单区式双涡旋型收尘极板电除尘器荷电粒子输运模型及仿真研究
|
摘要
为进一步探究单区式双涡旋型收尘极板电除尘器(ESP)内部荷电粒子的输运规律,丰富与完善该电除尘器的除尘机理,在其结构特点的基础上建立了数学模型并寻找合适的边界条件,采用MATLAB数学软件对模型方程进行了仿真求解,并将收尘效率实验的结果与仿真求解结果进行了对比。研究结果显示:所建立的单区式双涡旋型在极板电除尘器内部荷电粒子在流场、扩散场、力场作用下的二阶偏微分输运模型方程及该模型的边界条件能反映内部粒子的运行规律;MATLAB数学软件仿真求解模拟结果表明:一定的运行条件下,在0~14μm粒径范围内,随着粒径的不断增加,收尘效率也逐渐提高,当粉尘粒径从2μm增加到14μm时,粉尘的收尘效率从85.2%提高到94.8%。通过实验验证,实验结果与MATLAB仿真结果的趋势基本一致,证明了模拟结果的可靠性。研究结果表明单区式双涡旋型收尘极板电除尘器性能优良,有良好的发展前景。
In order to further explore the transporting principle of the charged particles inside the single-stage double-vortex collecting plate electrostatic precipitator(ESP), and to enrich the dust removal mechanism of this type of ESP, we established a mathematical model of its particles transporting under the force fields, the flow field, and the diffusion field as well as the corresponding boundary conditions on the basis of its structural characteristics; mathematical software MATLAB was used to solve the equation of the simulation transporting model; experiments on collection efficiency was performed to compare with the simulation results. The results show that the establishment of the internal charged particles transporting model can explain the transporting principle and the boundary conditions of the model were appropriate; mathematical simulation solved by the MATLAB software shows that, under certain operating conditions, within the 0~14 μm particle size range, dust removal efficiency gradually increases with increasing particle size. When the size of particles increases from 2 μm to 14 μm, the dust collection efficiency will increase from 85.2% to 94.8%. The experimental results are consistent with the trend of MATLAB simulation results, proving that the simulation is reliable. The results indicate that single-stage double-vortex collecting plate ESP has a super function on fine particles and thus has a profound application prospect.
In order to further explore the transporting principle of the charged particles inside the single-stage double-vortex collecting plate electrostatic precipitator(ESP), and to enrich the dust removal mechanism of this type of ESP, we established a mathematical model of its particles transporting under the force fields, the flow field, and the diffusion field as well as the corresponding boundary conditions on the basis of its structural characteristics; mathematical software MATLAB was used to solve the equation of the simulation transporting model; experiments on collection efficiency was performed to compare with the simulation results. The results show that the establishment of the internal charged particles transporting model can explain the transporting principle and the boundary conditions of the model were appropriate; mathematical simulation solved by the MATLAB software shows that, under certain operating conditions, within the 0~14 μm particle size range, dust removal efficiency gradually increases with increasing particle size. When the size of particles increases from 2 μm to 14 μm, the dust collection efficiency will increase from 85.2% to 94.8%. The experimental results are consistent with the trend of MATLAB simulation results, proving that the simulation is reliable. The results indicate that single-stage double-vortex collecting plate ESP has a super function on fine particles and thus has a profound application prospect.
引文
[1]陈仁杰,阚海东.雾霾污染与人体健康[J].自然杂志,2013,35(5):342-344.CHEN Renjie,KAN Haidong.Haze/fog and human health:a literature review[J].Chinese Journal of Nature,2013,35(5):342-344.
[2]胡志光,贾博强.中国电除尘器与袋式除尘器的现状比较与分析[J].环境科学与管理,2012,37(12):93-97.HU Zhiguang,JIA Boqiang.Current situation comparison and analysis on china's electrostatic precipitator and bag filter[J].Environmental Science&Management,2012,37(12):93-97.
[3]CHENG A,ANTHONY L.ESP research in Asia[J].English for Specific Purposes,2014,33(1):1-3.
