Download pdf - Presentation of Pulse Jet Fabric Filter FabriCleanTMpratikmuhendislik.com/download/FabricFilterFabriClean.pdfAxial fan is also offered to ventilate the weather enclosure. Return to

Pulse Jet Fabric Filter FabriCleanTM 1May 7, 2010

Edition EMB Rev 13

Presentation ofPulse Jet Fabric Filter

FabriCleanTM

General FF schematic layout


FabriClean UniClean PulseClean

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FabriCleanSide entry with gas/dust distributionDown flow in bag zoneSplit into compartmentsDesigned for use of long bags (6-8 m)Used in power boilers, mineral industry, waste incineration etc.Low pressure cleaningSemi compartment offline cleaning

UniCleanBottom entry to compartmentsUp flow in bag zoneBig pre-seperation effect incorporatedAct as one compartmentDesigned for use of bags up to approx. 4.5 m For processes with high dust load or where on-line maintenance is not required

PulseCleanBottom entry to compartmentsUp flow in bag zoneSplit into compartmentsDesigned for use of bags up to approx 4.5 m Used in the mineral industry, waste incineration etc.Semi compartment offline cleaning


Modest space requirements

Unique gas/dust distribution system

Modern control system to control cleaning

Auxiliary equipment

Designed to meet the most stringent emission requirement

Designed to accommodate long life time of filter media

Low steel weight

Easy maintenance

Highlights

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General layout The FF consists of a number of groups

Outlet damper

Weather enclosure

Top box

Outlet duct

Casing

Dust removal systems

InsulationBags and cages

Gas distribution

Access

Inlet damper

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Construction

Inlet duct

Cleaning principle(Needle Felt Bag & Glass Bag)

Hopper

Control system

Site photos

Highlights

FF types

Support

References


Details of gas/dust distribution

Inlet duct

Outlet duct

Outlet damper

Inlet damper

Guide vane

Distribution screen

6

54

2

3

1

7

8

9

1 Gas inlet ( 15-18 m/sec)2 Inlet to compartment3 Dust extraction

4 Gas is distributed and goesthrough distribution screen

5 Dust down flow between bags

6 Clean side of filter7 Gas outlet8 Collected dust9 Dust drop out

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Gas/dust distribution

Distribution screen(Shown schematic)

Distribution screen(Shown schematic)

Clean gas outlet

Raw gas with dust inlet

Guide vanes

Dust drop out

Baffle plate(One of more options)

Distribution screen Type T

Collected dust

Dust drop out

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Dust laden gas enters the inlet duct from the process equipment and flows through the inlet damper into the individual compartments containing the filter bags. The gas velocity is lowered significantly in the gas distribution chamber, therefore a big part of the dust will drop out directly into the hopper reducing the dust burden on the filter bags.The direction in the gas distribution chamber is upward and baffle plates ensure a uniform flow across the distribution screen.

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Dust plane

Distribution types


Gas distribution Types

Type I

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Type LType T


Cleaning principle Needle Felt Bag

Dust fallout

Purge air

Raw gas with dust

Clean gas outlet

Filter bag

Cage

Filter bag

Cage

Clean gas outlet

Filter cake

Venturi

Tube sheet Tube sheet

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Filtration phase

Bag cleaning phase

Primary purge air

Secondary purge air

Unique function

12 pieces

250

Glass Bag


Cleaning principle Glass Bag

Dust fallout

Purge air

Raw gas with dust

Clean gas outlet

Filter bag

Cage

Filter bag

Cage

Clean gas outlet

Filter cake

Venturi

Tube sheet Tube sheet

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Filtration phase

Bag cleaning phase

Primary purge air

Secondary purge air

Unique function

16 pieces

150

Needle Felt Bag


Bags

Cages Returnto layout

Snap ring

Installation

Temperature limits o C

A: PTFE needle felt

B: PPS needle felt

C: Wowen glass with e-PTFE membrane

D: Polyimide needle felt

E: Polyester needle felt

F: m-Aramid needle felt

G: Pan 125

Typical bag material

260

190

260

240

150

200

Each filter bag incorporates a stainless steel snap ring sewn into the top of the bag which, when fitted, locates securely in the tube sheet effecting a seal.

