What is fluid bed technology?
What is fluid bed technology?
Fluid bed technology is used for cooling, heating and drying of bulk solids materials. Fluid bed heat exchange takes place by passing a gas (most commonly air) through a perforated distributor plate which then flows through a layer (bed) of solids. The air performs two functions.
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 is the principle of a fluidized bed?
The Principle of Fluidized Bed Dryer: If air is allowed to flow through a bed of solid powdered material in the upward direction with the velocity greater than the settling rate of the particles, the solid particles will be blown up and become suspended in the air stream.
What are the advantages of fluidized bed?
In fluidized bed combustion, rapid mixing ensures uniformity of temperature. The main advantage of fluidized bed combustion system is that municipal waste, sewage plant sludge, biomass, agricultural waste and other high moisture fuels can be used for heat generation.
What are the types of fluidization?
Based on different Geldart particle groups and gas velocities, several different fluidization regimes can be observed: fixed bed, homogeneous fluidization, bubbling fluidization, slugging fluidization, turbulent fluidization, and entrainment process.
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 disadvantages of fluidized bed?
Disadvantages. As in any design, the fluidized bed reactor does have its draw-backs, which any reactor designer must take into consideration. Increased reactor vessel size: Because of the expansion of the bed materials in the reactor, a larger vessel is often required than that for a packed bed reactor.
What is the principle of fluidization?
1 The principle of fluidization. Fluidization is the process of stationary solid particles brought into a dynamic “fluid-like” state by an upward stream of fluid (gas or liquid) (Fan & Zhu, 2005).