 2300 2800 3200 3500 4000 4500
Width In mm 600 750 900 1125 1200 1325 1500 1625
Height in mm 1800 2200 2500 2850 3000 3250 3700 3800
Weight in Kg (Aprox) 400 500 600 800 1000 1250 1500 1900