[4]火电厂大气污染物排放标准:GB 13223—2011[S],2011.Emission standard of air pollutants for thermal power plants:GB13223—2011[S],2011.
[5]李奎中,莫建松.火电厂电除尘器应用现状及新技术探讨[J].环境工程技术学报,2013,3(3):231-239.LI Kuizhong,MO Jiansong.Electrostatic precipitator for power plants:present status and prospects of new technologies[J].Journal of Environmental Engineering Technology,2013,3(3):231-239.
[6]闫克平,李树然,冯卫强,等.高电压环境工程应用研究关键技术问题分析及展望[J].高电压技术,2015,41(8):2528-2544.YAN Keping,LI Shuran,FENG Weiqiang,et al.Analysis and prospect on key technology of high-voltage discharge for environmental engineering study and application[J].High Voltage Engineering,2015,41(8):2528-2544.
[7]俞佰均.静电除尘器电极技术研究进展[J].环境与可持续发展,2016,40(5):149-154.YU Baijun.Research progress of the electrode technology of electrostatic precipitator[J].Environment and Sustainable Development,2016,40(5):149-154.
[8]李庆,王利,杨青,等.板-袋收尘极板对微细粉尘收集效果的影响分析[J].高电压技术,2016,42(2):361-367.LI Qing,WANG Li,YANG Qing,et al.Analysis on the influence of board-bag collecting plate on the effect of the fine dust collection[J].High Voltage Engineering,2016,42(2):361-367.
[9]YI C W,MA S,ZHAO Y Q,et al.Study on ion concentration of new type transverse plate ESP[J].Applied Mechanics and Materials,2012(468/471):2381-2384.
[10]YI Chengwu,YIN Tian,HUANG Haiqing,et al.Study on new laboratory scale transverse plate electrostatic precipitator collecting fly ash[J].Applied Mechanics and Materials,2013(433/435):2260-2264.
[11]LIU H,ZHOU M Y,YI C W,et al.Study on the experiment of ion transport properties in single area double vortexes plate ESP[J].Applied Mechanics&Materials,2013(470):717-721.
[12]YI C W,WANG Y M,QU W M,et al.Numerical simulation for high gas velocity electrostatic precipitator with transverse collecting plates[C]//International Conference on Mechanic Automation and Control Engineering.Wuhan,China:IEEE,2010:2098-2101.
[13]唐敏康,李永兵.电除尘器内部粒子运动及分布数学模型仿真研究[J].电力科技与环保,2010,26(5):15-17.TANG Minkang,LI Yongbing.Building up and simulating the mathematical model of particles moving in ESP[J].Electric Power Technology&Environmental Protection,2010,26(5):15-17.
[14]BERRACHED D,TILMATINE A,MILOUA F,et al.Modeling of a two stages electrostatic air precipitation process using response surface modeling[J].Archives of Electrical Engineering,2014,63(4):609-619.
[15]ADAMIAK K.Numerical models in simulating wire-plate electrostatic precipitators:a review[J].Journal of Electrostatics,2013,71(4):673-680.
[16]GUO B Y,GUO J,YU A B.Simulation of the electric field in wire-plate type electrostatic precipitators[J].Journal of Electrostatics,2014,72(4):301-310.
[17]INTRA P,YAWOOTTI A,RATTANADECHO P.Numerical and experimental studies of collection efficiency of an ion electrostatic collector for a mini-volume electrical PM detector[J].Journal of Electrostatics,2014,72(6):477-486.
[18]AL-HAMOUZ Z.Numerical and experimental evaluation of fly ash collection efficiency in electrostatic precipitators[J].Energy Conversion&Management,2014,79(2):487-497.
[19]YI C W,WANG Y M,BAI X Y,et al.Application of CFD in the field of electrostatic dust removal[J].Machinery Design&Manufacture,2010(3):66-67.
[20]孙健,白敏冬,毛程奇,等.粉尘的电晕荷电物理模型[J].大连海事大学学报,2006,32(3):108-111.SUN Jian,BAI Mindong,MAO Chengqi,et al.Physical model of corona charged dust[J].Journal of Dalian Maritime University,2006,32(3):108-111.
