Dust separators with filter bags

Dust separators with bags use mechanical means to ensure separation. Settling takes place due to gravity. A bag is placed in the dust chamber. In contrast to dust separation cyclones where particles are separated from the tangential influx of air by centrifugal forces, here the dusty air flows through at a speed of 0.4-0.8 m/s. Guide blades and louvers are installed to increase efficiency.

The dust-laden gases enter the contaminated gas section of the filter through ducts. Here they collide with an impact plate to separate out the larger particles. Now containing only fine dust, the gas enters the dust chamber and is evenly distributed along the tubes. The dust is on the outside of the tubes attached to the supporting frames. Due to the suction mode, the tube is pulled onto the frame and the dust is deposited on its outer surface. Thus cleaned, the gas heads through the tubes into the clean gas chamber and then through the ducts to the fan. The tubes are cleaned automatically by short bursts of clean air. An electronic control mechanism uses electromagnetic valves to operate the membrane valves for impulses lasting 0.1-1.5 seconds in accordance with the required settings. During each impulse, air at a pressure of 5-7 bars flows through a distributor tube to the attached injector and then into the tube. The bag, which has thus far been pressed against the frame in a star shape, is suddenly filled with air and under inertia the dust particles fall into the collection unit. This is one of the most widespread methods of cleaning the tubes, but it is not the only way. The following are some other solutions:

Dust separator with filter bags Lateral swinging movements
 Longitudinal shaking
 Transverse shaking
 Counterflow bursts of air
 Counterflow blowing with air
 Pre-programmed longitudinal shaking
 Reverse-jet procedure

Filter flow resistivity

The two main components of pressure drop in filtration equipment are the clean filter material and the resistance of the deposited dust layer. The flow resistivity of lower density filters is less than that of higher density filters; since the flow rate generally remains in the laminar range, the resistance depends on the amount of gas and its value is directly proportional to filtration speed.

Factors determining the joint resistance of the separated dust layer and the filter:

 Surface load of filter layer
 Free volume of filter material
 Properties of the carrier gas (density, viscosity, moisture content, etc.)
 The concentration of dust in the gas, or the extent of dust load
 The properties of the dust (particle size, size distribution, morphology, physicochemical properties)

The pressure drop resulting from the resistance is determinative in terms of economical operation.

The movement of particles in a gravitational field

Two opposing forces affect the particles: gravity and drag force. The flow resistivity around the particles consists of dynamic resistance stemming from changes in the speed of the medium and friction resistance due to viscosity. The sink rate depends on the flow properties of the medium (Reynolds number), which is calculated differently in the laminar (Re<0.1), transitional (0.1<Re<1,000), and turbulent (1,000<Re) ranges.

 laminar (Re<0.1): friction is definitive, with dynamic resistance negligible
 turbulent (1,000<Re): dynamic resistance is definitive, with friction negligible
 transitional (0.1<Re<1,000): both effects must be taken into consideration

The motions of particles smaller than 0.1 μm are chaotic (Brownian) and these remain suspended in the air.

Dry mechanical


 Suitable for separating dry dusts during continuous operation
 May be used over a wide range of temperatures
 Not sensitive to varying dust concentrations in the airflow


 Not suitable for separating particles smaller than 5 μm
 Unable to remove gaseous contaminants
 Separation efficiency strongly influenced by gas flow-rate

Ask for a quotation, for more information!

Which product or service are you interested in?

Your contact information:


Can we help you?

Have a question?

We call you back!

Enter your phone number and colleagues CALL YOU BACK SOON!

Services we provide

Besides marketing filtration technology products, industrial filters, filter cartridges, accessories and filtration equipment, Indufil PLC. also offers various support services, engineering and financial consultancy, technical planning, and comprehensive filtration technology design.

Filter management »

Indufil PLC. stocks the quantities of filters and accessories required for synchronisation with our partners' production needs. We can deliver in accordance with predetermined schedules or just-in-time. Besides filter logistics, we also provide maintenance, certification and measurement services.

Design and installation »

New filtration technology problem? Our engineers will help you pick the filtration technology that best meets your needs. We also do installations to a short deadline.

Waste management »

Our team of experts has many years of experience in the replacment, collection, transportation, cleaning and disposal of used filter cartridges.


Download brochures, catalogues and information on our filtration technology products, filters, filtration options and related services.

Indufil brochure

A general brochure in English containing the main groups of filtration technology products as well as company data.

Download »

Contact Us

Filtration technology

Professional industrial filtration technology options, industrial filters, filter cartridges, accessories, filter equipment, engineering services, and expert consultancy.

More »