How Does a Paddle Dryer Work?
Paddle dryer can be stated as an indirect contact dryer different from a conventional dryer. It is designed for slimy, sticky, wet cake materials and various product types and processes. These processes include but are not limited to drying, heating, cooling, reacting, etc.
We at AS Engineers design these dryers with a wide range of drying potentials, from fast, accelerated drying to gentle, prolonged drying. A paddle dryer is widely used in industries such as environmental pollution control, food & drugs, and chemicals. For hyper-critical processes, we also design a vacuum-based model.
The FD blower pulls in fresh air from the atmosphere via a filtration element, preventing impurities from entering. The ambient incoming air is pushed into the tube shell heat exchanger, which heats up the air and brings it to the desired temperature via a heating medium. The used-up heating medium is then thrown out. The heated air is pushed into the paddle dryer through an air inlet to prevent the condensation of vapour.
The feed with high moisture content is dropped from the hopper into the Paddle Dryer. On the one hand, the moisture from the feed evaporates due to the heat transfer from the hollow shafts and the jacket. On the other hand, the hammers on the paddle break the feed down into smaller particles through churning and agitation. The feed’s breakdown process undergoes three phases: Plastic, Shearing, and Granular. The used-up heating medium is then discharged from the outlet of the Paddle Dryer where the dried feed gets collected and is bagged.
The mixture of powder and air is then carried towards the cyclone separator via the ID fan’s suction which gets separated and discharged through the rotary air-lock valve. A scrubber installed below continuously sprays processed water onto the mixture inside the Venturi throat, which then settles in the scrubber tank. Fresh air is then discharged from the chimney out into the atmosphere.