Shaking Fluid Bed Dryers design and manufacturing

Shaking fluid bed dryers are well suited for:

Material that has a wide particle size distribution — fluid bed dryer shaking 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 shaking 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 shaking 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 shaking fluid bed dryer, where necessary.
Sanitary, U.S.D.A. (3A) approved shaking 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.

TEMA Process B.V. is a specialised design and manufacturing company for Fluid 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 shaking 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 Fluid bed dryers

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 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.

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.

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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