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.
How does a fluidized work?
Fluidization is the unit operation by which fine solids are transformed into a fluid-like state through contact with a gas. At certain gas velocities, the fluid will support the particles, giving them freedom of mobility without entrainment.
What is the difference between fluidized bed and fixed bed?
Fluidized-bed reactors offer a much higher efficiency in heat exchange, compared to fixed beds, and better temperature control, due to the turbulent gas flow and rapid circulation. At the same time, the high gas velocities do not cause any pressure drop issues and smaller catalyst particles can be employed.
What are advantages of a 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 is CFM in fluid bed dryer?
(3000-3300 cubic foot per minute (cfm)) was. excessive for the amount of material in the fluid bed. dryer. The rapid rise in the exhaust air temperature.
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).
Where are fluidised beds used?
Fluidized beds are used for several purposes, such as fluidized bed reactors (types of chemical reactors), solids separation, fluid catalytic cracking, fluidized bed combustion, heat or mass transfer or interface modification, such as applying a coating onto solid items.
Where are fluidized bed dryers used?
Fluid bed dryers, as their name suggests, are used for drying materials such as granules, tablets, powders, fertilizers, and plastics. They are particularly popular in production industries like: Chemical. Pharmaceutical.
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.