Large quantities of dangerous substances are transported daily, which in the event of an accident can have serious consequences for people and the environment. Ammonia is one of the dangerous chemicals being transported. Ammonia is an irritant chemical that can seriously affect humans if over-exposed and has serious consequences for the environment. Exposure to high concentrations can lead to acute poisoning and even death. In the theoretical part of my master's thesis, I investigated the properties and harmful effects of ammonia on people and the environment, and studied in more detail the risks and causes of accidents in the transport of dangerous substances. I also researched the pros and cons of the ALOHA computer program. The purpose of the master's thesis was to simulate the consequences of an uncontrolled release of ammonia from a tank using the computer program ALOHA. Depending on the input data, the program draws different areas for us, such as areas of dangerous concentrations, areas of flammability and areas of thermal radiation. I assumed that the accident happened in Škofja Loka, on the regional road Škofja Loka - Železniki, where there is a high concentration of population. Nearby are schools, kindergartens, a sports hall, a home for senior citizens and many residential buildings. The focus was on determining how different meteorological parameters affect the consequences of ammonia release and what part of the surrounding buildings and settlements are occupied by the exposure areas. I performed simulations for three different scenarios. The first scenario represented the release of ammonia from the tank, where it evaporated, but did not ignite, and we analyzed the areas of dangerous concentrations and areas of flammability. The second scenario was the occurrence of a Jet fire in which we considered areas of thermal radiation. In the third scenario, I also considered thermal radiation zones, but for the BLEVE explosion. I simulated all the mentioned scenarios in four seasons. In addition, I was also interested in what effect different wind speeds have on areas of dangerous concentrations and on the area of flammability. With this aim in mind, I analyzed the first scenario where the chemical evaporated but did not catch fire in the winter season for different wind speeds. Based on the results of the simulations, I found that the meteorological parameters have a great influence on the size of the areas of dangerous concentrations and areas of flammability, but they do not have a great influence on the areas of thermal radiation. I found that wind speed is an important meteorological parameter that affects the consequences of ammonia release, especially in areas of flammability.
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