[21]杨振兴.电除尘器的空间电气特性数值分析[D].武汉:武汉科技大学,2008.YANG Zhenxing.Analysis for space electric characteristics in ESPs[D].Wuhan,China:Wuhan University of Science and Technology,2008.
[22]董黎莹.稀土钨热电子发射式高温静电除尘器粉尘荷电特性的研究[D].南京:南京师范大学,2011.DONG Liying.Tungsten thermionic emission type of high temperature electrostatic precipitator dust charged characteristics research[D].Nanjing,China:Nanjing Normal University,2011.
[23]裴莹莹,郝文阁,赵光玲,等.ESP粉尘二维输运方程中紊流掺混系数及边界条件的确定[J].安全与环境学报,2008,8(1):141-144.PEI Yingying,HAO Wenge,ZHAO Guangling,et al.Defining the turbulent mixing coefficient and the corresponding flux-boundary conditions for the dust diffusion equation[J].Journal of Safety&Environment,2008,8(1):141-144.
[24]TANG C,TOH K C,PHOON K K.Axisymmetric lower-bound limit analysis using finite elements and second-order cone programming[J].Journal of Engineering Mechanics,2013,140(2):268-278.
[25]NOWAK,ANDRZEJ.Numerical verification and experimental validation of the FEM model of collecting electrodes in a dry electrostatic precipitator[J].Latin American Journal of Solids&Structures,2013,10(1):19-38.
[26]王忆锋,唐利斌.利用有限差分和MATLAB矩阵运算直接求解二维泊松方程[J].红外技术,2010,32(4):213-216.WANG Yifeng,TANG Libin.Direct solution of two-dimensional poisson equation with finite difference and matlab matrix computation[J].Infrared Technology,2010,32(4):213-216.
[27]LONG Z W,YAO Q,SONG Q,et al.A second-order accurate finite volume method for the computation of electrical conditions inside a wire-plate electrostatic precipitator on unstructured meshes[J].Journal of Electrostatics,2009,67(4):597-604.
[28]BERTOLAZZI E,MANZINI G.A second-order maximum principle preserving finite volume method for steady convection-diffusion problems[J].Siam Journal on Numerical Analysis,2005,43(5):2172-2199.
[29]ADAMIEC W,IWONA.Modelling of systems of collecting electrodes of electrostatic precipitators by means of the rigid finite element method[J].Archive of Mechanical Engineering,2011,58(1):27-47.
[30]翁杰.电除尘器除尘效率的影响因素分析[J].水泥技术,2013(3):102-104.WENG Jie.Analysis on influnce factor of ESP’s efficiency[J].Cement Technology,2013(3):102-104.
[31]LANCEREAU Q,ROUX J M,ACHARD J L.Influence of secondary flows on the collection efficiency of a cylindrical electrostatic precipitator[J].Journal of Aerosol Science,2013,63(2):146-160.
[32]WU X B,HU Y F,LI X C.Experimental study on mechanism and influencing factors of dedusting efficiency of self-excitation water curtain dust removal[J].Zhongzhou Coal,2011(2):13-15.
[33]尹连庆,王晶.粉尘比电阻对电除尘的影响及改进措施研究[J].电力科技与环保,2009,25(5):34-37.YIN Lianqing,WANG Jing.Study on the influences and improvement measures of dust resistivity to electrostatic precipitator(ESP)[J].Electric Power Environmental Protection,2009,25(5):34-37.
[34]崔海蓉,杨超珍,余盛兵,等.电极参数影响射流喷雾荷电量的试验研究[J].高电压技术,2015,41(12):4042-4047.CUI Hairong,YANG Chaozhen,YU Shengbing,et al.Experimental study of electrode parameters’effect on jet spray charge[J].High Voltage Engineering,2015,41(12):4042-4047.
[2]胡志光,贾博强.中国电除尘器与袋式除尘器的现状比较与分析[J].环境科学与管理,2012,37(12):93-97.HU Zhiguang,JIA Boqiang.Current situation comparison and analysis on china's electrostatic precipitator and bag filter[J].Environmental Science&Management,2012,37(12):93-97.
