Why bag house dust removal efficiency is not satisfactory?

Q：Why bag house dust removal efficiency is not satisfactory?

A:First, the nature of the dust. The size of the bag filter dust collection efficiency and the weight, shape, electrostatic effects and dust concentrations are directly related. According to environmental experts for larger particles, heavy large, irregular shape and electrostatic effects are obvious dust, its high collection efficiency. Second, the dust bag performance. Cloth performance have a greater impact on the efficiency and dust resistance. Cloth material shall meet the following conditions: 1, fine dust can block the pass line of fabric interwoven smaller perforations, and the latitude and longitude lines themselves should be fine in order to increase the effective area of the sieve, to reduce the resistance; 2, fabric hair longer and flexible, so that it can cover up the perforations, and has a certain strength; 3, in order to facilitate the use reverse flow cleaning, fabric fluff located dusty air of the contact side. Third, the impact of lower filtration rate filtration rate is more easily formed into a small diameter and particle porosity of a layer of dust, the more it can capture fine dust particles, filtration velocity is too high, increasing the penetration of dust particles on the filter , the filter efficiency. Of course, the phenomenon can also penetrate through the appropriate choice of media to be overcome. In addition, some media, filtration velocity within a certain range, the collection efficiency is hardly affected. Fourth, the impact of the dust layer filter baghouse put into initial operation, no dust layer on the new media, the ability to capture dust at this time is low, with the powder filtration process, gradually formed a layer of dust, dust removal efficiency a corresponding increase, when the dust layer is fully formed, the filtration efficiency up to 99%, less than 1μm for fine dust particles also have a good trapping effect. Fifth, leakage and resistance: Theoretically calculated baghouse dust removal efficiency of 99%, but measured in reach, mainly affect leakage resistance and lower leakage rate, the better the effect of dust; dust resistance have an impact on the effect of electrostatic precipitators, often empty the bag, reduce drag, improve the effect of dust. Dust cover should be as close to the burner, making it easier to enter the dust cover, increase the amount of dust and reduce fugitive emissions.