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The use of nitrous oxide to increase the performance parameters of an SI engine
Dobeš, Tomáš ; Bazala, Jiří (referee) ; Beran, Martin (advisor)
This scientific article focuses on the use of nitrous oxide as an additive to fuel for improving the performance parameters of a spark-ignition engine. The results of experiments show that adding nitrous oxide to the fuel-air mixture can improve combustion and thus the performance of the engine. The benefits include increased power, reduced nitrogen oxide emissions, and improved combustion efficiency. However, it is also necessary to consider possible negative effects, such as increased nitrogen oxide formation at high temperatures. Overall, the use of nitrous oxide as an additive to fuel can bring significant improvements in the performance of a spark-ignition engine if used with caution and in accordance with relevant standards and guidelines
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Possibilities of using biomass for home heating
Jurák, Matúš ; Linda, Jakub (referee) ; Lachman, Jakub (advisor)
This bachelor thesis deals with pellets and agropellets and their combustion, where main attention is given to emissions and their efficiency. Thesis consists of two parts. First part is theoretical, which consists of shown types of biomass, their properties and emissions created during combustion. The second part is experimental and its task is to compare efficiency and emissions created during combustion
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Hydrogen as a fuel in combustion processes
Friedel, Petr ; Brummer, Vladimír (referee) ; Vondál, Jiří (advisor)
First part of the bachelor’s thesis is focused on hydrogen as a fuel. Research was made from basic information about hydrogen, manufacturing processes, problems during storing and transporting. Another part of the research is focused on usage of hydrogen in energetics especially in combustion processes. Second part of the thesis describes modelling of chemical reactions. In this part is also composing software for chemical kinetics simulations. Combustion process of hydrogen and fuels enriched by hydrogen is simulated and described by this software.
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Refuse Derived Fuel
Exnerová, Anežka ; Kalivodová, Markéta (referee) ; Lachman, Jakub (advisor)
This bachelor’s thesis deals with the Waste-to-Energy topic focusing on refuse derived fuels. The aim of the first part is to describe what refuse derived fuels are, what are their properties and composition. From this point of view, we determine a comparison with municipal solid waste. Second part is about production process. Possible parameters of refuse derived fuels and the technological process of mechanical-biological treatment are presented here. Following part is focused on fuel combustion. This chapter lists combustion plants and emissions from the incineration of waste and refuse derived fuel.
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HCCI engines
Otáhalík, Pavel ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the problematics of HCCI engines. Due to later required knowledge of fundamental principles, the beginning of the thesis is devoted to the history of combustion engines, the principle of their function and their division by basic criteria. The following section consists of the description of petrol and diesel engines in terms of the principle of the mixture formation and its combustion with emphasis on their advantages and disadvantages. In the central part of the thesis, which focuses on the HCCI engines, various mixtures creation methods and ignition are described. Next, the HCCI engines are described in terms of emissions including current concepts solutions. Finally, the conclusion of the thesis consists of speculation of the future of combustion engines and their prospective alternatives.
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Engines with HCCI mode
Janečková, Radka ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
This bachelor thesis focuses on the ways of realization of engines working in HCCI mode. There are at first described conventional methods of mixture preparation and combustion in spark ignition and compression ignition engines for better classification and understanding. The rest of the thesis is about HCCI engines. These engines are classified into two main categories: gasoline and diesel. There are described several concepts of gasoline and diesel HCCI engines. For each concept there is a basic characteristic and mainly its benefits of emissions and consumption.
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Alternative fuels for SI engines
Balažovič, Lukáš ; Ušiak, Michal (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the topic of alternative fuels for petrol engines. The first is a brief introduction to the issue of petrol engines, followed by a description of each alternative fuel. The thesis summarizes the most important information and comparison of alternatives with conventional gasoline is made. Each fuel is evaluated in terms of advantages, disadvantages, and position on the market.
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Feasibity study of biofuels sources
Zemach, Vít ; Baláš, Marek (referee) ; Lisý, Martin (advisor)
Technical-economical study of biofuel cultivation is the topic of this diploma thesis. This is a study that includes the technology of growing biomass and its subsequent treatment. Part of the work is an economic and sensitivity analysis, which aims to determine the price of produced biomass. This work focuses on herbal biofuels and their comparison with other types of fuels.
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Impact of Operation Parameters on Fine Combustion Particles Concentration in the Flue Gas of Biomass Boilers
Poláčik, Ján ; Masaryk, Michal (referee) ; Adamec, Vladimír (referee) ; Pospíšil, Jiří (advisor)
This work deals with the impact of operating parameters on fine combustion particles formation in the flue gas of biomass combustion device. The research part of the work describes the properties of fine particles, its basic division, impact on human health and the environment. The basic knowledge of the influence of biomass combustion process on fine particles production up to 1 µm in size is summarized. The main part describes the experimental setup for evaluating the size distribution of fine particles. The following section describes the experimental setup with measured results for various combustion parameters in laboratory combustion, automatic boilers, as well as in the manual wood-burning combustion device. The main parameters which were tested were combustion temperature, oxygen amount, type of fuel and geometry of the burned biomass. The impact of individual parameters on the formation of the fine particles is evaluated. The final part of the thesis summarizes the ways in which it is possible to significantly influence the emissions of fine particles by the appropriate choice of combustion operating parameters.
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