Currently dust removal system on asphalt mixing plants have adopted the basic dust bag system, it is more commonly used type of container removal system, an inertial dust collector, two for the bag filter. Inertial dust particle size of 40 ~ 50μm collection of large particles, these large particles can be recycled as a fine aggregate, the remaining dust and gas into the secondary bag house dust, collected more than a particle diameter of 0.3μm, 40μm or less the dust, these dust particles can be used as slag recycling, not only achieve the effect of dust, and can save raw materials, to meet customer demand. And this kind of bag filter compact appearance, high collection efficiency. Two bag house this unique design, large filtration area and easy to clean, high and low temperature alarm, ultra-high temperature automatic protection device. Use insulation type box, bag use NOMEX, through acupuncture nonwoven made of high temperature, acid filtration material and dust emission concentration is less than 25mg / Nm3 or less. But with fuel prices rising, in order to reduce costs, asphalt mixing plant from the original diesel fuel as fuel, and now many manufacturers have to use heavy oil, coal or other foreign oil as fuel, and heavy oil but also the amount of sulfur heavy oil, in sulfur content of heavy oil, low sulfur heavy oil, asphalt mixing plant led to the burning smoke smoke components more complex, or more different fuels for generating different working conditions of NOMEX needle felt filter after taking a different treatment, can greatly improve the collection efficiency and bag life. In a bag house asphalt mixing plants as an example, its production capacity is 180 to 240 tons per hour, the flue gas inlet temperature is less than 200 ℃, finished material temperature 140 ℃ ~ 180 ℃, because the fuel is heavy, so in smoke contains a certain acid gases, and fumes from the main aggregate drying system and heavy oil combustion residues, fine dust particles, and sticky, and sometimes aggregate moisture content is relatively large, it will produce a large amount of water vapor when drying. According to the above conditions, the choice of filter media oil, water NOMEX high temperature needle felt filter.
