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

The difference of dust removal mechanismof 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 amongthe fibers, and the latter accounts for 30% -50% of the total pores. When dustfiltering starts, most of the airflow passes through the small holes betweenthe warp and weft yarns, and only a small part of the dust passes through thefiber gap. The coarse dust is embedded in the small holes between the fibers,and the airflow continues through the gap between the fibers. The filtermaterial becomes an effective filter material for coarse and fine dust particles,and forms a process of collecting dust. In addition, when the diameter of thedust in the airflow is smaller than that of the fiber, the effects of collisionand diffusion increase, and the dust removal efficiency is improved.

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

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

PTFEmembrane filter material is composed of PTFE microporous membrane and varioussubstrates (PPS, glass fiber, P84, aramid) with special composite technology.The surface of the polytetrafluoroethylene (PTFE) film is smooth and resistantto chemicals. It is coated on the surface of the ordinary filter material toplay the role of a disposable dust layer. It has unparalleled advantages oftraditional filter materials. The membrane filter material has thecharacteristics of high peel strength, large air permeability, and smallresistance, uniform pore size distribution, etc. As a dust bag or pleated dustfilter cartridge, installed in the dust removal equipment, it will quickly andeffectively intercept the calculation in microns. The ultra-fine dust has adust removal efficiency of more than 99.99%. It is the most effective andeconomical new filter material for industrial dust filtration and materialrecovery.

Themembrane-coated filter material has a synthetic layer on the surface, with agrid-like structure inside, a special film with a thickness of 50 μm andcontaining 1.4 billion micropores per cm³. Obviously, its filtering effect ismainly the sieve effect, so it is called surface filter.

Reasonable cleaning cycle

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

Theabove is the introduction of the differences in the dust removal mechanism ofdifferent filter materials of the bag filter. If you want to know moreequipment information, please consult the customer service staff of HenanZhengzhou Mining Machinery Co., Ltd is a professional mining machineryequipment manufacturer with rich technical accumulation and project experience.We sincerely invite you to visit our factory on site!