三电极和双电极ESP中磁场效应的对比分析
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摘要
为探明磁控技术在不同静电除尘器中对除尘性能的贡献程度,建立了以磁场作用下的ESP理论模型用户自定义函数模拟了2种ESP在不同烟气流速下的除尘效率,并对比分析了2种ESP中的磁场效应。结果表明:2种ESP中的磁场效应均随颗粒粒径的减小而不断增强,且三电极ESP中的分级除尘效率随之下降的趋势更明显;磁场有效地提升了2种ESP的除尘效率,提升幅度在高烟气流速下、双电极ESP中更大;随着磁感应强度的增大,2种ESP中的除尘性能均得到不断的提高,烟气流速的上升对除尘效率的削弱作用不断减小,这2种趋势在双电极ESP中表现得更显著。
To ascertain the contribution of magnetic control technology to the dust removal performance in different electrostatic precipitators( ESPs),based on the theoretical model of ESPs in a magnetic field,in this paper,we present a calculation process,simulate the collection efficiency of two kinds of ESPs at different gas velocities in a magnetic field environment with a combination of user-defined functions,and compare and analyze the magnetic field effect in two kinds of ESPs. The results show that magnetic field effects in two kinds of ESPs both increase with the a decrease in the particle diameter,and the downward trend of grade efficiency in three-electrode ESP is more obvious. The magnetic field can effectively enhance the collection efficiencies in these two kinds of ESPs,and the enhanced magnitude is greater at high gas velocity or in double-electrode ESP. Furthermore,with increases in the magnetic induction density,the dust removal performances in the two kinds of ESPs are greatly improved,the weakening effect associated with increasing gas velocity on the collection efficiency constantly decreases,and these two trends are more significant in the double-electrode ESP.
To ascertain the contribution of magnetic control technology to the dust removal performance in different electrostatic precipitators( ESPs),based on the theoretical model of ESPs in a magnetic field,in this paper,we present a calculation process,simulate the collection efficiency of two kinds of ESPs at different gas velocities in a magnetic field environment with a combination of user-defined functions,and compare and analyze the magnetic field effect in two kinds of ESPs. The results show that magnetic field effects in two kinds of ESPs both increase with the a decrease in the particle diameter,and the downward trend of grade efficiency in three-electrode ESP is more obvious. The magnetic field can effectively enhance the collection efficiencies in these two kinds of ESPs,and the enhanced magnitude is greater at high gas velocity or in double-electrode ESP. Furthermore,with increases in the magnetic induction density,the dust removal performances in the two kinds of ESPs are greatly improved,the weakening effect associated with increasing gas velocity on the collection efficiency constantly decreases,and these two trends are more significant in the double-electrode ESP.
引文
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[19]李庆.基于激光测量技术的煤尘污染静电治理研究[D].保定:河北大学,2008.LI Qing. Study on electrostatic treatment of coal dust pollution based on laser measurement[D]. Baoding:Hebei University,2008.
[20]PENNEY G W,MATICK R E. Potentials in D-C corona fields[J]. Transactions of the American institute of electrical engineers, part I:communication and electronics,1960,79(2):91-99.
[21]陈举师,蒋仲安,谭聪.岩巷综掘工作面通风除尘系统的数值模拟[J].哈尔滨工业大学学报,2015,47(2):98-103.CHEN Jushi, JIANG Zhongan, TAN Cong. Numerical simulation of dust removal and ventilation system in the rock comprehensive tunneling face[J]. Journal of Harbin Institute of Technology,2015,47(2):98-103.
[22]郝文阁,裴莹莹,侯亚平,等. ESP电场粉尘非稳态收集过程数值仿真[J].东北大学学报(自然科学版),2008,29(8):1179-1182.HAO Wenge,PEI Yingying,HOU Yaping,et al. Numerical simulation of non-steady dust collection process in electric field of electrostatic precipitator[J]. Journal of Northeastern University(nature science),2008,29(8):1179-1182.
[2]HU Bin,ZHANG Lin,YI Yang,et al. PM2. 5and SO3collaborative removal in electrostatic precipitator[J]. Powder technology,2017,318:484-490.
[3]亢燕铭,党小庆,张晓玲.三电极电除尘器的电流特性[J].中原工学院学报,2003,14(S1):46-48,51.KANG Yanming,DANG Xiaoqing,ZHANG Xiaoling. Current characteristics in tri-electrode electrostatic precipitators[J]. Journal of Zhongyuan Institute of Technology,2003,14(S1):46-48,51.
[4]熊桂龙,李水清,陈晟,等.增强PM2. 5脱除的新型电除尘技术的发展[J].中国电机工程学报,2015,35(9):2217-2223.XIONG Guilong,LI Shuiqing,CHEN Sheng,et al. Development of advanced electrostatic precipitation technologies for reducing PM2. 5emissions from coal-fired power plants[J]. Proceedings of the CSEE,2015,35(9):2217-2223.
