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1.
6th International Conference on Technologies & Business Models for Circular Economy : conference proceedings
2024, zbornik

Opis: The 6th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering of the University of Maribor in cooperation with Strategic Research and Innovation Partnership – Networks for the transition into circular economy (SRIP – Circular economy), managed by the Chamber of Commerce and Industry of the Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 6th to September 8th, 2023. TBMCE 2023 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included a round table Standardization for circular economy – more secure and less complicated closing of material loops, 6 panel discussions, 1 plenary and 3 keynote lectures, oral and poster presentations. The event was under the patronage of Ministry of the Economy, Tourism and Sport and Ministry of Cohesion and Regional Development. The Netherlands joined us as a partner country.
Ključne besede: sircular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 26.02.2024; Ogledov: 534; Prenosov: 559
.pdf Celotno besedilo (24,07 MB)
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2.
Food Waste to Energy through Innovative Coupling of CHP and Heat Pump
Jan Drofenik, Danijela Urbancl, Darko Goričanec, Zdravko Kravanja, Zorka Novak-Pintarič, 2023, izvirni znanstveni članek

Opis: This paper presents the conceptual design of a technological solution for the efficient conversion of food waste into heat and power. The distribution and composition of food loss and waste at different stages of the food supply chain in Slovenia and their potential for biogas production were determined. It was found that more than 50% of food waste comes from households. Therefore, a small plant was designed to convert food waste into biogas, which was innovatively coupled with a combined heat and power (CHP) unit and a heat pump. This doubles the amount of heat generated compared to conventional cogeneration. Based on the capacity of a micro commercial CHP unit, 3330 households (about 8000 residents) would supply food waste. The heat generated could replace 5% of the natural gas used for domestic water heating. The payback period would be 7.2 years at a heat price of about 80 EUR/MWh, however, for municipalities with more than 40,000 inhabitants the payback period would be reduced to less than 3 years. The cost price of the heat generated by this system would be about 25 EUR/MWh, taking into account the government subsidy for the operation of the CHP unit.
Ključne besede: food waste to energy, biogas, combined heat and power, CHP, heat pump, efficiency, conceptual design, preliminary economic assessment, sensitivity analysis
Objavljeno v DKUM: 16.02.2024; Ogledov: 3135; Prenosov: 15
.pdf Celotno besedilo (19,44 MB)
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3.
Sinteza trajnostnih in regenerativnih oskrbovalnih mrež na osnovi matematičnega programiranja za postopno doseganje ogljične nevtralnosti : doktorska disertacija
Sanja Potrč, 2023, doktorska disertacija

Opis: Blaženje podnebnih sprememb je eden največjih izzivov sodobne družbe, ki je tesno povezan z vprašanjem energetskega sistema v prihodnosti. Zaradi vse večjega povpraševanja po energiji in s tem povezanega vpliva na okolje in človeštvo je potrebno preoblikovanje energetskega sistema in nadaljnji razvoj v smeri učinkovitejše proizvodnje, dobave in rabe energije. Sedanji ukrepi za doseganje ogljične nevtralnosti in omejitve globalnega segrevanja pod 2 °C glede na predindustrijsko raven so prepočasni in nezadostni, zato bodo za dosego tega cilja potrebna velika prizadevanja na globalni ravni. Proizvodne sisteme je treba sintetizirati v smeri trajnostnega in regenerativnega razvoja, da bodo prilagodljivi na podnebne spremembe in uravnoteženi ter da bodo ohranjali biotsko raznovrstnost za zadovoljitev potreb človeštva v prihodnosti z ohranjanjem celovitosti narave. V doktorski disertaciji prikazujemo razvito metodologijo za celovito sintezo in optimizacijo obsežnih energetskih, (bio)kemijskih in kmetijskih oskrbovalnih mrež za prehod na trajnostni energetski sistem in postopno doseganje ogljične nevtralnosti v Evropski uniji do leta 2050. Hkratno reševanje teh sistemov je možno le z uporabo pristopa matematičnega programiranja, ki zagotavlja tudi dopustnost optimalnih rezultatov za dani niz pogojev. Sinteza takšnih obsežnih oskrbovalnih mrež vsebuje ogromno število zelo kompleksnih interakcij, zato smo pri modeliranju uporabili številne tehnike za zmanjšanje velikosti modela in učinkovite dekompozicijske tehnike. Razvili smo metodologijo za dinamično sintezo oskrbovalnih mrež z biogorivi, električno energijo in toploto iz obnovljivih virov energije ob upoštevanju vseh treh stebrov trajnostnega razvoja – ekonomskega, okoljskega in socialnega. Za povečanje učinkovitosti prihodnjega energetskega sistema in izkoriščanja sinergističnih učinkov povezovanja med sektorji smo matematični model dodelali z medsektorsko integracijo in vključitvijo tako kratkoročnih kot dolgoročnih hranilnikov energije. Doktorska disertacija prikazuje tudi razvoj koncepta regenerativnih oskrbovalnih mrež za postopen prehod na samoobnovitveni (regenerativni) energetski sistem in doseganje letnih negativnih neto emisij oziroma preseganje ogljične nevtralnosti. V ta namen smo razvili napovedovalni model za določanje samoobnovitvene zmožnosti Zemlje glede zajemanja CO2 in koncentracije CO2 v atmosferi. Rezultati optimizacije oskrbovalnih mrež z biogorivi kažejo, da bi z dodatno proizvodnjo biogoriv lahko že do leta 2030 dosegli bistveno večji delež obnovljivih virov energije v prometu, kot je cilj direktive EU, vendar bo za konkurenčnost proizvodnje biogoriv v nekaterih državah ključnega pomena, da bodo podjetja prejela dodatne subvencije. Ugotovili smo tudi, da optimizacija oskrbovalnih mrež na širši, kontinentalni ravni, privede do bistveno boljše trajnostne in ekonomske neto sedanje vrednosti kot v primeru optimizacije na ravni posameznih držav. Rezultati prav tako kažejo, da bo imela medsektorska integracija, predvsem elektrifikacija prometnega in stanovanjskega sektorja ter storitvenih dejavnosti, velik vpliv na izboljšanje učinkovitosti sistema in pospešitev prehoda na trajnostno energetsko prihodnost. Prav tako je pri načrtovanju prihodnjega energetskega sistema pomembno, da ne stremimo le k doseganju ogljične nevtralnosti, temveč k regenerativnemu energetskemu sistemu z negativnimi neto letnimi emisijami, sicer koncentracija CO2 v atmosferi ne bo začela padati, povprečna temperatura pa bo še naprej naraščala. Dobljeni rezultati predstavljajo celoten energetski prehod z izbiro ustreznih tehnologij, lokacij in surovin za doseganje regenerativnega energetskega sistema, ki je sposoben samoobnavljanja. Razvoj novih konceptov in metodologij za sintezo in optimizacijo širših sistemov trajnostnih in regenerativnih oskrbovalnih mrež na osnovi matematičnega programiranja je zelo pomemben za načrtovanje prihodnjega proizvodnega in energetskega sistema.
Ključne besede: matematično programiranje, oskrbovalne mreže, sinteza oskrbovalnih mrež, trajnostni razvoj, regenerativni razvoj, energetski prehod, ogljična nevtralnost
Objavljeno v DKUM: 11.10.2023; Ogledov: 472; Prenosov: 101
.pdf Celotno besedilo (11,23 MB)

