Air Pollution Control Equipments

Bag Filter

WHAT IS BAG FILTER?
Recovery of particulate matter from exhaust gas is vital for any industry from two aspects

• To avoid pollution problems
• Recovery of finished product-increasing the plant yield

For recovering particulate matter different options available are - Cyclones, Venturi, scrubbers, bag filters, electrostatic precipitators etc. Out of these bag filter becomes the best choice if following are dominant selection criteria's:

• Material is expensive and hence high collection efficiency is desired.
• Particulate size is very fine.

Material recovery in powder form is desirable & not in solution form

Cyclone
This is a device to separate solids (in powder or granular form) from air/gases. When the material is moving as in pneumatic conveying, the solids are separated. In this device, air is made to flow at cyclonic speed and made to rotate in a cylindrical vessel of suitable design. When the solid material attains high speed, it picks up centrifugal force and choose to cling to outer surface while air retains high speed it gets due to its velocity factor. Suddenly in the center, air outlet is provided for air to go out while due to centrifugal force the solid material is not able to change direction but goes downwards and gets separated.

This device is capable of offering separation efficiency up to 90%, of course, depending upon, design, material, bulk density etc. There is one collecting hopper where material gets collected. Smaller the diameter, better is the efficiency.

Multi Cyclone
When volume of air flow is large, single cyclone tends to become inefficient. Therefore it is recommended to use multiple number of cyclones thus called multi cyclone. It has a common body container wherein number of small cyclones are included, each handling small volumes, thus offering better efficiency. Thus, number of cyclones operating together offer far better performance for larger volume than single one. Of course dimensions are favorable too and so the cost.

Yansons Also supplies the spares required for the Bag filter. Yansons has in-house facility of manufacturing these spares.

Bag Cages
Bag cages are required in the bag filter. The cage is inserted in the bag which avoids the bags to collapse due to negative pressure in the bag filter.

Yansons manufactures cages for almost all type of dust collector in 6 to 24 vertical wires. We fabricate cages from various materials like-

• Carbon steel with plating
• Galvanized cages
• Epoxy coated cages
• SS 304, SS 316, SS 316L

Also we do the Passivation for the MS plated cages for different applications:

• Green Passivation
• Blue Passivation
• Yellow Passivation

Ventury
Venturies add to the cleaning efficiency of the pulse jet dust collectors. Yansons offers wide variety of styles & sizes for top & bottom removal of the cages.

We can supply the Venturies manufactured from:

• Carbon steel- Cast / Spun
• Aluminum- Cast / Spun
• Stainless Steel