折叠滤芯气液过滤性能测试及优化

Testing and optimization of gas-liquid filtration performance of folded filter

采用聚结型滤芯气液过滤性能实验装置,研究了油雾加载率和表观过滤速度对折叠滤芯过滤性能的影响及涂覆粘合剂对折叠滤芯过滤性能的优化作用。结果表明,涂覆粘合剂后,滤材抗张力强度明显增大,滤材孔径减小。随油雾加载率增大,滤芯过滤层液体运移通道数增加,通道压降升高。初始压降随表观过滤速度增加而升高。粘合剂主要凝固在渗透性低的区域,压降变化较小。表观过滤速度增加抑制了二次夹带,折叠滤芯过滤效率升高,而由于粘合剂脱落,涂覆粘合剂的滤芯过滤效率下降。表观过滤速度为0.10 m/s时,随油雾加载率增大,聚结在滤材表面的粘合剂抑制夹带,滤芯过滤效率升高。

Clean environment is required in many industrial processes, such as pharmaceutical production, large rotating machinery crankcase ventilation and petroleum refining, because liquid droplets can corrode and clog the equipment. As an important branch of filtration, the purpose of gas-liquid filtration is to effectively remove liquid droplets from gas. In this work, according to the ISO-8573-2 standard, a gas-liquid filtration performance testing system of folded filter was established. The effect of oil mist loading rate and filter apparent velocity on the gas-liquid filtration performance of cylinder folded filter element were studied. The effects of the coating binder on the filter surface pressure drop and filtration efficiency were analyzed.The results showed that the tensile strength of the filter materialincreased, and the pore size of the material decreasedsignificantlyafter coating binder. Filtration pressure drop of folded filter had the same trend as that of winding filter because of the same filtration mechanism. With the increase of the oil mist loading rate, the number of liquid transport channels in the filter layers increased, and channel pressure drop rosebecause more oil droplets were transported per unit time through filter,. The initial pressure drop grew up with the increase of filterapparent velocity. The binder mainly coalesced in the area where the filter glass fiber was dense and low permeability, because of uneven glass fibre.Coating binder had less influence on the pressure drop of the folding filter.With the increase of filter apparent velocity, the filtration efficiency increased, because entrainment was inhibited. In the case of high concentration and low filter apparent velocity, due to binder coalesced on filter material inhibits entrainment, the filtration efficiency increased obviously. The binder peeled off as filter apparent velocity increased, and the filtration efficiency of filter coated with binder decreased significantly.