Shaking fluidised bed dryer
Multotec supplies the shaking fluidised bed dryer, sourced from its sister company Tema Process . The fluidised bed dryer is a highly efficient drying system designed for various industries requiring precise and thorough thermal or physical treatment of materials. It is used in thermal treatment applications such as drying, cooling, calcining/texturisation, torrefaction, puffing, sterilisation & pasteurisation, blanching and steam stripping/inert gas drying. It is used in agglomeration and dedusting applications. The shaking fluidised bed dryer is suitable for various industries, such as minerals, chemicals, waste management, and food & feed.
This product is particularly beneficial for industries that need effective final drying processes to achieve a thoroughly dry product. In the food industry, it enhances taste, flavour, and texture. It also supports the biomass sector by improving product quality for fuel combustion and gasification. It also serves the feed industry by expanding products like rice and wheat under high temperatures to enhance their cooking properties. This product can also deactivate enzymes as well as sterilise and pasteurise spices, herbs, dried vegetables, seeds, and nuts.
Our shaking fluidised bed dryer benefits:
- Variable speed control system optimises drying performance to reduce energy costs
- High-amplitude and low-frequency shaking fluidisation helps dry abrasive materials while minimising wear and tear
- Using high-temperature resistant materials reduces energy loss and improves efficiency and productivity
- Easy maintenance access to the dryer enables a safer working environment
- Enlarged fluid bed area reduces upward velocity, allowing fine particles to return to the fluidised bed and reducing overall product loss
More about our shaking fluidised bed dryer
Our shaking fluidised bed dryer features:
- Operating temperatures up to 750 ˚C
- Static shaking fluid bed dryers and flash dryers can be used for drying products with a top size of 30 mm down to a D50 of 80 microns
- Uses various heating mediums, including air, steam or inert gas, and can be powered by natural gas, propane, biofuel or waste gases
- Exhaust system for removing particle or gas contamination such as air cyclones, scrubbers and bag filters
- High-temperature-resistant construction materials, such as stainless steel and titanium, minimise energy loss and ensure durability. This reduces maintenance and increases the dryer’s lifespan.
Product types
Our shaking fluidised bed dryer offers a range of different types of fluid beds and dryers that perform various applications depending on the material and drying requirements.
Moving fluid bed:
- Sticky and inhomogeneous/non-uniform materials
- Continuous operation
- Wide particle size distribution range
- Shaking motion improves product fluidisation and transport
- Gas temperature up to 550 °C
- Product temperature up to 400 °C
Static fluid bed:
- Gravel, fibres and pellets
- Non-sticky and homogeneous/uniform materials
- Continuous and batch operation
- Drying of uniform materials
Flash dryer:
- Fine products, short residence time
- Surface drying of products
Belt dryers:
- Pellets, agglomerates, long residence time for products not suitable for fluidisation
- 1 hour residence time
Decontamination plants
- Food products
- Reducing bacterial load through exposure to live steam in a controlled atmosphere for a short, specified period
Shaking fluidised bed dryer fundamentals
The dryer uses a series of processes that result in the efficient drying of various materials. It spreads the wet material across a perforated air distribution plate. This allows hot air to enter the fluid bed through a wind box located underneath the plate, blowing air through the perforations to lift and fluidise the wet material. This enables solid particles to move like a fluid, maximising the heat and moisture transfer between the drying air and the material.
The air velocity for drying is carefully controlled to keep the product in a fluidised condition during the drying process. Additionally, the same system can be utilised for cooling materials by allowing ambient or cooled air to enter. As the air passes through the material and removes moisture, it exits the system via a suction hood. This hood has an expanded structure to reduce the airflow speed, preventing larger particles from being carried away.
The product being dried moves through the dryer with a gentle shaking motion using low-frequency and high amplitude. This ensures a step-by-step uniform manner called the “plug flow” where the first material to enter is the first to exit. This process allows for even and controlled drying. The shaking motion enhances the fluidisation behaviour, particularly when dealing with various particle sizes. It also facilitates the effective movement of sticky or inhomogeneous materials.
How Multotec makes a difference
We provide comprehensive support for our products, backed by our in-house expertise and additional assistance from the OEM Tema Process in the Netherlands.