聚结层排布对高压天然气净化用滤芯过滤性能影响的实验研究

本工作利用聚结滤芯过滤性能实验装置，通过改变滤芯内部的滤材排布，研究了聚结层为单一滤材以及由不同滤材排布组合的滤芯过滤性能，分析了聚结层排布方式对过滤效率、压降、饱和度及液体分布的影响。结果表明，由单一滤材组成的滤芯过滤效率随滤材孔径减小而增大，但孔径最小时由于压降较高，导致滤芯综合过滤性能反而最差。疏油在前、亲油在后的聚结层排布方式可提高滤芯过滤效率、减少液滴二次夹带，且以两层相同滤材交错排列的滤芯过滤效率比单层滤材交错排列明显更高，压降也相对较低，使得综合过滤性能显著提升。继续增加进气侧的疏油滤材层数可延缓压降增长、提高运行寿命，滤芯稳态品质因子达到最大值(0.30 kPa-1)。聚结层排布方式对滤芯过滤性能的影响主要通过改变液体分布形式而实现，且末层滤材的通道结构变化是导致不同聚结层排布方式的滤芯过滤性能出现差异的主要原因。

Experimental study of effect of coalescence layer arrangement on filtration performance of filter for high-pressure natural gas purification

In the field of high-pressure natural gas purification, it is a challenging problem to improve the performance of coalescence filter element. In this work, the filtration performance of filter elements with the same coalescence filter materials and combination of different coalescence filter materials were studied, and the effects of the arrangement of coalescence layers on the filtration efficiency, pressure drop, saturation and liquid distribution were analyzed by using the experimental device for the filtration performance of coalescence filter element. The results showed that the filtration efficiency of the filter element composed of the same filter materials increased with the decreasing pore size of filter material, but due to the higher pressure drop, the overall filtration performance was the worst for the minimum pore size case. The coalescence layer arrangement of oleophobic layer in front and oleophilic layer in back could improve the filtration efficiency of the filter element and reduce the secondary entrainment of droplets. The filtration efficiency of the filter element staggered with two layers of the same filter material was significantly higher than that of the single-layer filter material, and the pressure drop was relatively low, which greatly improved the overall filtration performance. Further increase of the number of oleophobic layers on the inlet side delayed the increase of pressure drop and improved the operation life, and the steady-state quality factor of the filter element reached the maximum value (0.30 kPa-1). The influence of coalescence layer arrangement on the filtration performance of filter element was mainly realized by changing the liquid distribution form, and the channel structure change of last filter layer was the main reason for the filtration performance difference of filter elements with various coalescence layer arrangements.