Difference of Dust Removal Mechanism of Different Filter Materials in Bag Filter

The difference of dust removal mechanism of different filter materials

1. The pores of the filter material exist between the warp and weft yarns (generally, the wire diameter is 300-700 μm, the gap is 100-200 μm), and among the fibers, and the latter accounts for 30% -50% of the total pores. When dust filtering starts, most of the airflow passes through the small holes between the warp and weft yarns, and only a small part of the dust passes through the fiber gap. The coarse dust is embedded in the small holes between the fibers, and the airflow continues through the gap between the fibers. The filter material becomes an effective filter material for coarse and fine dust particles, and forms a process of collecting dust. In addition, when the diameter of the dust in the airflow is smaller than that of the fiber, the effects of collision and diffusion increase, and the dust removal efficiency is improved.

2. The needle felt or needle felt filter material, because it constitutes a thick porous filter bed, can fully exert the above effects, but the filtering function of the "second filtering layer" is still very important.

3. Membrane filter material, microporous film laminated filter material (membrane filter material for short) is made of polytetrafluoroporous ethylene as a raw material, which is expanded into a microporous film, and this film is used in a special process Laminated on various fabrics or paper substrates, making it a new type of filter material.

PTFE membrane filter material is composed of PTFE microporous membrane and various substrates (PPS, glass fiber, P84, aramid) with special composite technology. The surface of the polytetrafluoroethylene (PTFE) film is smooth and resistant to chemicals. It is coated on the surface of the ordinary filter material to play the role of a disposable dust layer. It has unparalleled advantages of traditional filter materials. The membrane filter material has the characteristics of high peel strength, large air permeability, and small resistance, uniform pore size distribution, etc. As a dust bag or pleated dust filter cartridge, installed in the dust removal equipment, it will quickly and effectively intercept the calculation in microns. The ultra-fine dust has a dust removal efficiency of more than 99.99%. It is the most effective and economical new filter material for industrial dust filtration and material recovery.

The membrane-coated filter material has a synthetic layer on the surface, with a grid-like structure inside, a special film with a thickness of 50 μm and containing 1.4 billion micropores per cm³. Obviously, its filtering effect is mainly the sieve effect, so it is called surface filter.

Reasonable cleaning cycle

In the actual operation of the bag filter, as the dust layer of the filter bag increases, the filter material needs to be periodically cleaned. As the amount of collected dust continues to increase, the dust layer continues to thicken, and its filtration efficiency increases, the resistance of the dust collector also gradually increases, and the amount of air passing through the filter bag gradually decreases. Dedusting treatment, that is, timely and uniform removal of dust accumulation on the cloud filter bag, and avoid excessive dust removal, so that it retains the "primary dust layer" to ensure stable and high efficiency of work, which is larger The filter material for cleaning dust is more important.

The above is the introduction of the differences in the dust removal mechanism of different filter materials of the bag filter. If you want to know more equipment information, please consult the customer service staff of Henan Zhengzhou Mining Machinery Co., Ltd is a professional mining machinery equipment manufacturer with rich technical accumulation and project experience. We sincerely invite you to visit our factory on site!