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Abstract: V diplomskem delu je predstavljeno delovanje trenutno največjega sistema v boju s podnebno krizo na svetu – EU-sistem trgovanja z emisijami (EU ETS). Na začetku diplomskega dela so prestavljene prvotna zasnova sistema trgovanja s certifikati CO2 in pomanjkljivosti, ki so bile odpravljene v nadaljnjih letih delovanja sistema. V diplomskem delu so opisani razvoj sistema in posledice, ki so bile povod za spreminjanje energetske podobe Slovenije in Evrope. Predstavljeni so tudi izračuni, po katerih se določajo izpusti emisij toplogrednih plinov, in monitoring emisij v realnem času.
Keywords: emisijski kupon, toplogredni plini, obnovljivi viri energije, ogljična nevtralnost
Published in DKUM: 01.04.2022; Views: 1155; Downloads: 89
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Abstract: Diplomsko delo proučuje razvoj vetrne energije v Sloveniji in po svetu. Predstavi problematiko nizkih vrednosti inštaliranih moči in proizvodnje električne energije iz vetrnih elektrarn v Sloveniji. Primerjava je narejena z drugimi evropskimi državami, ki vlagajo ogromna sredstva v vetrno energijo in nas postavljajo na dno lestvice pri omenjenem viru proizvodnje električne energije. Diplomsko delo predstavi prvega investitorja in očeta prve vetrnice v Sloveniji ter vse težave, ki spremljajo realizacijo podobnega projekta. Skozi prikazane tabele in grafe, ki prikazujejo minule projekte in projekte v prihodnosti, v prihodnost ne moremo zreti optimistično, saj bo naš položaj, kar se tiče vetrne energije, dokler ne spremenimo zakonodaje in se približamo investitorjem, na repu EU. Prav tako v diplomskem delu obravnavamo zaveze OVE s strani EU. V tabelah je razvidno, v katerih sektorjih cilj izpolnjujemo in v katerih ga še ne dosegamo. Glede na visoke zahteve, ki so bile v zavezi sprejete, bodo potrebna velika vlaganja in subvencije s strani države, da izpolnimo zastavljene cilje OVE, predvsem slediti optimističnemu cilju, da do konca leta 2030 vse države EU dosežejo vsaj 32-odstotni delež iz OVE v bruto končni rabi energije.
Keywords: električna energija, obnovljivi viri, vetrne elektrarne, proizvodnja električne energije, podporna shema
Published in DKUM: 01.12.2021; Views: 1268; Downloads: 159
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Abstract: With in-depth geomechanical analyses of sub-level mining using the longwall mining method we can identify the relationships between the physical and mechanical parameters of geological materials, depending on the intensity of the coal extraction. The extent and the intensity of the mining operations impose impacts on the stresses and cause deformation changes in the rocks and in the coal seams on a broader area of excavations. The method of sub-level coal extraction requires multi-caving of the hanging-wall layers, which are recompressed, and in sub-level stoping each represents a hanging wall. The repeating processes of caving-in and compression, from the aspect of the theory of plasticity, have been relatively little researched because every such process brings about structural changes in natural, multi-caved and recompressed materials in the hanging wall. The intensity of the coal extraction has direct impacts on the surrounding and distant mining areas. Extensive stress and deformation changes in the surrounding area, and in the mine, represent a safety hazard for the employees, since the supporting system in the mine roadway could collapse. Therefore, a controlled excavation of the coal, and a good understanding of the geomechanical properties of all the materials and processes involved, is extremely important for planning and managing economic production, while also ensuring safe mining operations. A numerical model that allows for in-depth analyses of the geomechanical processes that occur in the hanging wall, the footwall and in the coal seam during sub-level coal excavation, is broadly applicable and highly relevant for analysing the intensity and the level of the caving processes in sub-level coal mining, and for making realistic plans for coal excavation with workers’ safety in mind.
Keywords: coal mining, sub-level mining method, longwall coal mining method, carving processes, finite-difference method, FLAC, mathematical model
Published in DKUM: 11.06.2018; Views: 1117; Downloads: 96
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Abstract: Underground coal gasification (UCG) is a viable possibility for the exploitation of vast coal deposits that are unreachable by conventional mining and can meet the energy, economic and environmental demands of the 21st century. Due to the complexity of the process, and the site-specific coal and seam properties, it is important to acknowledge all the available data and past experiences, in order to conduct a successful UCG operation. Slovenia has huge unmined reserves of coal, and therefore offers the possibility of an alternative use of this domestic primary energy source. According to the available underground coal gasification technology, the energy and economic assessment for the exploitation of coal to generate electricity and heat was made. A new procedure for the estimation of the energy efficiency of the coal gasification process, which is also used to compare the energy analyses for different examples of coal exploitation, was proposed, as well as the technological schemes and plant operating mode in Velenje, and the use of produced synthetic coal gas (syngas). The proposed location for the pilot demonstration experiment in Velenje Coal Mine was reviewed and the viability of the underground coal gasification project in Velenje was determined.
Keywords: underground coal gasification, syngas, clean coal technology, energy analysis, economic analysis
Published in DKUM: 31.08.2017; Views: 2891; Downloads: 459
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Abstract: V zaključnem delu so kratko predstavljeni primarni viri. Navedeni so njihovi krajši opisi, ter prednosti in slabosti. Poudarek diplomske dela pa bazira na njihovih cenah, ki veljajo v Sloveniji in svetu. Prav tako je predstavljeno gibanje teh cen na svetovnih trgih. V sklepnem delu naloge je predstavljen strošek ogrevanja z različnimi energenti in strošek ogrevanje naše domače hiše v prejšnji zimi.
Keywords: cene, energenti, primarni viri, Slovenija, svet
Published in DKUM: 22.10.2015; Views: 1833; Downloads: 182
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