[3]CHENG A,ANTHONY L.ESP research in Asia[J].English for Specific Purposes,2014,33(1):1-3.
[4]火电厂大气污染物排放标准:GB 13223—2011[S],2011.Emission standard of air pollutants for thermal power plants:GB13223—2011[S],2011.
[5]李奎中,莫建松.火电厂电除尘器应用现状及新技术探讨[J].环境工程技术学报,2013,3(3):231-239.LI Kuizhong,MO Jiansong.Electrostatic precipitator for power plants:present status and prospects of new technologies[J].Journal of Environmental Engineering Technology,2013,3(3):231-239.
[6]闫克平,李树然,冯卫强,等.高电压环境工程应用研究关键技术问题分析及展望[J].高电压技术,2015,41(8):2528-2544.YAN Keping,LI Shuran,FENG Weiqiang,et al.Analysis and prospect on key technology of high-voltage discharge for environmental engineering study and application[J].High Voltage Engineering,2015,41(8):2528-2544.
[7]俞佰均.静电除尘器电极技术研究进展[J].环境与可持续发展,2016,40(5):149-154.YU Baijun.Research progress of the electrode technology of electrostatic precipitator[J].Environment and Sustainable Development,2016,40(5):149-154.
[8]李庆,王利,杨青,等.板-袋收尘极板对微细粉尘收集效果的影响分析[J].高电压技术,2016,42(2):361-367.LI Qing,WANG Li,YANG Qing,et al.Analysis on the influence of board-bag collecting plate on the effect of the fine dust collection[J].High Voltage Engineering,2016,42(2):361-367.
[9]YI C W,MA S,ZHAO Y Q,et al.Study on ion concentration of new type transverse plate ESP[J].Applied Mechanics and Materials,2012(468/471):2381-2384.
[10]YI Chengwu,YIN Tian,HUANG Haiqing,et al.Study on new laboratory scale transverse plate electrostatic precipitator collecting fly ash[J].Applied Mechanics and Materials,2013(433/435):2260-2264.
[11]LIU H,ZHOU M Y,YI C W,et al.Study on the experiment of ion transport properties in single area double vortexes plate ESP[J].Applied Mechanics&Materials,2013(470):717-721.
[12]YI C W,WANG Y M,QU W M,et al.Numerical simulation for high gas velocity electrostatic precipitator with transverse collecting plates[C]//International Conference on Mechanic Automation and Control Engineering.Wuhan,China:IEEE,2010:2098-2101.
[13]唐敏康,李永兵.电除尘器内部粒子运动及分布数学模型仿真研究[J].电力科技与环保,2010,26(5):15-17.TANG Minkang,LI Yongbing.Building up and simulating the mathematical model of particles moving in ESP[J].Electric Power Technology&Environmental Protection,2010,26(5):15-17.
[14]BERRACHED D,TILMATINE A,MILOUA F,et al.Modeling of a two stages electrostatic air precipitation process using response surface modeling[J].Archives of Electrical Engineering,2014,63(4):609-619.
[15]ADAMIAK K.Numerical models in simulating wire-plate electrostatic precipitators:a review[J].Journal of Electrostatics,2013,71(4):673-680.
[16]GUO B Y,GUO J,YU A B.Simulation of the electric field in wire-plate type electrostatic precipitators[J].Journal of Electrostatics,2014,72(4):301-310.
[17]INTRA P,YAWOOTTI A,RATTANADECHO P.Numerical and experimental studies of collection efficiency of an ion electrostatic collector for a mini-volume electrical PM detector[J].Journal of Electrostatics,2014,72(6):477-486.
[18]AL-HAMOUZ Z.Numerical and experimental evaluation of fly ash collection efficiency in electrostatic precipitators[J].Energy Conversion&Management,2014,79(2):487-497.
[19]YI C W,WANG Y M,BAI X Y,et al.Application of CFD in the field of electrostatic dust removal[J].Machinery Design&Manufacture,2010(3):66-67.
