Abstract：In order to achieve ultra-low emission of Fe based fine particles in the production process of ferrous metallurgy and casting industry, this study proposed a method to improve sub-particle capturing by electret magnetic fibers. Based on CFD-DPM (Discrete Phase Model), the influence of charge distribution on fibers, particle pre-charge electric field intensity, fiber magnetic flux density and particle magnetic susceptibility on electret magnetic fiber capturing property was investigated. The results showed that:around the electret magnetic fiber, the magnetic force was more significantly affected by the distance than did the Coulomb force. The effect of magnetic force was limited within an extremely short distance around the fiber, and there was a linear relationship between the capturing efficiency and charge distribution on fibers and pre-charge electric field intensity. As for 0.5μm particle, the growth rate at which fiber carrying capacity and pre-charge electric field intensity increased the capturing efficiency was lower than that of 2.5μm article. When the particle size was between 0.5 and 1.0μm, enhancing the magnetic flux intensity of electret magnetic fiber and improving particle magnetic susceptibility were less effective in improving the capturing efficiency. When the particle size was between 1.5 and 2.5μm, enhancing the magnetic flux intensity of electret magnetic fiber and improving particle magnetic susceptibility could significantly improve the fiber capturing efficiency.
Prashant R, Saifi I, Tarun G. Deposition modeling of ambient aerosols in human respiratory system:Health implication of fine particles penetration into pulmonary region[J]. Atmospheric Pollution Research, 2019,10(1):334-343.
[2]
刘佳媛,高健,张岳翀,等.北京APEC期间不同颗粒物源解析方法的结果比较[J]. 中国环境科学, 2020,40(3):938-947. Liu J Y, Gao J, Zhang Y C, et al. Results comparison of different source apportionment methods during APEC summit in Beijing[J]. China Environmental Science, 2020,40(3):938-947.
[3]
Guo Y Y, Gao X, Zhu T Y. Chemical profiles of PM emitted from the iron and steel industry in northern China[J]. Atmospheric Environment, 2017,150:187-197.
[4]
Hleis D, Fernández-Olmo I, Ledoux F, et al. Chemical profile identification of fugitive and confined particle emissions from an integrated iron and steelmaking plant[J]. Journal of Hazardous Materials, 2013,250:246-255.
[5]
张蕾,姬亚芹,李越洋,等.钢铁冶炼尘两种采样方法PM2.5中元素的比较研究[J]. 中国环境科学, 2018,38(12):4426-4431. Zhang L, Ji Y Q, Li Y Y, et al. A comparative study on the elements of PM2.5 in two sampling methods of steel dust[J]. China Environmental Science, 2018,38(12):4426-4431.
[6]
郑玫,张延君,闫才青,等.上海PM2.5工业源谱的建立[J]. 中国环境科学, 2013,33(8):1354-1359. Zheng M, Zhang Y J, Yan C Q, et al. Establishing PM2.5 industrial source profiles in Shanghai[J]. China Environmental Science, 2013,33(8):1354-1359.
[7]
靳孟洁,张轶舜,赵金帅,等.郑州市氧化铝工业炉窑污染物及源谱特征[J]. 中国环境科学, 2020,40(3):1023-1029. Jin M J, Zhang Y S, Zhao J S, et al. Characterization of particulate matter Source profiles and pollutant from alumina industrial furnace[J]. China Environmental Science, 2020,40(3):1023-1029.
[8]
Meneses V A, PereiraGomes J F, Scotti A. The effect of metal transfer stability (spattering) on fume generation, morphology and composition in short-circuit MAG welding[J]. Journal of Materials Processing Technology, 2014,217(7):1388-1397.
[9]
Huang H, Zheng C, Zhao H. Numerical investigation on non-steady-state filtration of elliptical fibers for submicron particles in the "Greenfield gap'' range[J]. Journal of Aerosol Science, 2017,114:263-275.
[10]
Li Y W, Zhao C S, Wu X, et al. Aggregation experiments on fine fly ash particles in uniform magnetic field[J]. Powder Technology, 2007,174(3):93-103.
[11]
Zhao C S, Li Y W, Wu X, et al. Experimental investigation on aggregation of coal-fired PM10 by magnetic seeding[J]. Chemical Engineering Journal, 2007,133(13):301-309.
[12]
鲁端峰,赵长遂,吴新,等.高梯度磁场中燃煤PM10的捕集试验[J]. 东南大学学报(自然科学版), 2007,1:89-93. Lu D F, Zhao C S, Wu X, et al. Experimental research on capture of PM10 emitted from coal combustion with high gradient magnetic field[J]. Journal of Southeast University (Natural Science Edition), 2007, 1:89-93.
[13]
Huang S, Zhang X M, Masamoto T, et al. Study on subway particle capture by ferromagnetic mesh filter in nonuniform magnetic field[J]. Separation and Purification Technology, 2015,156:642-654.
[14]
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.
[15]
Zhou F S, Diao Y F, Wang R G, et al. Experimental study on PM2.5 removal by magnetic polyimide loaded with cobalt ferrate[J]. Energy and Built Environment, 2020,1(4):404-409.
