• Title/Summary/Keyword: Fire.explosion

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Test Facility of Battery Simulator for Dynamic Characteristics and Safety Evaluation in Lithium-ion Battery (리튬이온 배터리 동특성 및 안전성 평가를 위한 배터리 시뮬레이터 시험설비)

  • Sungin Jeong;Yongho Yoon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.24 no.2
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    • pp.133-138
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    • 2024
  • Lithium-ion batteries are used in many fields due to their high energy density, fast charging conditions, and long cycle life. However, overcharging, over-discharging, physical damage, and use of lithium-ion batteries at high temperatures can reduce battery life and cause damage to people due to fire or explosion due to damage to the protection circuit. In order to reduce the risk of these batteries and improve battery performance, the characteristics of the charging and discharging process must be analyzed and understood. Therefore, in this paper, we analyze the charging and discharging characteristics of lithium-ion batteries using a battery charger and discharger and simulator to reduce the risk of loss of life due to overcharge and overdischarge, as well as casualties from fire and explosion due to damage to the protection circuit.

Study of Fire and Explosion Prevention of an Internal Floating Roof Tank (내부 부상형저장탱크(IFRT) 화재·폭발 예방대책에 관한 연구)

  • Koo, Chae-Chil;Choi, Jae-Wook
    • Fire Science and Engineering
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    • v.33 no.1
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    • pp.45-49
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    • 2019
  • This study examined the safety of storage tanks by analyzing the causes of fire on outdoor storage tanks. The outdoor storage tank is a fixed device for the long-term storage of dangerous goods and consists of a tank body and accessories; the accessories consist of a vent system, breather valve, flame arrestor, etc. The flame arrestor is a necessary safety measure to prevent fire explosions on outdoor storage tanks. On the other hand, it has been suggested that the installation of a flame arrester is necessary to compare the domestic and international standards. In addition, the flame arrester should be installed in the existing outdoor storage tanks, to complement foreign standards because there are not enough domestic standards to verify the performance of the flame arrester.

Consequence Analysis of Toxic Gases Generated by Fire of Lithium Ion Batteries in Electric Vehicles (전기자동차 내 리튬이온전지 화재로 발생하는 독성가스의 위험성 분석)

  • Oh, Eui-young;Min, Dong Seok;Han, Ji Yun;Jung, Seungho;Kang, Tae-sun
    • Journal of the Korean Institute of Gas
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    • v.23 no.1
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    • pp.54-61
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    • 2019
  • As the market for portable electronic devices expands, the demand for Lithium Ion Battery (LIB) is also increasing. LIB has higher efficiency than other secondary batteries, but there is a risk of explosion / fire due to thermal runaway reaction. Especially, Electric Vehicles (EV) equipped with a large capacity LIB cell also has a danger due to a large amount of toxic gas generated by a fire. Therefore, it is necessary to analyze the risk of toxic gas generated by EV fire to minimize accident damage. In this study, the flow of toxic gas generated by EV fire was numerically analyzed using Computational Fluid Dynamic. Scenarios were established based on literature data and EV data to confirm the effect distance according to time and exposure standard. The purpose of this study is to analyze the risk of toxic gas caused by EV fire and to help minimize the loss of life and property caused by accidents.

A Study on the Activation·Specification of 119 Rescue & Care in JeJu (제주도 119구조·구급대의 활성화 및 전문화 방안)

