低频声波作用下液滴气溶胶的团聚特征与机理分析Characterization and mechanism of droplet aerosol agglomeration under the effect of low-frequency acoustic waves
刘恒源,仲兆平,聂君乐,许月阳,杨宇轩,周峻伍,李怡辉
摘要(Abstract):
工业中会产生大量液滴,若不经处理会造成浪费或污染,甚至带来安全隐患。为了探究声波对液滴气溶胶的团聚效果,搭建了实验平台,通过激光测试系统来对液滴气溶胶的透光率进行实时监测,主要研究了有无声波、声波频率、声压级、初始液滴质量浓度对液滴团聚的影响,还进行了团聚机理的分析。结果表明:声波作用下,液滴气溶胶快速发生消散,在10 s内透光率达到68%,而无声波时透光率60 s内未发生变化;在声波频率为1 000 Hz时,液滴团聚效果最好,并通过携带系数和相对携带系数的计算,表明该频率下同向团聚机理起主要作用;声压级越高,液滴气溶胶透光率变化越快,团聚效果越好,但声压级不能过高,否则会使得能耗增加,还会引起非线性效应而限制团聚效果的提升;初始液滴质量浓度越高,团聚速率越快,这是因为单位体积内液滴数目更多,液滴之间间距更小,更易发生碰撞团聚。该研究揭示了液滴气溶胶的团聚特征和机理,为工业生产过程中液滴的有效控制提供了重要的理论指导。
关键词(KeyWords): 声波团聚;液滴;气溶胶;团聚;透光率
基金项目(Foundation): 低碳智能燃煤发电与超净排放全国重点实验室开放课题(D2024FK165)
作者(Author): 刘恒源,仲兆平,聂君乐,许月阳,杨宇轩,周峻伍,李怡辉
参考文献(References):
- [1]周栋,骆仲泱,鲁梦诗,等.单分散气溶胶的声波团聚实验[J].浙江大学学报(工学版),2017, 51(2):358-362, 369.ZHOU D, LUO Z Y, LU M S,et al. Acoustic agglomeration experiments of monodispersed aerosol[J].Journal of Zhejiang University(Engineering Science), 2017, 51(2):358-362, 369.
- [2]张瑞翔,王鹏,伍婷婷,等.声波与喷雾对于飞灰颗粒团聚的影响[J].化工进展,2020, 39(3):858-863.ZHANG R X, WANG P, WU T T,et al. Influence of acoustic wave and water spray on the agglomeration of fly ash particles[J].Chemical Industry and Engineering Progress, 2020, 39(3):858-863.
- [3] LIU C, ZHAO Y, TIAN Z F,et al. Numerical simulation of condensation of natural fog aerosol under acoustic wave action[J].Aerosol and Air Quality Research, 2021, 21(4):200361.
- [4] YUAN D K, ZHANG G X, LIN C Y,et al. Fast elimination of cable fire smoke in underground tunnels using acoustic agglomeration technology[J].Tunnelling and Underground Space Technology, 2021, 117:104154.
- [5]柳晓琳,杜健敏,刘恒,等.声波团聚耦合技术在去除烟气细颗粒物中的应用进展[J].现代化工,2022, 42(8):85-88.LIU X L, DU J M, LIU H,et al. Application of acoustic agglomeration coupled technology in removing fine particles from flue gas[J].Modern Chemical Industry, 2022, 42(8):85-88.
- [6]张光学.燃煤飞灰气溶胶声波团聚的理论和实验研究[D].杭州:浙江大学,2010.ZHANG G X. Experimental and theoretical studies on acoustic agglomeration of coal-fired fly ash[D]. HangZhou:ZheJiang University,2010.
- [7]张光学,朱颖杰,周涛涛,等.喷雾对促进细颗粒物声波团聚的影响[J].化工学报,2017, 68(3):864-869.ZHANG G X, ZHU Y J, ZHOU T T,et al. Improve acoustic agglomeration of fine particles by droplet spray[J].CIESC Journal,2017, 68(3):864-869.
- [8]陶威,徐超,仲兆平.低浓度细颗粒物声波团聚及喷雾优化实验[J].环境工程,2020, 38(10):162-168, 127.TAO W, XU C, ZHONG Z P. Experimental study on acoustic agglomeration and combined spray optimization of fine particles at low concentration[J].Environmental Engineering, 2020, 38(10):162-168, 127.
