magistrsko delo
Anita Sovič (Author), Andreja Nemet (Mentor), Zdravko Kravanja (Co-mentor)

Abstract

Varnost v kemijskih procesih postaja vse bolj pomemben vidik že v fazi načrtovanja procesa. V tem magistrskem delu smo upoštevali vidik varnosti v fazi načrtovanja omrežja toplotnih prenosnikov (OTP). Pri tem smo ocenili inherentno varnost s pomočjo mešano celoštevilskega nelinearnega programirnega (MINLP) modela najprej z osnovnim modelom. Nato smo izvedli občutljivostno analizo z različnimi tipi toplotnih prenosnikov, pri čemer smo primerjali ploščine toplotnega prenosa, mase prisotnih snovi, tlačne padce ter razmerja med volumnom in ploščino v toplotnih prenosnikih. Za vsak prenos smo dimenzionirali primeren prenosnik toplote. Izračunane podatke smo nato vstavili v posodobljen model za celotno OTP. Tako dobljene vrednosti ploščin in indikatorjev tveganja smo primerjali z začetnimi vrednostmi. Ugotovili smo, da so bile začetne ploščine vseh toplotnih izmenjevalcev precenjene. Posledično so bili napačno ocenjeni tudi stroški investicije in indikatorji tveganja. Nato smo za izbrane dimenzije toplotnih prenosnikov primerjali indikatorje tveganja za toksičnost, vnetljivost in eksplozivnost med rezultatoma, ko nismo upoštevali natančnih mer toplotnih prenosnikov ter pri upoštevanju natančnih dimenzij toplotnih prenosnikov. Rezultati kažejo, da ima natančno dimenzioniranje prenosnika za posamezne prenose toplote velik vpliv na oceno varnosti v OTP. Z dodatkom natančnega dimenzioniranja prenosnikov toplote smo omogočili natančnejše načrtovanje OTP in realnejše ocenjevanje njihove varnosti.

Keywords

inherentna varnost;omrežje toplotnih prenosnikov;simultana sinteza;magistrske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: [A. Sovič]
UDC: 66.021.4(043.2)
COBISS: 22657302 Link will open in a new window
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Downloads: 83
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Other data

Secondary language: English
Secondary title: Heat exchanger network synthesis with simultaneously considering safety
Secondary abstract: Importance of safety in chemical processes is increasing already in the first phases of design. This master's thesis takes into account the safety aspect of heat exchangers network (HEN) in the design phase. In doing so, inherent safety was assessed using the mixed-integer nonlinear programming (MINLP) model, taking into account the precise dimensions of the heat exchangers. A sensitivity analysis was performed with different types of heat exchangers, where surfaces of heat transfer, mass of substances present, pressure drops and the ratio of volume to surface in heat exchangers were compared. We then compared risk indicators for toxicity, flammability and explosiveness for the selected dimensions of the heat exchangers between the results when the exact dimensions of the heat exchangers were considered and when they were not taken into account. The results show that accurate sizing of exchangers for individual heat transfers has a major impact on safety assessment of the HEN. A suitable heat exchanger was dimensioned for each heat exchange, and the calculated data was then inserted into the updated model for the entire HEN. The surface values and risk indicators obtained in this way were compared to the initial values. The initial surfaces of all heat exchangers were found overestimated. As a result, the costs of the investment and risk indicators were also misjudged. By adding precise dimensioning of heat exchangers to risk assessment in HEN, we have made it possible to plan HENs more accurately and evaluate their safety more realistically.
Secondary keywords: inherent safety;heat exchanger network;simultaneous synthesis;
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages: XIII, 59 str.
ID: 11218042