A Study on The Spontaneous Ignition of a Hydroxy Propyl Methyl Cellulose Dust Cloud

Hydroxy Propyl Methyl Cellulose 분진의 운상자연발화에 관한 연구

  • Lim, Woo-Sub (Department of Safety Engineering, Graduate school, Pukyong National University) ;
  • Mok, Yun-Soo (Department of Safety Engineering, Pukyong National University)
  • 임우섭 (부경대학교 안전공학과 대학원) ;
  • 목연수 (부경대학교 안전공학과)
  • Published : 2004.03.01

Abstract

The minimum ignition temperature at which the dust cloud can spontaneously ignite is considered to be very important in industries to prevent explosion occurring in hot surfaces. This paper has dealt with the experimental study of the determination of minimum ignition temperature of Hydroxy Propyl Methyl Cellulose (HPMC) dust cloud. We have used the Godbert-Greenwald Furnace Apparatus to determine the ignition temperature and limiting oxyten concentration for dust could. The experimental determinations on the minimum ignition temperature were carried out with various particle size with nominal diameters 45, 75 and 106${\mu}m$. The limiting oxygen concentration of dust cloud was determinated for the smaller size(45${\mu}m$) HPMC. Minimum ignition temperature of dust cloud was at 364$^{\circ}C$ for the concentration of 2.5g/L in the air and became higher with the increasing of nitrogen concentration. It was also found that the ignition didn't occur when the oxygen concentration was below 10%, and limiting oxygen concentration is at 11%.

최근 산업현장에서는 제품의 품질과 성능을 향상시키기 위해 나노 기술로 나아가는 추세에 있으며, 이러한 연구들로 인해 많은 화학제품의 원료들이 더욱 미세한 상태로 가공 및 취급되어지고 있다. 이에 분진의 특성상 그 위험성이 따라 증가하고 있으므로, 분진폭발의 발생을 예방하기 위해 분진운의 발화온도와 폭발한계산소농도 등을 찾아내는 것은 매우 중요한 일이다. 따라서 본 연구에서는 현재 국내에서 생산되고 있는 Hydroxy Propyl Methyl Cellulose (HPMC)을 가지고 실험을 하였으며, 생산 및 취급과정에서 뜨거운 표면으로부터 발생될 수 있는 화재 및 폭발을 예방하고자, Godbert-Greenwald Furnace장치로 실험하였다. 그 결과 분진 입자의 크기가 작아짐으로서 발화온도는 낮아지는 경향을 나타내었으며, 분진입자의 크기가 45${\mu}m$에서 HPMC 분진운의 최소발화온도는 364$^{\circ}C$로 나타났으며, 폭발한계산소 농도는 11%로 나타났다.

Keywords

References

  1. P. Field, 'Dust Explosion', Elsevier Sci. Pub., Amsterdam, 1982
  2. Richard E. Cocks, 'Dust Explosion: Prevention and control', Chemical engineering, pp. 94, 1979
  3. Waylcrnd C. Griffith, 'Dust Explosion' Ann. Rev. Fluid Mech, 1978
  4. Manju Mittal, B.K. Guha, 'Study of Ignition Temperature of a Polyethylene Dust Cloud', Fire and materials, Vol. 20, pp. 97-105, 1996 https://doi.org/10.1002/(SICI)1099-1018(199603)20:2<97::AID-FAM568>3.0.CO;2-L
  5. Y.S. Mok, J. S. Kim, S.H. Park, 'A Study on the Ignition Energy of MBS Dust Explosion', Proceeding of the 1st Conference of the Association of Korean-Japanese Safety Engineering Society, pp. 172-175, 1999
  6. Norbert Jaeger, Richard Siwek, 'Prevent Explosion of Combustible Dust', Chem. Eng. Prog., Vol. 3, pp. 25-37, 1999