Objective
This article explains the working principle, parts, advantages, and industrial applications of the Fluidized Bed Dryer (FBD) manufactured by Shree Bhagwati, a leading name in pharmaceutical and industrial process equipment. The objective is to help readers understand how fluidization enhances drying efficiency, energy savings, and product quality in various industries such as pharmaceuticals, chemicals, food, fertilizers, and more.
Introduction: Efficient Drying Through Fluidization
Drying is a critical unit operation in many industrial processes — particularly in pharmaceutical, chemical, and food industries — where product stability, quality, and consistency depend on the removal of moisture under controlled conditions.
The Fluidized Bed Dryer (FBD) by Shree Bhagwati is an innovative drying system that provides rapid, uniform, and energy-efficient drying of granules, powders, and crystals.
Compared to traditional dryers, such as tray or rotary dryers, an FBD ensures superior heat and mass transfer, shorter drying times, and improved end-product quality.
By integrating modern automation (PLC/HMI control) with robust engineering, Shree Bhagwati’s FBD offers precision, safety, and efficiency — making it an indispensable tool for modern process industries.
Machine General Layout for Fluid bed Coater/ Processor / Multipurpose .
Lab Model Fluid Bed Coater / Processor / Fluid bed dryer – 2 kg to 20 kg batch sizes.
Rapid Mixer Granulator / High Speed Mixer and Granulator / High Shear Mixer Granulator
Fluid Bed Coater(Bottom Spray) 60 /120/ 250/ 500 kegs batch size.
High Shear Mixer Granulator with Co Mill , Vacuum powder Transfer systems , Fluid bed processor / Glatt Fluid Bed Processor /coaters.
High Shear Mixer Granulator with Co mill
What is a Fluidized Bed Dryer?
A Fluidized Bed Dryer (FBD) is a type of industrial drying equipment used to reduce the moisture content of granular and powdered materials by suspending them in a stream of hot air.
It’s called “fluidized” because, under proper airflow, solid particles behave like a fluid — moving, colliding, and mixing uniformly in the drying chamber.
This phenomenon ensures maximum surface contact between the drying air and the material, resulting in faster drying with minimal energy loss.
Where It’s Used
Fluidized Bed Dryers are extensively used in:
- Pharmaceuticals: Drying wet granules before compression in tablet manufacturing.
- Chemicals: Removing moisture from intermediate or final chemical powders.
- Food Industry: Drying cereals, chips, spices, and powders.
- Fertilizers: Drying inorganic and organic fertilizer granules.
- Agricultural & Feed Industry: Drying seeds, animal feed, and organic matter.
Understanding Fluidization
Fluidization refers to the process of making solid particles act like a liquid by suspending them in a fast-moving air or gas stream.
In this state:
- The particles move freely and uniformly.
- Continuous mixing enhances heat and mass transfer.
- The bed of solids behaves dynamically like a boiling liquid.
Thus, a Fluidized Bed Dryer enables uniform drying, consistent temperature distribution, and high energy utilization efficiency.
Working Principle of Fluidized Bed Dryer
The Fluidized Bed Dryer works on the principle of fluidization, where heated air is passed upward through a perforated plate at a controlled velocity.
When the air velocity reaches a critical point, the solid particles lift and suspend in the air stream — creating a fluidized state.
Process Flow: Step-by-Step
- Air Inlet and Heating:
Ambient air is drawn into the system using a blower and heated via an electric heater or steam heat exchanger. - Air Distribution:
The heated air passes through a perforated air distributor plate, ensuring even air flow and uniform fluidization of the material. - Fluidization:
The material bed becomes fluidized — particles are suspended and agitated by the air stream. Each particle is surrounded by hot air, ensuring maximum surface exposure. - Drying Phase:
As moisture evaporates from the material surface, the warm air carries it away through an exhaust system equipped with filters. - Cooling and Discharge:
Once the desired moisture level is achieved, the material moves into a cooling zone before final discharge, ensuring uniform dryness and stability. - Dust Recovery & Exhaust:
Fine particles are retained by filter bags, and clean air is released through the exhaust.
