MICROWAVE VACUUM DRYING SYSTEMS AND METHOD FOR DRYING LUMPY, POWDERY, OR GRANULATED PRODUCTS BY MEANS OF MICROWAVES

摘要

The invention relates to a microwave vacuum drying system (100) for drying lumpy, powdery or granulated products (170), comprising a tubular vacuum container (110) having a product inlet (120) on one end and a product outlet (130) on the other end, and a non-metallic drum (2) for receiving and transporting the product (170) to be dried. Said drum is open on the front sides thereof, coaxially arranged in the vacuum container (110), can be rotatably driven by means of a drive, and comprises an inner surface designed such that, when the drum (2) rotates it transports the product (170) to be dried, inserted via the product inlet (120), towards the end of the vacuum container (110) comprising the product outlet (130). The invention also relates to at least one microwave generator (49) and at least one microwave injection element which is fed by the microwave generator (49) and ends inside the vacuum container (110). The invention further relates to a microwave vacuum drying system (110) comprising at least two drying stations through which drums (190-195) are guided, and to methods for drying lumpy, powdery or granulated products (170) by means of microwaves in a vacuum container (110).