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 material increased, and the pore size of the material decreased significantly after 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 rose because more oil droplets were transported per unit time through filter,. The initial pressure drop grew up with the increase of filter apparent 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.
Jing CHEN Zhongli JI Zhen LIU
. Testing and optimization of gas-liquid filtration performance of folded filter[J]. The Chinese Journal of Process Engineering, 2019
, 19(4)
: 775
-782
.
DOI: 10.12034/j.issn.1009-606X.218301
李柏松. 天然气净化用滤芯的气液过滤性能研究[D]. 中国石油大学(北京), 2009.
Li B S，Study on Gas-liquid Separation Performance of Filters for Natural Gas Purification [D]. China University of Petroleum (Beijing), 2009.
常程, 姬忠礼, 黄金斌,等. 气液过滤过程中液滴二次夹带现象分析[J]. 化工学报, 2015, 66(4):1344-1352.
Chang C, Ji Z L, Huang J B, et al. Analysis of re-entrainment in process of gas-liquid filtration[J]. CIESC Journal, 2015, 66(4):1344-1352.
Chang C, Ji Z, Liu C, et al. Permeability of filter cartridges used for natural gas filtration at high pressure [J]. Journal of Natural Gas Science & Engineering, 2016, 34:419-427.
Hajra M G, Mehta K, Chase G G. Effects of humidity, temperature, and nanofibers on drop coalescence in glass fiber media[J]. Separation & Purification Technology, 2003, 30(1):79-88.
Kampa D, Wurster S, Meyer J, et al. Validation of a new phenomenological “jump-and-channel” model for the wet pressure drop of oil mist filters [J]. Chemical Engineering Science, 2015, 122:150-160.
陈仕林, 刘震, 宫敬,等. 高压条件下聚结过滤滤芯性能的影响因素[J]. 油气储运, 2018(2).
Chen S L, Liu Z, Gong J, et al. Factors influencing the performance of filter element for coalescence filtration under high pressure[J].Oil & Gas Storage and Transportation,2018(2).
陈锋, 姬忠礼, 齐强强. 孔径梯度分布对亲油型滤材气液过滤性能的影响[J]. 化工学报, 2017, 68(4):1442-1451.
Chen F, Ji Z L, Qi Q Q. Influence of pore size distribution on gas-liquid filtration performance of oleophilic filters [J]. CIESC Journal, 2017, 38(9): 1442–1451.
Liu Z, Ji Z, Zhang J, et al. Influence of Processing Parameters on Gas-liquid Filtration Performance of Fibrous Filter Cartridge ☆[J]. Procedia Engineering, 2015, 102:911-920.
Charvet A, Gonthier Y, Gonze E, et al. Experimental and modelled efficiencies during the filtration of a liquid aerosol with a fibrous medium[J]. Chemical Engineering Science, 2010, 65(5):1875-1886.
Kampa D, Wurster S, Buzengeiger J, et al. Pressure drop and liquid transport through coalescence filter media used for oil mist filtration [J]. International Journal of Multiphase Flow, 2014, 58(58):313-324.
Wurster S, Kampa D, Meyer J, et al. Measurement of oil entrainment rates and drop size spectra from coalescence filter media [J]. Chemical Engineering Science, 2015, 132:72-80.
Wurster S, Meyer J, Kolb H E, et al. Bubbling vs. blow-off – On the relevant mechanism(s) of drop entrainment from oil mist filter media [J]. Separation & Purification Technology, 2015, 152:70-79.
Kolb H E, Meyer J, Kasper G. Flow velocity dependence of the pressure drop of oil mist filters[J]. Chemical Engineering Science, 2017, 166:107-114.
Jeffery A B, Bakis G, Skelton J. High-efficiency, self-supporting filter element made from fibers: US, US 5456836 A[P]. 1995.
Vasudevan G, Chase G G. Performance of B–E-glass fiber media in coalescence filtration [J]. Journal of Aerosol Science, 2004, 35(1):83-91.
Hutten I. Fiberrich -An Alternative to Phenolic Treated Filter Paper for Automatic Lube Oil Filtration [J]. FLUID PARTICLE SEPARATION JOURNAL, 1998, 11: 314-321.
Mcconnell R L, Meyer M F, Petke F D, et al. Polyester binders in nonwovens and other textile applications[J]. Journal of Coated Fabrics, 1987, 16(3): 199-208.
Liu Z, Ji Z, Shang J, et al. Improved Design of Two-stage Filter Cartridges for High Sulfur Natural Gas Purification [J]. Separation & Purification Technology, 2017.
Institution B S. Iso 8573-2 - Compressed Air - Part 4: – Part 2 Test Methods for Aerosol Oil Content [J].
Wurster S, Meyer J, Kasper G. On the relationship of drop entrainment with bubble formation rates in oil mist filters[J]. Separation & Purification Technology, 2017, 179:542-549.
