FabriCleanTM
Pulse-Jet Fabric Filters
FabriCleanTM
Pulse-Jet Fabric Filters
Pollution control legislation throughout the
world is becoming more stringent and
higher standards of collection efficiency
and reliability are demanded across the
whole range of power, process and
manufacturing industries.
F.L.Smidth Airtech FabriCleanTM
Pulse-Jet Fabric Filters are used
throughout industry on a wide range of
applications. They provide sound technical
and commercially attractive solutions on
processes which demand high collection
efficiencies with related low dust emissions.
These filters require an absolute minimum
of attention and maintenance.
Installations range from a small
single compartment unit up to multicompartment systems operating as part of
a complex, total gas cleaning plant often
involving other types of pollution control
devices.
Use of the FabriCleanTM Filter gives
many benefits
Optimised gas flow distribution
system.
Multi-compartment concept allows
flexibility of system design.
Use of standard components
minimises costs.
Improved Filter Bag and Cage
design.
Venturi fitted to Bag Cage
enhances pulse cleaning.
SmartPulse ControllerTM system
reduces power consumption.
Easy access for filter bag change
and inspection.
Operating temperatures up
to 250 0C
Reference plants in excess of
1,000,000 m3 per hour.
Continuous improvements from
the Barrier Filtration Technology
Centre.
The FabriCleanTM Filter is part of the
F.L.Smidth Airtech range of pollution
Control equipment which also includes
Ceramic Filters, Dry and Wet Type
Electrostatic Precipitators, Precipitator
Control Systems and Acid Gas Scrubbers
and Absorbers.
Design Features
HIGH EFFICIENCY
Dust collection efficiencies of greater
than 99.9% are readily attained with careful
selection of filter media and operating
parameters. Novel design of the inlet duct
permits high inlet dust loading with only a
moderate pressure loss.
CONTINUOUS OPERATION
Automatic, effective bag cleaning using
pulsed air, microprocessor controllers,
on-line" or "off-line" cleaning to suit
application requirements, "on-line"
maintenance option on multicompartment units, high plant availability.
EASY MAINTENANCE
Walk-in, weatherproof weather enclosure,
no internal moving parts, minimum bag
wear, simple bag change, generous
access.
COMPACT LAYOUT
Flexible modular design, high integrity
construction, minimum ground space,
short lead time.
Plant Components
The FabriCleanTM system comprises
individual compartments, inlet and outlet
flue gas duets, isolation valves, pulsed
cleaning system, access facilities, support
steel, process and instrument controls
and dust removal equipment.
F.L.Smidth Airtech will also supply other
components such as fans, process ducting,
coolers, dust transport and storage silos
and sorbent injection systems at the clients
request.
Gas Distribution
The high performance of the FabriCleanTM
Filter is achieved by careful design of the
gas flow distribution system. Dirty gas
enters the inlet duet from the process and
flows through the inlet valves into the
individual compartments containing the
filter bags. Baffles and deflector plates
ensure that most of the dust is deposited
directly into the hoppers, reducing the dust
burden to the filter bags. This
results in a significant decrease in the
amount of pulse air required to clean the
filter bags, so achieving lower power
Gas distribution screen
Cleveland Waste Managements' Energy from Waste
plant in England with fabric filters supplied by
F.L.Smidth Airtech
The FabriCleanTM Pulse-Jet
Fabric Filter System
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Inlet duct
Top box lid
Outlet damper
Inlet damper
Outlet duct
Hoist
Weather enclosure
Purge tubes and venturies
Compressed air manifold
10.
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Casing
Hopper heating
Distribution screen
Insulation
Screw conveyor
Support
Stair case tower
Bags and cages
Air sluice
3
High efficiency
gas/dust distribution
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Raw gas inlet 15-18 m/sec
Inlet to compartment
Dust extraction
Gas is distributed and goes through distribution screen
Dust down flow between bags
Clean side of filter
Clean gas outlet
Collected dust
Dust drop out
Gas/dust distribution
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6
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Raw gas inlet
Clean gas outlet
Guide vanes
Dust drop out
Baffle plates (One of more options)
Distribution screen (Shown schematic)
Collected dust
Dalmacija, Sveti Kajo, Croatia.
Convertion from Electrostatic Precipitator
to Fabric Filter
consumption and extended bag life.
