Dust filter bag is known as the core of the bag filter, is a highly efficient dust filter media, generally take polyester fiber, acrylic fiber, pps fiber, PTFE fiber, aramid fiber, P84 fiber and other raw materials, has good permeability, high dust collection rate, easy to clean ash, service life of up to 2-4 years.
The previous article we introduced you to the classification of dust filter bags, raw material selection and production process, this article will explain the main product characteristics of the filter bag indicators and performance parameters in detail the basics of the needle felt.
The main product characteristics of dust filter bags are generally divided into physical characteristics and functional characteristics, physical characteristics include: grammage g/m2, thickness mm, air permeability (m3/m2-min), warp/weft fracture strength Tensile strength (N), warp/weft fracture elongation Tensile elongation (%), thermal contraction rate; functional characteristics are Functional characteristics include: heat resistance, acid and alkali resistance, oxidation resistance, filtration efficiency (VDI test), ash removal performance (VDI test, filtration resistance, ash cleaning cycle, etc.).
Dust filter bag performance parameters can be divided into heat resistance, filtration characteristics, corrosion resistance, hydrophobic and oleophobic properties, anti-static properties and flame retardant properties.
1、Heat-resistant characteristics
1) The strength characteristics of the filter media after 24 hours at high temperature (specified temperature).
Meridional breaking strength and meridional elongation
Weft breaking strength and weft elongation.
2)Dimensional change rate (thermal shrinkage) of the filter media at room temperature and after 24 hours at high temperature (specified temperature)
2、Filtration characteristics
A process: 30 times of constant pressure filtration and ash cleaning; filtration efficiency, ash cleaning cycle, dust stripping rate and resistance change
B process: forced 5 seconds interval 10,000 times cleaning ash; resistance change
C process: 10 times of constant pressure filter cleaning
D process: 30 times of constant-pressure filter cleaning; filtration efficiency, cleaning cycle, dust stripping rate and resistance change
3、Corrosion resistance
Acid resistance: 60% sulfuric acid temperature 85℃
Alkali resistance: 40% NaOH
4, hydrophobic and oleophobic performance
5、Antistatic performance: used for combustible dust capture, including friction potential, half-life, surface charge density, surface resistance, body resistance and other indicators.
6、Flame retardant performance
The basic requirements of industrial sites on the needle felt
1, temperature resistance: long-term withstand high temperature will not make its strength drop and cause damage to the bag.
2, corrosion resistance: oxidation resistance, acid resistance, hydrolysis resistance, high temperature does not absorb moisture, anti-flue gas water vapor and acid - chemical stability is the basis for the strength of the filter media to be guaranteed.
3, folding resistance: long-term expansion and contraction of the movement, there must be sufficient mechanical strength as a guarantee, and good dimensional stability to ensure that the filter bag to maintain long-term use without deformation.
4, wear resistance: adapt to the soot composition contains SiO2, Al2O3, Fe2O3 and other substances.
5, low resistance and high efficiency: good air permeability, while the filtration precision must meet the requirements of emission standards, and slow increase in operating resistance, which is the basic to ensure the service life of the needle felt.
Anhui Yuanchen Environmental Protection S&T Co., Ltd. (hereinafter referred to as "Yuanchen Technology") has been specialized in environmental protection industry for 16 years, and dust filter bag is one of our two main products. After the process of needle-punching, burnishing and calendering, emulsion impregnation, high temperature shaping and laminating, we make various kinds of high precision, high temperature, abrasion and corrosion resistant filter media products required by actual working conditions. It is mainly used in thermal power generation, building materials, iron and steel, waste incineration, chemical industry, glass and other industries, which can comprehensively improve China's air pollution prevention and control ability, realize ultra-clean emission, and meet the national strategic needs in the field of environmental protection.
