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Automatic measurement of LED spectrum
Žabka, Jindřich ; Hudcová, Lucie (referee) ; Skryja, Petr (advisor)
Teoretical part of the thesis is introducing light sources. Here are examinated the principles of light generation in these light sources, basic radiometry and photometry variables, according to which are these sources sorted and their operating parameters. The parameters describing quality of light sources are also mentioned here. Next part examinates LEDs, theirs usual construction types and most common SMD LED packages. Part about optical spectroscopy describes usually used components for optical measurement. Practical part narrates appropriate organization of workplace, LabVIEW platform, communication process with instruments and a guide describing measure process. There is a solved laboratory protocol as an attachement.
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Automatic testing of gas leak detector
Skryja, Petr ; Malinowski, Radim (referee) ; Novák, Marek (advisor)
This work deals with the automatic testing of an ultrasonic gas leak detector, which has to be tested during normal changes in the development phase. The reader will be acquainted with the basic principles of gas detection, design of the test product, software architecture its implementation. The following is a presentation of the application and instructions for writing tests. In this work, the Beaglebone Black development board with the Debian operating system is used as the core of the entire test product.
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The Influence of Operating Parameters and Construction Parameters of the Process Burner on Stability and Combustion Processes Parameters
Skryja, Pavel ; Jegla, Zdeněk (referee) ; Odstrčil, Miloslav (referee) ; Stehlík, Petr (advisor)
The objectives of this paper focus upon composing recommendations with respect to burners design while observing aerodynamic, together with present and advanced developments in the field of flame technology principles. Specifically the aims are set at flame stability and pollutions. Important part of this paper is a novel design procedure dealing with premixed burners. Further, by exploiting the results of testing program enabled one to design burners exhibiting low level of nitrogen oxides emissions. On the basis of aerodynamic analysis of premixed burners flow path several recommendations on the geometry resulted in proposing two ejectors, which transport the combustion air. In the first ejector the fuel jet, generated by flow through a nozzle, draws the specified part of the combustion air, and then the mixture is a driving agent of the second ejector. The remaining part of combustion air flows first through the radial curved vanes, and second its tangential velocity component is augmented by axial vanes prior it enters mixing part of the second ejector. For the additional contribution to the rotating motion the inclined axial vanes built inside the nozzle of the second ejector are responsible. The resulting swirling number reaches the values up to 2.6. For the burner so arranged fire stability and low NOx emissions in the wide operating conditions can be expected. Within the frame of extensive testing program in the field of diffusion burners several modifications have been carried out such as setting of axial vanes which secure the swirling motion, changes of combustion air flows path, and modifications of secondary nozzles, these resulted in extending zone of stabilized flame and reducing the formation of NOx, e.g. NOx emissions of 70 ppm, prior the modifications, have dropped to 30 ppm (dry flue gas 3% O2). The main contribution of this paper stands in applications of development activities results in aerodynamic and flame within their implementation in the field of burners design. Further, it is the proposed design of burners which are capable of simultaneously firing products of the biomass microwave pyrolysis, namely syngas and bio-oils.
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Automatic measurement of LED spectrum
Žabka, Jindřich ; Hudcová, Lucie (referee) ; Skryja, Petr (advisor)
Teoretical part of the thesis is introducing light sources. Here are examinated the principles of light generation in these light sources, basic radiometry and photometry variables, according to which are these sources sorted and their operating parameters. The parameters describing quality of light sources are also mentioned here. Next part examinates LEDs, theirs usual construction types and most common SMD LED packages. Part about optical spectroscopy describes usually used components for optical measurement. Practical part narrates appropriate organization of workplace, LabVIEW platform, communication process with instruments and a guide describing measure process. There is a solved laboratory protocol as an attachement.
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Rating thermal calculation of fire tube water heater
Polášek, Kryštof ; Skryja, Pavel (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis deals with thermal calculations of fire tube water heater. The first part of the thesis describes different classifications of boilers and water heaters and provides a basic overview for different types of commonly used boilers. The next part describes thermal calculation model created in Maple software, used formulas and algorithm of the model. Subsequently, the model is applied to the experimental water heater in the form of computational rating. In the last part of the thesis the model is applied to the existing operated industrial water heater to evaluate predictive ability of the calculation model by comparing the essential operating parameters obtained from the calculation with real data measured on the water heater.