  • Koh, Jae-Moon;Kim, Tae-Min;Kim, Hyo-Sik;Lee, Young-A
    • The Korean Journal of Emergency Medical Services
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    • v.6 no.1
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    • pp.153-168
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    • 2002
  • Since 1992, conventional fire fighting businesses have been converted into a metropolitan autonomous fire fighting system to be ready for a variety of disasters. However, the corresponding investment has been overlapped due to the non-integration of businesses to prevent any potential disasters, and a series of collaborative systems have been not functioning so well. In the meantime, our fire fighting sector has been trying to set up its own clean and faithful position by abolishing any inconvenient system or outsourcing private sectors, and expanded its work scope from conventional fire fighting even to rescue and emergency works. While focusing on handling disaster, the fire fighting sector has been widely trusted and reliable throughtout our nation. Moreover, our fire fighting sector has secured nation wide mobile organizations, technical personnel by field, special equipments and independent communication network. In addition, the fire fighting sector has knowledges, expertise and capabilities required for managing disasters, while in charge of almost every disaster management works including fire, explosion, collapse, disaster and flood. It becomes an organization for comprehensive disaster management under an absolute national trust, which is based on the system for prevention, preparation and countermeasure against a variety of disasters. Thus, our fire fighting sector must make many efforts and try to modernize conventional education and training. The ways to facilitate rescue and emergency works may include the nurture of technical fire fighting personnel along with modernized equipments, the reinforcement of rescue and emergency education, the facilitation of operating civil defense corps, the facilitation of operating volunteer fire fighting corps, the better arrangement of 119 briefing room for public healthcare in provincial offices, the sterilization of rescue instruments and equipments the better repair education for emergency rescue member, the establishment of regional emergency assistant system and the expansion of fire fighting personnel and equipments. In terms of reinforcing the functions and services of rescue 119 and emergency corps, we must review the following considerations: Building up security system along with operational expansion, building up a system for emergency medical treatment, building up a comprehensive information management system for rescue and emergency, constructing a provincial safety museum and so forth. For the ways to better the works of rescue 119 we can review the following considerations : Improving the education for fire fighting training corps under Jeju Provincial Fire and Disaster Management Department, providing rescue members with more opportunities for clinical practices, enhancing the morale of rescue members, installing a comprehensive briefing room for emergency rescue members, building up medical networks along with reasonable policies for information service, operating the consulting system for rescue 119 and so on. If these requirements are met, it is expected that the fire fighting departments in Jeju province can cope with every accident and disaster a little more rapidly and quickly in compliance with local needs, so that they can keep their own position as a public fire fighting organization which may be trusted by the public.

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Discussion on Formulation Process and Configuration of Fire-Fighting Vulnerable Zone Model (소방취약지 모델의 구성과 정립프로세스 논의)

  • Kim, Seong Gon;Chang, Eun Mi;Choi, Gap Yong;Kim, Hi Tae
    • Spatial Information Research
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    • v.22 no.3
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    • pp.71-77
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    • 2014
  • There are numbers of unpredictable risk factors in the disaster scenes such as fire, explosion and fail to early life-saving or holding the flames which can lead to massive damage. In particular, fire-fighters who arrive on the scene within 5 minutes after dispatching, have a limitation to get aware to the situation of scene fully, because of immediate deploy to disaster scene with limited information. This situation may lead to disturbance that fire-fighters perform effective fire-fighting activities, to put fire-fighter's life at risk by misjudge the situation. Previous domestic and International studies focused vulnerability for spatial area or features which can damage to life and property in the event of anticipated. In this study, we have been developed fire-fighting vulnerable zone model that can analyze comprehensively hindrance factors for fire-fighting activities targeting whole life cycle of fire-fighting activities from dispatch to fire suppression or life-saving. In addition, we have been given shape to finality and applicability for our model by defining the new concept of fire-fighting vulnerable zone which can be distinguished from the concept of fire vulnerable area in previous studies. The results of this study can be used to analysis fire-fighting vulnerable zone type analysis, establish fire-fighting policies and improve the performance of decision-making process.

Review on the Process Safety of $SiH_{4}$ Gas used in Semiconductor and FPD Field (반도체 및 FPD 분야에 사용되는 $SiH_{4}$ 가스의 공정 안전 고찰)

  • Kim, Joung-Cho;Kim, Hong
    • Journal of the Korean Society of Safety
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    • v.22 no.4
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    • pp.32-36
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    • 2007
  • When the vacuum system for the process of $SiH_{4}$ gas used in the semiconductor and FPD field is partially vented from vacuum to atmospheric state, a fire often occurs due to auto-ignition of $SiH_{4}$ gas. In order to prevent the fire, the concentration of $SiH_{4}$ should be kept under LFL. This means that the higher capacity pump is needed to meet the process conditions as well as the condition that the concentration of $SiH_{4}$ should be kept under LFL. In this article, we conducted the injection of the dilution gas at the manifold between booster pump and dry pump compared with the typical method that the dilution gas was injected into inlet port of booster pump using computer simulation. According to the result, we can flow further more purge gas for safety without any change of the condition in the process chamber, which means that the higher capacity pump is not required for safety in some cases.

