基于电荷感应法浮游金属粉尘质量浓度检测技术
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摘要
抛光打磨作业场所浮游金属粉尘具有爆炸性,实现对其质量浓度实时监测具有重要意义。本文在分析了浮游金属粉尘带电机理和电荷感应法粉尘质量浓度检测原理的基础上,针对棒状和环状探测电极存在的问题,设计了一种螺旋环状探测电极。通过建立螺旋环状探测电极的空间灵敏度,证明了螺旋环状探测电极感应信号强度高,并为螺旋环状探测电极的匝数、半径、绝缘层厚度等具体参数的设计提供了参考依据;此外对通过螺旋环状探测电极的结构设计分析,证明了螺旋环状探测电极与外界具有较高的绝缘性,确认螺旋环状探测电极是基于电荷感应法理想的探测电极。最后实验证明:采用螺旋环状探测电极的电荷感应法浮游金属粉尘质量浓度传感器检测误差低于10%,具有较高的检测精度。
The floating metal dust in the polishing workplace is explosive and the real-time monitoring of its mass concentration is of great significance to prevent the occurrence of accidents. Based on the analysis of the electrification mechanism of floating metal dust and the detection principle of dust mass concentration by charge induction method, a spiral ring detection electrode was designed to solve the problems existing in the rod and ring detection electrodes. By establishing the spatial sensitivity of the helical annular probe electrode and carrying out correlation analysis, it is proved that the helical annular probe electrode has high inductance signal strength, which provides a reference for the design of its parameters such as the number of turns, radius, thickness of the insulating layer, etc. In addition, it is proved that the helical annular probe electrode has a high insulation with the outside world by analyzing its structure, finding that it is the ideal probe electrode based on charge sensing method. Finally, the experiments prove that the detection error is less than 10% by using the floating metal dust mass concentration sensor of charge sensing method with the helical annular probe electrode and it has a higher detection accuracy.
The floating metal dust in the polishing workplace is explosive and the real-time monitoring of its mass concentration is of great significance to prevent the occurrence of accidents. Based on the analysis of the electrification mechanism of floating metal dust and the detection principle of dust mass concentration by charge induction method, a spiral ring detection electrode was designed to solve the problems existing in the rod and ring detection electrodes. By establishing the spatial sensitivity of the helical annular probe electrode and carrying out correlation analysis, it is proved that the helical annular probe electrode has high inductance signal strength, which provides a reference for the design of its parameters such as the number of turns, radius, thickness of the insulating layer, etc. In addition, it is proved that the helical annular probe electrode has a high insulation with the outside world by analyzing its structure, finding that it is the ideal probe electrode based on charge sensing method. Finally, the experiments prove that the detection error is less than 10% by using the floating metal dust mass concentration sensor of charge sensing method with the helical annular probe electrode and it has a higher detection accuracy.
引文
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[12]戚淑芬,王国栋.基于电荷感应原理的粉尘含量在线检测仪设计[J].青岛科技大学学报(自然科学版),2011(5):526-530.
[13]许传龙,汤光华,杨道业,等.静电感应空间滤波法测量固体颗粒速度[J].中国电机工程学报,2007(26):84-89.
[14]张朴,孔力,刘文中,等.气固两相流静电传感器特性的研究[J].华中科技大学学报(自然科学版),2004(2):32-34.
[15]MA J,YAN Y.Design and evaluation of electrostatic sensors for the measurement of velocity of pneumatically conveyed solids[J].Flow Measurement and Instrumentation,2000,11(3):195-204.
[16]周宾,杨道业,许传龙,等.静电粉体流量计的理论与实验研究[J].仪器仪表学报,2009(9):2007-2012.
[17]许传龙.气固两相流颗粒荷电及流动参数检测方法研究[D].南京:东南大学,2006.
[18]KRABICKA J,YONG Y.Finite-element modeling of electrostatic sensors for the flow measurement of particles in pneumatic pipelines[J].IEEE Transactions on Instrumentation & Measurement,2009,58(8):2730-2736.
[19]GAJEWSKI J B.Dynamic effect of charged particles on the measuring probe potential[J].Journal of Electrostatics,1997,40:437-442.
[2]孙金华,卢平,刘义.空气中悬浮金属微粒子的燃烧特性[J].南京理工大学学报(自然科学版),2005(5):82-85.
[3]付羽,陈宝智,李刚.镁粉爆炸机理及其防护技术研究[J].工业安全与环保,2008,34(8):1-3.
[4]王智超,吴占松,杨英霞,等.粉尘质量浓度测试方法的实验研究[J].清华大学学报(自然科学版),2013(3):366-370.
[5]田贻丽,谢利利,徐如瑜.粉尘浓度测量的研究[J].重庆大学学报(自然科学版),2003(6):30-31.
[6]ZHANG J.Air-solids flow measurement using electrostatic techniques[M].Croatia:InTech – Open Access Publisher,2012:61-80.
[7]陈建阁,吴付祥,王杰.电荷感应法粉尘浓度检测技术[J].煤炭学报,2015(3):713-718.
[8]赵恩彪,李德文,王自亮,等.电荷法测量粉尘密度的试验研究[J].采矿与安全工程学报,2010(2):269-272.
[9]ADARAMODU A A,OSUNTOGUN A O,EHI-EROMOSELE C O.Heavy metal concentration of surface dust present in e-waste components:the westminister electronic market,lagos case study[J].Resources and Environment,2012,2(2):9-13.
[10]陈建阁,王杰,吴付祥.交流耦合式电荷感应法粉尘浓度检测技术研究[J].环境工程,2014(4):131-134.
[11]陈建阁.交流耦合式电荷感应法粉尘浓度检测技术研究[D].北京:煤炭科学研究总院,2014.
[12]戚淑芬,王国栋.基于电荷感应原理的粉尘含量在线检测仪设计[J].青岛科技大学学报(自然科学版),2011(5):526-530.
[13]许传龙,汤光华,杨道业,等.静电感应空间滤波法测量固体颗粒速度[J].中国电机工程学报,2007(26):84-89.
[14]张朴,孔力,刘文中,等.气固两相流静电传感器特性的研究[J].华中科技大学学报(自然科学版),2004(2):32-34.
[15]MA J,YAN Y.Design and evaluation of electrostatic sensors for the measurement of velocity of pneumatically conveyed solids[J].Flow Measurement and Instrumentation,2000,11(3):195-204.
[16]周宾,杨道业,许传龙,等.静电粉体流量计的理论与实验研究[J].仪器仪表学报,2009(9):2007-2012.
[17]许传龙.气固两相流颗粒荷电及流动参数检测方法研究[D].南京:东南大学,2006.
[18]KRABICKA J,YONG Y.Finite-element modeling of electrostatic sensors for the flow measurement of particles in pneumatic pipelines[J].IEEE Transactions on Instrumentation & Measurement,2009,58(8):2730-2736.
[19]GAJEWSKI J B.Dynamic effect of charged particles on the measuring probe potential[J].Journal of Electrostatics,1997,40:437-442.
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