• Title, Summary, Keyword: flammable limit

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A Study on the Explosion Limit and Explosion Characteristics of Flammable Vapor (가연성증기의 폭발한계 및 폭발특성에 관한 연구)

  • 김영수;이민세;신창섭
    • Journal of the Korean Society of Safety
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    • v.13 no.2
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    • pp.116-121
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    • 1998
  • Various flammable vapors as energy source and raw material have been stored, transported in the industries, and accidental leakage of these vapors occurs occasionally. Without an appropriate protection system, flammable vapors can be ignited and serious damage results from them. To reduce the risk caused by explosion, we should know the explosion limit and explosion characteristics. In this study, the maximum explosion pressure, the maximum explosion pressure rise, the effect of temperature and mixing with other vapor were measured in a cylindrical vessel. Experimental results showed that maximum explosion pressure of flammable vapor was about 3.1~$4.2 kg/cm^2$ and it was reached 3.4 times faster than that at explosion limit. The lower explosion limit was coincided well with Le Chateilier's equation, however, upper explosion limit was not.

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Prediction of Explosion Limit of Flammable Mixture by Using the Heat of Combustion (연소열을 이용한 가연성 혼합물의 폭발한계 예측)

  • Ha Dong-Myeong
    • Journal of the Korean Institute of Gas
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    • v.10 no.1
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    • pp.19-25
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    • 2006
  • Explosion limit is one of the major physical properties used to determine the fire and explosion hazards of the flammable substances. Explosion limits are used to classify flammable materials according to their relative flammability. Such a classification is important for the safe handling, storage, transportation of flammable substances. In this study, the lower explosion limits(LEL) of the flammable mixtures predicted with the appropriate use of the vapor composition and the heat of combustion of the individual components which constitute mixture. The values calculated by the proposed equations were a good agreement with literature data within a few percent. From a given results, It is to be hoped that this methodology will contribute to the estimation of the explosive properties of flammable mixtures with improved accuracy and the broader application for other flammable substances.

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Prediction of the Detonation Limit of the Flammable Gases and Vapors Using the Stoichiometric Coefficient (양론계수를 이용한 가연성가스와 증기의 폭굉한계 예측)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.22 no.3
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    • pp.228-233
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    • 2008
  • Detonation limit is one of the major physical properties used to determine the fire and explosion hazards of the flammable substances. In this study, the lower detonation limits (LDL) and the upper detonation limits (UDL) of the flammable substances predicted with the appropriate use of the heat of combustion and the stoichiometric coefficient. The values calculated by the proposed equations were a good agreement with literature data within a few percent. From a given results, It is to be hoped that this methodology will contribute to the estimation of the detonation limits of for other flammable substances.

A Study on the Effectiveness of Flammable Gas Monitoring System in the Cargo Pump Room of Tanker

  • Kim, Mann-Eung;Lee, Kyoung-Woo;Lee, Young-Ho
    • Journal of the Korean Society of Marine Engineering
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    • v.32 no.3
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    • pp.455-460
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    • 2008
  • The flammable gas monitoring system is to be provided in cargo pump rooms of tankers in accordance with the requirements of SOLAS regulations, and flammable gas detectors are to be arranged in a proper position. In this paper, simulation tests and CFD analysis are carried out under the actual ventilation conditions of pump rooms in the ship in service. Based on the results, a new guidelines for an arrangement of flammable gas detectors are suggested.

A Study on Explosive Limits of Flammable Materials - Explosive Limits of Flammable Binary liquid Mixture by Liquid Phase Compositions - (가연성물질의 폭발한계에 관한 연구 - 액상 조성에 의한 가연성 2성분 액체혼합물의 폭발한계 -)

  • 하동명
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.103-108
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    • 2001
  • Explosive limit is one of the major physical properties used to determine the fire and explosion hazards of the flammable substances. Explosive limits are used to classify flammable liquids according to their relative flammability. Such a classification is important for the safe handling of flammable liquids which constitute the solvent mixtures. Explosive limits of all compounds and solvent mixtures can be calculated with the appropriate use of the fundamental laws of Raoult, Dalton, Le Chatelier and activity coefficient models. In this paper, Raoult,s law and van Laar equation(activity coefficient model) are shown to be applicable for the prediction of the explosive limits in the flammable ethylacetate-toluene system. The values calculated by the proposed equations were a good agreement with literature data within a given percent. From a given results, by the use of the proposed equations, it is possible to predict explosive limits of the other flammable mixtures. It is hoped eventually that this method will permit the estimation of the explosive Properties of flammable mixtures with improved accuracy and the broader application for other flammable stances.

