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Boiling crisis of advanced nuclear fuels
Bírošíková, Martina ; Milčák, Pavel (referee) ; Šnajdárek, Ladislav (advisor)
This diploma thesis deals with a theoretical description of the boiling crisis during intensive heat transfer between the outer surface of the fuel and the coolant and research of the materials and coverage of fuel assemblies with emphasis on the importance of accident tolerant fuel with higher accident resistance. The experimental part ot the work determines the critical heat flux on the examined test sample and interprets the results obtained several times by repeated measurements.
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Circuits of nuclear power plants
Pavlíček, Martin ; Kudela, Libor (referee) ; Milčák, Pavel (advisor)
This bachelor's thesis deals with the history and beginnings of nuclear energy, an explanation of the basic knowledge of nuclear energy and an introduction to the issue. Then, the division of nuclear reactors according to various criteria is described. Furthermore, the solution of individual circuits in a nuclear power plant is described according to the type of reactor used. The individual circuits are described at the Temelin nuclear power plant. The last part deals with nuclear safety and various safety systems, without which a nuclear power plant could not be started.
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Digestate Grate Boiler
Krejčiřík, Jiří ; Milčák, Pavel (referee) ; Lisý, Martin (advisor)
This master thesis deals with the properties of digestate in combustion, design of construction solution of digestate boiler and experimental verification of boiler parameters. The first chapter deals with the properties of digestate as a fuel. It is followed by a chapter dealing with the existing measured results on a similar boiler. This is followed by a stoichiometric calculation of the digestate boiler. The next chapter is devoted to combustion chamber models. This chapter is followed by a chapter with experimental verification of chamber models and combustion process tuning. The last chapter contains design of construction and operational measures.
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Reconstruction of the turbogenerator TG 5 in Opatovice Power Plant
Rak, Vítek ; Milčák, Pavel (referee) ; Kracík, Petr (advisor)
This thesis discusses the reconstruction of the turbogenerator TG5 of the Elektrárny Opatovice and introduces options of technical solutions for power central of combined heat and electricity production. First section describes the differences between back-pressure and condensing turbines. Next section briefly introduces the company Elektrárny Opatovice a.s. with the description of the current back-pressure turbine TG5, which is near end of it life cycle and is to be reconstructed in following years. Based on the technical-economic analysis of the operation of the current TG5, possible benefits of new technical solutions are proposed.
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Design of a combined cycle electricity source
Kadáková, Nina ; Kolat, Pavel (referee) ; Milčák, Pavel (advisor)
A combined cycle is one of the thermal cycles used in thermal power plants. It consists of a combination of a gas and a steam turbine, where the waste heat from the gas turbine is used for steam generation in the heat recovery steam generator. The aim of the diploma thesis was the conceptual design of a combined cycle electricity source and the balance calculation of the cycle. The calculation is based on the thermodynamic properties of the substances and the basic knowledge of the Brayton and Rankin-Clausius cycle. The result is the amount and parameters of air, flue gases, and steam/water in individual places and the technological scheme of the source, in which these parameters are listed.
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Testing of the barrier filter charge for gas cleaning
Muzikářová, Věra ; Milčák, Pavel (referee) ; Baláš, Marek (advisor)
This diploma thesis deals with the issue of pollution of the generated gas during gasification. It consists of two parts. The first part is theoretical, where there is a search describing the course of gasification. There is also an overview of impurities in the generated gas and a description of methods suitable for gas purification. The second part of the work is focused experimentally, where various fillings of the barrier filter are tested during gas cleaning.
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Combustion of a mixture of hydrogen and natural gas in the combustion chambers of boilers and gas turbines
Honzíček, Štěpán ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
Master‘s thesis specifically deals with very current topic of blending (low-emission) hydrogen and natural gas. A key view focus on combustion of a mixture hydrogen and natural gas. Preliminary part describes combustion of fuel gases in general and is followed by a technical search on construction of combustion chambers of boilers and gas turbines. It’s added information about current development and utilization of hydrogen. New projects of hydrogen combustion technologies are also introduced. Practical part shows a calculation of a gas mixture combustion balance in real conditions. It‘s extended by proposal and construction of a blending technology of hydrogen and natural gas with subsequent combustion in an uncooled combustion chamber. Concluding part includes a program for operating states calculating when the variables of introduced technology are changing.
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The Effect of Biomass Storage on the Fuels Parameters
Zlevorová, Tereza ; Milčák, Pavel (referee) ; Lisý, Martin (advisor)
This thesis investigates the effect of storage on the basic properties of fuel. The first part summarises basic knowledge of biomass, its properties, storage methods and related problems. This is followed by an experimental part, which aims to investigate predicted decrease in the calorific value and volatile matter of materials due to spreading degradation. The experiment is based on repeated measuring of the properties of samples stored for thirteen weeks at three different temperatures and moistures. The results are graphs that show a decreasing trend in most cases. They also show differences in the extent and rate of degradation depending on the type of material and the ambient conditions.
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Feasibility Study of Burner of Rotary Chamber
Galková, Kristína ; Milčák, Pavel (referee) ; Lisý, Martin (advisor)
This master's thesis talks about main burners of clinker rotary kiln. The first part is focused on the review of burners designed by main global producers. Description of the burners M.A.S.© and Turbu-Flex™ used in kiln system CEMMAC a.s. is in the next part. The influence of the replacement of M.A.S.© burner by Turbu-Flex™ burner is analysed in the last part of this thesis.
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