Boiler Accessories

Multicyclone Dust Collector

The flue gases coming out of the boiler contains dust particle’s embedded in it.
The pollution control board of a particular area has limitation on the concentration of dust particles in the gases which are to be release from boiler to the atmosphere.
In order to minimize this dust content from the flue gases dust collector system is being used.

Position:

Structure:

The main structure due to which the separation takes place is a pipe in pipe construction.
The inner pipe is supported by means of guide vanes ( crates ) on the outer pipes.
The lower side of the outer pipe is tapered downwards.
The entire assembly is covered by the outer casing which is 4 to 5 mm thick.
This assembly is then supported on the support angles.
Two duct openings are placed on the flue gas inlet and outlet sides with flanges.

Working :

The dust collector works on the centrifugal action.
The dust gas stream from the boiler enters at an angle in the outer pipe and is spun rapidly downwards causing the centrifugal action to take place.
From the lower cone the speed of the gases increases and dust particles being heavier are collected at the bottom of the dust collector.
The gases from the bottom turn and travel through inner pipe in the upward direction and are then released out.

Factors to be considered while selecting a dust collector

Dust concentration and particle size
Degree of dust collection required :
a. The degree of dust collection depends upon its potential as a health hazard, location of plant, the allowable emission rate, the nature of dust etc.
b. The selection of dust collector should be based upon the efficiency required and should consider the need for higher efficiency.
Characteristic of dust : Moderate to heavy concentration of many dusts can be Abrasive to dry centrifugal collectors. Sticky material can adhere to collector elements and plug passages
Methods of disposal.
Gas Volume.
Ducting size.

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