Bags pre-erected with cagesUp to 8 m bag design

A

BC

D EF

G

Correct bag/cage fit isEssential for long bag life

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Cleaning princp.


Cages

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Cleaning princp.

To support the fabric of the bag a mild steel wire (or stainless steel) cage is provided. The cage is designed to support the fabric evenly and restrict flexing and abrasion of the filter bag whilst allowing optimum dust release at the time of cleaning. The cage will be without joints as standard, but can be offered with a split joint if required.Each cage consists of 10 to 16 vertical wires, depending of the choice of the fabric, evenly spaced about its’ circumference which are, in turn, attached to horizontal bracing rings placed at appropriate intervals along its’ length.

Divided cages

Cages with venturis

Bags

A feature of each cage is a venturi, a spun section, located at the top of the cage, designed to enhance the pulse cleaning of the filter bag.

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Different styles of surfaceprotection are available.(Epoxi, galvanising)

Cages up to 10 m bag design

Cage forNeedle Felt Bag

Cage forGlass Bag

Venturis


Top box Tube sheet

Filter wall

Venturi

Cage

Filter bags

Tube sheet127 or 150 mm

175 mm

175

mm

170 mm

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Cleaning princp.

Minimum 4 mm thickness

Stiffened to reduce distortion

Precision cut holes

Mild or stainless steel

Tube sheet

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Casing

Top box

Side panel

Division wall

Gable panel

Inlet duct

Support beam

The complete filter casing will normally be fabricated from 5 mm mild steel, stiffened internally and externally by rolled steel sections and tubes to withstand the gas pressure, wind loads and the earthquake zone if required.

Outlet duct

Parallel typeSingle type

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Top box Assembly

Compressed air manifold

Diaphragm valve

Insulation lid

Top box lid

Lifting eye

Venturis

Purge tubes

Tube sheet

Soft glass fibregasket

Tob box examples

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Designed for efficient thermalinsulation to prevent corrosionin the top box.

Top box types

Pulse Jet Fabric Filter FabriCleanTM 15May 7, 2010Return

to layoutReturn to

Top box assembly

Single type

Double type

Outlet damper

Outlet damper

Top box Types


Quality proprietary valves used

38 mm minimum size

Easily accessed and maintained

Air actuated diaphragm valvesCompressed air manifold

Returnto top box assembly

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The compressed air manifolds for each compartment will be fitted with 1 pressure switch (CE marked if required) to monitor the correct performance of the diaphragm valves. When the diaphragm valves are activated the pressure in the compressed air manifolds is detected to identify that the valve open and closes correctly. The signals from the compressed air pressure switches are wired into the local filter controller.

Top box


to top box assembly

Top boxes during construction

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Top box


to top box assembly

Purge tubes

Each purge tube has nozzles in the form of small holes positioned concentrically over the venturi of each cage/bag assembly.

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Purge tube easy on/off slip on connection

Purge tube

Top box


Hopper Pyramid type

Level indicator

Pneumatic hammer(Optional)

Thermo sensor

Insulation

Heating element

Air heated area

Inspection hatch

Hammering edge

Bottom with heated area (Optional)

Longitudinal hopper

Hoppers with air heated area

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Hopper Longitudinal type

Level indicator

Insulation

Heating element

Air heated area

Inspection hatch

Hammering edge or Pneumatic hammer(Optional)

Bottom with heated area (Optional)

Pyramid hopper

Hopper with heating area

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Weather enclosure

Hoist

If the filter is located outdoor a weather enclosure is often provided to facilitate good conditions for inspection and replacing of the filter bags.The enclosure can be offered either designed for use of single piece cages or split cages.Axial fan is also offered to ventilate the weather enclosure.

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Natural ventilation


Dampers

Pneumatic actuator

Mechanical safety lock

Double inlet damper

Outlet dampers with three blades

Pneumatic actuator

Limit switch

Mechanical safety lock

NB:The damper leak rate is less than 1 % Returnto layout


Control system

Associated process plant can be controlled if required

Communication with plant control systems if required

Compressed air manifold pressure

Valve operation

Compartment emission

Filter control system

Plant control system

Filter pressure drop

Auxiliary equipment(Dampers etc.)

