Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지
DOI QR코드

DOI QR Code

Design and Evaluation of a High Concentration, High Penetration Unipolar Corona Ionizer for Electrostatic Discharge and Aerosol Charging

  • Intra, Panich (Research Unit of Electrostatic Applications in Energy and Environment, College of Integrated Science and Technology, Rajamangala University of Technology Lanna) ;
  • Tippayawong, Nakorn (Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University)
  • Received : 2012.11.05
  • Accepted : 2013.04.19
  • Published : 2013.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The aim of this paper is to design and evaluate a high concentration, high penetration unipolar corona ionizer. The electrostatic characteristics in terms of voltage-current relationships of the present ionizer in the discharge zones for positive and negative coronas were discussed. Using ion current measurement, the concentration and penetration of ions were evaluated at corona voltages across the needle electrodes between 1 and 4 kV, flow rates between 1 and 5 L/min, and an operating pressure of 1 atm. In the discharge zone of the ionizer, the highest ion concentrations were found to be about $1.71{\times}10^{14}$ and $5.09{\times}10^{14}\;ions/m^3$ for positive and negative coronas, respectively. At the outlet of the ionizer, it was found that the highest ion concentration was about $1.95{\times}10^{13}$ and $1.91{\times}10^{13}\;ions/m^3$ for positive and negative coronas, respectively. The highest ion penetration for positive and negative coronas through the ionizer was found to be about 98 % and 33 %, respectively. The $N_it$ product for positive and negative coronas was also found to $1.28{\times}10^{13}$ and $7.43{\times}10^{13}\;ions/m^3s$, respectively. From the findings, this ionizer proved to be particularly useful as an aerosol charger for positive and negative charge before the detector in an electrical aerosol detector.

Keywords

References

  1. P. Intra and N. Tippayawong, "An overview of unipolar charger developments for nanoparticle charging," Journal of Aerosol and Air Quality Research, Vol. 11, No. 2, pp. 186 - 208, 2011.
  2. W. C. Hinds, Aerosol Technology, John Wiley & Sons, New York, U.S.A, 1999.
  3. P. Intra and N. Tippayawong, "Performance evaluation of an electrometer system for ion and aerosol charge measurements," Korean Journal of Chemical Engineering, Vol. 28, No. 2, pp. 527-530, 2011. https://doi.org/10.1007/s11814-010-0378-1
  4. G. W. Hewitt, "The charging of small particles for electrostatic precipitation," AIEE Transactions, Vol. 76, pp. 300-306, 1957.
  5. Whitby, K. T., "Generator for producing high concentration of small ions," Review of Scientific Instruments, Vol. 32, No. 12, 1351-1355, 1961. https://doi.org/10.1063/1.1717250
  6. H. J. White, Industrial Electrostatic Precipitation, Addison-Wesley, Reading, Massachusetts, 1963.
  7. B. Y. H. Liu, K. T. Whitby and H. H. S. Yu, "Diffusion charging of aerosol particles at low pressures," Journal of Applied Physics, Vol. 38, No. 4, pp. 1592-1597, 1967. https://doi.org/10.1063/1.1709728
  8. B. Y. H. Liu and D. Y. H. Pui, "On the performance of the electrical aerosol analyzer," Journal of Aerosol Science, Vol. 6, pp. 249-264, 1975. https://doi.org/10.1016/0021-8502(75)90093-2
  9. D. Y. H. Pui, Experimental study of diffusion charging of aerosols, Ph.D. thesis, University of Minnesota, Minneapolis, MN, USA, 1976.
  10. A. Hernandez-Sierra, F. J. Alguacil, and M. Alonso, "Unipolar charging of nanometer aerosol particle in a corona ionizer," Journal of Aerosol Science, Vol. 34, pp. 733-745, 2003. https://doi.org/10.1016/S0021-8502(03)00033-8
  11. M. Alonso, M. I. Martin, and F. J. Alguacil, "The measurement of charging efficiencies and losses of aerosol nanoparticles in a corona charger," Journal of Electrostatics, Vol. 64, pp. 203-214, 2006. https://doi.org/10.1016/j.elstat.2005.05.008
  12. P. Intra and N. Tippayawong, "Effect of needle cone angle and air flow rate on electrostatic discharge characteristics of a corona-needle ionizer," Journal of Electrostatics, Vol. 68, No. 3, pp. 254-260, 2010. https://doi.org/10.1016/j.elstat.2010.01.008
  13. P. Intra, A. Yawootti, U. Vinitketkumnuen and N. Tippayawong, "Investigation of electrical discharge characteristics of a unipolar corona-wire aerosol charger," Journal of Electrical Engineering and Technology, Vol. 6, No. 4, pp. 556-562, 2011. https://doi.org/10.5370/JEET.2011.6.4.556
  14. P. Intra and N. Tippayawong, "Progress in unipolar corona discharger designs for airborne particle charging: A literature review," Journal of Electrostatics, Vol. 67, No.4, pp. 605-615, 2009. https://doi.org/10.1016/j.elstat.2008.12.018
  15. P. Intra and N. Tippayawong, "Comparative study on electrical discharge and operation characteristics of needle and wire-cylinder corona chargers," Journal of Electrical Engineering and Technology, Vol. 1, No. 4, pp. 520-527, 2006. https://doi.org/10.5370/JEET.2006.1.4.520
  16. G.P. Reischl, J. M. Makela, R. Harch, and J. Necid, "Bipolar charging of ultrafine particles in the size range below 10 nm," Journal of Aerosol Science, Vol. 27, pp. 931-949, 1996. https://doi.org/10.1016/0021-8502(96)00026-2

Cited by

  1. An experimental study of relative humidity and air flow effects on positive and negative corona discharges in a corona-needle charger vol.77, 2015, https://doi.org/10.1016/j.elstat.2015.07.011
  2. Design and development of an Electrostatic Screen Battery for Emission Control (ESBEC) vol.107, 2017, https://doi.org/10.1016/j.jaerosci.2017.02.008
  3. Influence of the corona-wire diameter and length on corona discharge characteristics of a cylindrical tri-axial charger vol.74, 2015, https://doi.org/10.1016/j.elstat.2014.12.002
  4. Comparison of electrostatic charge and beta attenuation mass monitors for continuous airborne PM10 monitoring under field conditions vol.33, pp.12, 2016, https://doi.org/10.1007/s11814-016-0288-y
  5. Two-stage electrostatic precipitator with co- and counter-flow particle prechargers vol.87, 2017, https://doi.org/10.1016/j.elstat.2017.04.012
  6. Numerical and experimental studies of collection efficiency of an ion electrostatic collector for a mini-volume electrical PM detector vol.72, pp.6, 2014, https://doi.org/10.1016/j.elstat.2014.09.001
  7. An Experimental Investigation of A Non-Mixing Type Corona-Needle Charger for Submicron Aerosol Particles vol.14, pp.1, 2019, https://doi.org/10.1007/s42835-018-00011-x