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Design of a technological line for recycling autoclaved aerated concrete
Bajzík, Martin ; Bojanovský, Jiří (referee) ; Skryja, Pavel (advisor)
The diploma thesis is focused on the design of a production line for processing waste material from autoclaved aerated concrete production. The introduction of the thesis describes the current situation with aerated concrete waste processing, it´s characteristics, raw materials used for the production and the production technology. The theoretical part of the thesis reviews the crushing process and the equipment used in mineral processing lines such as: crushers, mills, separators and conveyors. In the practical part of the thesis the focus is on the design of the production line, selection of the equipment, mass balance and economical evaluation of the investment.
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Structural design of an experimental air preheater
Tichý, Jiří ; Skryja, Pavel (referee) ; Jegla, Zdeněk (advisor)
The thesis is focused on structural design of unconventional experimental combustion air preheater into drawing documentation needed for production and realization. Strength and expansion control of exposed elements of construction is also included in the thesis. The final design is obtained by gradual specification of pre-designed and strength and expansion controlled elements of construction. The work also includes discussion of structural properties of the final design.
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Combustion of renewable liquid fuels
Shylin, Ivan ; Skryja, Pavel (referee) ; Kermes, Vít (advisor)
The main task of the thesis is the survey of renewable fuels available in Czech Republic and in the world, and to compare them with present petroleum products. In the first part of the thesis important properties of the liquid fuels are defined along with corresponding national and international standards. In the next chapters petroleum and renewable liquid fuels are presented. The second part of the thesis is concentrating on atomization. In the conclusion there is a summarization of difficulties with renewable fuels.
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The influence of the furnace gas recirculation on characteristic parameters of the combustion process
Macenauerová, Tereza ; Skryja, Pavel (referee) ; Bělohradský, Petr (advisor)
This thesis deals with the evaluation of emissions of NOx and CO formed during the combustion process when the burner utilizing fuel staging and internal flue gas recirculation is used. In the theoretical part the NOx formation mechanisms and methods used to suppress their formation are described. This is followed with the currently valid legislation in the Czech Republic in terms of the emission limits for NOx and CO in stationary sources. In the work, combustion tests were performed at the burners testing facility at UPEI BUT. The tests revealed that the most important parameters, which influence the NOx formation, are fuel staging, increasing combustion air excess and the utilization of new equipment that induces the flue gas to be drawn back into the burner. The equipment is installed in the burner’s air channel. The dependence of flue gas temperature, heat flux to the combustion chamber’s section walls and in-flame temperatures distribution in the horizontal symmetry plane of the combustion chamber on various parameters were investigated. The parameters included the geometry of the equipment for flue gas recirculation, primary/secondary ratio, geometry of nozzles for secondary fuel supply, tangential orientation of these nozzles towards the burner axis, and the excess of combustion air.
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Combustion of renewable liquid fuels
Nejezchleb, Radek ; Skryja, Pavel (referee) ; Kermes, Vít (advisor)
This thesis is concerned with combustion of liquid biofuels, and possibility of using liquid biofuels for lower heat output power units. Overview of basic usable liquid biofuels in Czech Republic is executed in the beginning of the thesis. This part is focused especially on production method and energy effectivity of rape-oil methyl ester (RME) and bioethanol production. Overview of basic atomization method of liquid fuels is executed in next chapters. The focus is stressed on pneumatic atomization, especially effervescent atomization method, which was used in practical experiment. Practical part contains fossil fuel and selected biofuel (RME) combustion test executed on burner testing device. Basic combustion properties was found and test plan was made before executing the test. Various operating conditions are compared in terms of atomization quality, combustion quality and geometrical characteristics of flame. Usability of tested liquid biofuels for lower heat output power units is evaluated in the conclusion.
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