When buying a bag filter, many customers want to be able to buy a bag filter with high dust removal efficiency, simple maintenance, and low price, and the dust bag is the heart of the bag filter. It’s good or bad. The dust removal efficiency of the bag filter plays a crucial role in the operation of the bag filter. Therefore, when purchasing a bag filter, the choice of dust bag is very important. What kind of material should be selected? Below is a brief description of how to use it:
Dust bag conditions can be divided into normal temperature and high temperature
Normal temperature dust bag:
The material of room temperature bag is generally synthetic fiber, natural fiber or glass fiber woven cloth or felt, followed by calendering, singeing, stereotyped into a bag, usually in the flue gas temperature below 120 °C, requiring filter material with acid resistance In the case of durability and durability, polyester fleece and polyester needle punch felt are often used.
1, polyester needle felt cloth bag
Polyester needle felt felt bags have the advantages of high voidage, good air permeability, high dust collection efficiency, long service life, etc., due to their moderate temperature rating, instant up to 120°C, and moderate acid and alkali resistance. Very good wear resistance, so it is a variety of large-scale use of felt filter media.
2, anti-static polyester needle felt
Acid and alkali resistant. Wear resistance, corrosion resistance, good recovery, poor electrical conductivity. Heat resistance: 130° C., elongation at break (%): 20-50, breaking strength (g/d): 438. Melting point (°C): 238-240, melting point (°C): 255-260. Specific gravity: 1.38. Polyester anti-static needle felt surface is smooth, good wear resistance, high strength, higher strength after the fight, better wear resistance, so the fabric has good air permeability, rapid water leakage, easy to clean.
3, coated polyester needle felt
Film coated polyester needle felt features: high air permeability, low resistance, good filtration efficiency, large dust holding capacity, and high dust stripping rate are the best filter materials for bacteria removal and dust removal. Polyester felt and PET film can be made into a variety of filter bags, filter cartridges and filters, widely used in cement, metallurgy, food, coating, petrochemical and plastic industries such as smoke and dust particles of governance and recovery.
4, water and oil proof polyester needle felt
Polyester needle felt water-repellent and oil-removing dust bag can effectively prevent penetration of water and all kinds of oil dirt. Compared with common filter materials, it not only has water-repelling and oil-repellent properties, but also has anti-knot and easy-to-peel property for dust. The dust that enters the baghouse contains more water and oily and hygroscopic and deliquescent dusts, which may generate a water film on the dust surface, increasing the adhesion.
High temperature dust bag:
High-temperature type is usually used in the treatment of high-temperature flue gas (<250 °C), the main selection of graphitized glass wire cloth; under certain special circumstances, the use of carbon fiber filter, etc. In general, the pulse injection bag filter is selected needle felt , Chamber-reverse blow bag filter or mechanical vibration bag filter choose woven cloth.
1、Mitas needle felt cloth bag
Mai Tas Needle felt dust bag has the characteristics of high temperature resistance, high strength, acid and alkali corrosion resistance, wear resistance, flex resistance, etc. After different surface chemical treatment and finishing technology, it also has easy cleaning, water repellent and oil repellent, and anti-dust. Static electricity and other functions, and there are suitable for 200 °C -300 °C series products.
2, Flumez bag
Flumez bag series products are characterized by high temperature resistance, high strength, resistance to acid and alkali corrosion, abrasion resistance, and folding resistance. Flumez bag has undergone different surface chemical treatment and finishing techniques, and Flumetz bag also has easy cleaning. , Water repellent, anti-oil, anti-static and other characteristics; and a series of products suitable for different temperature sections. The speed at which flue gas passes through the filter (called the filtration rate) is important in the operation of Flumez bag. Generally, the filtration rate is 0.5-2 m/min, and the particle efficiency greater than 0.1 μm can reach 99% or more, and the device resistance loss is about 980-I470Pa. Compared with glass fiber filter, Flumez bag filter has significantly improved abrasion resistance, flex resistance and peel strength, and can bear high filtration load. The Flumez bag filtration speed can reach 1.0m/min, and the running resistance is low. Compared with synthetic fiber resistant high temperature filter, Flumets bag overcomes the weaknesses of chemical fiber filter, such as large elongation, large deformation, low temperature resistance, and poor corrosion resistance; moreover, the size and strength of Flumets bag are better. And the price is lower than other high-temperature chemical fiber. Flumetabs bags are widely used in steel, smelting, chemical, carbon black, building materials, electricity and other departments.
3, glass fiber needle felt bag
Glass fiber needle felt dust bag is a kind of high temperature resistant filter material with reasonable structure and good performance. It not only has the advantages of high temperature resistance, corrosion resistance, dimensional stability, minimal elongation and shrinkage, and high strength of glass fiber fabrics, but also the felt fiber with a single fiber, three-dimensional microporous structure, high porosity, and low resistance to gas filtration. It is a high-speed and high-efficiency high-temperature filter material. Compared with other high temperature resistant fiber mats, it has special advantages such as low price, low running resistance, high filtration accuracy and higher temperature resistance. Suitable for high temperature smoke filtration in steel, metallurgy, carbon black, power generation, cement, chemical and other industries.
4, PPS acid resistant needle felt bag
The working temperature is 190°C, the short-term working temperature is 232°C, the melting point is 285°C, and the limiting oxygen index is 34-35. Oxygen content of 15% or less can be applied. Sulfur contained in the fuel or sulfur oxides in the flue gas has been proven to be resistant to acid and alkali corrosion and strong chemical resistance. Flue occasions where moisture is present. At the temperature of 190°C~232°C, the PPS filter bag has an excellent performance record when the air-to-cloth ratio is as high as 5:1 and the line cleaning ratio is 6:1 for off-line cleaning. PPS fiber has the strength of complete retention and inherent chemical resistance, can maintain good filtration performance in harsh environments, and achieve an ideal service life. Among the pulsed dust-removing dust collectors such as filtering coal-fired boilers, waste incinerators, and power plant fly ash dust collection, PPS filter felts are ideal filter materials.
In summary, each type of filter material has its own advantages. Only the dust bag suitable for the customer’s own working condition is good. We recommend that customers purchase according to their own working conditions and economic conditions. The dust bag is a key component that determines the dust removal efficiency and working temperature of the bag filter. The filter material should be selected according to the temperature, humidity and chemical characteristics of the gas. The size, weight, shape, and whether or not the grinding material and the dust concentration of the material should be selected. The factors such as filtration speed, cleaning method, emission concentration, and bag filter operating system are taken into consideration.
