Vacuum Shelf Dryer (Tray Dryer)

Product Description

Working Principle of Vacuum Shelf Dryer

The Vacuum Shelf Dryer is basically a tray dryer working under vacuum conditions. It dries on the conduction principle. There are a number of shelves inside the dryer on which the product laden trays are placed. The top most shelf is adum my shelf to ensure proper heating and to block dried powder from escaping into the solvent extraction system.

The shelves are manufactured in hollow construction with baffles cum stiffeners placed in between. Each shelf has an inlet and outlet nozzle. Each shelf is connected through these nozzles to an Inlet and Outlet Header. Hot media is passed through the Inlet Header and in turn to each shelf. The hot media flows through the shelves in a serpentine fashion ensuring faster heat transfer to the surface, which in turn heats upthe Trays placed on the shelves. The hot media flows out from the shelves through the Outlet Header.

The Inlet and Outlet Headers are designed such that the flow of the heating media is equally distributed into the each of the shelves.

The Dryer chamber is constructed fromheavy thickness platesto ensure that there is no buckling during the vacuum operation. Additional limpet coils are provided to further stiffen the body and also to pass the hot media. The chamber is provided with a heavy door with a adequate locking arrangement.

The Dryer Chamber is connected through a vapour column to aShell & Tubetype Heat Exchanger, which in turn is connected to a Condenstate Receiver. Vacuum is applied to the condensate receiver. Vapour evolved during the drying process is collected in the receiver after it is cooled in the Heat Exchanger.

The vapour to be cooled is passed through the tube side of the Heat Exchanger. While cooling water is passed through the shell side. cooling coilis present in the condensate reciever, to further cool any vapours entering the reciever before it is goes into the vacuum pump.

The Condensate Reciever is connected to a Vacuum Trap, to ensure that any uncooled vapours arising from the reciever is trapped and allowing very minimal contents of the vapour to pass into the Vacuum Pump.