Tray dryer

About Tray Drier.

1. TRAY DRYER

2. Content About Tray Dryer Construction of Tray dryer Working of Tray Dryer Advantages Disadvantages References

3. About Tray Dryer Tray dryer   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 Tray Dryer It consist of rectangular chamber of sheet metal containing two trucks that support racks H. Each rack carries a number of shallow trays, perhaps 750 mm 2 and 50 to 150 mm deep, that are loaded with material to be dried. 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 . Baffles G distribute the air uniformly over the stack of trays. Some moist air is continuously vented through exhaust duct B; make up fresh air enters through inlet A . 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 Tray Dryer Wet solid is loaded in to the trays and Trays are placed in the chamber. Fresh air is introduced through inlet, which passes through the heaters and gets heated up. The hot air is circulated by means of fans and then water is picked up by the air. 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. At the end of the drying trays or trucks are pulled out of the chamber and taken to a tray dumping station .

6. Advantages Tray dryer are very useful when the production rate is small. They find most frequent application for valuable products like dyes and pharmaceuticals. In the tray dryers the handling of the materials, loading and unloading of the materials can be done without losses. Energy saving is significant.

7. Disadvantages Tray dryers requires more labour to load and unload, hence increases in the cost. They are expensive to operate. 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 is used industrially in large as well as in small operations for drying the desired feed material for fulfilling our aspects.

9. References http://www.pharmainfo.net/book/pharmaceutical-machines/tray-dryer Unit operations of chemical engineering ( By Warren L. McCabe ,Julian C. Smith and Peter Harriott )/Drying of solid/Drying equipment/tray dryers