We are pleased to offer delivery of the following industrial fabric filters Model FVU designed to effectively remove particulate emissions from gases:







Regeneration of filter fabric by reverse atmospheric air flow



Regeneration of filter fabric by reverse atmospheric air flow using dedicated air fan located in the roof of the filter



Puls-jet filter fabric regeneration



Special filter design for safe control of explosive or combustible particulates. Regeneration of filter fabric by reverse atmospheric air flow








Regeneration of filter fabric by reverse atmospheric air flow



Puls-jet filter fabric regeneration



Special filter design for safe control of explosive or combustible particulates. Regeneration of filter fabric by reverse atmospheric air flow








Regeneration of filter fabric by reverse atmospheric air flow



Puls-jet filter fabric regeneration



Special filter design for safe control of explosive or combustible particulates. Regeneration of filter fabric by reverse atmospheric air flow












Principle:

The pulse-jet regeneration system uses an air ejector located downstream of filtration elements, as shown in the sketch above. When a short pulse of compressed air jet is directed into this ejector it mixes with large amount of clean air downstream of filtration elements, and resulting mixture is pushed in reverse through filtration fabric. This rapid air flow results in fabric flexing, causing release of the dust cake from the fabric surface. The broken dust cake falls into the dust hopper.


Advantages:


Very intensive regeneration action caused by dynamic forces in the dust cake, as well as high reverse air flow velocity, which is as much as 2 to 5 times higher as compared to plain reversed ambient air flow regeneration described below

This principle is adaptable to both positive, as well as negative pressure dust control systems

Disadvantages:


Cost of providing compressed air at a pressure of 0.5 to 0.7 Mpa

Danger of freeze up of compressed air pipes in areas of subfreezing temperatures

Shorter life of filtration fabric caused by high fabric stress during intensive dynamic pulse

Slightly lower dust control efficiency caused by dust particles penetrating filtration fabric during the air pulse

Settling of broken dust cake into the hopper is incomplete for very short duration of the air pulse of 0.1 to 0.3 seconds. Often this setback is resolved by cleaning part of the filter, which must be off line.

Initial and operating cost of the pulse-jet filters is higher as compared to reverse atmospheric air flow regeneration

Recommended Application of Pulse-Jet Filters:

Best performance can be achieved when applied to control of very fine and sticky particulates, as for example emissions from glass melting furnaces, laser and flame metal cutting, welding, dip galvanizing, etc. Also wherever the filter operates under positive pressure, like in controlling dust emissions from storage tanks filled with pneumatic transportation system.







Principle:

The reverse atmospheric air flow regeneration uses dynamic force of a reverse air flow through the fabric to dislodge dust cake from the fabric surface. The reverse air flow is accomplished by opening “flushing” damper and closing “outlet” damper on the regenerated section of the filter resulting in reverse flow of outside air through the fabric, as shown in the sketch above. This principle is applicable only when the filter operates under negative pressure.

Advantages:


Less stressful cleaning of the fabric results in longer filter fabric life and higher dust collection efficiency.

Filter reverse flow duration is about 3 seconds, which is sufficient time for settling of broken dust cake into the hopper

Both the initial and operating costs are low

Disadvatages:


Reverse ambient air flow intensity is dependent upon the level of negative pressure inside the filter. This pressure should be at least 1000Pa. This value is easily reached by most of the industrial air handling systems.

Recommended Application of Ambient Reverse Air Flow Filters:

These filters do not have many limitations except when particulates to be collected are extremely fine and/or sticky.

Note: A detailed analyses of various types of fabric filter regeneration as far as economy and field of application has been published in Czech technical magazine “ KLIMATIZACE “ January, 1998.