The Multi-risk Overlaps Impact Analysis Induced by Bulk (mass) Liquefied Ammonia Leakage in West Dock (wharf) of Taichung.

• Main Authors: Shen, Yu-Tzu, 沈育慈
• Other Authors: Hsieh, Ming-Hong
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/ht2me8

碩士 === 中臺科技大學 === 環境與安全衛生工程系碩士班 === 102 === Ammonia is a both acute toxicity, high corrosive hazardous gases, in recent years, both in Taiwan and abroad ammonia leak incident occurred, and often have caused serious casualties when toxic gas leaked, in addition to explore the occupational safety and health and environmental impact related, the operational impact and risk further explore the events that may arise from the plant is also an important issue. In this study, a domestic home chemical plant ammonia leak trace analysis may lead to hazardous events exploration, for example, the use of the U.S. EPA and NOAA ALOHA software developed for high pressure liquefied Acute toxicity liquid - liquid ammonia storage tank (Ammonia, NH3) analysis and Discussion hazardous substances from the source to multiple risks begin to build a stack mechanism to assess the plant manufacturing process chain harm if handled improperly or chemical leaks and other conditions will lead to the, by simulating the diffusion mode and lethal range of discussion and analysis. According study result, Taiwanese summer and winter are the most commonly southerly breeze and the northeast monsoon , the risk for multiple stacking multiple risk analysis to explore the overlap analysis, simulation of the biggest risks for losses arising from the plant . The results from the present study that even at the lowest hazard southerly breeze , 8 -inch pipeline ruptured ammonia tank , if the explosion caused a fire , will have a ripple effect , not only led to three ammonia tanks around the continuous explosion to explosion for example, its concentration in the vapor cloud explosion to explosion limit of 200000ppm distances up to 5.4 km ( area 3988000 m2); ammonia tank explosion and blowing northeasterly , if BLEVE occurs, the thermal radiation 37.5 kW / m2 distance up to 22 m ( area of 15300 m2). Because ammonia toxic substances , according to the Probit equations to 10 minutes of mortality rate of 10 % , 50 % and 99 % respectively, the concentration of 4376 ppm ( area of 351000 m2, 6.7 km away ), 10779 ppm ( area of 78000 m2, distance 4.6 km) and 55613ppm ( area 13000 m2, distance 1.8 km), the scope of the harm spread to the nearby power plant , LNG storage tanks and chemical plants , seemingly dangerous situation , in fact, still can cause harm to follow the chain can not imagine that plant personnel and property risks causing serious damage and even cause toxic hazards threaten the health of community residents . The result indicated that the risk of multiple stacked mechanism can explore the full impact of the leak could cause actual plant with the consequences, according to investigate the proliferation of single leak from the tank, but it ignores the actual chemicals in the operation of the chemical is not a single set, and Once the leakage cause harm, not only will it cause harm to an individual tank, can trigger a chain hazards surrounding chemicals, and lead to more serious consequences. It’s not only a more complete process of hazard identification and risk assessment, the better the planning and operation set accordingly necessary control measures and emergency response.