Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Characteristics of Flames Propagating Through Combustible Particles Concentration in a Vertical Duct

수직 배관 내의 농도변화에 따른 분진폭발 특성

  • Han, Ou-Sup (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA)) ;
  • Han, In-Soo (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA)) ;
  • Choi, Yi-Rac (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA)) ;
  • Lee, Jung-Suk (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA)) ;
  • Lee, Su-Hee (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA))
  • 한우섭 (한국산업안전보건공단 산업안전보건연구원 화학물질안전보건센터) ;
  • 한인수 (한국산업안전보건공단 산업안전보건연구원 화학물질안전보건센터) ;
  • 최이락 (한국산업안전보건공단 산업안전보건연구원 화학물질안전보건센터) ;
  • 이정석 (한국산업안전보건공단 산업안전보건연구원 화학물질안전보건센터) ;
  • 이수희 (한국산업안전보건공단 산업안전보건연구원 화학물질안전보건센터)
  • Published : 2011.01.30
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Abstract

We investigated experimentally the properties of dust explosion through lycopodium particle clouds in a duct to provide the fundamental knowledge. Propagating dust flames in the vertical duct of 120 cm height and 12 cm square cross-section were observed by digital video camera and flame front is visualized using by PIV(Particle Image Velocimetry) system. As the result, when the same average dust concentration existed in the vertical duct, downward flame propagation was faster than the upward flame propagation, its rate increased with dust concentration in 300g/$m^3$. Post flames were caused by the ignition of unburned particles which flowed into the rear region of flame from passage between flame and duct wall, and they generated regardless of duct condition. Also, it was found that appearance frequency of post flames during dust flame propagations increased with the increase of dust concentration.

본 연구에서는 수직 배관 내에서 석송자 농도 변화에 따른 분진화염전파 특성을 상세히 조사하였다. 이를 위해 디지털비디오카메라와 PIV(Particle Image Velocimetry)를 사용하여 높이 120 cm, 단면 12 cm의 정방형 수직 덕트 내를 전파하는 분진화염의 입자거동을 해석하였다. 그 결과, 배관 내에 동일 평균농도의 분진운이 존재하는 경우 상방전파보다 하방 전파에 의한 화염전파속도가 크며 농도 약 300 g/$m^3$까지의 경우에는 분진농도가 증가할수록 그 비율이 증가하였다. 후방 화염(Post flame)은 배관 측벽과 화염면 사이를 통과하여 전파화염 후방에 유입된 미연소 입자의 발화에 의한 것으로 배관의 밀폐조건과 관계없이 발생하였다. 또한 후방 화염의 발생 빈도는 농도의 증가와 함께 증가하는 것을 알았다.

Keywords

References

  1. Eckhoff, R. K., Dust explosions in the Process Industries-3rd ed., Gulf Professional Publishing(2003).
  2. Van der, P. and Wel, Ignition and Propagation of Dust Explosions, Delft Univ. Press, Netherlands(1993).
  3. Mason, W. E. and Wilson, M. J. G., "Laminar Flames of Lycopodium Dust in Air," Combus. Flame, 11, 195-200(1967). https://doi.org/10.1016/0010-2180(67)90045-4
  4. Proust, C. and Veyssiere, B., "A New Experimental Apparatus for Studying the Propagation of Dust-Air Flames," AIAA Progress in Astronautics and Aeronautics Series(1987).
  5. Proust, C. and Veyssiere, B., Fundamental Properties of Flames Propagating in Starch Dust-air Mixtures, Combustion Science and Technology, 62, 149-172(1988). https://doi.org/10.1080/00102208808924007
  6. Veyssiere, B., Development and Propagation Regimes of Dust Explosions, Powder Technology, 71, 171-180(1992). https://doi.org/10.1016/0032-5910(92)80006-I
  7. Ulrich, K., Thomas, K. and Bela, G., Velocity and Concentration Effects on the Laminar Burning Velocity of Dust-air Mixture, Proc. 6th Int. Colloquium on Dust Explosion, Bergen, Norway, 5.1-5.14(1996).
  8. Han, O. S., Yashima, M., Matsuda, T., Matsui, H., Miyake, A. and Ogawa, T., Behavior of Flame Propagating Through Lycopodium Dust Clouds in a Vertical Duct, J. Loss Prev. in the Process Ind., 13(6), 449-457(2000). https://doi.org/10.1016/S0950-4230(99)00072-8
  9. Han, O. S., Flame Propagation Characteristics Through Suspended Combustibles Particle in a Full-scaled Duct, Korean Chem. Eng. Res.(HWAHAK KONGHAK), 47(5), 572-579(2009).
  10. Han, O. S., Han, I. S. and Choi, Y. R., Prediction of Flame Propagation Velocity Based on the Behavior of Dust Particles, Korean Chem. Eng. Res.(HWAHAK KONGHAK), 47(6), 705-709(2009).
  11. Kean, R. D. and Adrian, R. J., Theory of Cross-correlation Analysis of PIV Images in Flow Visualization and Image Analysis, ed. F. T. M. Nieuwstadt, 1-25(1993).
  12. Adrian, R. J., Particle-Imaging Technique for Experimental Fluid mechanics, Annual Review of Fluid Mechanics, 23, 261-304(1991). https://doi.org/10.1146/annurev.fl.23.010191.001401
  13. ASTM E1226-88, Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts(1988).
  14. Lewis, B. and Von Elbe, G., Combustion Flames and Explosions of Gases, 2nd Edition, Academic Press Inc., New York, 292-294(1961).

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