• Title/Summary/Keyword: fire.explosion

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The Study about The Minimum Ignition Energy for Electrostatic Discharge in The Gasoline-air Mixture (정전기 방전에 의한 개소린-공기혼합기체의 최소착화에너지에 관한 연구)

  • 황명환;이덕출
    • Fire Science and Engineering
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    • v.10 no.1
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    • pp.3-9
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    • 1996
  • Electrostatic charge is generated in large scale or high speed processes dealing with materials with large resistance, or under complicated condition. Fire and explosion often occur due to electrostatic charge accumulated in flammable gases, vapor, liquids and powder. It is usually very difficult to verify the cause of accidents as well as the prevention. In this study, it is shown that the needle electrode needs the electrode gap from 1.8mm to 3.8mm, sphere electrode and plate electrodes need the electrode gap of 1.9mmfor the minimum ignition energy. The sphere electrode and the plate electrode requires 12.8mJ and 3.2mJ of minimum ignition energy respectively with the electrode gap of 1.1mm. The ignition voltage rises to very large value as the ground resistance increases.

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A Study on the Efficiency of Dust Explosion According to Particle Size and Concentration of Dust Using the Cone Calorimeter (산소소모열량계를 이용한 분진의 입경과 농도에 따른 분진폭발의 효율에 대한 연구)

  • Kim, Yun-Seok;Moon, Sung-Woong;Woo, In-Sung;Rie, Dong-Ho
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2011.04a
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    • pp.116-119
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    • 2011
  • 분진의 입경과 농도의 변화에 의한 분진의 폭발압력과 압력상승속도 및 그에 따른 분진폭발지수(Kst), 최소점화에너지(MIE) 및 폭발범위 등 분진폭발에 관한 많은 연구가 진행되고 있다. 폭발 메커니즘의 이해와 이를 통한 예방을 위해서는 분진폭발의 폭발효율과 열방출률(Heat Release Rate)에 관한 연구도 필요하다. 본 연구에서는 산소소모열량계를 이용하여 분진폭발 전후의 열방출률의 차이를 통하여 폭발효율과 폭발의 에너지를 정량화하고, 이를 통해 분진폭발 위험도의 정량적 평가기준을 제시하였다.

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Risk Evaluation of Fire and Explosion Considering the Property of Self-Reactive Materials (자기반응성물질의 화재.폭발 위험성 평가)

  • Lee, Bong-Woo;Song, Haak;Moon, Deog-In;Lee, Chang-Woo
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2011.11a
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    • pp.364-368
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    • 2011
  • 최근 급속히 발전하고 있는 과학기술과 산업발달에 따라 화학물질, 위험물의 사용, 저장 및 운송물이 날로 증가하고 있다. 이러한 물질들은 우리의 일상생활과 인류문화 발전에 크게 기여하고 있지만 인화성, 폭발성 등의 잠재위험성을 가지고 있다. 세계 각국은 물질의 분류와 표시가 달라 국제무역에서 많은 사고가 증가하고 있는 실정이다. 이 연구의 목적은 자기반응성물질의 화재 폭발 위험성을 평가하고, 국제적인 시험방법과 국내 시험방법으로 시험하여 연관성 및 상관관계를 알아보고 선진화된 시험방법을 국내실정에 적합하게 제시하는데 있다.

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Experiment and Simulation of Diffusion of Gas Released from the Relief Valve of a Gas Cylinder for a Portable Gas Range (압력 방출밸브를 장착한 이동식 부탄연소기용 부탄캔의 분출가스 확산 실험 및 해석)

  • Kang, Seung-Kyu;Choi, Kyung-Suhk;Yoon, Joon-Yong
    • The KSFM Journal of Fluid Machinery
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    • v.12 no.1
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    • pp.16-21
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    • 2009
  • In the last five years, 91 accidents from portable gas ranges and non-refillable metallic gas cartridges have occurred. The gas cylinder installed with a relief valve was developed to prevent an explosive accident from the gas cartridge. In this study it was carried out to evaluate the safety of a gas cylinder mounted with a relief valve which can prevent an explosion. Under the real using condition and the extreme condition the gas cylinder is heated with an electric heater. Simultaneously, the operating pressure is checked and the suitability of releasing flux is evaluated. And the possibility of fire or explosion was tested when the gas was released from the relief valve at the real using condition. Using a numerical simulation method, the diffusion of butane gas released from a relief valve was visualized.

