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ANDRITZ Gouda paddle dryer - producing quality products with high efficiency
The machine has a heated through, containing rotating heated paddle shafts. The specially shaped paddles do not have a transport function but are designed for maximum heat transfer. This results in an excellent control of the temperature of the product and enables a uniform product quality. At the outlet side, the product moves out of the machine via an adjustable overflow.
Environment
- Industrial sludge
- Municipal sludge
- Drilling mud
- Paper sludge
- Biomass
- Digested manure
Chemicals
- Polymers (PET, SAP, PA)
- Gypsum
- Minerals
- Metal powders
Food
- Milk
- Starch
- Cocao
- Flour
- Sugar
There are many ways to dry products, but two things are essential: enough heat to evaporate liquid and a means of removing the vapor.
A direct dryer uses hot air flow for both functions. Usually a lot of heat is wasted in the exhaust – and a lot of dust is created and consequent foul smelling - requiring expensive equipment for removal. Solvent recovery can be a problem too.
An indirect dryer avoids all these problems: air flows, where present at all, are negligible. Moreover, a fully enclosed operation enables the safe treatment of toxic, noxious and/or flammable products.
The ANDRITZ Gouda paddle dryer is a compact machine. That is because it has many square meters of heat exchanging surface relative to the volume. Two hollow shafts with hollow paddles turn in opposite directions in the horizontal trough. The trough has an ω- (omega) shape that follows the contours of the paddles.
Moving parts are crucial for the system. They have been expertly designed. Excellent heat transfer is ensured when the product is refreshed regularly and remains in good contact with the heat exchanging surface. The paddles of the ANDRITZ Gouda paddle dryer play a large role in creating these optimal conditions. The uniquely shaped paddle has a self-cleaning capacity. The wedge-shaped paddle produces shear forces on the paddle surface and this keeps the paddle clean and contributes to a higher heat transfer.
As the product moves through the machine, the paddles ensure that the product is well mixed and that it flows easily through the machine. The paddles give excellent mixing in radial direction. The product is not mixed in axial direction. As it moves further into the machine, the product increasingly meets the end specifications with preservation of the plug flow. An even flow (plug flow) through the machine gives each product particle a more or less identical retention time and ensures a high uniform end-product.