4.
6th International Conference on Technologies & Business Models for Circular Economy : book of abstracts
2023

Opis: The 6th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy), managed by the Chamber of Commerce and Industry of Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 6th to September 8th, 2023. The Netherlands joined us as a partner country of the conference. TBMCE 2023 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. Panel discussions addressed following topics: Capture, storage or conversion of CO2 or H2?, The potential of small scale biorefining, Circular economy in construction – myth or real opportunity?, Importance of circular communities in international arena, Sector Coupling: pathways to integrated energy systems, Combating water pollution by plastic waste. The event was
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 01.09.2023; Ogledov: 421; Prenosov: 45
.pdf Celotno besedilo (3,06 MB)
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5.
Editorial: combined water and heat integration in the process industries
Elvis Ahmetović, Ignacio E. Grossmann, Zdravko Kravanja, François Marechal, Jiri Klemeš, Luciana E. Savulescu, Dong Hongguang, 2022, predgovor, uvodnik, spremna beseda

Opis: Water and energy are resources that are used in large quantities in different sectors (domestic, agricultural, and industrial). Based on data on global water and energy consumption in the world over the recent past, as well as forecasts for the coming years, a continuous trend of increasing water and energy consumption can be observed. ...
Ključne besede: water integration, heat integration, systematic methods, pinch analysis, mathematical programming, heat-integrated water networks, optimisation, process industry
Objavljeno v DKUM: 18.08.2023; Ogledov: 354; Prenosov: 24
.pdf Celotno besedilo (505,83 KB)
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6.
Recovery of N-butanol from a complex five-component reactive azeotropic mixture
Miloš Bogataj, Zdravko Kravanja, Andreja Nemet, 2022, izvirni znanstveni članek

Opis: This paper proposes a concept of a process design for the separation and recovery of n-butanol from a five-component mixture, consisting of n-butanol, isobutanol, formaldehyde, water and methanol. The mixture is a common waste stream in the production of butylated amino resins; therefore, recovery of n-butanol is crucial to the efficiency of the process. The results show that up to 94% of the n-butanol present in the waste stream can be recovered. Under the studied conditions, 99.76% pure n-butanol can be obtained, while formaldehyde, water and methanol are present only in traces. The energy intensity of the process is estimated at 2.42 MJ/kg of purified n-butanol. The economic analysis of the process shows that the process is economically viable over a wide range of production capacities, as evidenced by high net present values and high return on investment values.
Ključne besede: recycling, n-butanol, azeotropic mixture, separation, process design, energy efficiency
Objavljeno v DKUM: 17.08.2023; Ogledov: 267; Prenosov: 27
.pdf Celotno besedilo (4,40 MB)
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7.
Primerjava zaporedne in simultane sinteze toplotno integriranih vodnih omrežij : magistrsko delo
Nikolina Cetin, 2023, magistrsko delo

