Napredni procesi zgorevanja inovativnih goriv v motorjih z notranjim zgorevanjem

Trček, Klemen (author), Katrašnik, Tomaž (mentor)

Napredni zgorevalni procesi oziroma nizkotemperaturni zgorevalni procesi omogočajo doseganje nižjih izpustov dušikovih oksidov (NOx) in trdnih delcev (PM) v primerjavi s konvencionalnimi zgorevalnimi procesi ob primerljivih izkoristkih motorja. K nižjim izpustom ogljikovega dioksida (CO2) lahko dodatno pripomore uporaba primernih alternativnih goriv z visokim razmerjem števila atomov H:C. V nizkotemperaturnih zgorevalnih procesih z visoko stopnjo homogenizacije delovne zmesi, so najbolj raziskani kompresijski vžig homogene delovne zmesi (HCCI), kompresijski vžig delno homogenizirane delovne zmesi (PPCI) in kompresijski vžig delovne zmesi nadzorovan z reaktivnostjo le-te (RCCI), izmed katerih je slednji predmet analiz v diplomskem delu. Za RCCI proces zgorevanja je raziskan vpliv spreminjanja časa začetka vbrizga mešanice hidrogeniranega rastlinskega olja in bencina (HVO/b) v razmerju 75 %/25 %, temperature v polnilnem zbiralniku in deleža recirkuliranih izpušnih plinov (EGR) na izpuste onesnažil, termodinamske parametre in indicirani izkoristek motorja. Doseženi izpusti PM so vselej bistveno nižji od izpustov osnovnega dizelskega motorja, krmiljenega z originalno elektronsko krmilno enoto. Zgodnji vbrizg HVO/b ugodno vpliva na znižanje izpusta NOx in višanje izkoristka, vendar poviša izpuste heksana (HC6) in ogljikovega monoksida (CO). EGR se je izkazal kot primeren sistem za nadzor izpustov NOx in zakasnitve zgorevanja. Enak vpliv na periodo zgorevanja in izpuste NOx je opazen tudi pri nižanju temperature v polnilnem zbiralniku.

• Language: Slovenian
• Keywords: Motorji z notranjim zgorevanjem, napredni procesi zgorevanja, alternativna goriva, izpusti onesnažil, termodinamski parametri
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [K. Trček]
• Year: 2019
• Number of pages: XXII, 60 str.
• PID: 20.500.12556/RUL-107680
• UDC: 621.43.068(043.2)
• COBISS.SI-ID: 16632603
• Publication date in RUL: 12.05.2019

TRČEK, Klemen, 2019, Napredni procesi zgorevanja inovativnih goriv v motorjih z notranjim zgorevanjem [online]. Bachelor’s thesis. Ljubljana : K. Trček. [Accessed 27 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=107680

Secondary language

• Language: English
• Title: Advanced combustion process of innovative fuels in internal combustion engines

Abstract

Advanced combustion processes or low temperature combustion processes make it possible to achieve lower nitrogen oxide (NOx) and particulate matter (PM) emissions in comparison to conventional combustion processes with comparable engine efficiency. The use of suitable alternative fuels with a high ratio of H:C number of atoms contributes to lower carbon dioxide (CO2) emissions. In low temperature combustion processes with high homogenization level of the working mixture, the most researched are Homogeneous Charge Compression Ignition (HCCI), Partially Premixed Compression Ignition (PPCI) and Reactivity Controlled Compression Ignition (RCCI), of which the latter being analyzed in this diploma work. For RCCI combustion process, the influence of changing injection timing of the hydrotreated vegetable oil and petrol mixture (HVO/b) in 75 %/25 % ratio, temperature in intake manifold and the exhaust gas recirculation (EGR) fraction on pollutant emissions, various thermodynamic parameters and engine efficiency were investigated. Achieved PM emissions are always significantly lower compared to basic Diesel engine controlled by the original engine control unit. Early injection of HVO/b has beneficial influence on reducing NOx emissions and raising engine efficiency, but raises hexane (HC6) and carbon monoxide (CO) emissions. EGR has proven as a suitable system to control NOx emissions and combustion delay. The same effect on the combustion period and NOx emissions is also noticable when the temperature in the intake manifold is lowered.

• Keywords: Internal combustion engines, advanced combustion processes, alternative fuels, pollutant emissions, thermodynamic parameters