Performance of single fiber collection PM<sub>2.5</sub> under different magnetic field forms in the iron and steel industry

ZHANG Li-an; DIAO Yong-fa; ZHUANG Jia-wei; ZHOU Fa-shan; SHEN Heng-gen

doi:10.13374/j.issn2095-9389.2019.02.24.004

Volume 42 Issue 2

Feb. 2020

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Article Navigation > Chinese Journal of Engineering > 2020 > 42(2): 154-162

ZHANG Li-an, DIAO Yong-fa, ZHUANG Jia-wei, ZHOU Fa-shan, SHEN Heng-gen. Performance of single fiber collection PM2.5 under different magnetic field forms in the iron and steel industry[J]. Chinese Journal of Engineering, 2020, 42(2): 154-162. doi: 10.13374/j.issn2095-9389.2019.02.24.004

Citation:

ZHANG Li-an, DIAO Yong-fa, ZHUANG Jia-wei, ZHOU Fa-shan, SHEN Heng-gen. Performance of single fiber collection PM_2.5 under different magnetic field forms in the iron and steel industry[J]. Chinese Journal of Engineering, 2020, 42(2): 154-162. doi: 10.13374/j.issn2095-9389.2019.02.24.004

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Performance of single fiber collection PM_2.5 under different magnetic field forms in the iron and steel industry

doi: 10.13374/j.issn2095-9389.2019.02.24.004

School of Environmental Science and Engineering College, Dong Hua University, Shanghai 201620, China

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Corresponding author: E-mail: diaoyongfa@dhu.edu.cn
Received Date: 2019-02-24
Publish Date: 2020-02-01

Abstract

Abstract

At present, the steel industry has become the focus of air pollution prevention and control. To solve the difficulty in collecting PM_2.5 fine particles and achieving ultra-low emission of dust, based on the method of computational fluid dynamics-discrete phase model (CFD-DPM), the influence of different magnetic field forms, such as magnetic field generated by magnetic fiber and high-gradient magnetic field, on the performance of PM_2.5 collection in the iron and steel industry was studied. Through X-ray diffraction (XRD) analysis, it was found out that the dust produced in the iron and steel industry production process has magnetic characteristics due to the presence of Fe₃O₄ and elemental Fe, furthermore, the method of using magnetic field to enhance the PM_2.5 collection performance of single fiber was proposed. The results show that the magnetic field generated by the magnetic fiber will form a gravitational region around the fiber, and the high-gradient magnetic field will form two gravitational regions and two repulsive regions around the fiber. In terms of the collection ability, when particle diameter d_p between 0.5 and 1.0 μm, inlet velocity v≤0.2 m·s^?1, the collection ability of magnetic fiber under the high-gradient magnetic field is stronger than that of the single magnetic fiber. If magnetic field intensity H=0.5 T, magnetic induction intensity B=0.01 T, and v=0.1 m·s^?1, the high-gradient magnetic field can improve the single fiber collection efficiency by 28.32 times as much as the original; if B=0.01 T, v=0.1 ms^?1, the magnetic field generated by the magnetic fiber can improve the single fiber collection efficiency by 4.037 times as much as the original. In terms of the collection law, in the magnetic field generated by the magnetic fiber, when the magnetic flux density B≥0.03 T, the collection efficiency of magnetic single fiber on PM_2.5 decreases with the increase of inlet velocity speed and then tends to be stable. When B<0.03 T, the collection efficiency decreases with the inlet velocity speed. The collection efficiency increases with the increase of dust particle size. For the high-gradient magnetic field, the single fiber collection efficiency of PM_2.5 particles also decreases with the increase of inlet velocity speed. When v>0.4 ms^?1, the collection efficiency is 0. The larger B is, the faster the collection efficiency decreases. The collection efficiency increases first and then decreases with a increase in dust particle size.
- magnetic fiber,
- high-gradient magnetic field,
- PM_2.5,
- ferromagnetism,
- collection performance

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References(23)

