Rotary Vacuum Paddle Dryer

Rotary Vacuum Paddle Dryer is a jacketed cylindrical

vessel with a large diameter hollow shaft (Agitator).

Attached to the shaft are hollow paddle 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 period 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 be also be done by cold 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 provided in

way of gland packing areas of trunions. Arrangements for

nitrogen purging provided. Bag cleaning arrangements with pulsation by

nitrogen jet injector provided.

Heavy duty trunions and bearing support the hollow shaft (agitator) and

The drive is provided by means of a motor through reduction gears chain

and sprocket.

Provision has also been made to insert four breaker bars inside the dryer shell for particles size reduction.

In special case, stationary scrapper blade can be provided to scrape the rotating agitator, for highly sticky materials.

OPERATION

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 vapour

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.

SALIENT FEATURES

1. Ideal for temperature sensitive materials. 2. Almost 100 per cent recovery of solvents. 3. Low energy consumption.

OPERATING CONDITIONS

Vacuum : Upto even 0.6 torr

Heating temperature : 30ᵒ to 300ᵒC

CAPACITY RANGES

Gross Capacity : From 500 ltrs. to 10000 ltrs.

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