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Dust Collectors,Inertial

Inertial Separators

Inertial separators separate dust from gas streams using a combination of forces, such as centrifugal, gravitational, and inertial. These forces move the dust to an area where the forces exerted by the gas stream are minimal. The separated dust is moved by gravity into a hopper, where it is temporarily stored.

The three primary types of inertial separators are:

*Settling Dust Collectors  
Settling collectors separate dust from the dusty air stream by using a settling chamber (a large box) in ductwork carrying dusty air. When the dust filled air stream enters the large settling chamber its speed come down considerably owing to the sudden increase in size of its passage. Heavier dust particles settle out due to gravity from the slow air stream and are collected.  
* Baffle Dust Collectors  
Baffle collectors have a baffle plate (a flat plate) in the path of the dust filled air stream to slow it down. The air stream strikes the baffle plate and undergoes a sudden change in direction. The air stream flow and the baffle are designed in a way that the stream is first forced in a downward direction, followed by an upward 180 degree turn. With such abrupt changes in direction, the air flow slows down sharply. The heavier dust particles either strike the baffle plates due to their inertia or settle out by gravity when the flow slows down and slide into the hopper where they are collected. As they collect, the larger dust particles mop up the finer particles that escape the action of gravity and inertia, and improve the overall efficiency.  
* Centrifugal Dust Collectors  
Cyclones (or centrifugal collectors) create a ‘cyclonic’ or centrifugal force, similar to water going down a drain, to separate dust from the polluted air stream. The centrifugal force is created when dust filled air enters the top of the cylindrical collector at an angle and is spun rapidly downward in a vortex (similar to a whirlpool action). As the air flow moves in a circular fashion downward, heavier dust particles are thrown against the walls of the collector, collect, and slide down into the hopper.  



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