This fluidization process enables rapid and uniform drying without overheating or degrading the product — even with temperature-sensitive materials.
Main Parts of Fluidized Bed Dryer
Each Shree Bhagwati FBD is precisely engineered with components that ensure uniform airflow, efficient heat exchange, and safe operation.
Part Name | Function |
1. Product Container (Bowl) | Holds the wet granules or powder to be dried. |
2. Perforated Air Distributor Plate | Distributes hot air evenly and supports the product bed. |
3. Blower Unit | Generates required air velocity for fluidization. |
4. Heater / Heat Exchanger | Heats the air to the desired temperature for drying. |
5. Air Handling Unit (AHU) | Filters, heats, and conditions the incoming air. |
6. Filter Bags / Finger Bags | Prevent product loss by capturing fine particles. |
7. Exhaust System | Removes moist air and maintains pressure balance. |
8. Control Panel / PLC with HMI | Enables automatic operation, monitoring, and data logging. |
9. Temperature Sensors (Inlet & Outlet) | Monitor and control air temperature for consistent drying. |
The integration of these parts ensures controlled, repeatable, and efficient drying cycles every time.
Shree Bhagwati’s Fluid Bed Equipment Range
Shree Bhagwati manufactures a complete range of Fluid Bed Equipment (FBE) designed for drying, granulation, and coating applications.
- Fluid Bed Dryer / Processor / Coater / Granulator
Available in multiple capacities — from 20 kg to 1000 kg batch size for industrial use. - Lab Model FBD:
2 kg to 20 kg batch size for research, R&D, and pilot trials. - Fluid Bed Coater (Bottom Spray):
Available in 60, 120, 250, and 500 kg configurations. - High Shear Mixer Granulator with Co-Mill and Vacuum Powder Transfer System:
For integrated granulation and drying applications.
This wide product range ensures scalability from laboratory development to large-scale commercial production.
Available Fluid Bed Dryer Models
Model | Container Volume (L) | Capacity (kg/batch) |
Laboratory FBD | 10 L | — |
FBD-300 | 300 L | 45 – 135 kg |
FBD-400 | 400 L | 60 – 180 kg |
FBD-600 | 600 L | 90 – 270 kg |
FBD-1200 | 1200 L | 200 – 600 kg |
FBD-1800 | 1800 L | 300 – 800 kg |
All models feature stainless-steel construction, CIP-friendly design, and compliance with GMP and CE standards.
Advantages of Fluidized Bed Dryer
The Fluidized Bed Dryer by Shree Bhagwati combines scientific design with automation for superior drying performance and operational ease.
Key Benefits
- Rapid Drying:
Reduces drying time to just 20–40 minutes, boosting productivity. - Uniform Drying:
Prevents hot spots and ensures consistent product quality across the batch. - Improved Product Quality:
Enhances granule porosity, flowability, and compressibility. - Energy Efficiency:
High heat and mass transfer rates reduce overall energy consumption. - Low Maintenance:
Minimal moving parts lead to lower wear and easy cleaning. - Safe for Heat-Sensitive Materials:
Operates at moderate temperatures (~60°C) without direct contact with hot surfaces. - High Containment:
Enclosed operation minimizes dust and contamination. - Ease of Operation:
PLC-based controls with touchscreen HMI simplify monitoring and process automation. - Sampling & Observation Ports:
Allow real-time inspection and process validation.
Additional Technical Advantages
- High thermal efficiency with internal heat exchangers
- Gentle product handling due to short residence time
- Easy scale-up from lab models to production systems
- Low capital and operating costs compared to rotary dryers
Applications of Fluidized Bed Dryers in Industry
Pharmaceutical Industry:
Used for drying wet granules, powders, and intermediates before compression in tablet manufacturing or capsule filling.
Food Industry:
Drying food products like cereals, spices, milk powder, and snack items for extended shelf life.
Fertilizer Industry:
Drying inorganic and organic fertilizers such as NPK compounds and urea-based products.
Chemical Industry:
Used in dye, pigment, resin, and fine chemical drying processes.
Agricultural & Feed Industry:
Drying seeds, animal feed, and organic waste efficiently.
