KILBURN manufactures Fluid Bed Dryers and Coolers in technical collaboration with M/s. NARA MACHINERY COMPANY, JAPAN, the world leader in this field.These dryers/coolers utilize the FLUIDIZED BED TECHNIQUE to effectively dry many chemical, petrochemical, and other products.
Fluidized bed technique is most effectively utilized in a number of heat and mass transfer applications like:
“KILBURN, in more than 39 YEARS, has DESIGNED, MANUFACTURED, SUPPLIED & INSTALLED more than 50 CUSTOMIZED FLUIDIZED BED DRYERS for VARIOUS APPLICATIONS”
Fluid means a liquid. A substance is said to be fluidized when it starts behaving like a liquid. When a determined quantity of air is passed below a perforated bed, carrying the substance to be dried, say PVC, the material starts bubbling and it behaves like a fluid. Much depends upon the substance, its moisture content, size of perforations, and air flow.
When the air velocity is low, the bed of solids remains still. As the air velocity increases, the particles on the upper part of the static bed begin to move and separate from one another.
When the air velocity is further increased . all the particles begin to float The particulate bed is expanded and the movement of particles become an active formation of a mixture of air and particles. This gas solid mixture is called “Fluidised Bed”
When the air velocity through the fluidized bed is increased further, the particles bubble more and more vigorously, and some of the particles begin to gradually fly-off. When the air velocity exceeds the terminal velocity of the particles, all of the particles may be blown-off resulting in “Carry Over”.
Plenum Chamber of Fluid Bed Dryer
- Intimate contact of hot air and solids result in high heat transfer co-efficient. This makes the drying system compact
- High operating temperatures possible because of rapid heat and mass transfer rates.
- No overheating of heat sensitive products because of special constructional features.
- Unique and thermally efficient design of embedded Heat Exchanger.
- Lower capital costs.
- Easy control of residence time & simple to adjust moisture content of dried product.
- Easy handling of feed and product. No Moving parts, stabilized operation and negligible maintenance.
OF FLUID-BED DRYER
Assembled Fluid Bed Dryer
Fluid Bed Dryer Heat Exchanger Tube
A) Continuous Fluid Bed Dryer –
The distributor plate is fixed at the bottom of a rectangular chamber. Hot air is passed through the Distributor Plate and wet material is fed continuously in a fixed quantity and distributed by a disperse. The air velocity can be varied as desired.After lapse of designed residence time, the dried product is continuously discharged at the overflow outlets. The exhaust air is vented out after being processed through a dust separation system.
Salient Features :
1.Operation can be easily controlled by adjusting feed and temperature of hot air, based on the product temperature at the outlet.
2.Over and under flow features provide uniform drying of small and large size particles.
3.Wet feed is mixed with semi-dried product in the chamber; hence products with higher moisture content can also be fluidized and dried.
4.The drying chamber can be partitioned by baffle plates resulting in more uniform drying.
B) Continuous Fluid Bed Dryer With Built-In Heat Exchanger
This type of Fluid Bed Dryer provides heat from two sources to the product -one by hot air and the other by immersed heat exchanger tubes inside the bed. This improves the heat transfer co-efficient and decreases the air quantity required for drying by 50% to 70%. The equipment also becomes extremely compact. Thermally it is the most efficient Fluid Bed Dryer. The construction is similar to that of continuous type Fluid Bed Dryer but the drying chamber has a special construction in respect of mounting heat exchanger tubes in the fluidisation area. These specially designed tubes do not hinder fluidisation of the particles, but promote heat transfer.
o Polypropylene DABS
o Synthetic Resins & Polymers
o Chemicals& Fertilisers
o Pharmaceuticals& Food stuff.
PILOT PLANT TESTS
Design of a commercial size Fluid Bed System is not just heat & mass transfer calculations or sizing it’s an art! Pilot plant tests.experience and field data are important for designing an optimized Fluid Bed System for continuous application
Consideration of fluidization velocity operating temperature, particle size distribution, drying characteristic of material, distributor plate, bed height and dedusting system require pilot plant tests.
KILBURN Engineering Limited has a full-fledged Test Centre, where exhaustive facilities are available for Pilot Plant Tests. All variable parameters can be adjusted to study the drying characteristics of a substance and thereby determine values of important parameters. This data is further supplemented with empirical and actual field data
TYPICAL INDUSTRIES & APPLICATION
• Potassium Chloride
• Ammonium Bromide
• Ammonium Sulphate
• Aluminium Fluoride
• Fumed Silica
• Soda Ash
• Carbon Black
• Common Salt
• Citric Acid
• ABS Resin
• Ammonium Nitrate
• Ammonium Sulphate
• Ammonium Nitro Phosphate
• Calcium Ammonium Nitrate
• Ammonium Bromide