Abstract: Impurities such as oil mist entrained during natural gas extraction and transportation can affect the reliable operation of equipment such as metering instruments and compressor units in the pipeline system. Using coalescing filters made from filter materials is currently a reliable method for removing oil mist and other impurities. Wettability has been proven to be an important factor affecting the oil mist filtration performance of filter materials, but its specific influencing mechanism remains unclear. This study systematically investigates the effect of wettability on the oil mist filtration performance of filter materials, aiming to address the issues of low filtration efficiency and high filtration resistance in oleophilic filter materials currently used in industry. The results indicate that filter materials with higher oleophobicity exhibit better oil mist filtration performance, manifested primarily as increased filtration efficiency and reduced steady-state pressure drop. Notably, for lower-precision filter materials, superoleophobic materials exhibit a 13.62% increase in filtration efficiency and a 20.46% decrease in steady-state pressure drop compared to oleophilic materials. In experiments with multi-layer filter materials combinations, the results reveal that filter materials with higher oleophobicity exhibit higher filtration efficiency and lower steady-state pressure drop. Combining these findings with the "jump-channel" model, the results suggest that filter materials with higher oleophobicity have lower channel pressure drop. The experimental results of this study provide a reliable theoretical basis for optimizing coalescing filter materials used in the natural gas pipeline transportation industry.

Key words: wettability, superoleophobic, coalescing filtration, performance optimization

摘要： 天然气开采与输运过程中，夹带的油雾等杂质会直接影响管线中计量仪表、压缩机组等设备的可靠运行，由滤材制成的聚结过滤器是目前去除油雾等杂质的可靠设备。润湿性是影响滤材油雾过滤性能的重要因素，但其具体影响规律尚不明确。针对目前工业中使用的亲油滤材过滤效率低、过滤阻力高的问题，本研究系统性地研究了润湿性对滤材油雾过滤性能的影响。结果表明，滤材的油雾过滤性能随滤材疏油性的增强而提升，主要表现为油雾过滤效率增加及稳态压降降低。尤其是针对精度较低的滤材时，改性后的超疏油滤材相较未改性亲油滤材的过滤效率提高13.62%，稳态压降降低20.46%。在多层滤材搭配实验中发现，疏油性较高的滤材具有较高的过滤效率和较低的稳态压降，结合“跳跃-通道”模型分析，疏油性越高的滤材可减少液膜形成及夹带现象，从而降低通道压降。本研究的实验结果可为天然气管道输送工业中聚结过滤器滤材的优化提供可靠的选择。

关键词: 润湿性, 超疏油, 聚结过滤, 性能优化