Fluid Bed Dryers
Fluid bed dryers are used for drying various types of materials such as fertilizers, chemicals, powders, granules, and tablets. Fluid bed dryers work on the principle of fluidization.
Fluidization is a process in which hot air or hot gas is introduced into the spaces between solid particles. Velocity of hot air introduced from the bottom of the dryer increase the upward forces on the particles and particles enter into a state of suspension. This phenomenon, a boiling bed of solid particles, is called as fluidization.
Fluid bed dryers work on the principle of fluidization. Fluidization is a process in which hot air or hot gas is introduced into the spaces between solid particles. Velocity of hot air introduced from the bottom of the dryer increase the upward forces on the particles and particles enter into a state of suspension. This phenomenon, a boiling bed of solid particles, is called as fluidization.
When a perfect fluid bed is established, each particle is surrounded by hot air and heat exchange efficiency between air and particles is maximized. This makes fluid bed dryers one of the most efficient drying technologies.
Fluid bed dryers are extensively used in industries such as chemical, food, metallurgical, dairy, pharmaceutical, aggregates and many other process industries.
We are specialized on continuous flow fluid bed dryers. We have got 2 types of continuous fluid bed dryers in our portfolio:
- Vibrating Fluid Bed Dryers
- Shaking Fluid Bed Dryers
Our engineers carefully select the appropriate type of dryer based on the application data and customer request.
Fluid bed dryers have many advantages against other types of industrial drying technologies.
- High energy efficiency, minimum thermal energy requirement
- Flexible process control capabilities
- Easy maintenance, low operating cost
- Precise control of retention time and drying temperature
Rotary dryers are extensively used in various process applications which require heavy duty and reliable equipment. If your process requires high drying temperatures or you have wide fluctuations in throughput or particle size, then a rotary dryer will be the most appropriate equipment for your goals.
There are two types of rotary dryers: Directly heated and indirectly heated dryers.
The directly heated rotary dryer operates on the principle of lifting, tumbling, and moving forward the product through a rotating tube in which a hot gas stream is pushed either in parallel or counter-flow direction. Particles which are lifted encounter with the hot gas stream maximizing the heat exchange surfaces and thus resulting in evaporation of water.
In indirect dryers, rotating drum is heated from the outside and therefore there is no contact between the particles and the drying gas or air. Indirect dryers are usually heated via a stationary jacket which is equipped with multiple burners or an external heat source such as steam.
Advantages of rotary dryers are:
- Robust construction, long service life
- Low cost of capital investment compared to other drying technologies
- High drying temperatures applicable if process requires
Belt dryers are usually preferred when residual or waste heat is available. Thanks to their large drying area and long retention time, belt dryers are suitable to utilize any available waste heat and use it for drying materials at low temperatures.
Belt dryers can be designed in various ways to adapt the needs of drying goals. These dryers can be used to dry a wide range of materials such as wood chips, RDF, maize, cereals, biomass, and sewage sludge.
Belt dryers usually consist of a drying tunnel and an endless belt conveyor which is located inside the tunnel. Solids are evenly distributed on the belt and moved forward very slowly through the drying tunnel. Hot air (waste or residual heat from an existing process or air heated via heat exchangers or a burner) is drawn into the tunnel and circulated through the belt and wet particles. Dry material is discharged at the other end of the drying tunnel.
Advantages of belt dryers are:
- Available for a wide range of drying capacity from 500 kg/h up to 10 tonnes/hour evaporation
- Optimization of footprint thanks to multiple belt design
- Low temperature drying, utilization of waste heat, low operation cost
- Fully automatic process control
- Easy inspection of process, easy maintenance