A further series of baffles ensure even
distribution of the partially cleaned gas to
the bags which are suspended from a tube
sheet, separating the dirty" and "clean"
sides of the filter. Under suction generated
by the induced draft fan, flue gases are
drawn through the filter bags with the
particulate being retained on the outer
surface. A rigid wire cage is installed inside
the bag to prevent its collapse. The
cleaned flue gas passes through the open
top of the filter bags into the cleaned air
chamber and then exits the filter through
the outlet valves and cleaned air duet.
Pulsed Cleaning System
The build-up of particulate on the outside
surfaces of the bags creates a dust cake
increasing resistance to gas flow,
resulting in an increase in pressure drop,
and must be removed periodically by the
bag cleaning mechanism.
Each row of bags in a compartment is
individually pulsed with compressed air
delivered through a solenoid actuated
diaphragm valve.
Energisation of the valve allows
compressed air from a manifold to flow
rapidly into the attached purge tubes and
through the holes that are positioned over
the venturis on the bags. This
instantaneous surge of compressed air
creates a shock wave which goes down
through the bags causing the fabric to snap
away from the support cage, dislodging the
dust cake. The cleaning of each row is
carried out in a fraction of a second,
allowing the filtering operation to continue
without interruption. The dislodged dust
cake falls into the hopper from where it is
extracted.
This type of operation is called "online" cleaning, i.e. all the rows of bags are in
operation except the specific row being
cleaned.
Rawang, Malaysia, Fabric Filter for a clinker
cooler.
Compartment Isolation
Some processes or customers'
specifications require the need for "offline" cleaning. In this case the outlet
isolation valves to a compartment are
closed, isolating it from the gas flow whilst
a cleaning cycle is initiated, cleaning each
row of bags in turn within the isolated
compartment. After completion of the
compartment cleaning, the outlet valves
are opened and the compartment goes
back into operation.
Some clients require very high plant
availability and hence the need to carry out
maintenance whilst the plant is "on- line".
Both the inlet and outlet isolation valves of
a compartment are closed and locked
manually allowing safe access for
maintenance, bag inspection, bag change,
etc, whilst the other compartments remain
"on-line". Once completed the valves are
opened and the compartment returned to
operation.
Valve operation is fully automatic and is
controlled from the filter control
microprocessor control system.
Cimpor Souselas, Portugal. Fabric Filter
for a cement kiln
The dust dislodged from the filter bags
is deposited in a hopper located under
each compartment. Pyramid or trough type
hoppers are provided as appropriate to the
application and operation. They can be
trace heated and supplied with agitation
equipment to ensure effective discharge.
Collected dust is removed via seal valves,
screw or drag link conveyors, depending
on the type of dust being handled or
client's own requirements.
Weather enclosure
An optional fully weatherproofed, walk-in to
weather enclosure can be provided covering
the entire top area of the fabric filter. This
enables all inspection, maintenance, etc., to be
carried out sheltered from the elements.
Casing, Hoppers and Supports
The FabriCleanTM filter units including the
casing, bag support cell plate and
hoppers, are constructed from steel plate,
stiffened and sealed to withstand at least
5,000 Pa. More onerous conditions can
be catered for by increased stiffening.
Internal division plates are also
stiffened to withstand the differential
pressure when one compartment is open
for maintenance / inspection or in "offline" cleaning mode.
Inside a weather enclosure
Filter Bags and Cages
Filter bags are normally 127 or 150 mm
(5 or 6) diameter and are available in
lengths of 2.5, 3, 3.5, 4, 5, and 6 meters.
Filter bags are sealed into the tube
sheet using a snap band and are
reinforced at the top and bottom to prevent
wear. The fabric used is selected from the
wide range available, by our experienced
technologists, to meet the process needs
and to withstand the process operating
conditions. Full details are provided in our
project quotations.
For ease of assembly and subsequent
removal of long filter bags, the wire cage
can be split into two sections using our
proprietary centre fixing.
On the top (clean side) of the tube
sheet the bag cage extends to hold a
Advances in filter bag materials can give
emission levels of less than 5mgINm3.
Laboratory tests
venturi which fits directly under the pulsed
air outlet hole on the purge tube.
Access to purge tubes, venturis, cages
and bags is through an access cover
located in the floor of the top housing.
SmartPulse ControllerTM Fabric
Filter Optimisation System
Different types of bag material
On large fabric filters once the main
design parameters such as flow
distribution, filtration velocity and cloth
type have been selected, the major
contributing factor to power
SMART PULSE CONTROLLER
consumption, compressed air usage and
bag life, is the operation of the pulsed
cleaning system.
