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Reasons why high-efficiency filters do not meet the standards
Reasons why high-efficiency filters do not meet the standardsThe function of high-efficiency filters is mainly to capture particulate dust and various suspended solids, as the end treatment of various filter ends, that is, it is a link in the filtration. Due to the strict requirements of the use site, high-efficiency filters must be tested one by one before leaving the factory, and can only be put into use after passing the test. The filter test includes factory inspection and on-site inspection. During these two test processes, the reasons why the high-efficiency filter does not meet the standard may involve multiple aspects, including design, manufacturing, installation, use, and maintenance.1. Design factors Irrational design: pore size, material selection, structural layout, etc. cannot effectively capture and intercept particulate matter, which will directly affect its filtration effect and fail to meet the standard. Insufficient filtration area: If the designed filtration area is insufficient, the particulate matter cannot be effectively dispersed when handling the air volume, thereby reducing the filtration effect. 2. Manufacturing factors Manufacturing process defects: During the manufacturing process, if there are problems such as poor sealing, poor welding, improper material handling, etc., the filter performance will be reduced and the expected filtration effect cannot be achieved. Lax quality control: Lax quality control during the manufacturing process, such as using inferior materials and ignoring the inspection process, may cause the filter performance to fail to meet the standards. 3. Filter material factors The filter material itself is inefficient: If the efficiency of the filter material itself does not meet the requirements (the definition of high-efficiency filter material: the filtration efficiency of 0.3μm dust is ≥99.97% when tested at a wind speed of 5.3cm/s), it is impossible to manufacture a qualified filter. Material dust generation: Traditional high-efficiency filters with partitions, if the partitions are paper partitions, and the raw materials are not strictly controlled, there is a risk of dust generation on the paper partitions. The filter material production environment is poor, the filter material itself carries a large amount of dust that may fall off, and the filter made may also generate dust. It is worth noting that some inspection methods cannot detect this type of dust generation. 4. Installation factors Improper installation position: If the high-efficiency filter is installed in an inappropriate position, such as in a dead corner of the airflow or an eddy current area, it will seriously affect its filtering effect. Poor sealing: Poor sealing during installation will cause particles to bypass the filter and enter the clean area, thereby reducing the filtration efficiency. Non-standard installation process: If the standard operation process is not followed during the installation process, such as excessive installation force causing deformation of the filter, unclean connection pipes causing secondary pollution, etc., the filtering effect will be affected. 5. Detection factors: There may be errors in the test process, such as inaccurate test equipment and non-standard test methods, which may cause the performance of the filter to be misjudged as substandard. In many cases, after the filter is installed, people use the downstream dust concentration to judge whether the filter is qualified. At this time, even if the filter efficiency is competent, it may be misjudged as unqualified due to high downstream concentration. In addition, during use, long-term overload operation, lack of regular maintenance, improper operation of personnel, and use environments, such as high-temperature environments, high humidity environments, and high pollution environments, factors will cause the performance of the filter to deteriorate, so we need to comprehensively consider and strictly control multiple links such as design, manufacturing, installation, use, and maintenance. At the same time, regular performance testing and maintenance of the filter is also an important means to ensure that its performance meets the standards. |
