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Reduction of nitrogen oxides in flue gas on special catalysts
Vávra, Jan ; Krejčí, Tomáš (referee) ; Jecha, David (advisor)
The diploma thesis is focused on experimental reduction of nitrogen oxides on special catalysts. The latest and state-of-the-art flue gas cleaning technologies are used. Selective catalytic reduction results in the desired level of pollution. It is necessary to meet the prescribed emission limit. A ceramic honeycomb filter based on vanadium and titanium is used as the catalyst. The entire measurement is carried out on the experimental INTEQ II unit, which is installed in the flue gas cleaning laboratory at NETME Center. It is shown which operating parameters achieve better efficiency of flue gas cleaning. Comparison of the BASF and CERAM catalysts is also performed. Finally, a material balance of the system is performed and a new external electric heater is designed to accelerate the heating process.
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Reconstruction of overhead power lines 110 kV
Krejčí, Tomáš ; Vašíček, Martin (referee) ; Lázničková, Ilona (advisor)
The master’s thesis deals with the topic new isolation lines of 110 kV. The aim is to propose new insulator hangers. The first, theoretical part focuses on the development of insulators, cutting and possibilities of application. They are the different materials that are used for the production of insulators HV, advantages and disadvantages long rod and cap and pin insulators. There are also described insulator hangers. The theoretical work is to describe thefittings for overhead transmission lines, which are, used to construct a insulator hanger. The last part of the theoretical work is intended distribution towers for overhead lines HV. The practical part deals with the design of new insulator suspensions for specific lines of 110 kV. The results are drawings newly designed hangers and a list of materials (fittings) for individual towers and the total amount of material. The practical part is calculating the differences in the conductor sag using old and new insulators hangers.
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Co-incineration sewage sludge in the existing plant
Krejčí, Tomáš ; Ferdan, Tomáš (referee) ; Frýba, Lukáš (advisor)
This thesis focuses on problems with co-incineration of sewage sludge in existing plants. The introduction of my thesis deals with a brief summary of a sludge management, sludge treatment methods and subsequent utilizations methods used for sledge disposal. Next chapter contains a calculation of calorific value, depending on the water content and volatile substances in dry solids of the sludge, it offers an overview of devices applicable for thermal processing of sludge and a description of the co-incineration in existing plants. The seventh chapter is devoted to the legislative parameters which influence the ways of dealing with sewage sludge. After the thermal treatment of sludge it is necessary to decontaminate flue gases of harmful substances resulting from incineration process, thus following there is a description of the most important devices used for its elimination or its reduction. My work ends with a search of methods dealing with the thermal sludge utilization in foreign countries.
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Lubrication of gasoline and diesel engines
Krejčí, Tomáš ; Vaverka, Michal (referee) ; Křupka, Ivan (advisor)
The main subject of this bachelor’s thesis is describing the present state of knowledge in the sphere of compression-ignition and spark-ignition engines lubrication, lubricants and future trends. First part is about internal combustion principle, engine construction. Next parts are about engine lubrication system, lubricating modes, and its locating in the engine. Last part is about oils, and insights into the future.
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Structural changes in the support phase of the step under the influence of increasing load using pressure shoe insole
Krejčí, Tomáš ; Šťastný, Jan (referee) ; Korvas, Pavel (advisor)
This bachelor thesis deals with the structural changes in the support phase of the step under the influence of increasing load. The measurements are provided by the "Medilogic WLAN insole" system, which can be used to perform static and dynamic pressure measurements on the feet using pressure sensors. In the theoretical part, information concerning the development of the lower limb, especially the leg and foot, and their anatomical structure is described. The biomechanics of gait is also described, including the main phases of the gait cycle. In the practical part of the thesis, the measurement methodology is described, including the instrument setup and the aids used during the measurements. Furthermore, the data processing procedure and its final analysis are presented.
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Návštěvnost v Krkonošském národním parku – ochota platit za kulturní ekosystémové služby a vliv pandemie Covid-19 na návštěvnost v parku
Krejčí, Tomáš
The thesis deals with the topic of willingness to pay for ecosystem services in the Krkonoše Mountains National Park. It also examines the impact of COVID measures on visitor numbers in this National Park. The aim of the thesis was to determine the potential willingness of visitors to the Krkonoše Mountains National Park to pay for entrance. A secondary aim of the thesis was to evaluate the effect of the Covid-19 measures on visitor numbers based on data from census facilities located in the National Park. A literature search method was used in the thesis to clarify the concept of ecosystem services, their valuation and payment for them, including the willingness-to-pay method. Quantitative research was used to fulfill the objective of the thesis in which data was collected from a questionnaire survey. The data was then compiled into contingency tables and interpreted using graphical displays. The most common amount that visitors are willing to pay to enter the National Park was found to be 50 CZK. Data from the census facilities showed that anti-Covid-19 measures that somehow restrict the movement of people have a negative effect on visitor numbers in the National Park.
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Polycentric urban forms: The relevance of scale for metropolitan and city planning
Malý, Jiří ; Krejčí, Tomáš
The paper deals with the importance of scale in metropolitan and urban planning, in connection with the promoted and often applied concept of polycentric development. Although the normative conceptualization of polycentricity to some extent reflects the multi-scalar dimension, the operationalization of the concept encounters a number of limitations and fuzzy meanings that result from different scales of analysis and interpretation. Using the Czech context of planning practice, the negligence of the importance of overlapping geographical scales and limits of binding spatial planning materials is documented. The dependence of polycentricity on the scale has consequences both for the analytical evaluation of the spatial situation of the settlement system and for the subsequent interpretation of the results and the setting of further development strategies.\n
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Prague Metro
Krejčí, Tomáš ; Novotná, Eva (advisor) ; Zikmund, Jan (referee)
Prague metro This bachelor thesis deals with the Prague Metro. The modern means of transport in addition to its main functions the role of architectural. My thesis deals with the history, incorporating urbanism and links to the organism of Prague. In addition, the work its examines the architectural and construction principles implemented within the building. The work of compiling and analysis of individual works of literature and with the help of my own experience.
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