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Fatigue evaluation methods for pressure equipment utilising numerical analysis results
Boleloucký, Václav ; Lošák, Pavel (referee) ; Létal, Tomáš (advisor)
Diplomová práce se zabývá hodnocením únavové životnosti v okolí konstručního uzlu tlakové nádoby, kde vzniká výrazná koncentrace napětí a je zde předpoklad primárního vlivu na únavu materiálu. Konkrétně se jedná o místo přechodu kontrolního otvoru do pláště analyzovaného zařízení. Práce obsahuje teoretickou a praktickou část. V teoretické části jsou představeny pojmy a metody hodnocení, související s danou problematikou. Na základě těchto metod je provedena analýza konstrukčního uzlu tlakové nádoby. Analýza je provedena metodou konečných prvků na skořepinovém a objemovém modelu nádoby v softwaru ANSYS Workbench, její výsledky dále zpracovány a vyhodnoceny dle aktuálního návrhu úpravy evropské harmonizované normy EN 13445--3, kapitoly 18. Výsledky analýz jsou hodnoceny v závěru práce.
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Check calculation of parts of the pressure vessel
Bukal, Oldřich ; Lošák, Pavel (referee) ; Létal, Tomáš (advisor)
Pressure vessels play irreplaceable role in different branches of industry. From the perspective of pressure vessel construction high reliability and safety are required. This bachelor thesis is focused on control calculation of the basic parts of a vessel according to the standard ČSN EN 13445-3 including FEM analysis followed by stress categorization.
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Oxide scales damaging evaluation
Audyová, Markéta ; Vejvoda, Stanislav (referee) ; Lošák, Pavel (advisor)
This work is focused on oxide scale failure and characteristics created in high temperature – supercritical processes. The presence of high temperature corrosion in supercritical processes is minimalised by selection of the right material. For this work was selected material X10CrMoVNb9-1, where formulas of present oxidation scales are Fe2O3, Fe3O4 and FeCr2O4. Each oxidation scale has its own mechanical properties thus it is important to notice scale arrangement, thickness and geometry. Oxide scale mechanical properties, scale failure mechanisms and oxidation scale growth is evaluated in this work. Tension and pressure oxide scale failure are determined by critical values, which are mentioned in this work. Thanks to these values there was possibility to verify the authenticity of the finite element model. Oxidation scales created in heat exchangers are badly accessible thus it is difficult to observe them or remove them mechanically. Tube finite element model with oxidation scales was created in this work. There are simulations of scales on selected steel in supercritical conditions (pressure 24 MPa, temperature 500 °C). Simulation and analytic results are compared. Failure operative conditions are searched for scale FeCr2O4 until its compleate delamination and separation from metal. Aim of this work is to create an oxidation scale model with a possibility of futher use.
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Comprehensive design of mini cheese factory
Kamarád, Miroslav ; Naď, Martin (referee) ; Lošák, Pavel (advisor)
Food industry occupies a prominent place in branch of process engineering. From design process equipment point of view, great emphasis is placed on hygienic requirements, accuracy, reliability and above all safety. The diploma thesis is focused on comprihensive design of milk heating technology for cheese production with high-temperature curd. The diploma thesis describes technological and constructional design of technology. The diploma thesis also contains basic design of measurement and regulation.
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Strength desing of hanger with non-standard dimmensions
Zajíc, Jonáš ; Buzík, Jiří (referee) ; Lošák, Pavel (advisor)
This bachelor thesis was created in cooperation with MPS Gradior. The thesis deals with the design and analysis of one-dimensional hanger with non-normalized dimensions for DN 1400 pipes. The aim of the bachelor thesis was to create a design of non-standardized pipe hanger based on the previous background research. The subsequent strength analysis under static force loading was performed using the finite element method with help of the ANSYS software. After verification of the functionality and the security of the proposed model, detailed drawing documentations have been developed to serve as the basis for a production of the prototype part.