- [9] YAN J P, CHEN L Q, YANG L J. Combined effect of acoustic agglomeration and vapor condensation on fine particles removal[J].Chemical Engineering Journal, 2016, 290:319-327.
- [10]李壮,张杨,朱跃.燃煤机组烟气超低排放改造对细颗粒物的影响[J].电力科技与环保,2018, 34(1):27-31.LI Z, ZHANG Y, ZHU Y. The effect of fine particulate matter on the ultra-low flue gas emission transformation of coal-fired units[J].Electric Power Technology and Environmental Protection, 2018, 34(1):27-31.
- [11]柏文文,魏加华,倪三川,等.低频声波作用下微液滴沉降实验研究[J].应用基础与工程科学学报,2020, 28(2):247-258.BAI W W, WEI J H, NI S C,et al. Experimental study on micro-droplet sedimentation under the action of low-frequency acoustic wave[J].Journal of Basic Science and Engineering, 2020, 28(2):247-258.
- [12]高昕玥,范高峰,刘爱平,等.湿法脱硫后烟气和浆液余热回收技术研究进展[J].化工进展,2024, 43(8):4307-4319.GAO X Y, FAN G F, LIU A P,et al. Research progress on waste heat recovery technology for flue gas and slurry after wet desulphurization[J].Chemical Industry and Engineering Progress, 2024, 43(8):4307-4319.
- [13]朱浩,叶罗,周德,等.湿法脱硫吸收塔除雾器堵塞分析及预防[J].电力科技与环保,2018, 34(6):47-49.ZHU H, YE L, ZHOU D,et al. Analysis and preventive measures for the demister blockage of the wet desulfurization absorber[J].Electric Power Technology and Environmental Protection, 2018, 34(6):47-49.
- [14]马振方.声波团聚消除火灾烟雾的实验研究[D].杭州:中国计量大学,2020.MA Z F. Experimental study on eliminating fire smokes using acoustic agglomeration technology[D]. Hangzhou:China Jiliang University, 2020.
- [15] ZHANG M, HE F Y, LI C,et al. Experimental study on coalescence of fog droplets in cloud chamber under low-frequency sound waves[J].Journal of Physics D(Applied Physics), 2021, 54(39):395301.
- [16] CHANG C, WANG Z K, JI Z L. Experimental study on the removal of submicron droplets by fibrous filter media in a sound field[J].Powder Technology, 2023, 429:118902.
- [17] YANG Y, CAO Q F, WANG Y,et al. Agglomeration of oil droplets assisted by low-frequency sonic pretreatment[J].Powder Technology, 2023, 428:118860.
- [18] MANOUCHERI M, EZEKOYE O A. Polystyrene soot agglomeration enhancement in an ultrasonic acoustic field[J].Hazardous Waste and Hazardous Materials, 1996, 13(1):121-130.
- [19]何福优.低频声波促进液滴碰并的实验研究[D].武汉:华中科技大学,2022.HE F Y. Experimental investigation on low-frequency sound waves promoting the collision-coalescence of droplets[D]. Wuhan:Huazhong University of Science and Technology, 2022.
- [20] SHI Y, WEI J H, BAI W W,et al. Theoretical analysis of acoustic and turbulent agglomeration of droplet aerosols[J].Advanced Powder Technology, 2023, 34(10):104145.
- [21] HOFFMANN T L, KOOPMANN G H. A new technique for visualization of acoustic particle agglomeration[J].Review of Scientific Instruments, 1994, 65(5):1527-1536.
- [22] GONZáLEZ I, GALLEGO-JUáREZ J A, RIERA E. The influence of entrainment on acoustically induced interactions between aerosol particles—An experimental study[J].Journal of Aerosol Science, 2003, 34(12):1611-1631.
- [23] ZHANG G X, MA Z F, SHEN J,et al. Experimental study on eliminating fire smokes using acoustic agglomeration technology[J].Journal of Hazardous Materials, 2020, 382:121089.
- [24] ILINSKII Y A, LIPKENS B, LUCAS T S,et al. Nonlinear standing waves in an acoustical resonator[J].The Journal of the Acoustical Society of America, 1998, 104(5):2664-2674.