The FabriCleanTM Filter is supplied with
the SmartPulse ControllerTM which in
addition to operating the normal pulsing
system has many innovative features for
performance monitoring and Control.
One of the outstanding additions to
normal Control is the automatic
diagnostic feature which will look at pulse
duration, interval and pressure with relation
to filter differential pressure and
automatically adjust these parameters to
give the best use of compressed air and fan
power ensuring the most efficient pulsing is
achieved.
Research and Development
Pilo units and large scale bag filter models
are constructed as part of the continuous
research and development programme
undertaken by F.L.Smidth Airtech .
Positive results are incorporated within the
standard fabric filter design to optimise gas
and dust flows. Improvements will reduce
dust re-entrainment, pressure drop, bag
wear and pulse air cleaning requirements.
Easy Maintenance
Maintenance, Bag Removal, and
Replacement
Access to bags, cages, purge tubes and
venturis is from the cleaned gas side of the
filter through the top cover of each
compartment.
A runway beam and hoist is provided to
lift the opened top cover clear of the floor
and move it aside. This provides safe and
easy access to the compartment
purge tubes and the tube sheet area.
The bag, cage and venturi assemblies
are mounted on the tube sheet and no
special tools are required for removal and
subsequent replacement.
Maintenance time is reduced to a
minimum and a bag/cage assembly can be
removed by one person in 2 to 3 minutes.
There are no moving parts inside the
gas chamber or above the tube sheet.
Applications and Experience
Its reliability, versatility and cost
effectiveness has won universal
acceptance for the FabriCleanTM Pulse-Jet
Fabric Filter across a very wide range of
industrial processes that produce dry dust
that has to be removed from the gas
stream. Principal applications areas are:
Cement - Plastics Production
Minerals - Metallurgical Processes
Food and Dairy Industry - Foundries
Iron and Steel Production
Power Generation - solid fuel boilers
Energy from Waste plants refuse and biomass incinerators
Clinical Waste incinerators
Fabric Filters are often the principal
item of gas cleaning equipment in a
particular process but they can also form
part of a total gas cleaning equipment plant
involving Acid Gas Scrubbers where the
Fabric Filter can be used as a
supplementary reactor providing a high
level of reaction as well as particulate
removal.
F.L.Smidth Airtech offer a
comprehensive range of gas cleaning
equipment for all the major industrial
processes.
Bag, cage and venturi assembly is easily removed
and replaced.
Their range includes Dry and Wet type
Electrostatic Precipitators, Acid Gas
Scrubbers, Semi-Dry and Wet Absorbers,
Fabric Filters and Ceramic Filters. Whether
you require a simple flange-to- flange dust
collector or a turnkey installation, we can
provide a complete service. Our scope
covers the complete design, manufacture,
supply, site erection, commissioning and
testing of the most suitable plant for any
given application.
F.L.Smidth Airtech also offer an
inspection and maintenance service
together with plant refurbishment and
performance upgrade if this is required.
This includes conversion of existing air
pollution control equipment to the
FabriCleanTM Pulse-Jet Fabric Filter.
F.L.Smidth Airtech equipment is custom designed to contract specifications. Equipment
performance will be as established in each contract, and may not be as generalised in
this brochure.
TM
FabriClean and SmartPulse Controller
member of F.L.Smidth Airtech group
TM
are trademarks of Lodge Sturtevant Limited a
Focus on Site Activities
The FabricCleanTM Pulse-Jet Fabric Filter has been
designed for quick and easy construction and
commissioning.
Pre-erected and pre- insolated casing
Where it is practical pre-tested / pre-assembled
units are used to ensure quick construction and
eliminate unnecessary time spent on fault finding.
By this method any fault will be discovered at an
early stage so a proper correction can be
implemented.
The filter can be delivered to site in panel form
(Flat-Pack) or in pre-assembled modules
appropriate to transport, site location and
restrictions.
To reduce construction time the casing and
hoppers can be pre-assembled and insulated on
ground level and lifted into its final position on the
support. This will also reduce the extent of
scaffolding.
Pre-erected hoppers and topboxes
The SmartPulse control system is delivered to site
in pre-cabled control boxes for easy erection and
commissioning. This significantly reduces the
electrical work on site as these cables represent
approx. 75 % off all cables on the filter top.
Pre-erected weather enclosure
SmartPulse control system
F.L.Smidth Airtech
Ramsingsvej 30, DK-2500
Valby
Copenhagen, Denmark
Tel.+45-3618 2000
Fax.+45-3618 2030
E-mail: info@flsairtech.com
www.flsairtech.com
