2. Dust collectors are machines or machinery
used to combat air pollution in many
industries. They are efficient in removing
dust particles as well as polluting gasses
from the polluted air stream. A type of Dust
collector is the fabric filter type. It is
explained below.
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3. This type of filter is known as the bag-
houses or the fabric collectors. They
use the above for the collection of dust
and filtration. In this category the most
efficient and the most cost effective dust
collectors available have more than
99% collection efficiency.
These polluted gases enter the stream
and pass through the filter bags that
act as the filters. These bags stop the
particulate matter and the air is let
through. These are made up of
materials like felted cotton, synthetic, or
glass-fiber material in either a tube or
the envelope.
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4. Pre-coating:
All the filter bags to ensure that they have a
better longevity are coated with a pre-coat or
filter enhancement. The use of the chemical
inert limestone is the most common amongst all
and is of maximum efficiency of the dust
collection part. This is done using the formation
of what is known as the dust cake or coating on
the surface of filter medium. This place not only
provides protection but also provides a barrier to
the bag from the moisture, oily and sticky
particles and much more. If the pre-coating is
not present the bag will allow the small and tiny
particles to pass through. Thus applying pre-coat
enhances the ability of fabric filter.
Parts of the bag houses or fabric filters:
Clean plenum, Dusty Plenum, bag, cage,
venture assembly, tube plate, RAV/SCREW,
Compressed air header, Blow pipe, a housing
and a hopper.
The parts and specifications of
the fabric filters are:
5. • Shaking: This method uses the movement of the bag
connected by a rod. As the rod moves the particulate
matter is shaken. This shaking is dependent on the type
of motor used. When shaken the dust particles fall out.
During this process no polluted air flows through the
chamber.
• Reverse air: It uses the principle of reverse air flow
through the bag. This happens when the polluted air flow
is stopped and then when the bags are relaxed the
reverse air is send. This reverse air throws out all the
dust particles out of the bag.
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