The principle on which it is based is the following: the dust laden gases entering the filter, where they meet a series of cylindrical bags (sleeves). The transport of the gas is ensured by a fan, generally in the queue system to prevent the particulate trashes photo filter online the fan itself, and to keep the plant in depression, also ensuring the necessary photo filter online depression to the point of outlet fumes or chamber combustion. The material they are made of the sleeves is treated so as to have a permeability such as to pass the gas, but not dust, which adheres. In reality the filter made from the fabric of which are composed of the sleeves is only useful for the initial phase of the cycle of use of the sleeve. In fact on the fabric settles quickly a layer of particulates, which is in fact the most effective part of the filter. A shaking system, generally compressed air, allows periodic removal of part of such material (in order to avoid load losses are too high), which is then transported and possibly stored through photo filter online conveying systems (channels fluidized, scraper photo filter online chains, screws, etc. ...). Since the residual emission of the fireplace mainly photo filter online occurs during the stages of shaking, photo filter online the efficiency of the bag filter is increased, ie the smaller the residual emission, the lower the frequency of regeneration of the sleeves request. The choice of the sleeves must take into account several factors, including temperature and chemical aggressiveness of the gases. The materials that make up the sleeves can be divided into macroscopically "tissue" and "felt". In tissues, the pores are formed by the spaces left between a wire and the other; the efficiency of uptake of the tissues can be increased through the application of a membrane, which realizes in fact the uptake of dust. The felts provide greater collection efficiency and can be constituted by microfibers, to be effective also on the particle size finer.
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