Application analysis of PPS+PTFE blended needled filter bags in coal-fired power plants
In order to solve the problem that polyphenylene sulfide (PPS) filter bag was damaged in a large-scale within less than one year after it was used in a coal-fired power plant, PPS and polytetrafluoroethylene (PPS+PTFE) blended needled filter bags with different mass ratios of PPS to PTFE fiber were prepared, and the filter bags hanging test was carried out. The properties of PPS+PTFE blended needled filter bags before and after use were analyzed from the aspects of surface density, air permeability, tensile properties, dust penetration, changes in functional groups and micro-morphology. Based on the test data, the service life of PPS+PTFE blended needled filter bags was estimated and the remaining service life was calculated. The results showed that the prepared PPS+ PTFE blended needled filter bags could meet the requirement of dust emission mass concentration below 10 mg/m3 for a long period of time. It was estimated that the overall service life of PPS+PTFE blended needled filter bags with a 50∶50 mass ratio of PPS to PTFE fibers in the top layer could reach 74 months.The research provides reference for the ultra-low emission of filter bag dust collector and filter bag selection in coal-fired power plants.
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