20.500.12556/RUL-164973 Simulacija izpusta metil metakrilata v programu ALOHA Simulating the release of methyl methacrylate in ALOHAe V magistrskem delu je bila izvedena simulacija nenadzorovanega izpusta metil metakrilata, ki se je zgodil ob zaključku transporta, ko je tovornjak s cisterno snov pripeljal do končne točke. Do nezgode je prišlo na parkirišču podjetja, ki omenjeno snov uporablja pri svojih nadaljnjih procesih, kjer jo predeluje v končne produkte, kot so akrilna pleksi stekla. Vzrok nenadzorovanega izhajanja snovi je bila dotrajanost materiala na dnu rezervoarja, kjer je nastala odprtina, skozi katero je snov iztekala na tla in tam tvorila lužo. Pri izvedbi eksperimentalnega dela sem si pomagal z uporabo programa ALOHA, ki je za izvedbo tovrstnih simulacij zelo primeren. Program omogoča vnos vrste nevarne snovi, ki je bila udeležena v nezgodi, prav tako omogoča izbiro med različnimi scenariji nezgodnega dogodka, kjer pa je bil za namen magistrskega dela izbran scenarij iztekanja snovi iz vodoravne cisterne. Poleg tega lahko v program vnesemo tudi poljubne meteorološke podatke, ki naj bi bili prisotni na dan nezgode. V magistrskem delu je bila simulacija izvedena za dva ločena dogodka, pri vsakem pa so bili trije možni scenariji. Prvi dogodek je predstavljal simulacijo pri poletnih meteoroloških razmerah, drugi pa pri zimskih meteoroloških razmerah. Omenjene razmere so bili tudi edini parameteri, ki so se med obema simulacijama spreminjali. Po končani simulaciji se je izkazalo, da je program ALOHA primeren za izvedbo enostavnejših nezgodnih dogodkov, kjer je udeležena zgolj ena snov, medtem ko ne bi bil primeren za simulacijo dogodka, kjer je udeleženih več snovi. To je tudi ena večjih pomanjkljivosti, poleg tega, da pri izrisu območja nevarnih koncentracij in izrisu območja toplotnega sevanja ne upošteva reliefnih razlik površja, kar tudi lahko ključno vpliva na obseg širjenja nevarnosti. Pri vsakem nezgodnem dogodku je prišlo do izrisa nevarnih območij, ta so bila ponazorjena z rdečo, oranžno in rumeno barvo, pri čemer so koncentracije snovi oz. toplotno sevanje v rdečem območju najvišji, medtem ko so v rumenem območju najnižji. Rezultati same simulacije so si v dveh primerih, kjer je šlo za preučevanje toplotnega sevanja na okolico, precej podobni. Torej pri scenariju BLEVE eksplozije in pri scenariju, kjer snov izteka iz cisterne na tla, kjer pa nastane luža, ki se vname in gori kot bazenski požar. Nekaj razlik je bilo prisotnih le pri prvem scenariju, torej ko gre za iztekanje snovi iz cisterne prav tako na tla, le da se snov nato ne vname, ampak le izhlapeva v ozračje. V tem primeru so območja nevarnosti, ki jih je program izrisal, nekoliko večja pri poletnih meteoroloških razmerah, ko je bil prisoten močnejši veter. In the master thesis, an uncontrolled release of methyl methacrylate was simulated, which occurred at the end of the transport, when the tanker truck brought the substance to its final destination. The accident occurred in the car park of a company that uses the substance in its downstream processes, where it is processed into end products such as acrylic Plexiglas. The uncontrolled release of the substance was caused by deterioration of the material at the bottom of the tank, where an opening was created through which the substance leaked out onto the ground and formed a puddle. In carrying out the experimental work, I used the ALOHA programme, which is very suitable for carrying out this type of simulation. The programme allows the input of the type of hazardous substance involved in the accident, and also allows the selection between different accident scenarios, where for the purpose of the master's thesis the scenario of a substance leaking from a horizontal tank was chosen. In addition, any meteorological data that is expected to be present on the day of the accident can be entered into the software. In the master thesis, the simulation was carried out for two separate events, each with three possible scenarios. The first event was simulated under summer meteorological conditions and the second under winter meteorological conditions. These conditions were also the only parameters that varied between the two simulations. After the simulation, it turned out that ALOHA is suitable for simpler accident events where only one substance is involved, while it would not be suitable for simulating an event where several substances are involved. This is also one of the major drawbacks, besides the fact that it does not take into account surface relief differences when plotting the area of hazardous concentrations and the area of thermal radiation, which can also have a key influence on the extent of hazard propagation. For each incident, the hazard zones were plotted and represented in red, orange and yellow, with the highest concentrations of substances or thermal radiation in the red zone and the lowest in the yellow zone. The results of the simulation itself are quite similar in the two cases where thermal radiation to the surroundings was studied. So in the BLEVE explosion scenario and in the scecear scenario, where the material leaks out of the tank onto the ground, where it forms a puddle that ignites and burns like a pool fire. There were some differences only in the first scenario, i.e. when the substance is released from the tanker also onto the ground, except that the substance does not then ignite, but only evaporates into the atmosphere. In this case, the hazard areas plotted by the programme are slightly larger for summer meteorological conditions, when stronger winds were also present. metil metakrilat ALOHA simulacija izpusta nezgodni dogodek methyl methacrylate ALOHA release simulation accidental incident true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-11-19 13:45:00 2024-11-19 13:45:11 2024-12-23 10:40:27 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 22814 220223235 Brus_Timotej_-_Simulacija_izpusta_metil_metakrilata_v_programu_ALOHA.pdf Brus_Timotej_-_Simulacija_izpusta_metil_metakrilata_v_programu_ALOHA.pdf 1 C42CC93903A7ABE3710775FE36A5E275 d0f095e59a583d89709d073cab841c79535a4f8b75cba5e7dd9d804d2f31567f bcaafb06-a673-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=195858 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0