Cyclonic Flow Air Distribution Plate
- Provides tangential and cycloidal airflow for uniform drying and agglomeration.
- Eliminates dutch weave mesh breakage, reducing product contamination.
- Benefits include:
- Energy savings due to cyclonic airflow
- Superior top and bottom spray agglomeration
- Eliminates raking or rat-holing of material
- Reduced filter loading (air doesn’t flow vertically to the filter)
- High exit air velocity prevents material sticking even when wet
- Efficient wet mass loading from Rapid Mixer Granulator (RMG) due to cyclonic flow during charging
21 CFR Part 11 Compliance Features
- Ensures maximum security and data integrity
- Features:
- Unique user IDs and passwords
- Clear audit trails with automatic timestamps
- Electronic signatures and secure password policies
- Unlimited user accounts and recipe storage
- Full audit trail and batch report generation
Fluid Bed Coater (Wurster Coating)
- Enables bottom spray pallet coating via adjustable Wurster columns with spray guns.
- Available as a combo model supporting drying, top spray, and bottom spray coating in a single machine.
High-Pressure Design with Explosion Isolation
- Designed for high pressure resistance (up to 12 bar).
- Features thicker SS sheet and 20mm thick window glass for durability.
- Uses explosion isolation valves (inlet and outlet) instead of a conventional explosion flap.
- In case of explosion, valves close to contain explosion inside the retardation chamber, protecting operators and equipment.
Enhanced Processing by Shree Bhagwati Group
- Uniform distribution of formulation ingredients
- Short drying and processing time
- Useful working capacity from 40% to 80% of bowl volume
- Continuous material movement for uniform drying
- Wide application range
- Easy scale up and scale down between machine sizes
- Bowl design eliminates dead spaces
Automation and Control Features
- Minimizes human intervention for consistent product quality
- Generates audit trail, batch reports, alarm history, all printable
- Machine won’t restart automatically after power loss; manual restart only
- Recipe and parameter storage with protection against data loss
- Suitable data storage provisions for operational recipe data
Built-in Safety Features
- Broken filter bag detector / Solid flow monitor halts machine on particle detection in exhaust
- Antistatic finger bags
- Proximity sensors ensure bowl is properly fixed before operation
- Rounded corners for operator safety
- Emergency stop button
- Pressure switch for incoming air low-pressure detection
- Explosion flap protects operators from dust-air mixture explosions
- Temperature sensors for inlet air, product, and outlet air
- Standard earthing probe
- Warning signs on electrical panels
- Blower stops if filter bag gasket air pressure drops below set value
- Blower stops if product container gasket pressure drops below set value
Clean In Process (CIP) System
- Two high-speed rotating nozzles spray water in main chamber
- Multiple solenoid valves control three wash media in sequence (PLC-controlled or manual)
- Requires nearby connections for three types of water supply
- Sample port at discharge allows water sample collection for lab testing
- Audible buzzer indicates sampling time during drain cycle
- Thorough cleaning of bowl and discharge assembly via rotating nozzles and plenum sprays
Advanced Particle & Pellet Coating
- Bottom spray technique to apply coatings that enhance:
- Storage stability
- Hygroscopicity
- Flow properties
- Solubility and sustained release
- Appearance, taste, and odor
- Controlled movement of particles through a hollow cylinder ensures uniform coating and avoids agglomeration.
