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Design of facility for egg-shells transportation
Hruška, Kryštof ; Naď, Martin (referee) ; Pernica, Marek (advisor)
Egg shells are a very suitable basic raw material for the production of mineral dietary supplements. The thesis deals with one of the processes in their production, the transportation of the commodity after flush into a clean room. The thesis proposes possible solutions, which are described in the research part, on the basis of which a screw conveyor is chosen as a suitable solution and a design solution is proposed. Based on the calculations, the individual parts of the conveyor are selected and designed. The entire device is modeled in SolidWorks and the drawing documentation contains the overall drawing of the assembly.
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The effect of boiler tube bundle fouling on its service life
Volná, Kateřina ; Ing. Zdeněk JŮZA, Ph.D., MBA (referee) ; Naď, Martin (advisor)
Fouling of tube bundles in boilers on the flue gas side affects not only the service life, but also the boiler heat output and increases maintenance and operating costs. Therefore, it is necessary to minimize or completely eliminate this process. This thesis focuses on comparison of the service life and the heat output of the tube bundles with and without deposit in the coal fired boiler. Simulations of flue gas flow in area of tube bundles with and without deposit are performed using ANSYS Fluent software, which shows that the surface of tube bundles with deposit is much less heated than the surface without deposit. The thermal loads of tubes obtained by the CFD analysis are applied to the model, which is created in the program ANSYS Mechanical, where the calculation of the temperature field in the cross section of the pipe is realized. The effect of fouling on creep life and heat output is then evaluated based on simulation results. The results show that fouling increases creep life, but significantly reduces heat output of heavily fouled tubes. Hence the flue gas flows at a higher temperature to the rest of the tube bundle, and the service life of those tubes will therefore probably decrease.
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Structural design of heat exchanger pair
Pernica, Marek ; Buzík, Jiří (referee) ; Naď, Martin (advisor)
This master’s thesis deals with structural design of twin heat exchanger with vertically stacked horizontal vessels according to CSN EN 13 445 standard. Brief introduction and basic characteristics of shell and tube heat exchangers is performed in the beginning part of the thesis. Design of the heat exchanger was initially performed using design by formula (DBF), which was verified by specialized software Sant´Ambrogio. Since this approach does not include methods for assessment of the nonstandard connection between the vessels, simulations of significant load states were performed using FEM analyses followed by result evaluation using stress categories.
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Complex strength design of condenser
Denk, Jakub ; Naď, Martin (referee) ; Lošák, Pavel (advisor)
This diploma thesis focuses on strength design of steam condenser. The goal of the thesis is to make strength calculations for the specific operation conditions, introduce possible solutions, provide recommendations and refer to weak points of such calculation procedures. First, thermal-hydraulic design in HTRI software is performed. Strength calculations respect ČSN EN 13445 standard. Strength calculation with imported temperature field is performed in ANSYS Workbench software. In the next step, another strength calculation is realized in Sant´ Ambrogio software. Results are evaluated in conclusion chapter, including recommendations for the possible following work.
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Design of heat exchanger chamber
Horník, Jan ; Naď, Martin (referee) ; Klučka, Ivan (advisor)
The master thesis is focused on the field of heat exchangers. Theoretical part makes the reader familiar with heat exchangers. Practical part is focused on design of chamber, which is part of heat exchanger. Practical part consists of strength calculation by standard ČSN EN 13445. Dimensions of tube sheet are gained in program Visual vessel design. Those parameters are used for creating of 3D model with accurate dimensions which is analyzed in ANSYS Workbench. Output of this analysis is evaluation by stress classification. Practical part is supplemented by drawing of heat exchanger.
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Linear buckling analysis of a flue gas pipe
Jančík, Jan ; Klučka, Ivan (referee) ; Naď, Martin (advisor)
The diploma thesis deals with the loss of stability of thin-walled flue pipe at coal power plant. The problem of thin-walled structures is their propensity to the loss of stability due to abnormal conditions, for example a vacuum, effect of wind, snow and earthquake. The purpose is to find the optimal deployment of reinforcements so that the model meets the requirements of EN 1993-1-6. This required an evaluation of unreinforced version of the model to identify weaknesses and subsequently other configurations for the application of reinforcement. For determining the resistance the flue pipe to the loss of stability used primarily to access linear bifurcation analysis based on linear analysis, possibly materially nonlinear analysis. The result of work is a design of reinforcement of pipeline which under the requirements of the standard meets the latest model with a reserve of approximately 20 %.
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Modelling of oxygen-enhanced combustion process
Naď, Martin ; Juřena, Tomáš (referee) ; Bělohradský, Petr (advisor)
The main purpose of the master´s thesis is the experimental study and the mathematical modelling of the combustion process in which the combustion air is enriched with the high-purity oxygen, i.e. the oxygen content is more than 21 %. This combustion technology is called as the oxygen-enhanced combustion (OEC). Since the experimental work required the manipulation with the pure oxygen, a part of the thesis is focused on risks and necessary safety associated therewith. The detailed description of the combustion chamber as well as of the components necessary for the operation of OEC is included. The main part of the thesis is the computational model of the combustion chamber and the simulation of OEC using CFD methods. The numerical results were then compared with the experimental data acquired during the combustion tests, namely the heat flux distribution along the combustion chamber and the distribution of in-flame temperatures in the horizontal symmetry plane of the chamber.
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Virtual modelling of computional domain for CFD simulations
Volek, Matěj ; Naď, Martin (referee) ; Dohnal, Miloslav (advisor)
This thesis is devoted to open-source software for meshing in CFD simulations. In the opening chapter, there is introduced the computational modeling of fluid, briefly described governing equations and an introduction to the discretization of computational domain. The second chapter deals with the available mesh software. The programs are described in this chapter from the perspective of the user interface, the ability to create meshes, etc. The last chapter, there is a comparison of two selected programs on a real problem. In both programs was created a mesh which was calculated in the software Fluent. Then the calculation results are compared.
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Calculation of heatexchanger
Kvapil, Matěj ; Naď, Martin (referee) ; Klučka, Ivan (advisor)
This bachelor thesis focuses on strength calculation of a heat exchanger according to ČSN EN 13445. First stage is an introduction into the theme of heat exchangers and their calculation. Next part is about the calculation according to ČSN EN 13445 itself. Part of this thesis is also strength analysis of selected items using numerical method (FEM). Annexes include calculation in software Microsoft Excel and basic drawings of items.
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Burners for high-temperature industrial applications
Naď, Martin ; Hájek, Zdeněk (referee) ; Bělohradský, Petr (advisor)
The main purpose of the bachelor thesis is the discussion of different types of burners and their components. Emphasis is placed mainly on the combustion process with oxygen content more than 21 % in the combustion air, the so called oxygen-enhanced combustion (OEC). The thesis describes characteristic features, possibilities and appropriateness of its use. Since in handling of oxygen there is a level of risk of injury, the thesis also assesses the safety and risks associated therewith. As the combustion process in terms of OEC is significantly different from the conditions of combustion with the atmospheric air, the thesis analyses the impact of the content of oxygen in atmospheric air on flue gas temperature and fuel consumption.
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