Looking at the emissions by source of fine dust in Korea, as of 2020, emissions from the industrial sector accounted for 30%, and about 45% of fine dust emission reduction facilities operated accordingly are dust filters that use filters to remove particulate matter. This can be expected to have a greater ripple effect in the fine dust problem than other methods if the performance of the currently operated dust filter is supplemented and the technology is developed and spread. As particulate matter is collected in the bag filter, a pressure loss is inevitably generated by the dust accumulated on the surface of the bag filter. Therefore, a process of periodically bag cleaning the accumulated dust layer is required, which is called bag cleaning. After cleaning, the dust collection efficiency temporarily decreases and the emission concentration increases. This means that the dust collection performance of the bag filter can directly influence the performance of the dust collector. Although studies on improving the performance of bag filters are in progress in various directions, this study paid attention to the filter surface treatment technology.
Currently, the surface of the filter through which gas flows is treated in various ways to improve the performance of the bag filter. The experiment was carried out on a 50 m3/min impact air flow pulse jet type bag filter with surface treatment of calendering, singeing, nano ePTFE membrane coating, and ePTFE membrane coating, respectively. Bag filters were installed to compare and evaluate the cleaning and dust collection performance. In addition, the basic physical properties and filtration characteristics of the filter media used in the four types of bag filters were identified, and the dust removal and dust collection performance test results of the bag filters were analyzed. As a result of the experiment, it was found that the membrane-coated filter can effectively reduce the concentration of dust discharged during cleaning. In addition, it was found that the filter surface treatment can determine the cleaning and dust collection performance of the bag filter and consequently influence the performance of the bag filter.