Early asphalt mixing plant is configured to filter out dry cyclone dust due to the dry cyclone can only remove large particles (> 5μm) dust particles that are present in large amounts of less than 5μm fine dust, so dust efficiency is generally only 75% to 85%. With the development of improved environmental requirements and dust removal technology, asphalt mixing equipment to take secondary dedusting meet the requirements of exhaust gas emissions. Usually asphalt mixing equipment commonly used in dust removal equipment dry dust, wet dust collector, bag filter. Used as a dry dust precipitators, wet dust and dust bag two kinds used as a secondary dust, dust can take different ways according to different requirements. Wet precipitator structure is relatively simple, low cost, there are a variety of spray and cultural structure type Venturi, etc., to achieve a certain effect of dust. But there is no secondary pollution problem because dust in the waste recycling process will be gradual acidification, acidification of water in the flue gas of sulfur, nitrogen and other steel will have a corrosive effect, any formation of secondary emissions on the surrounding environment pollution, thus wet scrubber used asphalt mixing equipment has been dwindling. Baghouse has proved to be ideal for asphalt mixing equipment dust removal system that can filter out more than 0.5μm dust, dust effect, dust emission concentration is less than 50mg / Nm3. Currently there are baghouse air cleaning, air and pulse jet cleaning three types. Air cleaning system is the use of negative pressure and atmospheric pressure of the atmosphere into the bag were cleaning work, due to the pressure difference is small, a small disturbing force cleaning must therefore be extended cleaning time and requires increased filtration area, so as to meet dust needs, and thus the volume of air cleaning filter is generally larger; pulse cleaning using high-pressure air blowing bag it in a short time jitter thereby removing dust adhered to the bag, since the injection time is short and large injection force, adhering to the dust bag is easy to fall, short of blowing dust cleaning almost does not affect the operation, and thus the volume of pulse jet dust collector is generally small, but you need to configure high-pressure gas source and pulse valves and other devices. The main components of the bag filter bag due to prolonged work under high temperature conditions, but also due to the sulfur in the fuel and nitrogen acids and other ingredients formed during combustion perishable bag, so bag material must be temperature acid. In addition, anti-rust dust box is also important, since sulfur, nitrogen and other elements are present in the fuel, during combustion in the oxidation becomes acidic, into the dust box after the inside walls of corrosive, thus requiring the inside walls apply coating or preservative material. Raise new bag filter technology more focused on how to improve the cleaning effect of the bag, corrosion resistance and oil and water repellent properties, such as changing the location of the disturbance and increased pulse bag nozzle air entrainment and the like.

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