The Prediction of Lower Explosion Limit of n-Hexadecane (n-Hexadecane의 폭발하한계 예측)

  • Ha, Dong-Myeong;Park, Sang-Hun
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2013.04a
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    • pp.163-163
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    • 2013
  • 최근의 수많은 산업 현장에서 취급하고 있는 각종 화학물질은 잠재적 위험성이 크므로 보관, 수송 및 취급할 때 특별한 주의가 필요하다. 공정 설계 시 정확하지 않은 폭발한계를 사용함으로서 사고가 유발되는 경우가 많다. 따라서 사업장에서 사용되고 있는 화학물질의 화재 및 폭발 특성치인 인화점, 폭발한계 등을 정확히 파악하는 것은 중요하다. 인화점은 하부인화점과 상부인화점으로 나누고 있고 있으며, 인화점은 가연성 액체의 화재 위험성을 나타내는 지표로써, 가연성액체의 액면 가까이서 인화할 때 필요한 증기를 발산하는 액체의 최저온도 또는 점화원 존재시 인화가 일어날 수 있는 최저온도, 그리고 가연성증기의 포화증기압이 공기와 혼합기체의 폭발한계 하한농도와 같게 되는 온도로 정의한다. 폭발한계는 발화원이 존재할 때 가연성가스와 공기가 혼합하여 일정 농도범위 내에서만 연소가 이루어지는 혼합범위를 말한다. 본 연구에서는 실제 공정에서 사용되고 있는 n-Hexadecane의 인화점을 측정하여 이를 기존 문헌값과 비교 하였고, 측정된 인화점을 이용하여 폭발한계를 예측하였다. 예측된 폭발한계를 여러 문헌에 제시된 자료과 비교하여 공정안전에 타당한 자료를 제시하였다. 본 연구는 n-Hexadecane을 취급하는 공정에서 안전 확보의 중요한 지침 마련과 MSDS D/B의 최신화에 유용한 정보를 제공하는데 목적이 있다.

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Reliability Assessment of Forest Fire on EHV Polymer Insulator Strings (송전용 폴리머애자의 산불 영향 신뢰성 평가)

  • Min, Byeong-Wook;Shin, Tai-Woo;Choi, In-Hyuk;Choi, Han-Yeol;Park, Jae-Ung;Yu, Kun-Yang
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.436-437
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    • 2006
  • Porcelain insulators have generally been used in Korea but polymer insulators which are superior in that they are light weight, explosion proof, impact proof, economical with construction characteristics, have been in use for the 154kV transmission line since 1999 following a worldwide trend towards the reduced weight, simplification and compact usage of new material insulators. However there have been approximately 500 cases of forest fires in Korea, so the transmission lines that for the most part pass through mountainous areas have been highly effected and the highly polymerized compound polymer insulator has raised concern about reliability in cases of exposure to forest fires. Therefore for the reliability assessment of the effect of forest fires on polymer insulators, mechanical and electrical characteristics are analyzed by an artificial flare test device and transmission facility surrounding conditions along with forest fire characteristics are surveyed. In addition to this, actual 90kV energized transmission line was tested with an artificial forest fire and the expanded usage of polymer insulators is presented through the analysis of mechanical and electrical characteristics and physical properties, and a study on the influence of forest fires on polymer insulators.

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A Study on the Consequences of Underground High Pressure Natural Gas Pipelines (고압 매몰 천연가스 배관 누출사고 피해해석에 관한 연구)

  • Lee, Seungkuk;Shin, Hun Yong
    • Journal of the Korean Institute of Gas
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    • v.17 no.2
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    • pp.44-49
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    • 2013
  • Due to rapid rise of consuming rate for natural gas, installation and operation of high pressure natural gas pipeline is inevitable for high rate of gas transportation. Accordingly incidents on the underground high pressure natural gas pipeline come from various reasons will lead to massive release of natural gas and gas dispersion in the air. Further, fire and explosion from ignition of released gas may cause large damage. This study is for release rate, dispersion and flash fire of natural gas to establish a safety management system, setting emergency plan and safety distance.

The Measurement and Prediction of Maximum Flash Point Behavior for Binary Solution (이성분계 용액의 최대인화점 현상의 측정과 예측)

  • Ha, Dong-Myeong;Lee, Sungjin
    • Fire Science and Engineering
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    • v.27 no.5
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    • pp.70-74
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    • 2013
  • The flash point is one of the most important physical properties to charaterize fire and explosion hazard of liquid solutions. The maximum flash point of liquid mixture is larger than those of the individual components. In this study, the flash points of 2-pentanol+acetic acid system were measured by Seta flash closed cup tester. This system exhibited the maximum flash point behavior. The flash points were estimated by the Raoult's law and the optimization methods using the van Laar and Wilson equations. The calculated values by optimization methods were found to be better than those based on the Raoult's law.