What is fluidized bed reactor used for?

Fluidized bed reactors are widely used in material processing industries for processes that require good heat and mass transfer between particles and a gas. The energy provided to the fluidized bed typically comes from the warm gas that fluidizes the bed as well.

What is fluidized bed process?

A fluidized bed is a physical phenomenon occurring when a quantity of a solid particulate substance (usually present in a holding vessel) is placed under appropriate conditions to cause a solid/fluid mixture to behave as a fluid. The resulting phenomenon is called fluidization.

What are the characteristics of fluidized bed reactors?

The distinguishing feature of a fluidized bed reactor is that the bed of solid particles or catalyst is supported by an upflow of gas. This reactor provides easy loading and removal of catalyst. This is advantageous when the solids bed must be removed and replaced frequently.

What are the types of fluidized bed?

There are two main types of fluidized bed gasification systems—bubbling fluidized bed and CFB. Depending on the scale of operation, the cyclone separators for capture and recycling of solid particles could be placed either internally or externally.

What are the applications of fluidization?

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.

What is the minimum fluidization velocity?

The minimum fluidization velocity (Umf), defined as the superficial gas velocity at which the drag force of the upward moving gas becomes equal to the weight of the particles in the bed, is one of the most important parameters associated with a fluidized bed system.

How do you calculate fluidization?

dp = the diameter for spherical particles or the nominal diameter for irregular-shaped particles; ρ = the density of the fluid; ρh = the hudraulic density of the solid; g = the gravity acceleration constant, 9.81 m2/cm; μ = the dynamic viscosity of the fluid; εmf = the minimum fluidization voidage; umf = the minimum …

Which is the best description of a fluidized bed reactor?

For other topics on fluidization, see Fluidized bed technology, Fluidized bed combustion and Fluidization. A fluidized bed reactor ( FBR) is a type of reactor device that can be used to carry out a variety of multiphase chemical reactions.

When was the annular fluidized bed conceptualised?

Finally in the early 1990s annular fluidised beds was conceptualised and its current uses are: A general Annular Fluidized Bed (AFB) introduces gas at high speeds that enter the reactor from the bottom of the large central nozzle and additional fluidized gas is introduced through an annular nozzle ring.

Why are hot spots avoided in a fluidized reactor?

Local hot or cold spots within the reaction bed, often a problem in packed beds, are avoided in a fluidized situation such as an FBR. In other reactor types, these local temperature differences, especially hotspots, can result in product degradation.

Which is the best description of a fluidized bed?

For other topics on fluidization, see Fluidized bed combustion, Fluidized bed reactor, Fluidized bed concentrator, and Fluidisation.

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What is fluidized bed reactor used for? Fluidized bed reactors are widely used in material processing industries for processes that require good heat and mass transfer between particles and a gas. The energy provided to the fluidized bed typically comes from the warm gas that fluidizes the bed as well. What is fluidized bed process?…