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염화수소 및 불화수소 영향범위 예측을 위한 간이 방법 개발
원종호(Jongho Won),김병훈(Byounghoon Kim),마병철(Byungchol Ma),윤이(Yi Yoon),조아라(A Ra Jo),천영우(Young Woo Chon),문진영(Jin Young Moon) 한국위험물학회 2016 한국위험물학회지 Vol.4 No.2
Ministry of Environment has been designated 69 accident prevent materials, of which explosiveness or acute toxity is strong so that would cause explosion or serious accidents, as substances requiring preparation for accidents in Chemical Management Act. Among them are toxic and spread out in short time 22 chemicals, which can cause serious damage to the human body and the environment. Prevent measure from chemical release is can be the best practice, however it is also important to estimate the effect distance and minimize the damage for emergency response. In this study, we selected hydrogen chloride and hydrogen fluoride for developing the simplified estimating method and equation to calculate effect distance. Also we calculated the effect distance for toxic endpoints of hydrogen chloride and hydrogen fluoride(release rate 0.001 ㎥/s ~ 10 ㎥/s) at different ground roughness(open country and urban) based on the worst/ alternative case scenario by using the ALOHA, KORA and PHAST programs. Finally, we find the dispersion trends and suggest a simplified quick estimate formula such as y=Ax<SUP>B</SUP> (R² 0.95). The new method of this research will be easy and useful for estimating effect distance without simulating risk assessment tools.
반응표면법과 ANOVA 기반의 수소 누출에 대한 유효인자 분석
이준서(JUNSEO LEE),오세현(SEHYEON OH),안승효(SEUNGHYO AN),김은희(EUNHEE KIM),마병철(BYUNGCHOL MA) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
While hydrogen is widely used, it has a low minimum ignition energy, raising safety concerns when using it. This research studied which parameters are the key variables in the hydrogen release and diffusion. These parameters were divided into six process variables in the initial release and two environmental variables in the dispersion. One hundred and twenty cases were selected through design of experiment, and the end-point in each case were analyzed using PHAST. Afterwards, an end-point prediction model was developed using RSM and ANOVA, and the impact of each variable on the endpoint was analyzed. As a result, the influence of eight variables was graded. The nozzle diameter had the greatest influence on the end-point, while the pipe roughness coefficient had no effect on the end-point. It is expected that these results will be used as basic data to improve safety across all fields of hydrogen handling facilities.
수소충전소 폭발위험장소 완화를 위한 확산차단벽 최적화 설계
안승효(SEUNGHYO AN),오세현(SEHYEON OH),김은희(EUNHEE KIM),이준서(JUNSEO LEE),마병철(BYUNGCHOL MA) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
Hydrogen emphasis on safety management due to its high potential for accidents from wide explosive limits and low ignition energy. To prevent accidents, appropriate explosion-proof electrical equipment with installed to safe management of ignition sources. However, designing all facilities with explosionproof structures can significantly increase costs and impose limitations. In this study, we optimize the barrier to effectively control the initial momentum in case of hydrogen release and form the control room as a non-hazardous area. We employed response surface method (RSM), the barrier distance, width and height of the barrier were set as variables. The Box-Behnken design method the selection of 15 cases, and FLACS assessed the presence of hazardous area. Analysis of variance (ANOVA) analysis resulting in an optimized barrier area. Through this methodology, the workplace can optimize the barrier according to the actual workplace conditions and classify reasonable hazardous area, which is believed to secure safety in hydrogen facilities and minimize economic burden.