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Analysis of technology for checking the tightness of manufactured heat exchangers with a focus on increasing its reliability
Grúz, Jan ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This master thesis deals with the analysis of the leakage checking technology of heat exchangers in a selected industrial company. According to this analysis the specific improvement proposals with the potential to increase the reliability of this technology are identified, selected and created. This analysis is carried out through consultations and meetings with the employees of the company and also with the help of the provided data and information. On the basis of this analysis, the technical background research of the leak testing technology and the DMAIC methodology, specific modifications with the potential to improve the operated technology are proposed and the amount of investment to implement them is estimated.
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Heat exchanger design to improve the efficiency of industrial plant
Hofbauer, Jan ; Kilkovský, Bohuslav (referee) ; Freisleben, Vít (advisor)
In thesis is done thermal-hydraulic design of cross-flow tubular heat exchanger for combustion air preheating. In software Chemcad is done simulation of technological unit based on known operating data, which is used for behavior prediction of unit after heat exchanger installation. Then there are discussed essential mechanisms of heat transfer. After that there is overview of different heat exchanger types used for combustion air preheating. Before particular design there is performed optimalization of heat duty of heat exchnger based on payback time. Thermal-hydraulic design is performed using F-LMTD method in software GNU Octave. Obtained results are verified using software HTRI Xchanger Suite®. At the end there are discussed economical and ecological benefits of designed heat exchanger.
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Software support in creating a complex calculation tool
Zich, Jan ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
The master’s thesis is focused on the calculation of a heat exchanger with a crossflowed tube bundle found most in the air-cooled heat exchangers. The knowledge gained from the literature search is used to create libraries, giving a choice of several different methods in the hydraulic and thermal calculation as well as other key areas. These libraries allow their implementation in the comprehensive computational software P.E.C. developed at the Institute of Process Engineering. The thesis includes a verification of the correctness of the library’s calculations with showcased problems as well as 2 parametric studies. These investigate the dependencies of the transverse and longitudinal pitch on some of the process parameters of the heat exchanger.
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Evaluation of particle deposition rate in cement plant ductwork
Dorniak, Michal ; Kilkovský, Bohuslav (referee) ; Vondál, Jiří (advisor)
The submitted thesis deals with calculation of pressure drop in pipeline of cement industry, which is directly correlated with energy consumption of raw mill exhaust fans. The introduction in submitted thesis describes theoretical basics of cement production. Part of theoretical analysis is about detailed study of calculations of different friction factors. Separately for gas and separately for solids. In the practical part, a mathematical model of universal configuration of pipeline for pressure drop calculations was created. The last part evaluate impacts of pressure drop on energetic demands of raw mill exhaust fans.
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Selected designing works on the acid water stripping process
Motyka, Ondřej ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The diploma thesis is focused on selected designing works related to the design of a specific process of acid water stripping. The main purpose of the work is to describe the procedure and the obtained results for these performed design work based on the relevant assignment and the process requirements. In the introductory two chapters, the work focuses on process introduction and description of main process equipment. The following chapters are devoted to the description of the designing works, specifically simulation of the process in CHEMCAD, design calculation of the spiral plate heat exchanger for feed preheating, creation of 3D model and drawing documentation using AutoCAD Plant 3D and lastly strength analysis of the selected pipeline. The main outputs of this work are mainly generated result reports from the process and equipment simulation and strength analysis of the solved pipeline route, 3D model of the process and selected technical and drawing documentation. At the end of the diploma thesis, the performed activities and their outputs are summarized and evaluated.
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Experimental support for the development of specific integrated equipment
Hrbáček, Jiří ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
Regenerative heat exchangers are used in a wide range of industries and in the technical equipment of buildings. These heat exchangers play an important role in saving thermal energy and removing volatile organic compounds from flue gases. The theoretical part of the work deals with the division of regenerative exchangers into rotary and switching exchangers and the possibilities of their use. These types of heat exchangers are used in many applications, e.g. as a heat exchanger using waste heat to preheat the process gas (regeneration layer), or as catalysts to accelerate the reaction required to remove volatile organic compounds (catalytic layer), or as integrated equipment where both the regeneration layer and the catalytic layer. The aim of the diploma thesis is experimental support in the development of a computer program for the design of a specific integrated device. The program allows the calculation of the regeneration and catalytic bed, or both beds simultaneously, i.e. integrated equipment. The diploma thesis deals with the support of a mathematical model for the calculation of the regeneration bed. Pressure loss and heat transfer play an important role in the selection and subsequent calculation of a suitable bed. To calculate them, it is possible to find more available computational relationships that differ significantly in their accuracy. It is therefore necessary to select the most suitable ones for the computational model. The practical part of the work then deals with research, analysis, and assessment of the suitability of methods used to calculate pressure losses based on a comparison with the values measured on experimental equipment. Subsequently, the work deals with computational methods for determining the heat transfer coefficient of the packed bed. A significant part of the practical part deals with the modification of the experimental equipment for the verification of computational relations for the determination of heat transfer with measured data.
