Dust collector filter bags are the core filtration components of bag filters. The material of the dust collector filter bags directly determines the performance parameters of the bag filters, such as the specifications of the dust removal equipment, dust removal efficiency, emission concentration, operating resistance, service life, and other indicators. Therefore, choosing the correct and appropriate dust collector filter bag is very important.
Tips 1: The Selection Principle For Dust Collector Filter Bags
Normally, the cylindrical pulse-type filter bag is hung vertically from the air inlet of the bag filter. When the dusty gas enters the filter bag from the air inlet and passes through the deflector, most dust particles are separated by inertia and go directly into the dust hopper of the bag filter. The material of the filter bag directly affects the filtration effect. The dust extractor filter bag is generally selected according to the filter bags’ dust gas and dust cleaning method. There are some principles for reference when selecting:
1. Reasonable structure and high capture rate;
2. Excellent peelability, easy to clean dust but not easy to scale;
3. Suitable air permeability, low resistance, and high filtration precision;
4. Sufficient strength, good dimensional stability;
5. Good temperature resistance, chemical corrosion resistance, oxidation resistance, hydrolysis resistance, and wide adaptability;
6. Wide source of raw materials, stable and reliable performance;
7. Competitive price and long lifespan.
Tips 2: Choose Dust Collector Filter Bags By Observing Collected Gas
The dusty gases produced by different industries have different properties. Consumers can choose the suitable dust collector filter bag material based on the dust observation as below:
1. Gas Temperature
The temperature of the dust-containing gas is an important factor in the selection of filter bags. Usually, the dust gas lower than 130 ℃ is called room-temperature gas, while over 130 ℃ is called high-temperature gas. Such as waste incineration and other industries producing high-temperature dust bodies, choosing high-temperature-resistant materials is necessary.
2. Gas Humidity
Moisture gas makes the dust collected on the surface of the filter bag wet and bond, especially for water-absorbing, deliquescent and wet dust, which will cause the bag to stick. Therefore, choosing a filter bag with a smooth surface, long fibers, and easy to clean dust is significant. The filter bag treated with film has excellent moisture resistance and dust removal function and is the first choice for high humidity gas.
3. Gas Chemical Properties
In all kinds of furnace flue gas and chemical waste gas, there are many chemical components such as acids, alkalis, oxidants, organic solvents, etc. To make the filter bag long-lasting, purchasers need to choose the bag material with excellent chemical properties.
Tips 3: Choose Suitable Dust Collector Filter Bags from Various Materials
Dust collector filter bags have good breathability and high dust removal efficiency. Gas particles in different industries have various characteristics, and it is important to choose the right material to achieve the best dust removal effect. The following are some commonly used dust filter bag materials.
1. PTFE Bag
Polytetrafluoroethylene (PTFE), also known as Teflon, is a strong microporous material with a pore size of 0.1μm to 2.0μm and a thickness of about 1mm. It is resistant to cold and heat and can be used for a long time at -200℃ to 250℃, and It also has good electrical insulation. PTFE filter bags are often treated with a membrane or impregnate technology to improve dust removal efficiency and extend service life.
PTFE bags of bag filters are mainly used in various waste incineration, chemical, pharmaceutical, and other industries with harsh working conditions for flue gas cleaning and material recovery.
2. Membrane-laminated Fiber Glass Filter Bag
Glass fiber has excellent resistance to high temperatures, acids and alkalis, and water. In the past, glass fiber filter media was prone to wear and tear during installation and operation and could not be cleaned at high pressure. However, with the development of technology, glass fiber is treated with a PTFE membrane or PTFE impregnated, which enhances its abrasion resistance and improves its filtration performance. Membrane-laminated fiberglass filter bags have been widely used all over the world.
The bag filter made of glass fiber is mainly used for dust treatment of chemical powders in steel smelting, cement industry, biomass boiler, etc.
3. P84 Bag (Polyimide Bag)
The P84 dust collector filter bags are slightly less resistant to high temperatures than glass fiber and have good acid and alkaline resistance. The P84 bags from Farrleey have various chemical finish methods, including water and repellent treatment, PTFE membrane, and PTFE impregnate. These treatments improve the special fiber structure of polyimide bags and greatly enhance their filtration effect.
These filter bags are mainly used in cement, iron, and smelting industries.
4. Polyester Bag
The polyester filter bag is usually used in low-temperature applications and does not need to be coated. Only when the emission requirement is less than 30 mg/Nm³, or when the dust is very fine, and the humidity is high, will it be coated. Usually, the polyester bag’s chemical properties are not as good as the materials mentioned above. However, to improve its filtration performance and enlarge its applications, experienced manufacturers like Farrleey offer various laminating methods, such as water and oil repellent treatment, anti-static coating, and PTFE membrane impregnate.
The polyester bags have wide applications of furniture, ceramics, powder coating, chemicals, building materials, food processing industries, etc.
Except for the four types of dust collector filter bags mentioned, Farrleey, an experienced and innovative filter bag manufacturer, offers other commonly used filter bags such as PPS, aramid, and homopolymer acrylic and polyester anti-static filter bags.
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Established in 2007, Farrleey focuses on developing, manufacturing, and selling filter cartridges and filter bags for various types of dust removal equipment. With the responsibility of purifying the global environment, Farrleey sells filtration products and comprehensive solutions to filtration technology problems. For more information on creating a clean environment, visit Farrleey website today!