Opis: V magistrskem delu smo primerjali dva pristopa pridobivanja toplotno integriranega vodnega omrežja. Prvi pristop je bil zaporedni pristop, katerega smo zasnovali s konstrukcijo vodnega omrežja v prvem koraku s pomočjo nelinearnega programiranja (NLP). Na podlagi pridobljenega vodnega omrežja smo sestavili niz različnih možnih toplotnih tokov, glede na možnosti mešanja tokov. Na podlagi pridobljenih tokov smo izvedli različne primere toplotne integracije s pomočjo mešano celoštevilskega nelinearnega programiranja (MINLP) in modela Synheat ter primerjali njihove skupne letne stroške. Drugi pristop je bil simultani pristop, kjer smo hkrati optimirali celotno toplotno integrirano vodno omrežje s pomočjo mešano celoštevilskega nelinearnega programiranja (MINLP). V obeh pristopih je bila namenska funkcija definirana kot minimiranje skupnih letnih stroškov toplotno integriranega vodnega omrežja. Pri zaporednem pristopu smo obravnavali štiri različne primere pridobivanja toplotnih tokov. Rešitev je bila toplotno integrirano vodno omrežje. Omrežje, ki je po optimizaciji doseglo najnižje skupne letne stroške (TAC) smo nato primerjali z rešitvijo simultanega omrežja. Pri primerjavi smo se osredotočili na postavitev omrežja, tokove, ki so določeni, količino izmenjane oz. oddane toplote, potrebne velikosti prenosnikov in grelcev ter investicijo in obratovalne stroške. Ugotovili smo, da simultani pristop zagotavlja nižje skupne letne stroške toplotno integriranega vodnega omrežja, saj omogoča optimalno razmerje cepitve tokov za zmanjšane površine prenosnikov, česar pri zaporednem pristopu ne moremo napovedati, saj obstaja neskončno mnogo možnosti za razmerje cepitve tokov.
Ključne besede: vodna omrežja, toplotna integracija, toplotno integrirana vodna omrežja, zaporedna sinteza, simultana sinteza, matematično programiranje
Objavljeno v DKUM: 03.04.2023; Ogledov: 483; Prenosov: 57
.pdf Celotno besedilo (1,92 MB)

8.
5th International Conference on Technologies & Business Models for Circular Economy : Conference Proceedings
2023

Opis: The 5th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in cooperation with the Chamber of Commerce and Industry of Štajerska and SRIP- Circular Economy. The conference was held in Portorož, Slovenia, at the Grand Hotel Portorož from September 12th to September 14th, 2022. TBMCE 2022 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included a round table: Asia – factory of the world, what about the EU?, 4 panel discussions, 1 plenary and 4 keynote lectures, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the honorary patronage of Mr. Matjaž Han, Minister of Economic Development and Technology.
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 30.01.2023; Ogledov: 625; Prenosov: 36
.pdf Celotno besedilo (4,86 MB)
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9.
5th International Conference on Technologies & Business Models for Circular Economy, [September 12th to September 14th 2022, Portorož, Slovenia] : Book of Abstracts
2022

Opis: The 5th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy) and Chamber of Commerce and Industry of Štajerska. The conference was held in Portorož, Slovenia, at the Grand Hotel Portorož from September 12th to September 14th, 2022. TBMCE 2022 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the patronage of Ministry of Economic Development and Technology.
Ključne besede: circular economy, sustainable development, processes and technologies, circular business models, research and development
Objavljeno v DKUM: 09.09.2022; Ogledov: 547; Prenosov: 99
.pdf Celotno besedilo (5,09 MB)
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10.
4th International Conference on Technologies & Business Models for Circular Economy, [September 13th to September 15th 2021, Portorož, Slovenia] : conference proceedings
2022

Opis: The 4th International Conference on Technologies & Business Models for Circular Economy (TBMCE) was organized by the Faculty of Chemistry and Chemical Engineering, University of Maribor in collaboration with the Strategic Research and Innovation Partnership - Networks for the Transition into Circular Economy (SRIP- Circular Economy). The conference was held in Portorož, Slovenia, at the Grand Hotel Bernardin from September 13th to September 15th, 2021. TBMCE 2021 was devoted to presentations of circular economy concepts, technologies and methodologies that contribute to the shift of business entities and society as a whole to a more responsible, circular management of resources. The conference program included panel discussions, plenary and keynote sessions, oral and poster presentations on the following topics: Sustainable energy, Biomass and alternative raw materials, Circular business models, Secondary raw materials and functional materials, ICT in Circular Economy, Processes and technologies. The event was under the patronage of Ministry of Economic Development and Technology.
Ključne besede: krožno gospodarstvo, trajnostni razvoj, procesi in tehnologije, krožni poslovni modeli, raziskave in razvoj
Objavljeno v DKUM: 30.05.2022; Ogledov: 869; Prenosov: 66
.pdf Celotno besedilo (2,67 MB)
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