[20]孙健,白敏冬,毛程奇,等.粉尘的电晕荷电物理模型[J].大连海事大学学报,2006,32(3):108-111.SUN Jian,BAI Mindong,MAO Chengqi,et al.Physical model of corona charged dust[J].Journal of Dalian Maritime University,2006,32(3):108-111.
[21]杨振兴.电除尘器的空间电气特性数值分析[D].武汉:武汉科技大学,2008.YANG Zhenxing.Analysis for space electric characteristics in ESPs[D].Wuhan,China:Wuhan University of Science and Technology,2008.
[22]董黎莹.稀土钨热电子发射式高温静电除尘器粉尘荷电特性的研究[D].南京:南京师范大学,2011.DONG Liying.Tungsten thermionic emission type of high temperature electrostatic precipitator dust charged characteristics research[D].Nanjing,China:Nanjing Normal University,2011.
[23]裴莹莹,郝文阁,赵光玲,等.ESP粉尘二维输运方程中紊流掺混系数及边界条件的确定[J].安全与环境学报,2008,8(1):141-144.PEI Yingying,HAO Wenge,ZHAO Guangling,et al.Defining the turbulent mixing coefficient and the corresponding flux-boundary conditions for the dust diffusion equation[J].Journal of Safety&Environment,2008,8(1):141-144.
[24]TANG C,TOH K C,PHOON K K.Axisymmetric lower-bound limit analysis using finite elements and second-order cone programming[J].Journal of Engineering Mechanics,2013,140(2):268-278.
[25]NOWAK,ANDRZEJ.Numerical verification and experimental validation of the FEM model of collecting electrodes in a dry electrostatic precipitator[J].Latin American Journal of Solids&Structures,2013,10(1):19-38.
[26]王忆锋,唐利斌.利用有限差分和MATLAB矩阵运算直接求解二维泊松方程[J].红外技术,2010,32(4):213-216.WANG Yifeng,TANG Libin.Direct solution of two-dimensional poisson equation with finite difference and matlab matrix computation[J].Infrared Technology,2010,32(4):213-216.
[27]LONG Z W,YAO Q,SONG Q,et al.A second-order accurate finite volume method for the computation of electrical conditions inside a wire-plate electrostatic precipitator on unstructured meshes[J].Journal of Electrostatics,2009,67(4):597-604.
[28]BERTOLAZZI E,MANZINI G.A second-order maximum principle preserving finite volume method for steady convection-diffusion problems[J].Siam Journal on Numerical Analysis,2005,43(5):2172-2199.
[29]ADAMIEC W,IWONA.Modelling of systems of collecting electrodes of electrostatic precipitators by means of the rigid finite element method[J].Archive of Mechanical Engineering,2011,58(1):27-47.
[30]翁杰.电除尘器除尘效率的影响因素分析[J].水泥技术,2013(3):102-104.WENG Jie.Analysis on influnce factor of ESP’s efficiency[J].Cement Technology,2013(3):102-104.
[31]LANCEREAU Q,ROUX J M,ACHARD J L.Influence of secondary flows on the collection efficiency of a cylindrical electrostatic precipitator[J].Journal of Aerosol Science,2013,63(2):146-160.
[32]WU X B,HU Y F,LI X C.Experimental study on mechanism and influencing factors of dedusting efficiency of self-excitation water curtain dust removal[J].Zhongzhou Coal,2011(2):13-15.
[33]尹连庆,王晶.粉尘比电阻对电除尘的影响及改进措施研究[J].电力科技与环保,2009,25(5):34-37.YIN Lianqing,WANG Jing.Study on the influences and improvement measures of dust resistivity to electrostatic precipitator(ESP)[J].Electric Power Environmental Protection,2009,25(5):34-37.
[34]崔海蓉,杨超珍,余盛兵,等.电极参数影响射流喷雾荷电量的试验研究[J].高电压技术,2015,41(12):4042-4047.CUI Hairong,YANG Chaozhen,YU Shengbing,et al.Experimental study of electrode parameters’effect on jet spray charge[J].High Voltage Engineering,2015,41(12):4042-4047.