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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
311

Pěstování vybraných druhů rostlin pro energetické využití

ŠVEC, Miroslav January 2018 (has links)
This diploma thesis on the topic "Cultivation of selected plant species for energy use" in the first chapters of the theoretical part deals with Czech and world energy. The chapters on renewable energy sources and the possibilities of using biomass for plants for energy purposes follow. The research also deals with grasslands as alternative energy sources with a focus on direct burning. The last chapters of the research are focused on the cultivation of selected energy crops, such as the Elymus elongatus grass (subspecies Ponticus, Szarvasi-1) and Miscanthus × giganteus. The practical part describes the establishment, nursing and harvesting of small-scale experiments of Szarvasi-1 grass and Miscanthus × giganteus grass varieties, which were cultivated on the premises of the University of South Bohemia in České Budějovice and were grown as energy crops for direct incineration. Experiments with the Szarvas-1 cultivation took place in three types of farming. The first variation was the so-called "extensive" form where the plants were not fertilized with any fertilizer. The second form of farming was the "intensive" variant, in which the fertilizer was fertilized with mineral fertilizers. The last variant labeled "digestate" was fertilized with organic fertilizer. Maloparcelian experiments with Miscanthus × giganteus were carried out only in one variation of cultivation than Szarvasi-1, "intensive". For both varieties of energy crops harvested in spring 2013 and for all cultivation variants, the yield potentials from the last five years of vegetation of these cultures were evaluated after a six-year vegetation period. The evaluated parameters were in particular the yields of fresh matter and dry matter in t ha-1, but also the average solids content in %. These results were recorded and compared with specialist literature. The results of the work show that Miscanthus × giganteus yields on average higher yields than Szarvasi-1, which surprisingly best responds to organic fertilizer fertilization.
312

Analýza pracovních technologií při zpracování dřevní suroviny rychle rostoucích topolů a obdobných dřevin pro jejich další využití. / Analysis of technologies for processing wood raw material fast-growing poplar trees and similar trees for further use.

PLEVKA, Vojtěch January 2010 (has links)
The dissertation analyzes the work technology in the processing of fast growing poplar trees and similar trees. In the experimental section were described two different methods of processing the lines of fast-growing poplar trees. It was further verified by the performance and suitability of use Doppstadt AK 450 shredder processing fast-growing poplars and similar trees.
313

Studie proveditelnosti a analýza projektů bioplynových stanic v ČR / Feasibility study and analysis of projects of biogas stations in Czech Republic

Lodr, Jakub January 2006 (has links)
Diplomová práce zahrnuje poslední vývoj v oblasti obnovitelných zdrojů energie. (OZE).Hlavním úkolem je seznámit čtenáře se současnými otázkami týkajícími se bioplynu,bioplynových stanic a dalším technologickým problémům. První část je věnována právnímu rámci této problematiky. V dalším oddíle je popsáno současné tržní prostředí,doplněné charakteristikou nejdůležitějších podniků v odvětví. Poslední část diplomové práce by měla pomoci najít způsob jak ocenit investice do obnovitelných zdrojů energie.
314

Hodnocení ekonomické efektivnosti investice - bioplynová stanice / Evaluation of economic efficiency of investments - biogas plant

Zemanová, Pavlína January 2010 (has links)
The subject of this thesis is to evaluate investments in biogas plant purchased by company AGRA Deštná, a.s., which is located in Deštná, near Jindřichův Hradec. The thesis is divided into two main parts. The theoretical part is devoted to theoretical assumptions of investment evaluation, grants, theories and legislation related to the biogas plant. The practical part of the thesis describes the current situation of the company, investment, and economic evaluation of investment in the construction of biogas plants.
315

Ultrajemné částice generované spalovacím procesem / Ultrafine combustion particles

Sitek, Tomáš January 2018 (has links)
This diploma thesis deals with issues of fine and ultrafine particles formation during thermal decomposition and combustion of biomass. An introduction is devoted to a utilization of biomass as fuel. A following part describes the gas products emerging generally during combustion process. A current emission and air pollution situation in the Czech Republic as well as the health impacts of solid pollutants on human are also mentioned. Within an experimental measurement three basic factors that have impact on fine particles formation during combustion of beech wood (i. e. oxygen content in combustion atmosphere, type of the sample and size of the sample) were thoroughly analyzed. Attention was paid to a progress of thermal decomposition and combustion of sample with respect to the particles formation. Finally, a measurement of fine particles amount was accomplished in a real boiler successively with four different biomass pellet types.
316

Roštový kotel na spalování biomasy / Grate Biomass Boiler

Michalica, Martin January 2018 (has links)
This thesis deals with the design grate boilers with natural circulation for the combustion of contaminated biomass. The boiler output is output 45 t/h. Produced superheated steam with the output parameters of 440 °C 4,2 at MPa feed water temperature 115 °C. The stoichiometric calculations and the thermal calculation are based on the specified fuel composition. Thanks to this, the basic dimensional design of the boiler and its efficiency are determined. Calculation of this work focuses mainly on thermal calculations and dimensional design of individual heat transfer surfaces. Basic drawing of the boiler is available in the attachment of the thesis.
317

Atmosferické zplyňování biomasy s přídavkem kyslíku a vodní páry / Atmosferic gasification of biomass by the addition of oxygen and steam

Vypušťáková, Veronika January 2019 (has links)
The topic of master´s thesis is atmosferic gasification of biomass by the addition of oxygen and steam. The theoretical part is devoted to the description of biomass, process of gasification, kinds of gasification reactor and product gas. Further experiments are devised depending on the gasification medium and output temperature. In this case, the key aspect is the steam addition control. In the practical part, these experiments are performed in a fluidized bed reactor. Resulting values from samples of gas and tar are subsequently processed and evaluated.
318

Roštový kotel na spalování kontaminovaného dřeva / Grate Biomass Boiler

Dražka, Ondřej January 2020 (has links)
The aim of the thesis is a design of a grate steam boiler with capacity of 35 t/h and output steam parameters with temperature 430 °C and pressure 4,1 MPa. The first part of the thesis deals with stoichiometric calculations and boiler efficiency. The theses mainly focuses on the heat transfer calculation and the geometric design of individual heat transfer surfaces. The specifics of fuel are taken into consideration. The drawing of the basic boiler scheme is a part of the thesis.
319

Roštový kotel na spalování dřevní štěpky a kontaminované biomasy 50t/h / Grate Biomass Boiler

Vrána, Jakub January 2020 (has links)
This master thesis deals with design of grate biomass boiler with 50 t/h power. A fuel of the boiler is a mixture of contaminated biomass and woodchips. The boiler produces steam with parameters of 4,2 MPa and 420 °C. Stochiometric and thermal calculations are based on given fuel composition and output steam parameters. Heat exchangers are designated in accordance with the calculations. General drawing of the boiler is attached to this document. Anti-corrosion measures are considered, due to chlorine content in biomass. Hydraulic and aerodynamic losses and dew point of the flue gas is calculated in the end.
320

Návrh ohříváku spalovacího vzduchu / Design of Combustion Air Heater

Kareš, Martin January 2021 (has links)
This diploma thesis is dedicated to the design of a combustion air heater for a biomass boiler with a water content of over 60%. The first part of the thesis describes biomass and its use in energetics. Furthermore, the stoichiometry of combustion, heat transfer in the exchanger, design of dimensions and air pressure losses are calculated. The last chapter describes the method of air heating regulation.

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