[5]原乃武,杨武,娄建勇,等.引入磁场的预荷电集尘空气净化效率的研究[J].西安交通大学学报,2001,35(8):785-789.YUAN Naiwu,YANG Wu,LOU Jianyong,et al. Research on the efficiency of air purification by collecting pre-charged suspend particles with the magnetic field[J]. Journal of Xi'an Jiaotong University,2001,35(8):785-789.
[6]林山杉,盛连喜,李明非,等.磁增强电晕放电及其对颗粒荷电的研究[J].电工技术学报,2004,19(9):42-45,56.LIN Shanshan,SHENG Lianxi,LI Mingfei,et al. Corona discharge of magnet enhancement and its effect on charging behavior of particles[J]. Transactions of China electrotechnical society,2004,19(9):42-45,56.
[7]XU Dexuan,SHENG Lianxi,WANG Haijun,et al. Study of magnetically enhanced corona pre-charger[J]. Journal of electrostatics,2007,65(2):101-106.
[8]胡毅飞.洛仑兹力在除尘设备中应用之设想[J].新世纪水泥导报,1999,5(6):33-34.HU Yifei. Imagination of applying Lorentz Force to dedusting equipments[J]. Cement guide for new epoch,1999,5(6):33-34.
[9]朱世文.磁控电除尘技术的研究与应用[C]//第十一届全国电除尘学术会议论文集.郑州,2005:116-123.ZHU Shiwen. Research and application of magnetic control ESP[C]//Proceeding of the 11th Conference of ESP.Zhengzhou,2005:116-123.
[10]ZHANG Jianping,ZHANG Xing,SHI Fengfeng,et al.Diffusion charging effects on PM10collection efficiency in A wire-pipe ESP under multi-field coupling[J]. Environmental engineering and management journal,2016,15(11):2367-2374.
[11]ZHANG Jianping,XU Dacheng,REN Jianxing,et al.Modeling and simulation of PM2. 5collection efficiency in a wire-plate ESP subjected to magnetic field and diffusion charging[J]. Environmental progress&sustainable energy,2015,34(3):697-702.
[12]SVOBODA J. Magnetic flocculation and treatment of fine weakly magnetic minerals[J]. IEEE transactions on magnetics,1982,18(2):796-801.
[13]TSOURIS C,SCOTT T C. Flocculation of paramagnetic particles in a magnetic field[J]. Journal of colloid and interface science,1995,171(2):319-330.
[14]YING T Y,YIACOUMI S,TSOURIS C. High-gradient magnetically seeded filtration[J]. Chemical engineering science,2000,55(6):1101-1113.
[15]ZIMMER A T,BARON P A,BISWAS P. The influence of operating parameters on number-weighted aerosol size distribution generated from a gas metal arc welding process[J]. Journal of aerosol science,2002,33(3):519-531.
[16]DOMINIK C,NUBOLD H. Magnetic aggregation:dynamics and numerical modeling[J]. Icarus,2002,157(1):173-186.
[17]KUMAR P,BISWAS P. Analytical expressions of the collision frequency function for aggregation of magnetic particles[J]. Journal of aerosol science,2005,36(4):455-469.
[18]LU Quanyang,YANG Zhengda,ZHENG Chenghang,et al. Numerical simulation on the fine particle charging and transport behaviors in a wire-plate electrostatic precipitator[J]. Advanced powder technology,2016,27(5):1905-1911.
[19]李庆.基于激光测量技术的煤尘污染静电治理研究[D].保定:河北大学,2008.LI Qing. Study on electrostatic treatment of coal dust pollution based on laser measurement[D]. Baoding:Hebei University,2008.
[20]PENNEY G W,MATICK R E. Potentials in D-C corona fields[J]. Transactions of the American institute of electrical engineers, part I:communication and electronics,1960,79(2):91-99.
[21]陈举师,蒋仲安,谭聪.岩巷综掘工作面通风除尘系统的数值模拟[J].哈尔滨工业大学学报,2015,47(2):98-103.CHEN Jushi, JIANG Zhongan, TAN Cong. Numerical simulation of dust removal and ventilation system in the rock comprehensive tunneling face[J]. Journal of Harbin Institute of Technology,2015,47(2):98-103.
[22]郝文阁,裴莹莹,侯亚平,等. ESP电场粉尘非稳态收集过程数值仿真[J].东北大学学报(自然科学版),2008,29(8):1179-1182.HAO Wenge,PEI Yingying,HOU Yaping,et al. Numerical simulation of non-steady dust collection process in electric field of electrostatic precipitator[J]. Journal of Northeastern University(nature science),2008,29(8):1179-1182.