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A Study on Flash Points of a Flammable Substancea - Focused on Prediction of Flash Points in Ternary System by Solution Theory - (가연성물질의 인화점에 관한 연구 -용액론에 의한 3성분계의 인화점 예측을 중심으로-)

  • 하동명;이수경
    • Fire Science and Engineering
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    • v.15 no.3
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    • pp.14-20
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    • 2001
  • The flash points are one of the most important fundamental properties used to determine the potential for fire and explosion hazards of flammable substances. A classification of the flash points is important for the safe handling of flammable liquids which constitute the solvent mixtures. Basic to all flash points behavior are vapor pressure and explosive limits(lower explosive limit and upper explosive limit). The flash points of flammable solvent mixtures can be calculated with the appropriate use of the fundamental laws of Raoult, Dalton, Le Chatelier and activity coefficient models. In this study, the reference values of lower flash points were compared with the calculated values by using Raoult's law and MRSM(modified response surface methodology) model. The lower flash points were in agreement with the predicted by Raoult's law and MRSM model. By means of this methodology, it is possible to evaluate reliability of experimental data of the flash points of the flammable mixtures.

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A New Flame-Stabilization Technology for Lean Mixtures

  • Kim, Duck-Jool;Choi, Gyung-Min
    • Journal of Mechanical Science and Technology
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    • v.14 no.4
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    • pp.426-432
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    • 2000
  • The development of a low-pollution burner is important for saving energy and preserving the environment. A low-pollution burner can be produced by lean-mixture combustion and general combustion technology. The flammable limit of premixed flame is narrower than that of diffusion flame. Producing a lean mixture of fuel results in an effective combustion condition, which in turn produces high load and low pollution. In this study, it was found that the influx of $Q_2$ had an effect on extending the lean flammable limits and flame stabilization in a doubled jet burner. And the flame, consisting of small eddies, can be stabilized by the nozzle neck phenomena.

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A Study on Interacting $CH_4$-Air and $H_2/N_2$-Air Premixed Counterflow Flames (상호작용하는 메탄-수소 예혼합 대향류화염에 관한 연구)

  • Moon, Chang-Woo;Park, Jeong;Gwon, O.-Bung;Bae, Dae-Seok;Kim, Jeong-Soo
    • Journal of the Korean Society of Combustion
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    • v.15 no.1
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    • pp.38-42
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    • 2010
  • Using a counterflow burner, downstream interactions between $CH_4$-air and $H_2/N_2$-Air premixed flames with various equivalence ratios has been experimentally investigated. Flame stability maps on triple and twin flames are provided in terms of global strain rate and equivalence ratio. Lean and rich flammable limits are examined for methane/air and hydrogen/nitrogen/air mixtures over the entire range of mixture concentrations in the interacting flames. Results show that these flammable limits can be significantly modified in the presence of interaction such that mixture conditions beyond the flammability limit can be still burn if it is supported by stronger flame. The experiment also discusses various oscillatory instabilities in a stability map.

Prediction of Temperature Dependence of Lower Explosive Limits for Paraffinic Hydrocarbons (파라핀족탄화수소의 폭발하한계의 온도의존성 예측)

  • 하동명
    • Journal of the Korean Society of Safety
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    • v.15 no.3
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    • pp.71-77
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    • 2000
  • The aim of this study is to investigate the temperature dependence of the lower explosive limit(LEL) at elevated temperature. The temperature dependence of the lower explosive limit is one of the significant indices of flammability and combustibility. By using the literature data, the new equations for predicting the temperature dependence of the lower explosive limits for paraffinic hydrocarbons are proposed. The values calculated by the proposed equations were a good agreement with the literature data. It is hoped eventually that this proposed equations will support the use of the prediction for the lower explosive limit and the flash points of the flammable mixtures.

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Prediction of Explosion Limits of Ethers by Using Heats of Combustion and Stoichiometric Coefficients (연소열과 화학양론계수를 이용한 에테르류의 폭발한계의 예측)

  • Ha, Dong-Myeong
    • Journal of the Korean Institute of Gas
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    • v.15 no.4
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    • pp.44-50
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    • 2011
  • Explosion limit is one of the major combustion properties used to determine the fire and explosion hazards of the flammable substances. In this study, the lower explosion limit(LEL) and upper explosion limit(UEL) of ethers were predicted by using the heat of combustion and stoichiometric coefficients. The values calculated by the proposed equations agreed with literature data within a few percent. From the given results, using the proposed methodology, it is possible to predict the explosion limits of the other flammable ethers.