天然气用纤维过滤器非稳态性能实验研究

针对天然气工业特点，设计了一套滤芯性能在线检测装置，采用光学粒子计数器OPC对过滤器上、下游粉尘的浓度和粒径分布进行适时测量。使用多分散性粉尘，在实验室内测试了天然气用纤维过滤器的非稳态性能，以及各种操作参数对其性能的影响规律。实验结果表明，纤维过滤器的过滤效率和阻力均随粉尘负荷的增加而增加，根据其变化趋势可分为深层过滤和滤饼过滤两个阶段。过滤速度过高容易导致大粒子穿透，从而使效率下降，纤维过滤器的表观过滤速度应低于0．06m／s；相对湿度和滤材厚度的增加有利于增大过滤效率，但也会导致阻力的迅速增加。

Experimental study of dynamic filtration performance of natural gas fibrous filter

An on-line natural gas filter element testing unit was built up, and an optical particle counter was used to,simultaneously measure the upstream and downstream aerosol of the filter. The dynamic performance during fibrous filter clogging and the effect of various parameters on filtration performance were investigated using polydisperse ashes. The results show that the filtration efficiency increases with dust loading, which can be described in two stages, depth filtration and cake filtration, just being like pressure drop. The leakage of big particles should be responsible for the poor efficiency at high filtration velocity and the optimal face velocity ought to be smaller than 0. 06 m/s. Filtration efficiency can be improved by selecting thick filter media and increasing relative humidity, but the resistance will also increase.