In ordinary Tray Dryer, heat passes through longer distance whereas in Fluid Bed Dryers the heat passes through floating material and vapor diffuses through a small distance, due to this the material dries very fast.
As the temperature through the Fluid Bed Dryer is uniform there is uniformity in drying of the materials, which in turn helps to achieve higher production as compared to other Dryers.
In Fluid Bed Dryer, the material comes in close contact with the drying air at low temperature and for a short period and hence there are less chances of the physical and chemical properties of the products/materials changing during the process of drying as compared to Tray Dryer where the material is not in close contact with the Drying Air.
In Fluid Bed dryer, the product / materials are kept in one container and this saves time, labor, cleaning, loading and Unloading, which is not in Tray Dryer.
The floor space required in Fluid Bed Dryer is less as compared to Tray Dryer.
In Fluid Bed Dryer, three times more production can be given within a specified period than in a Tray Dryer
Fabricated out of heavy gauge Stainless Steel and provided with glass window. The base of the container is fitted with a specially designed plate of Sandwich Type construction and shall be air tight. This maintains even distribution of drying air and uniformity in drying.
The Fluid Bed Dryer can be heated either by electrically or by steam. Steam Units will be provided with Heat Exchanger and Electrical Units will be provided with Open Type Heating Elements.
This is fabricated of Fabric Cloth and can be easily fitted in the Dryer and can be removed as well whenever required for laundering conveniently.
All the main controls have been fitted together in a separate Control Box in front side of the Dryer. The Starter for Fan Motor and other electrical instruments shall be fitted in the Control Box.
Steam heated models shall be provided with solenoid valves for Temperature Control.
'SAKAV' is involved in continuous innovative developments to incorporate the latest technology. As such Specifications are subject to change without notice.
SAKAV with its in-house design capabilities ha built and supplied a range of Rotary Disc Atomizer. These are belt driven units with standard electrical motors. A number of models are available with wheel diameters of 100mm to 350mm and are suitable for capacities from 5 lit/hr to 10,000 lit/hr Various configurations such as orifice, pin, vane with stainless steel and ceramic wear parts are available. A variety of lubrication systems starting from continuous drip to fully automatic forced lubrication systems can be provided. Speed variations are achieved by changed pulleys or variable frequency drivers.
Fully equipped dedicated Pilot Spray Dryers are available for conducting trials on customers samples and simulation of ideal drying parameters for individual products. Assessment of their physical properties such as moisture content, approximate particle size distribution and bulk density. Testing is an on-going process and SAKAV has, over the years, built-up a large data base for a wide variety of products.
The chamber configuration plays an important part in meeting the end product requirements. As is apparent from the table there is an endless number of possible combination. Some of these have been depicted below.
This is the most widely used configuration of spray chamber with flat roof construction. Co-current swirling air flow pattern is used in conjunction with centrifugal atomization. Generally used for producing a uniform fine powder. Dry powder can be collected partly under the chamber and the fines from the cyclone. Alternatively a single point collection under the cyclone can be provided. Can be adapted for nozzle atomization with an add-on air distributor.
The standard Tall Form Bustle construction with co-current linearized air flow pattern is sued with pressure nozzle atomization systems. The dry product is usually coarser than centrifugal disc atomized product. The bustle construction enables separation of coarse fraction below the chamber and the fines can be collected from the cyclone. This configuration is deal where fines recycle is used for product agglomeration.
A configuration consisting of Tall Form Spray Chamber with a second stage Fluid Bed Dryer is used for special applications. This configuration is used for products requiring longer drying times which cannot be provided in Spray Chamber. This occurs when a coarse product has to be dried to a very low moisture content or when the product to be dried is hygroscopic in nature.