References

[1]	張雅. 鋼鐵產業生態化設計與政策選擇. 中國人口?資源與環境, 2012, 22(7):162 Zhang Y. Eco-design of steel industry and policy options in China. China's Popul Resour Environ, 2012, 22(7): 162
[2]	熊桂龍, 李水清, 陳晟, 等. 增強PM_2.5脫除的新型電除塵技術的發展. 中國電機工程學報, 2015, 35(9):2217 Xiong G L, Li S Q, Chen S, et al. Development of advanced electrostatic precipitation technologies for reducing PM_2.5 emissions from coal-fired power plants. Proc CSEE, 2015, 35(9): 2217
[3]	曲悅, 錢旭, 宋洪慶, 等. 基于機器學習的北京市PM2.5濃度預測模型及模擬分析. 工程科學學報, 2019, 41(3):401 Qu Y, Qian X, Song H Q, et al. Machine-learning-based model and simulation analysis of PM2.5 concentration prediction in Beijing. Chin J Eng, 2019, 41(3): 401
[4]	顧從匯, 呂士武, 李瑞, 等. 纖維對PM_2.5過濾性能的影響. 化工學報, 2014, 65(6):2137 doi: 10.3969/j.issn.0438-1157.2014.06.026 Gu C H, Lü S W, Li R, et al. Influence of fiber on filtration performance for PM_2.5. CIESC J, 2014, 65(6): 2137 doi: 10.3969/j.issn.0438-1157.2014.06.026
[5]	Bao L, Musadiq M, Kijima T, et al. Influence of fibers on the dust dislodgement efficiency of bag filters. Text Res J, 2014, 84(7): 764 doi: 10.1177/0040517513509853
[6]	Yang M M, Li S Q, Yao Q. Mechanistic studies of initial deposition of fine adhesive particles on a fiber using discrete-element methods. Powder Technol, 2013, 248: 44 doi: 10.1016/j.powtec.2012.12.016
[7]	Hosseini S A, Tafreshi H V. Modeling particle-loaded single fiber efficiency and fiber drag using ANSYS-Fluent CFD code. Comput Fluids, 2012, 66: 157 doi: 10.1016/j.compfluid.2012.06.017
[8]	Huang S, Zhang X M, Tafu M, et al. Study on subway particle capture by ferromagnetic mesh filter in nonuniform magnetic field. Sep Purif Technol, 2015, 156: 642 doi: 10.1016/j.seppur.2015.10.060
[9]	Ke C H, Shu S, Zhang H, et al. LBM-IBM-DEM modelling of magnetic particles in a fluid. Powder Technol, 2016, 314: 264
[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. Powder Technol, 2018, 327: 255 doi: 10.1016/j.powtec.2017.12.083
[11]	Baik S K, Ha D W, Kwon J M, et al. Magnetic force on a magnetic particle within a high gradient magnetic separator. Physica C, 2013, 484: 333 doi: 10.1016/j.physc.2012.03.033
[12]	Zheng X Y, Wang Y H, Lu D F. Investigation of the particle capture of elliptic cross-sectional matrix for high gradient magnetic separation. Powder Technol, 2016, 297: 303 doi: 10.1016/j.powtec.2016.04.032
[13]	Qian F P, Huang N J, Zhu X J, et al. Numerical study of the gas-solid flow characteristic of fibrous media based on SEM using CFD-DEM. Powder Technol, 2013, 249: 63 doi: 10.1016/j.powtec.2013.07.030
[14]	朱紅鈞. Fluent12流體分析及工程仿真. 北京: 清華大學出版社, 2011 Zhu H J. Fluid Analysis and Engineering Simulation of Fluent 12. Beijing: Tsinghua University Press, 2011
[15]	Tripathy S K, Bhoja S K, Kumar C R, et al. A short review on hydraulic classification and its development in mineral industry. Powder Technol, 2015, 270: 205 doi: 10.1016/j.powtec.2014.09.049
[16]	Eisentr?ger A, Vella D, Griffiths I M. Particle capture efficiency in a multi-wire model for high gradient magnetic separation. Appl Phys Lett, 2014, 105(3): 033508 doi: 10.1063/1.4890965
[17]	趙洪亮, 付海明, 雷陳磊, 等. 纖維截面形狀對纖維捕集效率及壓力損失的影響. 東華大學學報: 自然科學版, 2016, 42(1):86 Zhao H L, Fu H M, Lei C L, et al. Effect of fiber’s cross-sectional shape on fiber collection efficiency and pressure drop. J Donghua Univ Nat Sci, 2016, 42(1): 86
[18]	王發輝, 鐵占續. 高梯度磁場中單根磁介質捕集磁性微粒的數值模擬. 選煤技術, 2012(2):20 doi: 10.3969/j.issn.1001-3571.2012.02.006 Wang F H, Tie Z X. Numerical simulation for high gradient magnetic field located single magnetic medium in entrapping magnetism particles. Coal Prepar Technol, 2012(2): 20 doi: 10.3969/j.issn.1001-3571.2012.02.006
[19]	楊榮清. 高梯度磁場中磁性可吸入顆粒物動力學特性研究[學位論文]. 南京: 東南大學, 2006 Yang R Q. Investigation on Kinetic Characteristic of Magnetic Fine Particles in High Gradient Magnetic Field [Dissertation]. Nanjing: Southeast University, 2006
[20]	熊大和. 脈動高梯度磁選垂直磁場與水平磁場對比研究. 金屬礦山, 2004(10):24 doi: 10.3321/j.issn:1001-1250.2004.10.008 Xiong D H. Study on comparison between vertical and horizontal magnetic fields in pulsating high gradient magnetic separation. Metal Mine, 2004(10): 24 doi: 10.3321/j.issn:1001-1250.2004.10.008
[21]	孫仲元. 磁選理論. 長沙: 中南大學出版社, 2007 Sun Z Y. Magnetic Separation Theory. Changsha: Central South University Press, 2007
[22]	錢付平, 王海剛. 隨機排列纖維過濾器顆粒捕集特性的數值研究. 土木建筑與環境工程, 2010, 32(6):120 Qian F P, Wang H G. Numerical analysis on particle capture characteristics of fibrous filters with random structure. J Civil Architect Environ Eng, 2010, 32(6): 120
[23]	朱輝, 付海明, 亢燕銘. 單纖維過濾阻力與慣性捕集效率數值分析. 中國環境科學, 2017, 37(4):1298 doi: 10.3969/j.issn.1000-6923.2017.04.013 Zhu H, Fu H M, Kang Y M. Numerical analysis of pressure drop and inertial collection efficiency of a single fiber. China Environ Sci, 2017, 37(4): 1298 doi: 10.3969/j.issn.1000-6923.2017.04.013