The standard static fluidized bed is composed of a plenum for gas injection, a fluidization plate for a homogeneous air distribution and a hood for product conveying and gas exhaust. Fluidization plate may be from different types : perforated sheets, porous metal, oriented air jet, nozzles, or other type depending on processes and applications. The plenum chamber is generally subdivided into several sections to provide the optimum fluidization velocity at each stage of processing. The temperature of the processing gas can be adapted for each plenum section. Final section can be a cooling zone. The behavior of the fluidized product is similar to a liquid. The processed product is discharged by overflowing an adjustable weir (typically from 0 to 300 mm). Smoke: Smoke Share on facebook Share on twitter Share on linkedin Share on whatsapp Vibrating Fluidized Bed Read more Static Fluidized Bed With Internal Heat Exchangers Read more Rotary Dryer Read more
In complement to standard static or vibrating fluidized beds, suitable to work up to 400°C, COMESSA designs also high temperature fluid beds up to 950°C. This batch fluidized bed is constituted by a metallic cylindrical reactor heated through the wall, allowing an internal controlled atmosphere, independent from heating load. The retort can be externally heated by radiation with electrical coils or by hot gases. The fluidization gas is homogeneously distributed by a special conical plate, allowing discharge of treated product through a central high temperature valve. Exhaust gases are cleaned by a filter made of sintered metal cartridges. Depending on the application and characteristics of the product, the filter can be externalized and an agitator can be added in the layer of product. Fluidization will generate an important stirring between gas and product and therefore a very homogeneous treatment. Precise temperature and process cycle can be fully automated. This kind of equipment is typically dedicated to the treatment of catalysts, even with particles below 30 microns. Direct heating or continuous processes can be alternatively proposed. Smoke: Smoke Share on facebook Share on twitter Share on linkedin Share on whatsapp Vibrating Fluidized Bed Read more Static Fluidized Bed With Internal Heat Exchangers Read more
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 Smoke: Smoke Share on facebook Share on twitter Share on linkedin Share on whatsapp Vibrating Fluidized Bed Read more