Salient Features of Bhagwati FBD Systems
- cGMP-compliant design
- Inflatable silicon rubber tube filter bag fittings
- Pneumatically operated gaskets for airtight sealing
- Multi-stage filtration: 20 micron washable filter → 5 micron pre-filter → 0.3 micron HEPA filter
- SS backward curved centrifugal blower
- Auto temperature controller for steam radiator
- Infinitely variable airflow damper
- Online sampling device
- Pneumatic raking option
- Allen Bradley PLC automation with keyboard, display, and printer
- Dished end and tapered bottom for efficient discharge
- Positive earthing with low voltage relay
- Explosion flap made from aluminum
- Noise isolation ‘Through the Wall’ design
- Precise air conditioning system with heaters and bypass
- Safety rims (C-type half round) around product container
- Optional SS316 cartridge filters with blow-back cleaning system
Pneumatic Control System
- Spray gun inlet and cleaning pressures monitored via PLC with air pressure indicators
- Product chamber and bowl locating switches with inflatable gaskets for sealing
- Differential pressure monitoring on product bottom mesh, HEPA filter, pre-filter, and outlet exhaust filter
Agglomeration & Granulation Process
- Fluidized powder wetted with binder via top spray guns
- Binder creates liquid bridges between particles, producing uniform granules without segregation
- Gentle granule formation due to lack of impinging force results in porous, dust-free granules
- Ideal for effervescent and free-flowing granules with good dispersibility and solubility
- Granules have low bulk density and broad particle size distribution
| MODEL | FLUID BED DRYER 15 | FLUID BED DRYER 30 | FLUID BED DRYER 60 | FLUID BED DRYER 120 | FLUID BED DRYER 200 | FLUID BED DRYER 250 | FLUID BED DRYER 300 |
| Container Vol : Litres | 50 | 100 | 220 | 430 | 590 | 780 | 950 |
| Batch Capacity : Kgs | 15-20 | 30-40 | 60-75 | 120-140 | 200-225 | 250-280 | 300-330 |
| Heating Load : KW for Electrical Heating | 9 | 18 | 36 | 54 | Electric Heating Not Recommended | ||
| Motor H.P. | 3 | 5 | 10 | 15 | 20 | 25 | 30 |
| Drying Temp oC | 50-80 | 50-80 | 50-80 | 50-80 | 50-80 | 50-80 | 50-80 |
| Approx. Steam Consumption Kgs/Hr (Steam Pressure 3 Kg/cm2) | 15 | 25 | 50 | 100 | 160 | 200 | 250 |
Higher Model 1500Liter & 2000 Liter please email to us your requirement .
Shree Bhagwati is offers fluid bed machines series : Small Mini Lab model Fluid Bed Dryer, Mini Fluid bed granulation, Lab model Glatt Fluid Bed Processor machine , FBD – Fluid Bed Dryer Granulator and Coater machine, FBG – Fluid Bed Dryer Granulation equipment and cGMP – US-FDA stander FG Fluid-Bed Dryer with PLC touch screen and SCADA base operating systems capacity 10 kg to 1000 kg batch.
Conclusion
The Fluidized Bed Dryer (FBD) by Shree Bhagwati represents a blend of precision engineering, automation, and process efficiency. Its ability to achieve rapid, uniform, and energy-efficient drying makes it a preferred choice across industries — from pharmaceuticals to fertilizers.
Those looking to buy fluid bed dryer for drying powders, mixing or agglomeration processes can find some of the best models in required specifications at Bhagwati Machtech. Shree Bhagwati Machtech is a leading machinery supplier in India offering high quality and reliable fluid bed dryers for mixing of dry powders, agglomeration and drying applications. Visit https://www.bhagwatipharma.com to know in detail about the company offering the best fluid bed dryers for industrial processes.
SHREE BHAGWATI fluid bed dryer range is best suitable cGMP, USFDA and CE standard compliant fluid bed dryer / processor / coater and granulation machine designed to uniformly and quick effectively dry powder and granules. our equipment With a multi-function capability available, We offered our fluidized bed dryer with top spray systems for granulating, bottom spray unit for coating and specially spray pelleting or coating systems .
Director
Darshan Rao represents the new generation of leadership at Shree Bhagwati. As Director, he is committed to driving innovation, operational excellence, and growth across all facets of the company. With a focus on fostering strong relationships with stakeholders, partners, and clients, he leads a team of dedicated professionals in delivering high-quality manufacturing solutions.
One of his key strengths lies in pressure management—a crucial quality in the fast-paced and dynamic manufacturing industry. He firmly believes in turning challenges into opportunities and using adversity as a catalyst for growth and innovation.
To embark on this journey together, he invites you to join hands with Shree Bhagwati in pursuit of excellence, embracing innovation, and setting new benchmarks in manufacturing. Together, let us create a success story defined by integrity, ingenuity, and an unwavering commitment to quality.
