Vibrating Fluid Bed Dryers

Vibrating fluidized bed dryers are well suited for:

  • Material that has a wide particle size distribution — fluid bed dryer vibration will help to discharge oversize particles that will not fluidize.
  • Sluggish or sticky materials.
  • Temperature sensitive materials — a sub-fluidized condition can be created to produce plug flow and eliminate burning or discoloration of individual particles.
  • Fragile materials — low amplitude fluid bed dryer vibration and reduced fluidizing velocity create a gentle bed, which causes less degradation than conventional fluid bed dryers or other mechanical dryers.

Features and benefits of vibrating fluid bed dryers:

  • Lower fluidizing velocities are required, making the fluid bed dryer system more energy efficient.
  • Easy to clean and maintain.
  • Re-circulated gas and closed-loop systems available for improved efficiency or solvent recovery.
  • Clean-in-place and fire suppression systems available as part of the vibrating fluid bed dryer, where necessary.
  • Sanitary, U.S.D.A. (3A) approved vibrating fluid bed dryer construction.

Shaking fluid bed dryer versus vibrating fluid bed dryer

At TEMA Process we use a more advanced technique, eliminating the disadvantages of a vibrating fluid bed dryer.

Vibrating fluid bed dryers

Vibrating fluid bed dryers use a large drive mechanism with the bed mounted on springs like a vibrating conveyor to move product through the dryer. The main disadvantage is that the dryer and the product are subjected to significant g-forces. These high forces typically cause friable product to break apart creating unnecessary and often unwanted fines and waste. In addition, the high g-forces will be transferred to the surrounding structures resulting in additional installation requirements, premature equipment wear, premature instrument wear and elevated noise. This causes the bed case to fracture and the drive mechanisms are subject to periodic refurbishment.

  • Difficult to control residence time
  • Products are subjected to significant g-forces
  • Premature equipment wear and premature instrument wear
  • Unnecessary and often unwanted fines and waste
  • Additional installation requirements
  • Noise

 Tema Process Shaking fluid bed dryers:

Shaking fluid bed dryers solve the high g-force issue by eliminating the need for vibration and include a more advanced control systems that eliminates the need for continuous operator involvement. Product is moved through the dryer by a gentle shaking motion, Low Frequency / High Amplitude, which moves it forward in a step by step uniform manner referred to as plug flow. The g-force issue is eliminated allowing for smallest possible product deterioration, reduced foundation requirements and minimal noise output. A shaking fluid bed dryer system typically has the lowest life cycle cost via substantial savings in fuel consumption and maintenance costs.

  • Eliminating the need for vibration
  • More advanced control systems
  • Smallest possible product deterioration
  • Minimal noise output
  • Lowest life cycle cost
  • Savings in fuel consumption and maintenance costs

Our Tema Process Shaking fluid bed dryer in action

Shaking fluid bed dryers are frequently used for the drying of raw natural minerals or pre-processed minerals. The unique TEMA Process shaking drive mechanism allows for a uniform drying result for a large spread in particle size distribution ( 110 microns – 10 mm) , without disruptions of the fluid bed. This shaking design is suitable for capacities up to 100 t/h in a single unit.

shaking fluid bed dryer

TEMA Process B.V. is a specialised manufacturer for fluidized Bed Systems for drying of minerals, chemicals, food, feed, biomass, etc. The TEMA Fluid Bed can be applied not only for drying, but also for cooling, roasting, torrefaction, puffing, blanching, stripping , spices and herbs sterilisation and pasteurisation and calcining.

TEMA Process B.V. manufactures continuous and batch fluid beds. Batch fluid beds are used when products integrity is required for example in the pharma industry or for small quantities of product. Continuous dryers / coolers can be delivered in static or dynamic (shaking, vibrating) fluid beds. Static fluid bed can be delivered with or without submerged heat exchangers.

Advantages of vibratory fluid-bed dryer systems 

  • Low energy consumption compared to other type of dryers
  • Accurate control of the residence time, product is dried uniformly
  • Gentle on sensitive materials (no friction)
  • Low operating costs
  • Cooling section integrated in dryer
  • Handling of sticky products (from centrifuges or filters)
  • Small  footprint
  • Process flexibility
  • Reliable system, less downtime

Types of Vibrating fluidized bed dryers

tema-process fluid bed dryers Shaking fluid bed

Shaking fluid bed

units for continuous operation and suitable for sticky materials with a wide particle size distribution. The shaking motion improves the fluidization and transport of any material within the fluid bed. Drying gas temperature up to 750 °C and product temperatures up to 400 °C are achieved.

fluid bed dryer unit

Fluid bed units

A fluid bed is an effective unit to thermally treat powders, crystalline products, pelletized or extruded materials. High heat and mass transfer are obtained as a result of the intimate contact between fluidizing air and product.

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Industries and examples where Fluid Bed Systems can be used for

The TEMA fluid bed systems can be used for all kind of thermal processes like : Drying, cooling, calcining, sterilizing, baking, puffing, roasting, cooking, blanching, steam stripping etc.

The TEMA Fluid Bed systems are used for drying and/or cooling of:

Mineral Industry

Fluid bed dryers are used for processing natural materials, our systems are designed to minimize energy usage, easy to maintain and operate, rigid
construction for challenging environments. The systems are used for drying, cooling, calcining, dedusting, etc

Examples:

  • Sand
  • quartz sand
  • silica sand
  • gypsum
  • slag sand
  • limestone
  • kaolin
  • potash
  • phosphates
  • coal
  • mineral ores
  • etc.
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Food and Feed Industry

Fluid bed systems are used for a wide variety of food and feed ingredients, hygienic design as requested in this industry with gentle and even drying to preserve the quality of the materials. Special executions with CIP, GMP design, increased residence time, operating with low oxygen levels are available. The systems are used for drying, cooling, roasting, expanding, removal of solvents, cooking, decontamination, deactivating, etc.

Examples:

  • Bread crumbs
  • rice
  • sugar
  • dextrose
  • herbs,
  • spices
  • flaked cereals
  • extruded cereals
  • milk powder
  • lactose
  • tomato pulp
  • citrus pulp
  • fish meal
  • fish feed
  • animal feed
  • return bread
  • etc

Chemical Industry

In the chemical industry fluid bed dryers are used to dry all kinds of crystalline materials, powders, extrudates, etc. Special care is taken to select the correct material of construction, minimize effluent to the environment, reduce energy consumption. Systems are used for drying, cooling, removal of solvents, chemical reactions, etc.

Examples:

  • Salts,
  • sodium chloride
  • herbicides
  • CMC
  • detergents
  • ammonium sulphate
  • sodium sulphate
  • potassium sulphate
  • polymers
  • PVC
  • PVDC
  • fertilizers
  • plastics
  • EPS
  • fibres
  • coopper
  • sulphate
  • metal salts
  • etc.
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fluid bed dryer manufacturer

Biomass and Waste Industry

In the biomass and waste industry fluid bed dryers are used to dry biomass materials and solid waste materials, sludges and slurries, in order to increase the heating value for biomass and alternative fuels and reduce the volume. Drying takes normally place at lower temperatures between 100 – 200 gr. C by use of waste heat from CHP or boilers.

Examples:

  • RDF
  • poultry
  • litter
  • cow dung
  • dewatered slurry
  • digester sludge
  • fermenter waste
  • lemon peel
  • orange peel
  • manure
  • paper sludge
  • wood
  • biomass
  • etc.

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