Research on biodiesel and hydrogen co-combustion process in compression ignition engine

Romualdas Juknelevičius

Doctoral dissertation

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Increasing environmental pollution, concerns about oil price, traffic related health effects and depletion of fossil fuel resources are forcing humanity to limit the consumption or to look for new forms of energy. The cleanest power suitable for the road transport would be the electric energy produced of the clean sources such as solar, hydro, wind power and stored in batteries or extracted from hydrogen using fuel cell technology. However, the limitted range of driven distance are the obstacle for today battery electric cars. The lack of hydrogen fuelling stations, high price of hydrogen and expensive materials, limits the outbreake of the fuel cell technology. According to experts, hybrid systems including both electric and internal combustion engines consuming the renewable fuels would be the main power plant of vehicles decreasing the exhaust emissions of the internal combustion engine remains the important research subject for the time beeing.

This dissertation work presents the study of performance, efficiency and ecological indicators of the co-combustion process of hydrogen with various renewable biomass based biofuels and their blends in the compression ignition engine. Experimental investigation and numerical simulation methods were applied in order to have a complex understanding of biodiesel fuels and influence of hydrogen on the engine work cycle.

Introductory chapter presents the formulation of the problem, object and importance of the thesis, aim and the tasks of the work. The scientific novelty, theoretical and practical value of results obtained during experiments, and the list of published scientific publications by the author are presented.

The scientific literature according to the theme of the thesis overviewed in the first chapter. The composition of biomass based biofuels with transestherification and hydrotreatening processes, heating values of the fuel and other features were reviewed according to other scientist’s works. The influence of the main parameters on CI engine efficiency and emission parameters were discussed.

The second chapter represents the set-up of engines used at experiment, its methodology, calculations of heating values of the fuel mixtures used in experiment, calculations of hydrogen energy share according to the biodiesel flow rate, calculation of mass fraction burned, theoretical analysis of the rate of heat release, numerical simulation of performed experiments are discussed.

The results of experiments obtained during tests of biodiesel and hydrogen fuel mixtures, numerical analysis and simulation of mentioned fuel mixtures presented in the third chapter. Research of various hydrogen energy share revealed that, higher engine efficiency and lower exhaust gas emissions in CI engine can be achieved.

11 scientific papers focused on the subject of the doctoral thesis have been published: 2 – in publications of the Clarivate Analytics Web of Science database with citation index; 1 – in Conference Proceedings publications of the Clarivate Analytics Web of Science database; 5 – in publications of other international database; 3 – in publications of other reviewable scientific publications.

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145×205 mm
164 p.
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