Numerično modeliranje procesa sušenja blata iz čistilnih naprav

Mihailovski, Pavel (author), Hočevar, Marko (mentor)

Sušenje je proces odstranjevanja vlage iz mokrih snovi, s ciljem pridobivanja suhe trdne snovi. Odstranitev hlapne snovi je posledica prenosa toplote in mase med sušilnim medijem, najpogostejše zrak, in površino mokre trdne snovi. Organska blata imajo kompleksno porozno strukturo, ki je bila v našem primeru modelirana kot tekoča domena. Prenos energije med sušenjem in površino trdne snovi je bil poenostavljen z upoštevanjem toplotnega ravnovesja med sušilnim medijem in trdno snovjo. Temperaturni gradient, ki je bil razvit vzdolž višine blata, je bil posledica nastavljenega energijskega ponora. Postopek sušenja se nato simulira z metodami dinamike računalniške tekočine (RDT). Parametri sušilnega zraka, definirani kot robne pogoje področja tekočine komor, so bili ključnega pomena pri izvedbi numerične simulacije. Robni pogoji, določeni na vstopih in izhodih komore, skupaj z našim modelom porozne strukture blata, so bili ključni dejavniki in so neposredno vplivali na točnost našega modela. Za določitev ustreznih robnih pogojev in pogojev modela porozne strukture, ki naj bi čim natančneje popisali procesa sušenja, smo uporabili pridobljene eksperimentalne rezultate. Glavni cilj teze je bil razvoj modela porozne strukture, ki bo čim bolj natančno reproduciral eksperimentalno izmerjenimi rezultati procesa sušenja.

• Language: Slovenian
• Keywords: sušenje blato porozen material numerična simulacija računalniška dinamika tekočin
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [P. Mihailovskig
• Year: 2018
• Number of pages: XX, 75 str.
• PID: 20.500.12556/RUL-101661
• UDC: 004.942:519.876.5:628.32(043.2)
• COBISS.SI-ID: 16135451
• Publication date in RUL: 24.06.2018

MIHAILOVSKI, Pavel, 2018, Numerično modeliranje procesa sušenja blata iz čistilnih naprav [online]. Master’s thesis. Ljubljana : P. Mihailovskig. [Accessed 31 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=101661

Secondary language

• Language: English
• Title: Numerical modeling of the process of drying of sewage sludge

Abstract

Drying is the process of removing volatile matter, mostly moisture, from wet solid materials. The removal of the volatile substance is a consequence of heat and mass transfer between the drying medium, most often air, and the surface of the wet solid. Organic sludges have a complex porous structure, which in our case, was modeled as a liquid domain. The energy transfer between the drying medium and the surface of the solid was simplified by taking into account the thermal equilibrium between the drying medium and the solid. The temperature gradient developed through the modeled sludge is the result of a set energy sink. The drying process is then simulated using computer fluid dynamics (RDT) methods. The parameters of the drying air are of great importance for the implementation of numerical simulations. The parameters of the drying air represent the boundary conditions of the chambers fluid domain. The boundary conditions set at the inlets and outlets of the chamber, together with our model of the sludges porous zone were of crucial importance with regards to the accuracy of our model. For the purpose of determining the appropriate boundary conditions, the obtained experimental results were used. The main goal of this master thesis was the development of a model of a porous structure that will match the experimental results as accurately as possible.

• Keywords: drying sludge porous material numerical simulation computational fluid dynamics