Flat Bag Filter

Name: Flat Bag Filter
Brand: MDSJ Process | DUCON

Flat Bag Filter provides effective dust collection in space-constrained plants by delivering a large filtration surface in a compact body.

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Flat Bag Filter

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Flat Bag Filter

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Ducon Flat Bag Filter

MDSJ Flat bag type jet pulse bag filters can be applied in compact structures in places with a flow rate of up to 200000m3/h and porous heights and bags can be arranged vertically or horizontally, bag sizes are 30 diameters and 300m lengths are 1 to 2 sizes. We have land production from 50000 m3/h to 3000000m3/h, its most important feature is that it can be produced 30 percent more compactly than other filters in narrow and low height areas.

Body structures are produced in carbon steel, corten stainless steel, externally reinforced, resistant to 80 mb vacuum according to operating characteristics.

Design criteria
MDSJ also analyzes the following in filter design
Gas flow rate
Gas temperature
Inlet dust load
Outlet dust load
Abrasiveness, stickiness, micron size density of dust
Dust absorption sources
Longest distance
Whether the installation location is open or closed
Geographical condition
Structural feature

Ducon flat bag jet pulse filters can be assembled in a field suitable for panel manufacturing land and sea transportation in a standard 120m2 working feature up to 280 degrees.

Applications

Small and medium-sized foundry factories, cement factories, chemical, pharmaceutical, food, glass industry, stone wool production facilities, construction chemicals, rubber factories, cement, mining, lime plaster facilities, small-scale foundries, textile, feed, wood MDF, chipboard facilities, solid waste incineration, coal power plants, aroma facilities, fish meal meat meal factories and others

MDSJ flat pulse jet filter delivery options
Integrated explosion vents when required
Differential pressure control,
Temperature control optional
Bunker level control optional
Bunker blockage breaker optional
Dew prevention bunker heater optional
Up to 5mg/m3 emission value optional 20mgr/m3 standard warranty
Insulation optional
MCC control system
Optional choice of fan or no fan, suction channels and chimney option
ATEX certified accessory (optional)

What a Flat-Bag (Envelope) Filter Is and How It Works

The filter element is flat/envelope-shaped instead of a round bag; it is tensioned over a rigid wire cage or panel frame.
Dusty gas passes across the outer surface of the envelope; dust builds as a cake on the outside while clean gas is drawn out from inside to the clean plenum.
The flat geometry packs more cloth area into the same housing volume than round bags (compact design).
When the dust cake reaches a set differential pressure, cleaning triggers: a pulse-jet burst or mechanical shaking cracks the cake and drops it into the hopper.
In the pulse-jet variant the cell stays online while a brief high-pressure air burst is applied (plenum-pulse); in the shaker variant the cell is isolated and the elements are mechanically shaken to shed the cake.

Technical Specifications and Typical Operating Range

Filtration: typically 99%+ efficiency on dry particulate (high fine-particle capture including PM10/PM2.5 depending on media and design).
Air-to-cloth (A/C) ratio: typically 0.8-1.5 m/min with woven media on shaker/gentle cleaning; typically 1.5-3.0 m/min for pulse-jet felted-media envelope designs.
Operating temperature: typically -30°C to +260°C depending on the selected fabric media (high temperature requires special media).
Area density: the envelope geometry yields markedly more filter area per footprint, so the same flow fits into a more compact housing.
Differential pressure (ΔP): typically 100-150 mmH2O (about 1.0-1.5 kPa) operating point; media blinding raises ΔP.
Housing/frame: carbon-steel or stainless (304L/316L) housing; suitable internal protection for corrosive/humid streams.

Where It Is Preferred — Applications and Retrofit

Retrofit projects with space constraints in existing plants — when high filter area must fit into a tight footprint.
Compact dust-collection units and mid-flow lines needing a middle ground between cartridge and round-bag filters.
General industrial dust: wood/sawdust, food and feed, plastic granulate, metalworking, and general ventilation extraction lines.
Applications with relatively low-to-moderate dust load where gentle cleaning and long bag life matter.
Note: with highly sticky/hygroscopic dust or very high dust load, envelope elements are more prone to bridging/blinding; media and A/C must be selected carefully on those lines.

Selection and Operating Criteria

Air-to-cloth ratio, dust characteristics (stickiness, moisture, particle size), and temperature must be evaluated together.
Cleaning method choice: mechanical shaker for gentle handling, long life, and low A/C; pulse-jet for higher load and compact A/C.
Frame/cage quality, envelope tensioning, and spacing between elements directly govern bridging risk and ease of maintenance.
Fabric media is selected to the process temperature and chemistry; high temperature or acidic gas requires suitable technical media.
Maintenance access and element-change layout should be defined early in tight-space retrofits.
Where explosive dust is possible (organic, metal dust), ATEX zone classification and grounding/anti-static measures must be assessed.

Frequently Asked Questions

What is a flat-bag (envelope) filter?

A flat-bag filter is a compact baghouse variant that uses flat/envelope-shaped filter elements instead of round bags. The envelope geometry packs more filter area into the same housing volume, which is why it is preferred for tight spaces and retrofits.

What is the advantage of flat bags over round bags?

Markedly more filter area per footprint, so the same flow fits into a more compact housing. That is the main advantage in retrofit projects with space constraints in existing plants and in mid-flow lines.

How is a flat-bag filter cleaned?

Two common methods: pulse-jet (a brief high-pressure air burst while the cell stays online) or mechanical shaker (the cell is isolated and the elements are shaken to shed the dust cake). The shaker is gentler and extends bag life; pulse-jet handles higher dust load. (Note: reverse-air is specific to large-diameter round bags that collect dust on the inside and is not suited to outside-collecting envelope elements.)

What efficiency does a flat-bag filter reach?

With correct media and design, typically 99%+ efficiency on dry particulate, with high capture of fine particles including PM10/PM2.5.

What air-to-cloth (A/C) ratio should be used?

Typically 0.8-1.5 m/min with woven media for shaker/gentle cleaning, and typically 1.5-3.0 m/min for pulse-jet felted-media envelope designs. Dust characteristics and temperature determine the value.

Up to what temperature does a flat-bag filter operate?

It depends on the selected fabric media; typically -30°C to +260°C. Higher temperatures require suitable high-temperature technical media.

Is a flat-bag filter suitable for every dust?

It suits general industrial dry dust very well; however, with highly sticky, hygroscopic, or very high dust loads, envelope elements are more prone to bridging/blinding. Media and cleaning method must be selected carefully on those lines.

Who is the flat-bag filter manufacturer in Turkey?

MDSJ Process designs, manufactures, installs, and commissions flat-bag (envelope) and other dry dust filter systems in Turkey under the DUCON brand. It has delivered turnkey industrial air-pollution-control projects since 1986.

Quick Info

Envelope (flat) bag elements deliver high filter area per unit volume — a compact baghouse

Ideal for tight spaces and retrofit; denser packing than round bags

Dry dust filtration with pulse-jet or mechanical-shaker cleaning

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