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Fluid Bed Dryer / Fluidized bed dryer

Fluid Bed Dryer / Fluidized bed dryer :

Fluidized bed dryer (also called fluid bed dryer) is a kind of equipment used extensively in the pharmaceutical industries to reduce the moisture content of pharmaceutical powder and granules. Drying is very much important for wet granules for compression into the tablet and for modifying the characteristics of viscous and sticky materials. Drying is commonly the last step in unit process before compression into tablet form and packaging.

Principle :

Fluidized bed dryer is better known by name because hot air (gas) or ambient air is allowed to flow upward at high pressure through a perforated bottom of vessel containing bed of particulate solids or wet granules. The velocity of hot air is more than the settling velocity of the granules/particles by which they remain suspended in stream of hot air. This condition is called fluidized state. The hot air surrounds every granule/particle and completely dries them.

Construction :

Two types of FBD are available, vertical and horizontal which are made up of stainless steel or plastic. Vertical type is used for batch drying and horizontal is used for continuous drying. A detachable vessel is placed at the bottom of dryer for loading and unloading of material. This vessel has perforated mesh through which hot air with high pressure is passed. Bag filters are placed above the vessel for collection of dried material.

Working : 

The material to be dried is placed in detachable vessel at bottom of the dryer. The air is introduced from below through the prefilter, which is heated by means of heaters installed therein. Simultaneously fan is also allowed to work. As the velocity of air is increased, the bed begins to expand and further increase causes turbulent motion of particles called fluidization.

The granules/particles remain suspended in air stream. Later on, a state of pressure is reached at which frictional drag on the granules/particles is equal to the force of gravity. The particles rise in stream of air due to high velocity of gas, this condition is called fluidised state.

Bag filters :

These are placed above the drying vessel for the recovery of particles and dried material.  Various features of theses filter bags are:

  1. These are made of different types of material or fabrics- cotton, nylon, polyester, satin, polypropylene.
  2. These can bear high pressure of hot air or high flow rates
  3. Durable construction
  4. Good resistance to wear and abrasion
  5. These are available in different pore sizes, thickness, fabrics, permeability.
  6. Anti-static fabrics are also available.
  7. These are available in different sizes which can easily fit in equipment.

Advantages of fluidized bed dryer:

  1. Thermal efficiency is 2-8 times than tray drier
  2. It is available in different sizes having drying capacity in range of 5- 250 kg/hour.
  3. Free flowing granules/particles are made.
  4. It can also be used for mixing the material with high efficiency.
  5. It can be used for both batch and continuous drying.
  6. Loading and unloading of material is very easy due to detachable vessel
  7. Higher drying temperatures than tray and truck dryer.

• Tri level filtration using: 20 micron for Pre Air filtration 5 micron for Secondary Air filtration 0.3 micron for Final Air filtration through HEPA
• Air Dehumidification on special demand.
• Inlet / Outlet dampers have proportional control valve.
• Proportional control temp controller.
• Inlet / Exhaust Location: Several alternatives to suit customer requirements.
• Wash in place
• Control: By PLC monitor with printer as optional.
• Specially designed explosion flaps.
• Intrinsically safe system of earthling with low voltage.
• Steam radiator In SS to SS construction.
• Inflatable Silicon Seals used in the system.
• 2 Pneumatic Cylinders 1 for the Bag Up and Down movement and the other for Impact Bag Shaking..
• Complete SS 304 Ducting for Air Exhaust.
• Specially designed Broken Bag Detector.
• Double skinned SS 304 AHU with a built in Face and By Pass.
• Specially designed anti-static and anti-sparking blower.
• High static high efficiency blower installed.
• Completely Tool less AHU.
• Strategically mounted observation windows provided for viewing drying operation.
• Flush Sampling port provided for extracting small quantities of coated product during operations.

• Capacity available from 2.5 kgs. to 300 kgs.

Description BF – 30 BF – 60 BF – 120 BF – 200 BF – 250 BF – 300
Capacity of Dryer in Kgs at 0.6 Kg / Ltrs bulk density 30 -50 50 – 70 120 – 150 200 – 220 250 – 270 300 – 320
Working capacity of Product Container in Ltrs 50 100 200 335 420 500
Total Volume of Product Container in Ltrs 100 200 420 650 800 1000
Blower Motor HP 5 10 15 20 25 30
Heater Load K.W. 18 36 54
Steam Consumption in Kgs / hr 25 55 110 180 240 330
Width 1000 1300 1710 2000 2000 2000
Length 2040 2300 2480 3970 3200 3200
Height 2585 2950 3650 3800 4100 4100

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