• Title/Summary/Keyword: Hartman's dust explosion apparatus

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Explosion Characteristics of Bituminous Coal Dusts in Cement Manufacturing Process (시멘트 제조공정에서 유연탄 분진의 폭발특성)

  • Kim, Won-Hwai;Lee, Seung-Chul;Seung, Sam-Sun;Kim, Jin-Nam
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.2
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    • pp.257-263
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    • 2008
  • We have examined explosion characteristics of bituminous coal dusts in cement manufacturing process. In order to find the thermal properties, we investigated weight loss and ignition temperature of coal materials using TGA and DSC. Also specific surface area of dust was investigated. Dust explosion experiments with Hartman's dust explosion apparatus have been conducted by varying concentration and size of coal dust for explosion probability and lower limit explosion concentration. According to the results for thermal properties, there is a little change by dust size. However, the specific surface area of dust is increased by decreasing dust size. The explosion test results show that small size and increasing concentration of dusts make dust explosion easier. And we find that the lower limit explosion concentration of bituminous coal is $0.3mg/cm^3$ and the probability is 100% on $0.9mg/cm^3$ in 170/200 mesh used in cement manufacturing process.

Explosion Riskiness with Flying of Carbon Black Dust by Hartman (Hartman식 장치에 의한 Carbon Black 분진의 부유중 폭발 위험성 평가)

  • 현성호;김정환;이창우
    • Fire Science and Engineering
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    • v.12 no.4
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    • pp.13-19
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    • 1998
  • We investigated the weight loss according to temperature using Thermal Gravimetric Analysis(TGA) in order to find the thermal hazard of carbon black(Hi-Black 10, Hi-Black 50L) dusts, and the properties of dust explosion in variation of the surface functional groups and specific surface area of their dust with the same particle size. Using Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after making dust disperse by compressed air, dust explosion experiments have been conducted by varying concentration and size of carbon black dust. The explosion pressure of both carbon black increased as the specific surface area increased. The results indicated that Hi-Block 50L of which specific surface area was larger three to four times than that of Hi-Black 10 was much easier of dust explosion.

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A Study on the Explosion Riskiness with Flying of Activated Carbon (활성탄의 부유중 폭발 위험성에 관한 연구)

  • 김정환;현성호;이창우;함영민
    • Fire Science and Engineering
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    • v.12 no.3
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    • pp.3-9
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    • 1998
  • We investigated the weight loss according to temperature using TGA in order to find the thermal hazard of brand-new activated-carbon and disused activated-carbon dusts, and the properties of dust explosion in variation of the specific surface area of their dust with the same particle size. Using hartman's dust explosion apparatus which estimate dust explosion by electric ignition after making dust disperse by compressed air, dust explosion experiments have been conducted by varying concentration and size of activated carbon dust. The explosion pressure of both activated carbon increased as the specipic surface area increased. The results indicated that brand-new activated-carbon of which specific surface area was larger three to four times than that of disused activated-carbon was much easier of dust explosion.

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Study on Combustion and Explosion Hazard of Rice Bran Dusts (쌀겨 분진의 연소 및 폭발 위험성에 관한 연구)

  • 이창우;현성호;이한철;허윤행
    • Journal of environmental and Sanitary engineering
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    • v.14 no.4
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    • pp.93-98
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    • 1999
  • We had investigated combustion properties of rice bran dusts. Decomposition of rice bran dusts with temperature were investigated using DSC and the weight loss according to temperature using TGA in order to find the thermal hazard of rice bran dusts, and the properties of dust explosion in variation of their dust with the same particle size. Using Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after making dust disperse by compressed air, dust explosion experiments have been conducted by varying concentration and size of rice bran dust.According to the results for thermodynamic stability of rice bran dust, there are little change of initiation temperature of heat generation and heating value for used particle size. But initiation temperature of heat generation decreased with high heating rate whereas decomposition heat increased with particle size. Average maximum explosion pressure was $10kgf/cm^2$ for 60/70 mesh and $1.5mg/cm^2$ dust concentration.

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Study on Explosion Behavior of Air-born Rice Bran Dusts according to Ignition Energy (점화에너지 변화에 따른 쌀겨분진의 폭발 거동에 관한 연구)

  • 김정환;김현우;현성호;백동현
    • Fire Science and Engineering
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    • v.13 no.2
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    • pp.26-32
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    • 1999
  • We had investigated combustion pro야$\pi$ies of rice bran dusts. Decomposition of rice bran d dusts with temperature were investigated using DSC and the weight loss according to t temperature using TGA in order to find the thermal hazard of rice bran dusts, and the p properties of dust explosion in variation of their dust with the same particle size. Using H Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after m making dust disperse by compressed air, dust explosion experiments have been conducted by v varying concen$\sigma$ation and size of rice br뻐 dust. According to the results for thermodynamic stability of rice bran dust, there are little change of initiation temperature of heat generation 때d heating value for used particle size. But i initiation temperature of heat generation decreased with high heating rate whereas d decomposition heat increased with particle size. Also, the explosion pressure was increased as t the ignition energy increased and average maximum explosion pressure was 13.5 kgv'cnt for 5 BJ/60 mesh and 1.5 뼈Ie미 dust concentration.

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