[16]
Kerner M, Schmidt K, Schumacher S, et al. Evaluation of electrostatic properties of electret filters for aerosol deposition[J]. Separation and Purification Technology, 2020,239(15):116548.
[17]
Das D, Waychal A. On the triboelectrically charged nonwoven electrets for air filtration[J]. Journal of Electrostatics, 2016,83:73-77.
[18]
Wang N, Cai M, Yang X, et al. Electret nanofibrous membrane with enhanced filtration performance and wearing comfortability for face mask[J]. Journal of Colloid and Interface Science, 2018,530(15):695-703.
[19]
张俪安,刁永发,庄加玮,等.高梯度磁场提升单纤维捕集PM2.5性能的机理[J]. 中国环境科学, 2019,39(7):2765-2773. Zhang L A, Diao Y F, Zhuang J W, et al. The mechanism of high gradient magnetic field improving the performance of single fiber capture PM2.5[J]. China Environmental Science, 2019,39(7):2765-2773.
[20]
张俪安,刁永发,庄加玮,等.钢铁行业磁性纤维捕集非球形粉尘动力学研究[J]. 中国环境科学, 2020,40(4):1477-1485. Zhang L A, Diao Y F, Zhuang J W, et al. Study on the dynamic of non-spherical particles captured by magnetic fibers in steel industry[J]. China Environmental Science, 2020,40(4):1477-1485.
[21]
杨荆泉,田涛.驻极体过滤材料及其在空气净化领域的应用[J]. 环境与健康杂志, 2009,26(8):743-745. Yang J Q, Tian T. Application of electret filtration material in air purification[J]. Journal of Environment and Health, 2009,26(8):743-745.
[22]
Xie B, Li Y X, Li S H, et al. Performance of composite polyester filter with magnetic NdFeB particles on filtering welding fume particles[J]. Powder Technology, 2020,368(14):245-252.
[23]
Shi S Y, Xu C H, Wang X Q, et al. Electrospinning fabrication of flexible Fe3O4 fibers by sol-gel method with high saturation magnetization for heavy metal adsorption[J]. Materials & Design, 2020,186(15):108298.
[24]
唐敏.驻极体过滤材料对PM2.5过滤性能的研究[D]. 广州:华南理工大学, 2016. Tang M. Study on filtration performance of electret filter material for PM2.5[D]. Guangzhou:South China University of Technology, 2016.
[25]
Tian E Z, Mo J H, Li X F. Electrostatically assisted metal foam coarse filter with small pressure drop for efficient removal of fine particles:Effect of filter medium[J]. Building and Environment, 2016,144:419-426.
[26]
Feng Z B, Long Z W, Mo J H. Experimental and theoretical study of a novel electrostatic enhanced air filter (EEAF) for fine particles[J]. Journal of Aerosol Science, 2016,102:41-54.
[27]
Wang Y X, Lin Z P, Zhang W Y. Comparison of effects of particle charging, media characteristics, humidity and aerosols on loading performance of electret media[J]. Building and Environment, 2020, 179.
[28]
陈庆,高锋.一种磁性驻极纤维空气净化过滤材料及制备方法:中国, 201811357647.4[P]. 2019-02-12. Chen Q, Gao F. A magnetic electret fiber air purification filter material and its preparation method[P]. 2019-02-12.
[29]
刘功智,邓云峰,荣伟东,等.双极不对称预荷电静电增强过滤除尘技术的应用[J]. 中国安全科学学报, 2001,6:75-78. Liu G Z, Deng Y F, Rong W D, et al. Application of bipolar asymmetric pre charged electrostatic enhanced filtration and dust removal technology[J]. Chinese Journal of Safety Science, 2001,6:75-78.
[30]
Jaworek A, Sobczyk A T, Krupa A, et al. Hybrid electrostatic filtration systems for fly ash particles emission control. A review[J]. Separation and Purification Technology, 2019,213(15):283-302.
[31]
Penney G W. Using electrostatic forces to reduce pressure drop in fabric filters[J]. Powder Technology, 1977,18(1):111-116.
[32]
朱辉,付海明,亢燕铭.单纤维过滤介质表面尘粒捕集的随机模拟[J]. 环境工程学报, 2010,4(8):1881-1886. Zhu H, Fu H M, Kang Y M, et al. Stochastic simulation of dust collection on the surface of single fiber filter media[J]. Chinese Journal of Environmental Engineering, 2010,4(8):1881-1886.
[33]
Li W, Shen S N, Li H. Study and optimization of the filtration performance of multi-fiber filter[J]. Advanced Powder Technology, 2016,27(2):638-645.
[34]
陈懋章.粘性流体力学基础[M]. 北京:高等教育出版社, 2004. Chen M Z. Fundamentals of viscous fluid dynamics[M]. Beijing:Higher Education Press, 2004.
[35]
向晓东.气溶胶科学技术基础[M]. 北京:中国环境科学出版社, 2012. Xiang X D. Fundamentals of aerosol science and technology[M]. Beijing:China Environmental Science Press, 2012.
[36]
杨荣清.高梯度磁场中磁性可吸入颗粒物动力学特性探究[D]. 南京:东南大学, 2006. Yang R Q. Dynamic characteristics of magnetic inhalable particles in high gradient magnetic field[D]. Nanjing:Southeast University, 2006.
