Analysis of the reasons for the low filtration efficiency of the bag filter1

Bag-type dust collector is the current way for many enterprises to remove dust. They all use dust-removing bags to filter suspended particulates in the flue gas. Due to the design of the bag and its own characteristics, the bag-type dust collector is easy to cause blockage and aging. Therefore, the dust removal bag needs to be replaced regularly. Of course, with the continuous use of the dust removal bag, the filtration efficiency will also be reduced due to various reasons. What are the factors that will lead to the filtration efficiency? lower? Summarizing the self-testing process and visiting customers, the following points are summarized for your reference: 1. The particle size of dust is 0.2-0.4μFor dust with a particle size of m, the dust collection efficiency of ordinary dust removal bags is the lowest in the three working states, because the dust particles in this range are in the principle of action of the bag filter."interception"and"Diffusion"The lower limit of , so in 0.2-0.4μDust in the m range is the most difficult to capture. The dust removal efficiency of the bag filter is directly related to the size, severity, shape, electrostatic effect and dust concentration of the particle size. 2. The influence of the dust collector cloth bag on the dust removal efficiency under different dust accumulation conditions The classification efficiency of the same dust removal cloth bag under different working conditions is different, the dust removal efficiency of the cleaning dust cloth bag is the lowest, and the dust removal efficiency after dust accumulation The highest, the dust collection efficiency of the dust bag is reduced after cleaning. It can be seen that the main dust collection function of the bag filter is the dust layer on the surface of the dust bag, which is usually called the secondary filter layer, and the dust bag only plays the role of supporting the dust layer. Therefore, the intensity of cleaning should be appropriate, and a certain thickness of dust layer should be retained to avoid the reduction of dust removal efficiency. 3. Influence of air leakage and resistance Theoretically, the dust removal efficiency of the bag filter can reach 99%, but it cannot be achieved in actual measurement. The main reason is that it is affected by air leakage and resistance. The lower the air leakage rate, the better the dust removal effect. ; The resistance has a certain influence on the dust removal effect of the electrostatic precipitator, and the filter bag is often emptied to reduce the resistance and improve the dust removal effect. The dust hood should be as close as possible to the nodding of the dust production, so that the dust can enter the hood more easily, increase the amount of dust collected, and reduce the pollution of fugitive emissions. 4. The influence of filtration speed The lower the filtration speed, the easier it is to form a primary dust layer with small particle size and large porosity, and the more fine dust particles can be captured. , reducing the filtration efficiency. Of course, the penetration phenomenon can also be overcome by selecting a suitable filter material. In addition, for some filter materials, when the filtration wind speed changes within a certain range, the dust removal efficiency is hardly affected. 5. The bag structure and dust load of the bag filter The dust load deposited on the surface of the bag filter is also directly related to the dust removal efficiency of the bag filter. Experience shows that the use of various dust removal devices can not only improve product quality and reduce costs, but also is the main measure to control dust pollution. The dust removal efficiency, equipment cost and operation cost of various dust collectors are different. When setting up dust collectors, you should have a deep understanding of the performance of various dust collectors, and fully consider the structure of dust generating equipment, types of raw materials and fuels, Operating conditions, the nature and amount of dust-containing gas, the purpose of using the dust collector, the characteristics and value of the dust collected by the bag filter, the amount of dust collected, etc., in order to combine into the most economical dust removal system and ensure appropriate dust removal efficiency. . In the maintenance and management of dust collectors, treatment measures due to different dust properties and changes in operating conditions should also be considered. To sum up, the low filtration efficiency of the common bag filter is basically caused by the above reasons. We provide a professional dynamic and static filter efficiency tester, which is suitable for bag filter, masks, all kinds of filter cloth and other materials testing, welcome Inquire!

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