Vacuum belt dryer
Liquid products are uniformly distributed on the belts with swivel feeders.
Free flowing powders, granules and products of larger sizes are conveyed into a hopper on top of vacuum belt dryer. By interval the product is fed into an intermediate chamber under vacuum from where the product will be loaded onto the top belt by a special rotary dosing system.
Liquid or pasty products will be conveyed through the dryer with in parallel operating belts. Solid products are transported back and forward through the dryer from the top to the bottom belt in order to extend the residence time.
The heating plates underneath the belts are installed in independent heated zones to permit constant or variable drying rates. This allows gentle continuous drying for maximum product quality. The last zone can be designed as a cooling zone if required.
At the end of the belt the dried product is cut to the desired size by a guillotine type breaker bar and a crushing device. The product is collected in an intermediate hopper from where it is discharged out of the vacuum into the atmospheric environment with alternating pressures. The removed vapours are recovered in a condenser. The vacuum is maintained usually by liquid ring pumps and single or multistage steam jets.