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Life-Time Management of Process Devices in Industrial Practice
Lošák, Pavel ; Klemeš,, Jiří (referee) ; Ing. Zdeněk Jůza, Ph.D. MBA (referee) ; Vejvoda, Stanislav (advisor)
This dissertation examines life-time management of process and energetic devices in industrial practice, mainly in the area of steam power plants. Furthermore, it focuses on frequent damage mechanisms occurring in this area. It summarizes basics of damaging mechanisms occurring in the process industry area, their monitoring, evaluation and prediction. In the area of steam power plants, the main emphasize was placed on cumulative damage mechanisms. Within the dissertation, mechanisms of creep, fatigue, and their combinations were assessed. Major European standards were examined in order to discuss the amount of contained conservatism and their usability. Subsequently, attention was paid to the methods applicable for creep and fatigue combination evaluation. In the next step life-time monitoring and evaluation standard was discussed. The diagnostic software was created which includes creep, fatigue and creep-fatigue combination evaluation according to valid standards. For online life-time evaluation was proposed refined analytical solution for stress and strain calculation. To further extend the life-time management, the dissertation describes oxide scale damaging together with its evaluation and implementation into diagnostic software. The proposed software is extended by the material module which on the basis of defined materials allows easy and effective usage of material characteristics. For the purpose of refining life-time prediction accuracy, experimental device was schematically described. In addition, the device should be also able to verify used equations. Furthermore, the dissertation includes solution to industrially oriented cases. Firstly, a steam generator with damaged pipes was analyzed, afterwards damaged transferring pipeline. Further analyses deal with U-tube heat exchanger and its damaging. The causes of damage were discovered and corrective measures were proposed. The dissertation concludes with the summarization of potential activities for subsequent research in examined area.
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Possibilities of educational MOOC courses
Kocháň, Matouš ; Hudák, Igor (referee) ; Lošák, Pavel (advisor)
The diploma thesis explores the possibilities of MOOC online courses and their implementation for ČSN EN 1591-4 standard. Firstly, Czech and global providers of MOOCs are discussed and compared. There are over 220 million MOOC active users globally. Then, the content of a course regarding the ČSN EN 1591-4 standard is created. This standard defines the necessary knowledge that mechanicians must acquire to install flange joints in critical applications. In the experiment, the importance of lubricating the fastener is pointed out. The outcome of the thesis is ten videos in Czech and in English that cover the courses' content and the experiment. The author entered a discussion with a Dutch Engineering Trainer platform which expressed interest in the ČSN EN 1591-4 course. In the end, the possibilities of course commercialization, fees, and profit are explored. There are several MOOC platforms open to publishing a course. Nevertheless, it is not possible to post the same course on two platforms simultaneously.
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Microalgae harvesting
Drozd, Jiří ; Naď, Martin (referee) ; Lošák, Pavel (advisor)
This work describe microalgae and their properties. Within the scope of the work, a research was conducted on the utilized microalgae and the possibilities of cultivation in the Central European region were examined. Furthermore, harvesting and drying methods for microalgae were analyzed, and an experiment was conducted using a promising spray drying method. The research revealed the properties and potential uses of microalgae. Various types of microalgae, their nutritional values, and possibilities of application in a wide range of fields were investigated. The cultivation possibilities of microalgae in the Central European region, including the utilization of wastewater and renewable energy sources, were also examined. Harvesting and drying methods for microalgae were analyzed, considering the advantages and disadvantages of different techniques such as flocculation, centrifugation, and spray drying. An experiment utilizing the spray drying method was conducted, and the results showed that this method is effective and enables the achievement of high quality and purity of dried microalgae. The work also explores the possibilities of further development and utilization of microalgae. It describes the potential use of microalgae as food supplements and as alternatives to traditional protein sources. Additionally, the potential applications of microalgae in the pharmaceutical and cosmetic industries were mentioned. In conclusion, this work provides information on the utilization of microalgae and the methods of cultivation, harvesting, and drying. The results suggest that microalgae have great potential for further development and utilization in various industries.
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Design and testing of a horizontal photobioreactor
Šuráň, Michal ; Máša, Vítězslav (referee) ; Lošák, Pavel (advisor)
The master’s thesis deals with a microalgae cultivation and construction of the test unit. The first section focuses on phototrophic cultivation of microalgae including design solutions of photobioreactors. The second section is devoted to research on the use of microalgae along with Carbon Capture technologies. The third part deals with the design and assembly of the horizontal tubular photobioreactor. The last section describes the measurement of the cultivation conditions and testing of the photobioreactor.
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