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PhD topics for academic year 2019/2020

Department of Gaseous and Solid Fuels and Air protection

Chemical Processing of Fuels and Energetics

Study Programme: Chemistry and Technology of Fuels and Environment

CO2 removal from flue gas using low temperature adsorption

Ciahotný Karel, doc. Ing. CSc. ( cia...@vscht.cz)
Kyselová Veronika, Ing. Ph.D. ( Ver...@vscht.cz)
In the framework of the work will be developed a special modified adsorption materials using impregnating agents with high affinity to the CO2 (e.g., org. amines). Prepared adsorbents will be tested first in laboratory scale for the adsorption of CO2 from gaseous mixtures. Various methods of regeneration of saturated adsorbent will be also investigated. Adsorbents with high sorption capacity to the CO2 in repeated cycles of ad- and desorption will subsequently tested for the CO2 removal from flue gas in pilot scale using real flue gas produced by the coal combustion.

Determination of the composition of natural gas using Raman spectroscopy

Hlinčík Tomáš, doc. Ing. Ph.D. ( Tom...@vscht.cz)
Natural gas contains hydrocarbon and inert components which can be commonly determined using gas chromatography. Utilization Ramana spectroscopy for analysis of substances contained in the natural gas has not been more widely studied and the use of spectral methods has great potential in the future compared with chromatographic methods. The aim of this work is the study of qualitative and quantitative analysis of the components of natural gas using Raman spectroscopy.

Heavy metals removal from flue gas produced during combustion of coal

Ciahotný Karel, doc. Ing. CSc. ( cia...@vscht.cz)
Kyselová Veronika, Ing. Ph.D. ( Ver...@vscht.cz)
The work is focused on testing of adsorbents suitable to the mercury removal from the flue gases produced by the brown coal combustion. The goal is to find the optimal adsorbents to allow effective removal of mercury from power plant flue gases produced by combustion of the Czech Brown, to estimate their adsorption capacities for mercury under the conditions of power plant flue gas adsorption (high temperature and high humidity) and the possibility of the eventual regeneration of saturated adsorbents. The work is part of the grant project TACR.

Influence of hydrogen in natural gas on the gas infrastructure

Hlinčík Tomáš, doc. Ing. Ph.D. ( Tom...@vscht.cz)
Tenkrát Daniel, Ing. Ph.D. ( ten...@vscht.cz)
The thesis is focused on the study of different hydrogen content in natural gas and its influence on the gas infrastructure. At present, hydrogen is intended to be added to natural gas either as a pure gas or for example as a part of the gas produced by the catalytic hydrogenation of carbon dioxide. The issue of adding hydrogen to natural gas involves, in particular, mixing of hydrogen with natural gas in the pipeline system, influence on the calorific value and combustion properties, influence on the measuring and analytical systems, sealing systems, influence on natural gas compression at compressor stations, reduction of transport capacity, reduction of methane number or limiting factors during the storage of hydrogen - natural gas mixtures.

Leaks flanged connections for various gaseous media

Hlinčík Tomáš, doc. Ing. Ph.D. ( Tom...@vscht.cz)
Tenkrát Daniel, Ing. Ph.D. ( ten...@vscht.cz)
The thesis is primarily focused on the study of gas leakages through flange connections for helium systems in the concept of the IV. generation nuclear reactors. Nevertheless, part of the work will focus also on testing leakages of other gaseous media, especially natural gas or hydrogen. Except gas leakage testing over different sealing materials, penetration tests of permanent gases into the piping system under increased pressure and elevated temperatures will be executed.

Materials for high temperature systems

Ciahotný Karel, doc. Ing. CSc. ( cia...@vscht.cz)
Berka Jan, Ing. Ph.D. ( jan...@vscht.cz)
he nuclear generation IV reactors are considered to replace older energy producing devices in the future. Several types of generation IV reactors are proposed. In two types of them - High Temperature reactor (HTR) and Gas Cooled Fast Reactor (GFR) helium as a coolant is used. Pressure and temperature of helium in these types of reactors reache very high values - to 16 MPa and 1000°C, and higher temperatures are planned for the future to achiveve higher effectivity for gonversion of thermal to electrical energy. This environment may damage components of the system, therefore structural materials have to be as resistant as possible. Structural materials for HTR a GFR may be distinguished into two types: metallic and nonmetallic. Among metallic materials for HTR belong mainly high tempemperature resistant steels and metal alloys. On metallic materials the tests of high temperature creep (constant strain) and fatigue (dynamic strain) resistance, corrosion in impure helium, etc. should be performed. Nonmetalic materials used in HTR are mainly nuclear graphite and composite materials. These materials should be tested for oxidation in impure helium, creep, dimensional and structural changes at high temperatures under and without radiation, etc.
Development principles: 1. Vypracujte literární rešerši zaměřenou na téma: Koknstrukční materiály plynem chlazených reaktorů (zaměřte se hlavně na materiály používané pro konstrukci heliem chlazených HTR a GFR reaktorů), testování těchto materiálů v plynném prostředí za vysokých teplot a vliv prostředí plynného chladiva na vlastnosti materiálů při vysokých teplotách při i bez současného působení radioaktivního záření, poslední trendy v oboru vysokoteplotních materiálů. 2. Ná základě získaných vědoností navrhněte typy materiálů a testy, kterým by měly být tyto materiály podrobeny. Předpokládá se, že půjde o testování koroze materiálů v peci v prostředí helia obsahujícího nečistoty typické pro systémy HTR v koncentracích v řádu jednotek a ž stovek ppm. Testy budou provedeny bez vlivu radioaktivního záření. 3. Proveďtte experimenty, vyhodnoťte a porovnejte výsledky testů vlastností materiálů v prostředí helia obsahujícího nečistoty. Srovnejte s údaji publikovanými v literatuře, jsou-li k dispozici, formulujte závěry.

Removal of acidic components of the energetic gas above the dew point of tars

Ciahotný Karel, doc. Ing. CSc. ( cia...@vscht.cz)
Pohořelý Michael, doc. Ing. Ph.D. ( poh...@vscht.cz)
Gas produced by the thermochemical conversion of carbonaceous materials contains impurities causing several problems when the gas is used for the production of electric energy or alternative gaseous or liquid fuels or chemical commodities. The work is focused on designing and verifying the concept of removal of sulphur compounds and hydrogen halides from the pyrolysis gas and producer gas at higher temperatures (>350°C).

Study of the Claus and Sulfreen processes

Ciahotný Karel, doc. Ing. CSc. ( cia...@vscht.cz)
Machač Pavel, Ing. CSc. ( mac...@vscht.cz)
For measurement of absorption processes are a wide range of laboratory equipment. Preferably bouble column reactors in our case is the possibility of measuring chemisorption of SO2 at various conditions. The work is focused on the experimental verification of the influence of additives based on organic, respectively. other additives for sorption of SO2 from flue gas in the model limestone slurry. Sampling and physical conditions is such that it is possible to approach the conditions of an industrial process or conditions prevailing in the Czech power station blocks equipped with wet limestone desulfurization technology.
Development principles: 1. Vypracujte literární rešerši na zadané téma 2. Experimentálně ověřte parametry, které ovlivňují sorpční děj 3. Sestavte rovnice popisující sorpční pochod v daných experimentálních podmínkách 4. Vyhodnoťte reprodukovatelnost měření.
Updated: 17.2.2017 13:52, Author: Miroslav Šimek

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