• Title/Summary/Keyword: godbert-greenwald furnace

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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;Mok, Yun-Soo
    • Journal of the Korean Society of Safety
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    • v.19 no.1
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    • pp.137-140
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    • 2004
  • 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%.

A Study on The Effect of Humidity and Temperature of Hydroxy Propyl Methyl Cellulose Dust (Hydroxy Propyl Methyl Cellulose 분진의 습도와 온도에 대한 영향성 연구)

  • Lim Woo-Sub;Mok Yun-Soo;Choi Jae-Wook
    • Journal of the Korean Society of Safety
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    • v.19 no.3 s.67
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    • pp.65-69
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    • 2004
  • This study was performed with Hartmann type dust explosion apparatus and Godbert-Greenwald furnace apparatus in order to research the effect of temperature and humidity affecting LEL, minimum ignition temperature of Hydroxy Propyl Methyl Cellulose. The experimental determinations in the range between $20^{\circ}C\;and\;60^{\circ}C$ of temperature was not affected $LEL(180g/m^3)$ but LEL showed $200g/m^3\;and\;250g/m^3\;at\;80^{|circ}C\;and\;100^{\circ}C$. As the change of humidity LEL was $180g/m^3\;for\;50\%,\;200g/m^3\;for\;60\%\;and\;250g/m^3\;for\;70\%$ but dust explosion didn't occur over $80\%$. The ignition temperature of HPMC dust clouds was increased as increasing of humidity. So, the minimum ignition temperatures at $50\%,\;60\%,\;70\%\;80\%$ of humidity was $363^{\circ}C,\;375^{\circ}C,\;397^{\circ}C,\;405^{\circ}C$.

A Study on Autoignition Characteristics of Methylmethacrylate-butadiene-styrene Copolymer (MBS 공중합물의 자연발화 특성에 관한 연구)

  • 목연수;최재욱
    • Journal of the Korean Society of Safety
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    • v.16 no.3
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    • pp.83-88
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    • 2001
  • This study was preformed by measuring the minimum ignition temperature of MBS according to the change of sample vessel size and the minimum ignition temperature of MBS dust cloud The minimum ignition temperature of MBS product decreased as the vessel size was large, and it was obtained in the range from $120.5^{\circ}C$ to $94.5^{\circ}C$ and the apparent activation energy was obtained with 32.94Kcal/mol. The minimum ignition temperature of MBS dust cloud was measured by using Godbert-Greenwald furnace and it was obtained at $407^{\circ}C$ with the sample of 0.4g in the air and the ignition of dust cloud was not occurred below 13% oxygen concentration.

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