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Tray dryer
Tray dryers are used to dry wet solid materials like pharmaceuticals and chemicals. They consist of rectangular chambers containing racks that hold shallow trays loaded with the wet material. Heated air is circulated between the trays by fans and vents out moist air while pulling in fresh air. The trays are loaded with wet material and the heated air picks up water as it passes through in a single pass. Once dried, the trays or racks are removed and the dried material unloaded. Tray dryers are useful for small batch production of valuable materials but require more labor and have longer drying cycles than other dryers.
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Introduction to tray dryer, its construction, working mechanism, advantages, disadvantages, and references.
Tray dryer is used for drying wet products like crude drugs, chemicals, and powders that do not require agitation.
Consists of a rectangular metal chamber with racks supporting trays, heated air circulation, and exhaust systems.
Describes the loading of wet solids, heating through fresh air, and the circulation process for drying.
Suitable for small production rates, valuable products, efficient handling, and significant energy savings.
Requires more labor, expensive operation, and longer drying cycles ranging from 3 to 48 hours.
Tray dryers are used for various industrial drying applications effectively.
List of online resources and textbooks referencing tray dryers and their operations.
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Tray dryer
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- 2. Content 1. About TrayDryer 2. Construction of Tray dryer 3. Working of Tray Dryer 4. Advantages 5. Disadvantages 6. References
- 3. About Tray Dryer Traydryer is the device which is used for drying of the wet products of the crude drugs, chemicals, powders or the granules etc. The material which needs to agitate, are not dried in tray dryer.
- 4. Construction of TrayDryer 1. It consist of rectangular chamber of sheet metal containing two trucks that support racks H. 2. Each rack carries a number of shallow trays, perhaps 750 mm2 and 50 to 150 mm deep, that are loaded with material to be dried. 3. Heated air is circulated at 2 to 5 m/s b/w the trays by fan C and motor D and passes over heaters E. 4. Baffles G distribute the air uniformly over the stack of trays. 5. Some moist air is continuously vented through exhaust duct B; make up fresh air enters through inlet A. 6. The racks are mounted on truck wheel I, so that the end of the drying cycle the truck can be pulled out of the chamber and taken to a tray-dumping station.
- 5. Working Of TrayDryer 1. Wet solid is loaded in to the trays and Trays are placed in the chamber. 2. Fresh air is introduced through inlet, which passes through the heaters and gets heated up. 3. The hot air is circulated by means of fans and then water is picked up by the air. 4. These events occur in a single pass of air. The time of contact is short and amount of water picked up in a single pass is small. 5. At the end of the drying trays or trucks are pulled out of the chamber and taken to a tray dumping station.
- 6. Advantages 1. Tray dryerare very useful when the production rate is small. 2. They find most frequent application for valuable products like dyes and pharmaceuticals. 3. In the tray dryers the handling of the materials, loading and unloading of the materials can be done without losses. 4. Energy saving is significant.
- 7. Disadvantages 1. Tray dryersrequires more labour to load and unload, hence increases in the cost. 2. They are expensive to operate. 3. Drying by circulation of air across stationary layer of solid is slow, and drying cycles are long : 3 to 48hour per batch.
- 8. Conclusion Tray drier isused industrially in large as well as in small operations for drying the desired feed material for fulfilling our aspects.
- 9. References 1. http://www.pharmainfo.net/book/pharmaceutical-machines/tray-dryer 2. Unitoperations of chemical engineering (By Warren L. McCabe ,Julian C. Smith and Peter Harriott )/Drying of solid/Drying equipment/tray dryers