Parallel or serial communication to plant control systemProfi bus or mode bus are preferred.Communication to field components either parallel or serial. Operator panel can be located either in weather enclosureor in electrical room.

Modern proven control system

MeasurementsReturn

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Measurement Result

1) Filter p between inlet & outlet manifold Optimized air consumption, filter p and minimumwear of bags

2) Compressed air manifold pressure Check of correct valve operation and compressed air supply

Detection Result 1) Dust content in clean gas and next row Able to detect and locate bag failure

to be cleaned (optional)

2) Damper position (open/closed) Information regarding which compartments are in operation

Filter control system

Plant control system

1) Hopper level indicator Warning/Alarm in case of high level2) Hopper temperature (optional) Avoid condensation in hopper by control

of heating

Measurement/Detection Result

Outlet

pCompressed airmanifold pressure Expansion of the control system

to include more options is possibleInlet

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Control system


Supports

To enable unrestrained heat expansionof the FF, a number of possibilities areavailable, depending on customer requirements or local plant conditions

Pendular support

Roller bearing

Direction of motionFixed point

Guide ring

Spherical topFoundation bolt

(To be cut away after erection)

Concrete

Concrete or steel

Direction of motion

Guide ring

Spherical top

Spherical bearingwith Teflon coveredsteel plate

FF

FF

Slide bearingFF

Spherical top

ExamplesReturn

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Combined pendular and rigid support

Rigid support

Pendular support

Roller or slide bearingFF FF

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Supports


Typical dust removal options

Hopper Hopper Hopper Hopper Hopper

HopperHopperHopperHopperHopper

Screw conveyor

Drag chain

Air lock

Slide gate

Chamber Chamber Chamber Chamber Chamber Chamber

Chamber Chamber Chamber Chamber Chamber Chamber

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Dust removal equipment

FF hopperDrive station

Traction wheel

Turning station)

Turning roller)

FF hopper

Air lock

Slide gate

Drive station

Drag chain

Screw conveyor

Air lock

(Lubricated intermediate bearing)

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removal optionsInstallation examples

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Air lock

Motion detector

Slide gate

Drag chain, drive station

Screw conveyor

Drag chain, turning station

Air lock

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removal options

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Dust removal equipment


Construction Alternative methods

A fabric filter can be mounted in variousways:

Mounting on site of minor units; some pre-mounting takes place on ground level (please see the previous slides)

Mounting on site of major units; the units have been pre-mounted in the manufacturing workshop

Mounting on site of the complete fabric filter on ground level, and later lifting into position by crane

Mounting of very big units in manufacturing workshop or other suitable place, transport to site by truck, and lifting into place by crane

The solution that proves to be optimalfor the customer under the circumstances, financially as well as practically, will beselected economically.

Samples of pre-construction methodsReturn

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Access facilities

Dimensioned for loads:Walks. Evenly distributed 3 kN/m2Walks. Single load 3 kN within 100x100mmRailings. Horizontal 0.4 kN/mStairway angle. 370- 450Standard DINMaterials. Mild steel

800

100

1100

500

550

Grate 30x30x3

Tube 48.3 x3.2Tube 26.9 x 2.6

o 20

260

23020

0

500700

Max

900

0M

in 2

200

Max

300

02400

PlatformStaircase tower 3600 80

0

6000

ESP side wall

ESP roof

500

500

800

1100

~410

200230

Example Returnto layout


Stair tower

Dimensioned for loads:Walks. Evenly distributed 3 kN/m2Walks. Single load 3 kN within 100x100mmRailings. Horizontal 0.4 kN/mStandard DIN

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Access facilities


Insulation

An important factor for the function and life of the fabric filter is an efficient heat-insulation. To avoid condensation with consequent corrosion and reduced lifetime as well as to avoid uncontrolled heat expansion and deformation, the total surface of the precipitator is insulated carefully with mineral wool from 100 to 200 mm thick. The insulation is to be covered, taking into account the heat expansion of the FF, with appropriate sheeting.

Casing isolationHopper isolation

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Where Experience and Innovation Meet

Air Pollution Control Systems

Thank you for showing interest

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