Views: 0 Author: Site Editor Publish Time: 2021-11-09 Origin: Site
Asphalt mixing plant Metas dust bag is mostly used in various high temperature flue gas filtering occasions. It has excellent performance. It is a kind of high temperature resistant dust collector filter bag variety, especially suitable for the flue gas dust removal of asphalt mixing plant. Generally, under normal flue gas temperature conditions, the bag filter requires the temperature resistance of the dust filter bag to be below 150℃, and in the occasions with higher flue gas temperature, such as smelting plants, iron smelting blast furnace gas, and calcium carbide plant kiln tail gas , Carbon black plant, foundry, steel plant flue gas, cement plant shaft kiln exhaust gas, asphalt concrete mixing asphalt flue gas, coal-fired boilers and other high-temperature dust removal and purification are not competent.
Metas is the collective name of Nomex produced by DuPont of the United States and Conex produced by Teijin of Japan. METAS needle punched filter bag is felt by needle punching of polyamide fiber. It has good high temperature resistance and corrosion resistance. It also has low resistance, stable size, easy to clean dust, and has a strong interception and screening effect on dust. It can form a dust layer for secondary dust collection. It has a certain degree of chemical corrosion resistance. It can be used under pH 3-4 working conditions. The strength retention rate is stable above 90%. The air permeability is good. The dust removal efficiency is above 99.99%. And other advantages, the filtering wind speed can reach 1.0m/min. Metas needle felt is formed by padding, pre-baking and baking treatment with hydrophobic agent and oleophobic agent to form a net-like state that is attached to the surface of the filter material fiber, thereby reducing the surface tension of water and oil and the filter bag , To make the working fluid react with certain groups in the macromolecular structure of the filter material fiber to form a macromolecular chain, change the affinity of the fiber with water and oil, and reduce the surface tension of the filter material to less than that of water and oil. Surface tension, the water and oil proof METAS needle felt filter bag is obtained.
Asphalt mixing plant production process: raw material mixing, drying, screening, and other components, the processed stones and asphalt are loaded into the drum and heated, and then the aggregate, lime powder and hot asphalt are mixed to form asphalt concrete paving Use it on the road. In this process, a large amount of smoke and dust will be produced. The temperature of the dust and flue gas in the dust collector is as high as 120℃-220℃, the humidity of the flue gas is 5-15%, the dust concentration is below 30g/m3, and the diameter of dust particles is mostly 10 Between -15μm. The nature of the flue gas dust produced by the asphalt mixing plant is very complicated. The flue gas has high temperature, high concentration, easy acid condensation, oily substances, and easy to stick to the bag. These factors pose a threat to the operation of the bag filter and the normal operation of the dust bag. , There is a need for a water- and oil-proof filter bag with high temperature and corrosion resistance. Among the varieties of high-temperature filter bags, Metas dust bag is especially suitable for the working conditions of the asphalt mixing plant.
Metas high-temperature dust-removing cloth bags have the following four notable characteristics:
① Excellent high temperature resistance: it can work continuously at a temperature of 204°C (an instantaneous temperature of 250°C), and can withstand repeated instantaneous temperature fluctuations of 250°C.
② Good dimensional stability: only less than 1% heat shrinkage rate at 250℃, high temperature stability.
③ Fire resistance: it starts to decompose and carbonize at 400℃, the limiting oxygen index (LOI) is 30, and it neither spontaneously combusts nor supports combustion.
④ Excellent chemical resistance: low concentration of acid and alkali and most hydrocarbons will not affect it, even a small amount of fluoride will not corrode obviously; it is an ideal accessory for asphalt concrete mixing plants.