National Repository of Grey Literature 75 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Integrated solution of waste gas-to-energy unit
Freisleben, Vít ; Buzík, Jiří (referee) ; Reppich, Marcus (referee) ; Jegla, Zdeněk (advisor)
Waste Gas-to-Energy (WGtE) units allow the thermal processing of gaseous waste and its simultaneous energy recovery. However, the operation of WGtE units involves a large consumption of external fuel, and the flue gases produced require the application of flue gas cleaning technology. This thesis presents the results of a study focused on the topic of integrated WGtE unit design, which is an effective approach for achieving external fuel consumption savings while minimizing investment costs. Firstly, it presents the developed analytical method for the design of technological modifications of existing WGtE units treating waste gases in order to achieve their economical and more environmentally friendly operation. Attention is mainly paid to the description of the developed mathematical relations and graphical tools that can be used by the professional community, especially by the operators of WGtE units. To further reduce the negative environmental impact of these units, the second area addressed in the thesis is the development of flue gas cleaning equipment for the reduction of nitrogen oxides concentration. In addition to the technological concept and design of this device, the results of experimental work in laboratory and industrial environment are presented, where the great potential of using these devices in WGtE units as well as in a wide range of other industrial combustion plants was confirmed.
The Balance of the Nitrogen in Agriculture
Klír, Jan ; Beranová, Jana ; Dědina, Martin ; Wollnerová, Jana
Methodology addressing nitrogen balance issues is a suitable tool for verifying the correctness of agricultural management and shows the relation between nitrogen used in agriculture and its losses in gaseous form to air or in the form of nitrates to surface and groundwater. The assessment of nitrogen balance, greenhouse gas emissions and pollutants is closely linked and therefore requires the quantification of nitrogen sources used in agriculture. Synchronization of input data used to evaluate nitrogen flows in agriculture is essential to increasing the methodological level of reporting the nitrogen balance, greenhouse gas emissions and pollutants for the Czech Republic in terms of the requirements of international organizations.
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Vertical gradient of ambient air pollutant levels
Binda, Denis ; Hůnová, Iva (advisor) ; Zíková, Naděžda (referee)
Ambient air pollution, caused by harmful pollutants, is considered a severe problem for the natural environment and its components. Effective pollution regulation is possible with reliable data from monitoring stations covering the whole country. Those stations are mainly located at the altitude of 2 m above the surface, possessing their well-known horizontal representativeness. However, the knowledge of the vertical representativeness of these monitoring stations is not sufficient, causing problems while determining the relevance of these measurements for studying the effects of pollutants in various altitudes. The gradient of ozone concentration (determining the change of ozone concentration for each 10 m) was computed to determine the vertical profile of tropospheric ozone (the gradient in this work is using the unit [μg.m-3 /10 m]). Data, containing the ozone concentrations, were measured in altitudes of 2, 8, 50 and 230 m and sourced from the National atmospheric observatory Košetice in the time interval from 6.9.2013 to 31.12.2020. The ozone concentrations show a yearly periodicity, with higher values during the summer period (from 1.4. to 30.9.) and lower values during the winter period (from 1.10. to 31.3.). The gradient for layer 230-50 m outlines considerable stability throughout the year...
Lichens and eutrophication
Jadrná, Iva ; Svoboda, David (advisor) ; Malíček, Jiří (referee)
Eutrophication is a process of organic nutrients enrichment in an ecosystem, especially nitrogen and phosphorus. This bachelor thesis is dealing with the influence of eutrophication on lichens, especially with the effect of nitrogen compounds in the air and the effect of the combination of nitrogen compounds with phosphorus on epiphytic lichens. Eutrophication is defined and information is provided on changes in abundance and diversity of lichen cover. The mechanisms of eutrophication tolerance in lichens are also described. Key words: lichens, epiphytes, eutrophication, ammonia, ammonium ions, nitrogen oxides, phosphorus
Reduction of nitrogen oxides from the flue gas stream on catalysts under non-standard conditions
Minář, Marek ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
The objective of the presented diploma thesis is reduction of nitrogen oxides from the flue gas stream on catalyst under non-standart conditions. Emphasis is places on the description of selected pollutants in flue gas (especially nitrogen oxides), legislative requirements for air protection and technologies for removal of nitrogen oxides, expecially methods of selective catalytic and non-catalytic reduction. The practical part is devoted to the reduction of nitrogen oxides by selective catalytic reduction on a pilot plant INTEQ II in the laboratory NETME Center. The subject of interest is the determination of the NOx reduction efficiency depend on the temperature for selected catalyst. The end of the practical part pursues with comparison of measurement results and their evaluation.
