STATIC & VIBRATING FLUIDIZED BED

PRINCIPLE OF STATIC FLUIDIZED BED:
The fluidization is a state of dynamic balance of a divided solid in an ascending moving gas. It confers hydraulic properties to solids (angle of repose equal to zero, easy spreading, total filling of a receiver in which the product is fluidized). Such method of bringing in contact a solid with a gas, allows high mass and heat transfers. Mechanical energy transferred by gas to the particles is low enough to prevent attrition. Crystals for instance will remain bright and will keep sharp edges.

ADVANTAGES OF THIS TECHNOLOGY:

• Controlled residence time allowing uniform treatment;
• Low attrition of particles;
• High thermal efficiency;
• Preservation of physical and biological properties of fragile products;
• Simple and robust equipment (no mechanical device);
• Low maintenance;
• Easy cleaning;
• Multiple processing in one single equipment;
• Possibility to process under controlled atmosphere in a closed loop (i.e. nitrogen, hydrogen, etc.);
• Adjustable fines removal ratio.

MAIN APPLICATIONS:
All kind of powders, crystals, beads, granules for all industries (chemical, food, mineral, etc).

MAIN PROCESSES:
Drying, cooling, calcining, reaction, roasting, reduction, dehydration, solvent removal, etc.

PILOT TEST LABORATORY:
For determination of fluid bed parameters and possibility to perform semi industrial tests or rental of a complete pilot unit.

COMESSA CAN PROPOSE DIFFERENT TYPES OF FLUIDIZED BEDS:

• Static fluidized bed;
• Static fluidized bed with internal heat exchangers.

----
PRINCIPLE OF VIBRATING FLUIDIZED BED:
Fluidization confers to a divided solid the properties of a fluid. Products with a wide particle size distribution or including large particles, cannot be processed in a static fluidization equipment. It is the same for products discharged from centrifuges which are sticky or include lumps and which will not permit treatment by direct fluidization. Comessa developed the vibrating fluidized bed to solve most of these delicate drying problems. In such case, vibration insures a better fluidization and allows transport of largest particles or lumps.

ADVANTAGES OF THIS TECHNOLOGY:

• Handling of sticky products (from centrifuges or filters);
• Breaking soft lumps eventually formed during process;
• Adapted to a wide particle size distribution;
• Uniform product temperature, moisture and treatment;
• Low attrition of particles;
• High evaporation rate;
• Reduced footprint and simplified layout;
• Easy adjustment (residence time, temperature, airflows);
• Multiple processing in one single equipment;
• Adjustable fines removal ratio.

MAIN APPLICATIONS:
All kind of powders, crystals, beads, granules for all industries (chemical, food, mineral, etc.).

MAIN PROCESSES:
Drying, cooling, calcining, reaction, roasting, dehydration, solvent removal, etc.

PILOT TEST LABORATORY:
For determination of vibrating fluid bed parameters and possibility to perform semi industrial tests or rental of a complete pilot unit.

COMESSA CAN PROPOSE DIFFERENT TYPES OF VIBRATING FLUIDIZED BEDS:

• Vibrations generated by unbalanced motors;
• Vibrations generated by an exciter.

https://comessa.fr/pdf/Static-Fluidizied-Bed-BD.pdf ; https://comessa.fr/pdf/Vibrating-Fluidizied-Bed-BD.pdf