Abstract: In natural gas pipeline transportation, the deposition of liquid droplets entrained in the gas could lead to an increase in the transportation resistance and other problems, such as equipment damage and corrosion. Liquid impurities in the gas can be effectively separated by coalescing filtration. However, higher efficiency leads to higher resistance for filter media. To meet the demand for developing high-efficiency and low-resistance filter media for industrial processes, glass fiber filter media as the substrate were used in this study. Patterned filter media with non-uniform wettability were prepared via surface modification. The effects of strip pattern arrangement, pattern spacing and number, and the number of filter material layers on the filtration performance were investigated. The results showed that the pressure drop could be reduced for filter media with staggered and overlapped arrangements of the modified areas. More dispersed oleophobic areas led to a more significant reduction of the pressure drop. When the pattern spacing was 5 mm and the number of patterns was 16, the filter media had the lowest saturation and steady-state pressure drop, and the steady-state pressure drop was reduced by 37% compared with that of the untreated filter media. For multi-layer patterned filter media, when the number of layers was the same, the liquid transport path in the filter media with the optimal pattern arrangement was shorter, resulting in a more significant decrease in pressure drop.

Key words: natural gas, coalescence, pattern, pressure drop, saturation

摘要： 天然气管道运输过程中，气体内夹杂的液滴在输气管道内部沉积后将导致气体输送阻力增大，同时也会造成设备损坏和腐蚀等问题。聚结过滤可有效分离气体中的液态杂质，然而过滤材料效率越高其阻力也随之增大。针对实际工业过程高效低阻过滤材料的研发需求，本工作以玻璃纤维滤材为介质，通过表面改性方法制备得到具有非均匀润湿性图案化结构材料，进而探究条状图案排布方式、图案间距与数量及滤材层数对滤材过滤性能的影响。结果表明，滤材改性区域进行交错排布及重叠排布均能够降低压降，且疏油区域越分散，压降降低越明显；图案间距为5 mm且图案数量为16时，滤材具有最低的饱和度和稳态压降，其中稳态压降相较于未改性滤材降低37%；针对多层图案化滤材，层数相同时，最优图案化排布滤材内液体运移路径更短，压降降低效果更为显著。

关键词: 天然气, 聚结, 图案化, 压降, 饱和度