Research of Progressive Methods for Reduction of Emissions in CI Engine Exhaust Gasses
Franz, Rudolf ; Děrgl, Martin (referee) ; Stodola, Jiří (referee) ; Novotný, Pavel (advisor)
The scope of this dissertation work is a description of modern methods of reducing exhaust emission in diesel engines. The fundamental part is the application of these methods for diesel engines for off-road use that means for engines that are used in tractors and road machines. The mentioned evidence for the practical utility of the results of this dissertation thesis in practice and their verification on the actual engine are given in the conclusion.
Emissions from the burning of garden waste
Kuznetsova, Oksana ; Poláčik, Ján (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the issue of production of gaseous and solid pollutants in the incineration of garden waste. The aim was to carry out and evaluate the experiment. During the evaluation, it was found that the incineration of garden waste produces many times more emissions, than the incineration of wood in the boiler. The reason for the high emission concentrations was the fuel composition and the combustion process. Furthermore, fine particles in the range 17.5–532.8 nm were investigated. In the theoretical part, a literary search was created, which was based on Czech and foreign professional literature.
Technology to remove nitrogen oxides (NOx) from flue gases for large combustion plants
Kučera, Jan ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
This diploma thesis deals with selected abatement techniques of nitrogen oxides (NOx) developed for large combustion plants. The first part describes selected NOx, their properties and explains the formation during combustion. Furthermore, there is an analysis of current legal legislation regulating the issue of emission limits. The third part presents selected primary and secondary measures that are widely used. The emphasis is placed on the description of selective catalytic (SCR) and non-catalytic reduction (SNCR). Finally, the basic design of these technologies for model combustion equipment is performed. The consumption of reducing medium and the volume of the catalyst for the mentioned techniques are calculated here. The estimate of selected operating and investment costs is a part of the basic scheme.
The influence of the combustion air temperature on parameters of the combustion process
Šimeček, Radek ; Hudák, Igor (referee) ; Skryja, Pavel (advisor)
Tato diplomová práce se zabývá předehřevem spalovacího vzduchu a jeho vlivem na parametry spalovacího procesu. V teoretické části je zpracován přehled nejčastějších znečišťujících látek z průmyslového spalování. Je popsána aktuálně platná relevantní legislativa v Evropské unii a jsou porovnány její implementace do národní legislativy v České republice a v Německu. Dále je provedena klasifikace hořáků z hlediska různých kritérií a rešerše předchozí práce v oblasti předehřevu spalovacího vzduchu. Na zkušebně hořáků byla provedena experimentální studie dvou různých hořáků na zemní plyn při konstantním tepelném příkonu 750 kW se spalovacím vzduchem předehřátým až na 250 °C. Výsledky odhalily pozitivní vliv předehřevu na účinnost spalování. Množství emisí NOx a CO naopak rostlo s teplotou spalovacího vzduchu.
Diesel Particulate Filters
Haratek, Marek ; Janoušek, Michal (referee) ; Dundálek, Radim (advisor)
This bachelor thesis is focused on creation of particulate matter during combustion in diesel engines and their trapping in DPF systems. The first part deals with particulate matter and emission standards in Europe and USA. There is described filtration principle, types of regeneration and DPF variants in the second part. Afterwards the thesis is concentrated on particular DPF system applications used by representative car makers and there is also introduced range of products of some diesel particulate filter manufacturers, including description of construction variants and used regeneration technologies.

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