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Concepts of an integrated equipment for waste-to-energy units
Petrasová, Zuzana ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The diploma thesis deals with design modifications of the investigated industrial „waste-to-energy“ unit and possible deployment of modern integrated equipment instead of existing devices that would reduce economic demands and improve environmental impacts of thermal treatment of gaseous waste in order to increase thermal efficiency. Within the considered modifications, possible modifications of the process according to current technological trends are presented. For all solved devices, investment costs were determined according to the price offers of suppliers in accordance with professional literature, which deals with the economic aspect during the phase of synthesis and selection of the most suitable concept from the investor's point of view. The Venture Profit is used as a measure of the profitability of a given operation to evaluate individual modifications. The output of the thesis is to determine the optimum modification for the process based on the mentioned criteria.
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Quantification of the thermohydraulic characteristics of the flexible element using experimental data
Sochorec, Rostislav ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The diploma thesis aims to establish thermo-hydraulic properties of a flexible tube described by its Darcy friction factor and film heat transfer coefficient respectively. A flexible tube (corrugated stainless steel tube) is an easily shapeable stainless steel component used to build various piping connections, in a place of more common copper or plastic made tubes. It can also be used to build heat exchangers thanks to its signature properties. The investigated product is the one developed and manufactured by the Czech company Flexira s.r.o. and sold under the brand name xConnect System. Its thermo-hydraulic properties are established by an experiment, which is based on real utilizations by Laboratory of Energy Intensive Processes in NETME (New Technologies for Mechanical Engineering) Centre at Brno University of Technology. The investigated case is a coil-shaped element serving a purpose of a water-to-water heat exchanger. The text contains a literature survey of the chosen flexible tube and a description of a draft and development of the specific experimental test based off the established theory. The obtained results are then analysed, for the purpose of establishing a functional dependence, which can then be used to calculate a film heat transfer coefficient.
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Design of high-pressure heat exchanger
Marada, Petr ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The aim of the thesis is to design a heat exchanger for heating natural gas in the mining process and subsequent treatment. The first part describes natural gas itself, its origin, mining and ways of treatment. There are described technologies used for finding the deposits itself or processes by which water, sulfur and solid particles are removed from the extracted gas. The next section deals with the types of heat exchangers most commonly used in industry. There are also described basic relations for heat-hydraulic calculation of heat exchanger. In the practical part the heat exchanger itself was designed. World-wide HTRI software was used for the heat-hydraulic calculation and for strength calculation according to the standard ČSN EN 13445 was used sofware Sant´ Ambrogio.
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Technical and economic evaluation of the gas microturbine with the waste heat recovery system
Slovák, Rostislav ; Kilkovský, Bohuslav (referee) ; Máša, Vítězslav (advisor)
The use of gas microturbines as a primary unit in CHP is still weak in the industrial process. It gives the driving force to the main aim of this master thesis, which is the technical and economic evaluation of the gas microturbines waste heat recovery system, which is the key factor for their economic sustainability. Assignment contains description of CHP system that was gradually built in LENP laboratory, part of NETME Centre. The author has joined the final work before start-up of the CHP system. He presents and describes results of the first experiments on this unit. The flue gas of a microturbine was used for heating water by heat exchanger flue gas–water and for direct linen drying. The case study of laundry with capacity 10 tons per shift was developed in cooperation with companies in laundry care. Results of those tests were used to process integration and utilization of this professional industrial laundry All obstacles found and opportunities of the use of microturbines are comprehensively described and tested in case studies, which are simulated in Chemstation Chemcad Software. Results of the thesis are expected to be useful these fields: the use of gas microturbines in industry & energy savings in industrial laundries.
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