What is fluidisation used for?
Typical food processing applications of fluidization include freezing and cooling , drying, puffing, freeze drying , spray drying, classification and blanching and cooking. These processes involve heat and mass transfer to or from the food material, which can be rapidly achieved from fluidization.
Where are fluidised beds used in industry?
The industrial fluidized bed process ranges from simple applications like drying, cooling, pneumatic transport of powders, etc. to more complex chemical reactors such as FCC for oil cracking, CVD coating of solids in a fluidized bed, combustion or gasification of coal or biomass, etc.
Why are fluidized beds used?
In fluidised beds, the contact of the solid particles with the fluidisation medium (a gas or a liquid) is greatly enhanced when compared to packed beds. This behavior in fluidised combustion beds enables good thermal transport inside the system and good heat transfer between the bed and its container.
What are advantages of a fluidized bed?
The advantages of fluidized bed drying include low investment and maintenance costs, large-scale continuous production, lower air temperatures than spray drying and a relatively short drying time compared to freeze drying and vacuum drying (Bayrock and Ingledew, 1997).
Why are fluidized bed systems more efficient?
7.3. Fluidized bed reactors are more efficient because the feedstock input and bio-oil production are continuous. Fluidized bed reactors also use a heat carrier composed of small inorganic particles that are very efficient in providing high heat-transfer rates with uniform bed temperatures.
What are the conditions for fluidization?
Fluidized Bed Freezers In freezing, fluidization occurs when particles of a similar shape and size are subjected to an upward stream of low-temperature air. At certain air velocities, particles float in the airstream, with each particle be separated from the other but surrounded by air and free to move.