Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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High Resistivity Characteristics of the Sinter Dust Generated from the Steel Plant

  • Lee, Jae-Keun (School of Mechanical Engineering, Pusan National University) ;
  • Hyun, Ok-Chun (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Jung-Eun (School of Mechanical Engineering, Pusan National University) ;
  • Park, Sang-Deok (Mechanical & Electrical Engineering Team Steel Process & Automation Research Center, Research Institute of Industrial Science and Technology)
  • Published : 2001.05.01
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Abstract

The electrical resistivity of sinter dusts generated from the steel industry and coal fly ash from the coal power plant has been investigated using the high voltage conductivity cell based on JIS B 9915 as a function of temperature and water content. Dust characterization such as the chemical composition, size distribution, atomic concentration, and surface structure has been conducted. Major constituents of sinter dusts were Fe$_2$O$_3$(40∼74.5%), CaO (6.4∼8.2%), SiO$_2$(4.1∼6.0%), and unburned carbon (7.0∼14.7%), while the coal fly ash consisted of mainly SiO$_2$(51.4%), Al$_2$O$_3$(24.1%), and Fe$_2$O$_3$(10.5%). Size distributions of the sinter dusts were bi-modal in shape and the mass median diameters (MMD) were in the range of 24.7∼137㎛, whereas the coal fly ash also displayed bi-modal distribution and the MMD of the coal fly ash was 35.71㎛. Factors affecting resistivity of dusts were chemical composition, moisture content, particle size, gas temperature, and surface structure of dust. The resistivity of sinter dusts was so high as 10(sup)15 ohm$.$cm at 150$\^{C}$ that sinter dust would not precipitate well. The resistivity of the coal fly ash was measured 1012 ohm$.$cm at about 150$\^{C}$. Increased water contents of the ambient air lowered the dust resistivity because current conduction was more activated for absorption of water vapor on the surface layer of the dust.

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References

  1. Beachler, S.D. and Jahnke, J.A., 1981, APTI Course 4/3 Control of Particulate Emissions Student Manual
  2. Bickelhaupt, R.E., 1979, 'A Technique for Predicting Fly Ash Resistivity,' Interagency Energy / Environment R&D Program Report, U. S. EPA
  3. Bickelhaupt, R.E., 1974, 'Electrical Volume Conduction in Fly Ash,' Journal of the Air Pollution Control Association, 27(2);114-120
  4. Japanese Standards Association, 1989, 'Measuring Methods for Dust Resistivity (with Parallel Electrodes) JIS B 9915,' Japanese Industrial Standard
  5. Ku, Jae Hyun, Lee, Jung Eun, and Lee, Jae Keun, 2000, 'A Study of Fly Ash Resistivity Characteristics Generated from the Coal Fired Power Plant as a Function of Water Concentration and Temperature,' Transactions of the Korean Society of Mechanical Engineers, Vol. 24, No.4, pp. 526-532
  6. Masuda, S., 1979, 'Electrostatic Precipitation in Japanese Steel Industries,' Symposium on the Transfer and Utilization of Particulate Control Technology: Volume 11, pp. 309-318
  7. Sproull, W.T. and Nakada, Woshinao, 1951, 'Operation of Cottrell Precipitators, Effects of Moisture and Temperature,' Industrial and Engineering Chemistry, Vol. 43, No.6, pp. 1350-1358 https://doi.org/10.1021/ie50498a028
  8. Steelhammer, J.C., Nogash, D.R., and Polizzotti, D.M., 1977, 'Laboratory Electrostatic Precipitator Studies Relating to the Steel Industry,' Proceedings: Particulate Collection Problems Using ESP's in the Metallurgical Industry, pp. 54-71
  9. Walker, A.B., 1968, 'Operating Principles of Air Pollution Control Equipment,' Research Cottrell, Inc., Somerville, N.J.