Consequence Analysis of Gas Explosion in LPG Vessel Retail Store Which is Located around Apartment Complex (LPG 판매소에서 가스 폭발이 주위 아파트에 미치는 영향 평가)

  • Lee Su-Kyung;Bae Young-Bum;Oh Jeong-Gyu
    • Journal of the Korean Institute of Gas
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    • v.10 no.3 s.32
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    • pp.48-53
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    • 2006
  • In case of fire and explosion which resulted from LP gas release of LPG vessel retail store, the populated area such as apartment complex is supposed to be damaged either partially or totally. To estimate the damage of LP gas explosion, we conducted quantitative risk analysis procedure as has been recommended by AIChE/CCPS. For incident scenario selection, event tree analysis was proposed. TNT equivalent method, SAFER Trace v.8.0 and probit model were also used for consequence analysis. The various methods and analyses which were performed in this study are presented with the effect zones in the layout.

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Measurement and Prediction of Combustion Properties of Styrene (스티렌의 연소특성치 측정 및 예측)

  • Ha, Dong-Myeong;Na, Byeong-Gyun
    • Journal of the Korean Institute of Gas
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    • v.17 no.4
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    • pp.70-76
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    • 2013
  • For the safe handling of styrene, this study was investigated the explosion limits of styrene in the reference data. The flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. As a results, the lower and upper explosion limits of styrene recommended 0.9 Vol.% and 8.0 Vol.%, respectively. The lower flash points of styrene by using closed-cup tester were experimented 29C31C29C31C. The lower flash points of styrene by using open cup tester were experimented 32C36C32C36C. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for styrene. The experimental AIT of styrene was 460C460C.

A Research on the Shotcrete Tunnel Application to Concrete mixing PET Fiber (PET FIBER를 혼입한 콘크리트의 숏크리트 터널 적용에 관한 연구)

  • Kim, Joo-Seok;Yoo, Sang-Geon;Lee, Yong-Jun;Shin, Hyum-Seong;Kim, Eun-Kyum
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.928-934
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    • 2008
  • Resently, Fiber Reinforced Concrete is used for not only preventing crack of concrete but also reinforcing general methods. Steel Fiber and PP(poly-propylene) Fiber are usually used as fiber reinforced materials. However, using these materials for shotcrete on Railway tunnel can cause some problems such as damage of pressure hose and shotcrete rebound. In addition, Steel fiber is an expensive material and it can cause safety problems during applying to shotcrete. PP Fiber can cause a problem in fiber balling during applying to shotcrete railway tunnel construction. A purpose of the research is applying a development of PET(Poly Etylene Terephtalate) fiber by recycling pet bottles to the shotcrete tunnel exposed to explosion spalling. To investigate the reinforcement effect of the PET fiber, some basic tests are accomplished to physical properties and explosion spalling by fire. As a result of the tests, a concrete mixing the PET fiber has stronger resistance effect in the explosion spalling by high temperature than another strong fiber concrete does, and that the former concrete is also equal or more effective on the result of the above tests to physical properties like compression and strain than the latter one is demonstrated.

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Transient Analysis of Heat Transfer and Pressure Variation for LPG Tank with Metal Explosion Suppression Material (금속폭발억제재가 충진된 LPG 탱크의 비정상 열전달 및 압력변화 해석)

  • Kim H. Y.;Chang H. W.;Chun C. K.
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.16 no.4
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    • pp.406-414
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    • 1987
  • As one of the explosion suppression methods of LPG tank exposed to hot environment by an accident or fire, some material which has large heat capacity and thermal conductivity can be installed inside the LPG tank in order to suppress the temperature increasement of tank wall. In the present study, theoretical model for the horizontally locating cylindrical LPG tank with and without the aluminum explosion suppression material has been developed to predict the characteristics of system. As a parametric study, effects of two major parameters, thickness of material filling and initial vapor volume fraction, on the time variation of wall temperature, temperature and pressure in tank are numerically examined. The results of present study show that the thickness of material filling does not give big differences in the suppression characteristics when the thickness of filling is larger than three inches. In case of material filling, there are marked suppression effects to the increase-ment of wall temperature, average vapor temperature and pressure in tank compared with the case of no filling.

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Study on Fire Risk of Air Conditioner through Fire Cases (화재사례를 통한 에어컨의 화재위험성 연구)

  • Choi, Seung-Bok;Choi, Don-Mook
    • Fire Science and Engineering
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    • v.31 no.5
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    • pp.70-77
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    • 2017
  • As the quality of live gets better, the frequency of using air conditioner is along drastically increasing. On that matter, setting up measures of preventing increasing fire cases has been required. 43,413 fire cases occurred in last 2016, the cases occurred by electricity account for about 20%(8,655 cases). Among the electricity cases, the amount of cases occurred with air conditioner issues covers 1.5%; causes of the fire incidents vary, including incomplete contacts, short circuits, tracking, and such. In this study, we intend to investigate the case of ignition at the connection point where the power cord connected to the outdoor unit is arbitrarily connected during the air conditioner installation process, and to propose preventive measures against the cause in order to reduce the damage of life as well as the property from electric fire incidents.