Investigation on the characteristics of diesel engine running on microalgal oil

Mantas Felneris

Doctoral dissertation

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Microalgae is outstanding among all the types of biomass sources in its ability to respond to the challenges of the future in terms of availability, high growth and production rates, yield per unit area, not competing for arable land, being most suitable optimal source for liquid biofuels and valuable co-products within biorefineries. The author of the thesis has raised the concern regarding the mass usage of fossil fuels in the transport sector by offering to replace the part of diesel fuel with a biofuel produced from microalgae specie P.moriformis. Accordingly, this work was dedicated to thorough analysis of microalgae oil starting with detailed economical analysis of fuel production, the combustion process simulation of the engine, followed by investigation of physico-chemical characteristics of unary and binary oxygenated fuels, and finalizing with detailed research into the exploitational and environmental characteristics of diesel engine running at different load conditions, advanced and retarded fuel injection timings, and deactivated /activated exhaust gas recirculation valve.

The dissertation consists of the introduction, three chapters, general conclusions, reference list and annexes.

The problematic was formulated, the relevance of the work and the aim of the research are discussed in the Introductory part. The research methodology and work tasks have been defined, identifying scientific novelty and significance of the work. Furthermore, the reader is introduced with the structure of dissertation and the list of publications by the author on the proposed topic.

The first chapter allows the reader to look at the Lithuanian transport sector and its transition towards sustainable mobility, assessing changes in air pollution. The potential of microalgae for biofuel production, the importance of process engineering and the search for various synergies for efficiency. Investigations on compression ignition engines made by researchers when pure vegetable oils and their blends with mineral diesel were used are reviewed. The second chapter describes the research methodology, equipment used during the research, the progress of experiments, the results of fuel thermal analysis and the calculation of errors. In the third chapter the results of experimental studies are presented, that includes: numerical modeling analysis of microalgae oil combustion process in cylinders of diesel engine; Changes in energy and ecological parameters of the laboratory engine depending on the load characteristics, The impact of advancement and /or retardation of regulating characteristics on the energy and ecological parameters of diesel engine; External speed characteristic of the engine running on a microalgae oil and its blend with diesel fuel.

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172 p.
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