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Rotary Vacuum Paddle Dryer or Paddle Dryer
is used to obtain dry powder from wet cake or solutions. The
drying is a batch process and often carried out under vacuum.
The efficiency is very high and the operating costs are low
compared to other types of dryers. The product is heated through
jacket from outside and rotating hollow shaft and paddles
from within. The heating is by steam or hot liquid. The HL
Rotary Vacuum Paddle Dryer is adequately designed to counter
stresses developed by vacuum and temperature variations prevailing
in the various heated parts. Product filter, condenser, receiver
and vacuum pump are part of the system.
The Paddle Dryer is also used for
- Low temperature drying,
- Reaction,
- Crystallization,
- Extraction of useful liquids,
- Recovery of solvents.
Special designs are available for drying application in Pharmaceutical
Industries complying cGMP standards. Different designs are
available with non-heated shaft and flat ends. Materials of
construction available are alloys of Stainless Steel and Hastelloy.
The Paddle Dryers are designed as per ASME Pressure Vessel
Code and can also be supplied conforming to
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DRIVE WITH SHAFT-MOUNTED GEARBOX
- Gear box mounted on driven shaft, optimizes power
consumption, reduces maintenance and saves on foundation
cost.
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DRIVE WITH BASE-MOUNTED GEARBOX
- Standard designs with gearbox and chain drive are
widely employed in the Paddle Dryer. Special skid-mounted
design avoids foundation cost and reduces maintenance
cost.
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HOLLOW SHAFT AND PADDLES
- The hollow rotating agitator shaft imparts heat
to the product, scrapes the shell wall, tumbles the
product for maximum heat transfer and discharges product
when required.
- The large heat transfer area available on the wide
paddles and hollow shaft give maximum heat transfer
efficiency to the product.
- The scrapers have minimum calculated clearance from
the shell to keep the shell clean and increase heat
transfer co-efficient.
- Unique condensate removal mechanism employed in
the shaft.
- Mechanical Seals are offered for high vacuums.
- Shaft is hardened and ground when gland packing
is used.
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DISCHARGE VALVE
- User friendly discharge valve design provides vacuum
tight closing when the material is processed and quick
opening lever facilitates filling of bags when material
is discharged and packed.
- Pneumatically closing, opening, locking and cleaning
mechanism is offered for automation.
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PRODUCT FILTER
- 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 filters are heated to avoid
condensation of vapors in the filter bag.
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Application
