What is the drum dryer?
druchova is a rotating cylinder that uses steam or hot air to heat raw materials and reduce the moisture content during the production process. Configuration may include one or more drums. The drum dryer can use atmospheric pressure or function in the vacuum. Dry dryers have many applications in the food industry because they are very effective for drying trap or gelatin materials. The steam is forced to interior. On the outside of the drum, a thin layer of raw material is then applied. As the temperature rises, the humidity in the raw material reaches the boiling point, starts to evaporate and leaves the raw material. The dried layer of the raw material is removed from the drum with a scraper. The time of the raw material remains on the drum depending on the original moisture content and the required end content of the moisture. The range is usually between a few seconds and a half minute. The raw materials can be applied to the drum dryer of the cylinder, by immersing the lower edge of the drum into the raw material tank or spraying them on the surface of the drum.
The double drum dryer consists of two drums mounted side by side and rotates together. The raw material layer is controlled by the distance between two drums. The raw materials are applied to two drums from above. This configuration can increase production capacity.
If the raw material is subjected to excess heat, the vacuum dryer of the drum can be used. The whole drum is closed in a vacuum chamber where air can be evacuated; This reduces boiling point and drying can be done at a lower temperature. Operating vacuum systems are more expensive and more often used for higher values such as drugs.
Another type of rotary drum dryer is a double or triple pass system. In this configuration, the drums are nested inside the second. The raw material is introduced into the innermost hottest drum and is moved along with the directing of flights mounted in the interior of the drum and hot air. After the raw material loses a certain amount of moisture, the air streamIt eats on another drum, which is colder, where it continues to lose moisture. If there is a third drum, it is even cooler with a slower air stream, and thus continues to dry the drying process while protecting the raw material from heat damage.