1, The filter area is determined (1) The total filtration area according to the total gas and dust through the first set of filtration rate, calculated total filter area, we can determine the overall size and dimensions of the bag filter. (2) a single area of a single circular bag area In the process the bag, the bag due to be fixed in the short tube or plate flowers, some even hanging up the cap fixed on the bag, so bag sewing ends need to double or even multi-layered sewing: double seam this part of the system due to increased resistance no longer filter role, but also some intermediate bag fixing ring, this part does not filter effect. (3) determine the total number of bag filter dust bag area and a single area, the number of bags can be calculated. If the number of bags each bag chamber is determined, whereby it can also calculate the number of the rooms throughout the precipitator. Although the press need to determine the number of cells in the precipitator design or selection, but the site layout and maintenance convenience, often room to room with more than six in addition to sitting on the set to double. The chamber 5 is less than the dust of the chambers as a single row. 2, The processing of calculating the amount of gas When calculating bag house gas processing, first requires the amount of gas under conditions of labor, the actual amount of gas through the bag filter, and the filter itself but also consider the amount of air leakage. These data should be determined based on actual operating experience of the existing plant or test data, if the lack of necessary data, according to the amount of gas generated during the production process, and then increase the amount of air entering into the collection hood (about 20% to 40 %) is calculated. It should be noted, if the amount of gas generated in the production process is the amount of gas work state, we need to be in terms of the quantity of gas under standard conditions Selection of comparison. 3, Filtration velocity selection Filtration velocity magnitude, depending on the nature of the dust and gas properties, fabric categories and dust, according to general recommendation dust sample data and select the user’s experience. Most RABH bag filter filtration velocity between 0.6 ~ 13 / m, the pulse bag filter filtration velocity in 1.2 ~ 2m / s or so, the glass fiber filter bag house wind speed of about 0.5 ~ 0.8m / s. 4, Resistance calculation Bag house resistance consists of three parts: (a) Resistance refers to the structure of the apparatus body resistance gas from the dust of the population, to the dust generated by exports; (b) The resistance of the filter bag, dust filter media refers to the resistance, about 50 ~ 150Pa; (c) Resistance the surface layers of dust bag, dust resistance layer is about a clean cloth resistance j ~ 10 times. In addition, the filtration resistance can also be used to calculate the amount of dust in the look-up table approach to determine filtration resistance approximation. Body structure with dust filtration resistance increase wind speed increases, and a variety of different sizes and types of bag house resistance are not the same, therefore, difficult to calculate given expression. General filtration velocity of 0.5 ~ 3m / h, the body resistance is generally between 50 ~ 500Pa. However, when considering the resistance of the body structure, should be considered in a certain amount of reserve.
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