• Title/Summary/Keyword: 가스 폭발

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도시가스 - 공기혼합기체의 폭발특성에 관한 연구

  • 박승호;임우섭;목연수;최재욱
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2000.06a
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    • pp.136-139
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    • 2000
  • 현대산업사회의 급속한 발전으로 사용이 편리하고, 깨끗한 연료인 도시가스의 사용량은 점점 더 증대될 뿐만 아니라 사용형태 또한 다양화되고 있어, 이에 따른 사고도 증가하고 있으며 사고의 규모도 대형화 되어가고 있다. 일반적으로 가스폭발의 경우 개방된 영역에서 보다 밀폐된 영역에서 발생할 경우 폭발압력에 의한 파괴효과는 더욱 증가한다. 이러한 부분에 대해 많은 학자들은 단일가스와 산화제를 혼합시킨 형태의 가스 폭발에 대한 특성을 연구하여 왔다. 그러나 산소농도의 변화에 따른 가연성가스의 폭발범위, 폭발시 초기압력의 변화, 최소점화에너지에 관한 연구는 거의 없는 실정이다. (중략)

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A Review of TNT Equivalent Method for Evaluating Explosion Energy due to Gas Explosion (가스폭발에 따른 폭발에너지를 평가하기 위한 TNT 등가량 환산방법에 대한 고찰)

  • Kwon, Sangki;Park, Jung-Chan
    • Explosives and Blasting
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    • v.33 no.3
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    • pp.1-13
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    • 2015
  • Accidents related to gas explosion are frequently happened in foreign countries and in Korea. For the evaluation and the analysis of gas explosions, TNT equivalent methods are used. In this study, the influence of the selection of chemical equation in TNT explosion and the selection of enthalpy of the products on the explosion energy, detonation pressure, velocity of detonation, and temperature was calculated. Depending on the chemical equations, the maximum detonation pressure can be 2 times higher than the minimum. As an example for applying TNT equivalent method, an explosion of methane gas in a confined volume was assumed. With the TNT equivalent, it was possible to predict the variation of peak overpressure and impulse with the distance from the explosion location.

Effect of Non-uniform Concentration on Gas Explosion (불균일 농도가 가스 폭발에 미치는 영향)

  • Kim Sang Sub;Jang Gi Hyun
    • Journal of the Korean Institute of Gas
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    • v.7 no.4 s.21
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    • pp.14-19
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    • 2003
  • Generally the accident by gas explosion in the working place is occurred at the condition of non-uniform mixture rather than uniform one. This study could predict the explosion phenomenon of non-uniform mixture with model explosion chamber which realize various practical conditions As a result, the mixing level of gas in the chamber depends on discharge area and velocity when there is gas discharge in certain space. In addition, as non-uniform increases, explosion pressure and its increasing rate decrease. However, firing risk after the explosion flame by infrared heat increase due to the increase of residence time of flame.

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저항회로의 개폐불꽃에 의한 폭발성 가스의 점화한계에 관한 연구

  • 김재욱;이춘하
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 1997.11a
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    • pp.129-134
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    • 1997
  • 가스폭발사고를 방지하기 위하여 사용하는 방폭형 전기기기중에서 본질안전 방폭구조는 폭발위험장소에 설치되는 전기기기 및 배선의 어떤 부분에서 정상동작 및 사고시(단락, 지락, 단선 등)에 발생하는 불꽃, 아크, 과열이 주위에 있는 폭발성 가스에 점화되지 않도록 한 구조로서, 회로의 전압과 전류를 폭발성 가스의 점화한계 이하가 되도록 구성하는 원리이며 국내외에서 사용이 증가추세에 있다. (중략)

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A Study on the Explosion Characteristics of by Product Gas of Carbon Black Manufacturing Process (카본블랙 제조 부생가스의 폭발 특성연구)

  • Oh Kyu-Hyung;Lee Sung-Eun
    • Journal of the Korean Institute of Gas
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    • v.10 no.3 s.32
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    • pp.60-64
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    • 2006
  • Explosion range and explosion characteristics of by product gas from carbon black manufacturing process were studied. About 75% of the by product gas were composed with water vapour and nitrogen. And the combustible component in the gas were hydrogen, methane, acetylene and carbon mono-oxide. Because of the combustible components in the by product gas there are explosion hazards in the gas handling process. Explosion range of the gas by experiment was from 17.1% to 70.7% and the value has considerable difference with the calculated value from Lechatelier law. Explosion pressure of the gas was $5.4kg/cm^2$ and the average explosion pressure rise rate was $39.2kg/cm^2/s$. Based on the experimental result we can expect that a explosion or fire accident during the handling the gas can make a severe loss, therefore there should be a explosion prevention or protection measures in the gas handling process.

