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Title:Simulacija in optimiranje organskega Rankinovega cikla za izkoriščanje odpadne toplote pri proizvodnji aluminija : magistrsko delo
Authors:Dokl, Monika (Author)
Čuček, Lidija (Mentor) More about this mentor... New window
Urbancl, Danijela (Co-mentor)
Gomilšek, Rok (Co-mentor)
Files:.pdf MAG_Dokl_Monika_2021.pdf (2,61 MB, This file will be accessible after 08.04.2022)
MD5: 9E14F641CCA9AEAF168AF0E7639B5007
 
Language:Slovenian
Work type:Master's thesis/paper (mb22)
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Proizvodnja aluminija spada med energetsko najintenzivnejše proizvodne procese, saj se med postopkom elektrolize porabi velika količina električne energije. Približno polovica energije, ki se porabi med proizvodnjo, se izgubi kot odpadna toplota. Takšna nizkotemperaturna toplota je primerna za pridobivanje energije, kot je proizvodnja električne energije z organskim Rankinovim ciklom (ORC). V magistrskem delu smo se osredotočili na maksimiranje proizvodnje električne energije in maksimiranje neto sedanje vrednosti (NSV) celotnega sistema. V procesu smo uporabili tri delovne tekočine R245fa, R1234yf in R1234ze ter analizirali ekonomsko uspešnost projekta. Proces smo simulirali s simulatorjem Aspen Plus in optimirali z optimizacijskim programom GAMS. Pri simulaciji smo za organske delovne tekočine in vodo upoštevali termodinamsko metodo REFPROP, medtem ko smo za dimne pline zaradi vsebnosti HF uporabili metodo NRTL. Podatke o odpadnem viru toplote pri proizvodnji aluminija smo dobili iz aluminijeve industrije in podatke o termofizikalnih lastnostih fluidov v bazi podatkov programa Aspen Plus. Z optimiranjem smo določili optimalne delovne parametre, kot so masni in energijski pretoki, tlaki in temperature v procesu ter ocenili ekonomsko uspešnost projekta. V osnovnem modelu smo preučevali vpliv minimalne temperaturne razlike v toplotnih prenosnikih, temperature in pretoka dimnih plinov na maksimalno proizvodnjo električne energije v turbini ter vpliv cene toplote na maksimalno neto sedanjo vrednost. Z optimiranjem smo poiskali optimalno ravnovesje med termodinamskimi in ekonomskimi parametri sistema. Proces z delovno tekočino R245fa lahko s turbino proizvede do 803,35 kW električne energije. Okolju prijaznejši delovni tekočini R1234yf in R1234ze dajeta nižjo proizvodnjo električne energije in manj dobičkonosen sistem. Proces je ekonomsko uspešen le, če poleg proizvodnje električne energije uporabimo toplotno energijo, kjer cena toplote znaša vsaj 0,008 EUR/kWh.
Keywords:proizvodnja aluminija, izkoriščanje odpadne toplote, organski Rankinov cikel, proizvodnja električne energije, optimiranje, neto sedanja vrednost
Year of publishing:2021
Place of performance:Maribor
Publisher:[M. Dokl]
Number of pages:XII, 53 f.
Source:Maribor
UDC:[536.7:620.97]:669.712(043.2)
COBISS_ID:63768835 New window
Views:124
Downloads:0
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:30.03.2021

Secondary language

Language:English
Title:Simulation and optimisation of organic Rankine cycle for waste heat recovery from aluminium production
Abstract:Production of aluminium is among energy most intensive manufacturing processes, especially it consumes significant amounts of electricity during electrolysis process. Around half of the energy consumed during electrolysis is lost as a waste heat. Significant amounts of that heat are wasted from the smelter as flue gas. However, this low-temperature waste heat could easily be accessible for energy recovery, such as for power generation through Organic Rankine Cycle (ORC). The aim of this study is to maximise production of electricity in turbine and to maximise the net present value (NPV) of the system. Three working fluids R245fa, R1234yf and R1234ze are selected, and their thermodynamic and economic performance is compared by simulation in Aspen Plus. For working fluids and water, the thermodynamic method REFPROP is considered, while for the flue gas, NRTL method is considered due to HF present in flue gas. The data regarding waste heat are obtained from aluminium industry, and the data regarding thermophysical properties of fluids are obtained from Aspen Plus. Optimisation is performed with GAMS and enables to determine optimal working parameters, such as flowrates, pressures, temperatures, and energy flows in the cycle. Sensitivity analysis is performed regarding minimum approach temperature, flue gas temperature and flowrate while maximising power output, and regarding price of heat while maximising the NPV. Results show the optimal balance between the thermodynamic and economic parameters of the system. The process with working fluid R245fa can produce up to 803,35 kW of electricity. The more environmentally friendly working fluids R1234yf and R1234ze could produce less electricity and exhibits a less profitable system. The process is economically viable only if in addition to electricity production the thermal energy is used, with the price of heat at least 0,008 EUR/kWh.
Keywords:aluminium production, waste heat recovery, organic Rankine cycle, power generation, optimisation, net present value


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