湿度对袋式除尘性能的强化研究
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摘要
针对袋式除尘过程中运行阻力较高的问题,提出了一种通过调控湿度、改变颗粒间作用力来强化袋式除尘性能的方法,系统考察了湿度对颗粒间作用力的影响;为扩大研究的普适性,采用在高湿环境下更不易形成液桥的疏水性滑石粉作为模拟粉尘,并采用聚四氟乙烯(PTFE)覆膜滤料作为过滤介质,研究了湿度对滤饼空隙率、滤饼过滤阻力、荷尘量、除尘效率等除尘性能的影响。结果表明,颗粒间黏附力随湿度增加而增大。一定湿度范围内,含尘气体湿度越高,过滤阻力越小,除尘性能越好。通过提高湿度,在最优条件下,单位荷尘量下滤饼过滤阻力可降为原来的6%。
A method of inter-particle force adjustment by regulating humidity was proposed to reduce filtration resistance and achieve better bag filter performance. Effects of humidity on inter-particle forces were studied. Hydrophobic talcum powder not easy to form liquid bridge under high humidity was used as model dust for universal application, and a poly tetrafluoroethylene(PTFE) microporous membrane was used as filter media. Effects of humidity on bag filter performance were investigated by measuring cake porosity, cake filtration resistance, cake area load and dust removal efficiency. The results show that inter-particle forces increase with the increase of humidity. The filtration resistance decreases and the bag filter performance enhances as humidity increases within certain range. The cake filtration resistance of unit dust loading can be reduced to 6%under optimal conditions.
A method of inter-particle force adjustment by regulating humidity was proposed to reduce filtration resistance and achieve better bag filter performance. Effects of humidity on inter-particle forces were studied. Hydrophobic talcum powder not easy to form liquid bridge under high humidity was used as model dust for universal application, and a poly tetrafluoroethylene(PTFE) microporous membrane was used as filter media. Effects of humidity on bag filter performance were investigated by measuring cake porosity, cake filtration resistance, cake area load and dust removal efficiency. The results show that inter-particle forces increase with the increase of humidity. The filtration resistance decreases and the bag filter performance enhances as humidity increases within certain range. The cake filtration resistance of unit dust loading can be reduced to 6%under optimal conditions.
引文
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[20]丁波,任钟旗,刘君腾,等.一种袋式除尘器中滤饼的固定方法:中国, 201 010 272 804.9[P]. 2010-12-15.DING B, REN Z Q, LIU J T, et al. A method of fixing cake in bag filter:CN, 201 010 272 804.9[P]. 2010-12-15.
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[2] EDELMAN L. Air filtration:Air filter media an industry evolves[J]. Filtration&Separation, 2008, 45(9):24-26.
[3] CHEN Y S, HSIAU S S. Influence of?ltration super?cial velocity on cake compression and cake formation[J]. Chemical Engineering and Processing, 2009, 48(5):988-996.
[4] WAKEMAN R. The influence of particle properties on?ltration[J]. Separation and Puri?cation Technology, 2007, 58(2):234-241.
[5] THONGLEK V, KIATSIRIROAT T. Agglomeration of sub-micron particles by a non-thermal plasma electrostatic precipitator[J].Journal of Electrostatics, 2014, 72(1):33-38.
[6]张光学,刘建忠,王洁,等．声波团聚中尾流效应的理论研究[J].高校化学工程学报, 2013, 27(2):199-204.ZHANG G X, LIU J Z, WANG J, et al. Theoretical study of acoustic wake effect in acoustic agglomeration[J]. Journal of Chemical Engineering of Chinese Universities, 2013, 27(2):199-204.
[7] MOLDAYSKY L, FICHMAN M, GUTFINGER C. Enhancing the performance of fibrous filters by means of acoustic waves[J].Aerosol Science, 2006, 37(4):528-539.
[8]马德刚,林伟强,郑琪琪,等.声凝并联合雾化预处理及其在过滤除尘中的应用[J].环境工程学报, 2015, 9(15):2353-2358.MA D G, LIN W Q, ZHENG Q Q, et al. Pretreatment based on combined effect of acoustic agglomeration and atomization and its application in air filtration[J]. Chinese Journal of Environmental Engineering, 2015, 9(15):2353-2358.
[9] ZHOU D, LUO Z, JIANG J, et al. Experimental study on improving the efficiency of dust removers by using acoustic agglomeration as pretreatment[J]. Powder Technology, 2016, 289:52-59.
[10] ZHAO L, LI X L, SUN W Q, et al. Experimental study on bag filtration enhanced by magnetic aggregation of fine particles from hot metal casting process[J]. Powder Technology, 2018, 327:255-266.
[11] LI Y W, ZHAO C S, WU X, et al. Aggregation experiments on fine fly ash particles in uniform magnetic field[J]. Power Technology, 2007, 174(3):93-103.
[12] ZHANG G, ZHANG L, WANG J, et al. Improving acoustic agglomeration efficiency by addition of sprayed liquid droplets[J].Powder Technology, 2017, 317:181-188.
[13] KIM J H, LIANG Y, CHOI J H, et al. Temperature effect on the pressure drop across the cake of coal gasification ash formed on a ceramic filter[J]. Powder Technology, 2008, 181(1):67-73.
[14] KINNARINEN T, TUUNILA R, HAKKINEN A, et al. Reduction of the width of particle size distribution to improve pressure filtration properties of slurries[J]. Minerals Engineering, 2017, 102:68-74.
[15]葛亚勤.超声雾化对微细粉尘过滤性能影响研究[D].北京:北京化工大学, 2010.GE Y Q. The effect of ultrasonic atomization on behavior of fine dust in air-filtration process[D]. Beijing:Beijing University of Chemical Technology, 2010.
[16]杨振楠,郭庆杰,李金惠.气氛与湿度对燃煤飞灰颗粒声波团聚的影响[J].化工学报, 2011, 62(4):1055-1061.YANG Z N, GUO Q J, LI J H. Effect of atmosphere and relative humidity on particle agglomeration of fly ash in acoustic wave[J].CIESC Journal, 2011, 62(4):1055-1061.
[17] PAYAM A F, MORTEZA F. A capillary force model for interactions between two spheres[J]. Particuology, 2011, 9:381-386.
[18] BOCQUET L, CHARLAIX E, CILIBERTO S, et al. Moisture-induced ageing in granular media and the kinetics of capillary condensation[J]. Nature, 1998, 396:735-737.
[19]王庚.膨体聚四氟乙烯(ePTFE)覆膜滤料过滤性能的研究[D].北京:北京化工大学, 2004.WANG G. The study of behavior of ePTFE membrane filter in air-filtration process[D]. Beijing:Beijing University of Chemical Technology, 2004.
[20]丁波,任钟旗,刘君腾,等.一种袋式除尘器中滤饼的固定方法:中国, 201 010 272 804.9[P]. 2010-12-15.DING B, REN Z Q, LIU J T, et al. A method of fixing cake in bag filter:CN, 201 010 272 804.9[P]. 2010-12-15.
[21] YANG R Y, ZOU P R, YU A B. Computer simulation of the packing of fine particles[J]. Physical Review E, 2000, 62(3):3900-3908.
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