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Estimate Minimum Amount of Methane for Explosion in a Confined Space (밀폐공간에서 메탄 폭발사고의 최소 가스누출량 예측)

  • Jo, Young-Do
    • Journal of the Korean Institute of Gas
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    • v.21 no.4
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    • pp.1-5
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    • 2017
  • Leaking of natural gas, which is mostly methane, in a confined living space creates flammable atmosphere and gives rise to explosion accident. The minimum amount of leaked methane for explosion is highly dependent on the degree of mixing in the confined space. This paper proposes a method for estimating minimum amount of flammable gas for explosion by using Gaussian distribution explosion model(GDEM) and experimental explosion data. The explosion pressure in the confined space can be estimated by assuming the Gaussian distribution of flammable gas along the height of an enclosure and estimating the maximum amount of gas within flammable limits, combustion of the estimated gas with constant volume and adiabatic or isothermal mixing in the confined space. The predicted minimum gas amount for an explosion is tied to explosion pressure that results in a given building damage level. The result shows that very small amount of methane leaking in the confined space may results in a serious gas explosion accident. This result could be applied not only to setting the leak criteria for developing a gas safety appliance but also to accident investigating of explosion.

Calculation of the TNT Equivalent Mass of the Possible Explosion of CO, CH4, and C2H4 (CO와 CH4, C2H4 혼합 가스 폭발에 대한 TNT 등가량 계산)

  • Kim, Minju;Kwon, Sangki
    • Explosives and Blasting
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    • v.38 no.1
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    • pp.1-13
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    • 2020
  • Gas explosion accidents are steadily being issued due to increased gas consumption in Korea and foreign countries. To analyze the effects of these gas explosions, a TNT equivalent method is used. In this study, the TNT equivalent was calculated in the event of an explosion due to the volume content in the air of CO, CH4 and C2H4, the typical flammable gases emitted by coal. Also, the peak overpressure and impulse variation with the distance from explosion point were compared and analyzed by gas using the calculated equivalent value of TNT. The upper limit of the TNT equivalent for the three mixed gases is up to five times larger than the other gases mixture. In addition, the peak overpressure and impulse, which are factors of the TNT characteristic curve, are also increasing as the number of gases increases.

가연성 가스의 누출에 따른 확산현상 연구

  • 오규형;이성은;김종복
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2000.06a
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    • pp.180-185
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    • 2000
  • 연료로 사용하는 가연성 가스의 양이 증가함에 따라 가스 사고 건수도 증가하고 있으며 가스사고 중 약 35% 정도가 가스의 누설사고였다. 이러한 가스의 누설사고는 일정시간 경과 후 적절하게 배출되지 못할 경우 화재나 폭발사고로 이어질 위험성이 매우 크다. 즉 가스의 누출은 폭발이나 연소의 3요소 중에서 가연물이 제공되는 과정으로 가스폭발사고나 화재를 예방하기 위해서는 근본적으로 가스의 누출을 방지해야 한다. (중략)

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A study on the Prediction of Explosion Risk for the Low Pressure Natural Gas Facilities with Different Explosion Conditions (저압 도시가스 사용설비의 누출 조건에 따른 폭발 위험 분위기 형성 범위 예측에 관한 연구)

  • Han, Sangil;Lee, Dongwook;Hwang, Kyu-Suk
    • Journal of the Korean Institute of Gas
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    • v.20 no.3
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    • pp.59-65
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    • 2016
  • It is imperative to use suitable explosion proof equipments to prevent explosion in different gas facilities. There is no technical standard for the classification of hazardous areas though standard of explosion proof is regulated. In this study, we have adopted Industrial Standard KS to develop the methodology for the prediction of the explosion risk in the natural gas facility with low pressure using the important factors including hole size, hypothetical volume, validation of ventilation effectiveness. The applicability of the developed methodology was evaluated by the comparison with the data obtained from experiments of natural gas explosion.

A Study on Physicochemical Characteristics of Hydrogen Gas Explosion (수소가스 폭발의 물리화학적 특성 연구)

  • Jo, Young-Do
    • Journal of the Korean Institute of Gas
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    • v.16 no.1
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    • pp.8-14
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    • 2012
  • Hydrogen is considered to be the most important future energy carrier in many applications reducing significantly greenhouse gas emissions, but the explosion safety issues associated with hydrogen applications need to be investigated and fully understood to be applicable as the carrier. The risk associated with a explosion depends on an understanding of the impacts of the explosion, particularly the pressure-time history during the explosion. This work provides the effects of explosion parameters, such as specific heat ratio of burned and unburned gas, equilibrium maximum explosion pressure, and burning velocity, on the pressure-time history with flame growth model. The pressure-time history is dominantly depending on the burning velocity and equilibrium maximum explosion pressure of hydrogen-air mixture. The pressure rise rate increase with the burning velocity and equilibrium maximum explosion pressure. The specific heat ratio of unburned gas has more effect on the final explosion pressure increase rate than initial explosion pressure increase rate. However, the specific heat ratio of burned gas has more influence on initial explosion pressure increase rate. The flame speeds are obtained by fitting the experimental data sets. The flame speeds for hydrogen in air based on our experimental data is very low, making a transition from deflagration to detonation in a confined space unlikely under these conditions.