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Bag Filter Reverse Pulse Type HRFC/PJBF
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| A view of Bagfilter Reverse
Type HRFC |
The Reverse Pulse HRFC
Bag Filter is a high ratio filter for a large range of gas flow
and is suitable for collection of all type of dry dust. In its standard
design, the Bag Filter can withstand a pressure of ± 2500 mm WG. The Type
PJBF Bag Filter can be supplied for any quantity of gas with in-line
and off-line cleaning system.
Important Features
- High collecting efficiency-emission level of below 150 mg/m³
can be easily achieved for both coarse and fine dust.
- Has an in-built precollector thus permitting high concentration
of dust in the inlet air.
- Small dimensions.
- Has effective pulsed jet cleaning of the bags-controlled through
a solid state electronic controller.
- Can be equipped with bags in a variety of materials for special
operating conditions.
- Available with both 1.8 m and 3 m long bags, or any other size as
per requirement.
- Can be supplied without hopper and support for direct mounting on
silos.
- To minimise the space requirements, HRFC/PJBF can be supplied with
pleated bags of international standard.
Design
The Reverse
Pulse HRFC has cylindrical filters casing with a Cyclone inlet and a
conical dust hopper. The main components are shown in the figure.
The filter
is provided with two gas outlets, one of which is blanked off when delivered.
The bags
are supported on the inside with wire bag cages. Removal and fitting
of bags are done from inside of the filter casing in case of round type
construction, and from top of filter in case of rectangular construction.
A grating is provided in the bottom of the filter casing to facilitate
changing of bags. The discharge of the collected dust can be continuous
through a Rotary Feeder or intermittent through a dust discharge valve.
The Bag Filter type HRFC is available
in six nominal sizes namely 16, 21, 32, 45, 64 and 83 with either 1.8
m or 3 m bags. The type PJBF is designed to suit the requirements of
the customer.
Principle of Operation
The dust
laden air/gas enters through the cyclonic inlet where the coarse dust
is collected and falls in the hopper (see figure). The finer particles
are carried with the air/gas stream and are deposited on the outside
of the bag surface (6) and the clean air goes out through the outlet
section. The pressure drop across the bags is indicated in a manometer.
The air pressure in the compressed air tank (5) is used as an input
signal for the electronic controller to operate the program cleaning
sequence.
For cleaning
of bags, the controller operates a solenoid valve (4) which opens and
one row of bags (6) is cleaned with a short, powerful burst of compressed
air. After a short period the next valve is activated and the bag cleaning
procedure is repeated.
Pleated Bags
By using Pleated bags, the extraction
capacity of the filter unit would be more than double. In other words
for specific extraction capacity the area requirement of pleated bags
is less than half and thus very compact. Details of pleated bags may
be given on request.
Unit Bag Filter Reverse Pulse Type
INDVENT
Unit Filter Type - M(RP) is designed for continuous
duty process application requiring handling capacity for air volume
ranging from 600 C.M./hrs. Units are compact, self contained with automatic
reverse jet cleaning system. Units are available in 6 Sq.M. filter fabric
area, made with non weaven needle felts horizontally stackled, flat
bags & suitable for all type of dust. It can filter high dust durdens
at high speed and almost at constant resistance. Filteration efficiency
depending on other factors can be better than even 99.9%. Small quantity
of external compressed air supply is required for reverse jet cleaning.
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