In direct heat Rotary Dryers a continuous feed of wet particulate material is dried by contact with heated air, while being transported along the interior of a rotating cylinder / rotating shell acting as the conveying device and stirrer. 
SSP offers Rotary Dryers in co-current (Parallel) and counter-current operation. In the former the wet material is exposed to the hottest air which enables heat sensitive or sticky material to be dried successfully. 
In counter-current operation, dried material is exposed to the hottest air helping to achieve very low moisture content. The hot gas may enter at a very high temperature which varies from product to product with maximum temperature as high as 350°C.

Steam tube dryer is one of the indirect heated rotary dryers, which contains rotating shell, rows of steam tubes arranged in concentric circles and extended throughout the length of the dryer. Steam tubes are designed to transfer heat from steam to the material being dried. This is one of the most energy efficient dryers. The tubes and radial fights together serve to agitate the material and to provide required residence time.

Industrial freeze dryer retains aroma, improves appearance and taste because freeze drying takes place at a low temperature which minimizes heat damage and retains volatile components (aroma). It also increases the shelf life of the dried product as compared to standard drying practices. Freeze-drying involves dehydration of food products at low temperature and pressure. As a result only the moisture is removed, leaving the molecular structure intact. The end product is light in weight with least or no change in volume. Worldwide freeze-drying technology is considered as the ultimate amongst all other dehydration methods. Hence this technique is currently being used for the production of instant coffee, instant tea, fruit pulp and other heat sensitive products.

It is best suited for continuous drying of temperature sensitive and sugar containing products at low temperature under vacuum conditions. The dryer consists of a vacuum chamber in which conveyer bands of food grade quality are arranged. The band passes over the hot plates heated internally by steam or hot water. Feed product is spread on the moving band and is dried as it moves on the hot plates. Dried product is obtained at the other end.

These types of dryers are mostly used in pharmaceutical companies. This is a batch type dryer heated by steam (Indirect). This dryer can also be used as a sterilizer. Recovery of solvent from powder is possible using such dryer.

Paddle Dryer is an indirect heat transmission dryer, a machine that processes organic and inorganic granular and powdery materials. It dries (or cools) such materials by bringing them into direct contact with revolving wedge-shaped hollow heaters (paddles) without using air as a heating medium.

The Process
SSP’s paddle dryer is designed to facilitate intimate mixing for optimized heat transfer.
A screw feeder is used to feed the wet material into the system. Our process indirectly heats the wet mass with dry and saturated steam. The main hollow shaft holds the paddles in place. The steam enters the paddles and heats up its walls uniformly using a rotary joint which also works for condensate removal.

As the wet mass moves forward in the system it releases vapor and dries up. The dried material is taken out from the dryer drum through the outlet.

The vapors are removed from the dryer along with some fine particles to be collected in a cyclone separator. The hot air then passes through a wet scrubber to trap finer particles and flu gases from the dryer to release clean air.

SSP can design and customize paddle dryer for use with a variety of heat sources, which has a vast number of applications: