What is a fluid bed?

Fluid bed is a mixture of solid particles along with gas, liquid or air, which is often released from under. The mixture generally behaves as a liquid under the pressure of any media during the process. Usually flowing like a fluid with gravity can also be suspended substance with liquid pumps. Coal power plants often use such fluid material for efficient heat transfer and control of pollution and the process is sometimes used to harass objects in food production and processing. The fluid bed reactor was first developed in the 1920s and used for industrial purposes in the 1960s. Air and liquids can also be forced from under a container container. There is usually a distribution board at the bottom, which has a number of holes from which the liquid flows to hang the mixture. The minimum fluidation point is the speed at which the weight of the solid substance can be suspended.

speed depends on the required pressureon a suspended substance and on particle size. There are four general size -based groups developed in the 70s, called Geldart Grouping. The circulation fluid bed usually adds a lot of energy to the liquid, helping to suspend relatively large particles. The grains can then be separated by size. Other variations include a stationary bed that usually has a constant flow of fluid; and vibrating fluid beds for mechanically handling particles.

bed systems are often used in coal -fired power plants. The mixture of coal and gas allows combustion at temperatures lower than what usually leads to nitrogen oxide release. Pollurations of sulfur can also be captured and such a system also allows coal more efficiently. It is also possible to burn munepative waste in this way, as the system is generally effective in burning and maintaining pollutants.

Depending on the design, a fluid bed can be used for metal coating. The boiling powder and air mixture can be spread outBelt on a metal immersed in the chamber. Foods such as chopped vegetables are often frozen when they are placed in a cryogenic mixture before they are packed and sent. The freezing process can be accelerated due to contact between pieces of suspended food and frozen air or compound in the chamber.