Abstract The metal web filter media has been widely used to purify high-temperature exhaust gas because of its good durability and reliability. Although it has fine high-temperature resistance, its filtration efficiency for fine particles is relatively low. In this study, we developed a new type of composite filter of metal web coated with polytetrafluoroethylene (PTFE) membrane, which combined the high-temperature resistance of the metal web filter and the excellent filtration performance of the membrane-coated filter media. The performance parameters of the composite filter, including pressure drop, filtration efficiency, regeneration efficiency, adhesive force, and high-temperature resistance, were investigated experimentally, and compared with those of the metal web filter and polyester fiber coated with PTFE membrane filter. Although the composite filter yielded a higher pressure drop, it exhibited a high particle collection efficiency. At a face velocity of 10.23 cm/s, the filtration efficiency of the composite filter was 99.32 %. This was 1.23 and 0.10 % higher than that of the metal web filter and polyester coated with PTFE membrane filter, respectively. In addition, the composite filter has the characteristics of small cake/fabric adhesion force, low residual pressure drop, high regeneration efficiency, and long cleaning interval. The average cleaning interval and residual pressure drop of the composite filter were 421 s and 425.0 Pa, respectively, whereas those of the metal web filter were 291 s and 658.5 Pa, respectively; those of the polyester coated with PTFE membrane filter were 415 s and 443.2 Pa, respectively. Furthermore, the filtration test at high temperatures and thermogravimetric analysis demonstrated that the composite filter has an excellent thermal stability. At a temperature of 260 °C, the average dust emission concentration of the polyester coated with PTFE membrane filter was 2.86 times larger than that of the composite filter (0.532 mg/m3).

中文翻译：

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聚四氟乙烯微孔膜包覆提高金属网过滤介质的过滤和脉冲喷射清洗性能

摘要 金属网过滤介质因其良好的耐用性和可靠性而被广泛用于净化高温废气。虽然它具有优良的耐高温性能，但它对细小颗粒的过滤效率相对较低。在这项研究中，我们开发了一种新型的金属网包覆聚四氟乙烯（PTFE）膜复合过滤器，它结合了金属网过滤器的耐高温性和覆膜过滤介质的优良过滤性能。实验研究了复合过滤器的压降、过滤效率、再生效率、附着力、耐高温性能等性能参数，并与金属网过滤器和聚酯纤维包覆聚四氟乙烯膜过滤器的性能参数进行了比较。虽然复合过滤器产生较高的压降，但它表现出较高的颗粒收集效率。在 10.23 cm/s 的面速度下，复合过滤器的过滤效率为 99.32%。这分别比金属网过滤器和涂有 PTFE 膜过滤器的聚酯高 1.23% 和 0.10%。此外，复合过滤器具有滤饼/织物粘附力小、残余压降低、再生效率高、清洗间隔长等特点。复合过滤器的平均清洗间隔和残余压降分别为421 s和425.0 Pa，而金属网过滤器的平均清洗间隔和残余压降分别为291 s和658.5 Pa；涂有聚四氟乙烯薄膜过滤器的聚酯分别为 415 s 和 443.2 Pa。此外，高温过滤试验和热重分析表明该复合过滤器具有优良的热稳定性。在260℃温度下，涂有聚四氟乙烯膜过滤器的聚酯的平均粉尘排放浓度是复合过滤器（0.532mg/m3）的2.86倍。