Bag house is a dry dust filter device. It is suitable for trapping small, dry, non-fibrous dust. Use bag made of felt or non-woven cloth woven using fabric filter dust gas filter effect, when the dusty gas entering the baghouse, the large particles, heavy dust, due to gravity the role of settling down, falling into the hopper, finer dust containing gas through the filter, the dust is retained, the gas purification. Most of the new filter collection efficiency is not high enough. After the media for some time, due to the sieving, collision, retention, diffusion, electrostatic and other effects, filter bag surface layer of accumulated dust, this layer of dust called the primary layer, where the future course of the campaign, became the primary layer the filter layer filters out primarily rely on the role of the primary layer, the larger mesh filter can be obtained a high filtration efficiency. As the dust accumulates in the filter surface, the filter efficiency and resistance are increased correspondingly, when the pressure differential across the filter is large, would some tiny dust particles adhering on the filter squeeze past, precipitator efficiency. In addition, the resistance is too high dust significantly reduced air volume dedusting system. Therefore, precipitator resistance reaches a certain value, to timely cleaning. First layer of soot can not be destroyed, so as not to decrease the efficiency. Bag filter structure is dominated by upper housing part, middle box, lower box (hopper), cleaning system and ash body and other components. Bag house performance is good or bad, in addition to the correct choice of bag material, the cleaning system of baghouse plays a decisive role. To this end, the cleaning method is one of the distinguishing characteristics of bag filter, bag filter is an important part of the operation. The commonly used cleaning methods are: 1, the gas cleaning: gas cleaning by means of high pressure gas or external air backflush filter bag to remove fouling on the bag. Including gas cleaning pulse cleaning, anti-hair cleaning and anti-suction cleaning. 2, the mechanical rapping cleaning: Sectional top rapping cleaning and central rapping cleaning (both in terms of the bag), by means of mechanical rapping devices cyclical rotation rapping bag rows to clear filter fouling on the bag. 3, manual beat: the artificial pat each bag to remove fouling on the bag.
