This thesis describes the production of biogas and subsequent enrichment methods thus obtained biogas to natural gas quality. The reason is the efficient use of natural resources to address the energy needs of mankind. Should be answered the main question. The method of biogas to biomethane enrichment economically viable ? The answer should be obtained from each successive calculations and economic calculations.

The thesis deals with modeling and forecasting of natural gas spot prices, con- sumption of natural gas and average daily temperature. We assume that these three variables are influenced by each other, because as temperature decreases, consumption increases, which in turn increases the price with the increasing de- mand. Therefore, we propose to model these variables by vector autoregression. We compare this model with one-dimensional models where for each one we build a model from the ARMA-GARCH class. Models are estimated using historic va- lues and then designed models are used to simulate scenarios. Analysis of scenarios provides information to gas supply companies estimates of portfolio consumption and financial flows related to the purchase concerning natural gas. 1

Práce se zabývá stavem zásob ropy a zemního plynu v EU a vzrůstající závislostí EU na jejich dovozech. Dále mapuje evropskou energetickou politiku a její problémy jako závislost na ruských dovozech ropy a zemního plynu, nejednotný postoj zemí EU k energetické politice, stávající trasy ropovodů a plynovodů, růst světových cen těchto surovin a problémy ekologické. Analyzuje rovněž vnější vztahy EU s nejdůležitějšími partnery v oblasti energetiky a legislativní akty EU, které byly k tématu energetické politiky vydány.

Diplomová práca sa zameriava na súčasné a projektované trasy produktovodov z Ruska a kaspického regiónu do EÚ.Popisuje výhody a nevýhody jednotlivých projektov z ekonomického, politického a sčasti technického hľadiska. Zároveň pojednáva o pravdepodobnom vývoji závislosti EÚ na ruskej rope a zemnom plyne v časovom vymedzení do roku 2030.

This diploma thesis determines potential benefit of shale gas and its influence on price of gas on European market. For this purpose was chosen two variants, which have the best chance to decrease price of gas on European market. The first variant is extraction of shale gas directly in Europe. The size of deposits and cost estimates indicates the biggest potential from both variants. Possible extraction could be able to decrease significantly price of gas on European market. Nevertheless the present attitude of Europe to extraction can limit this potential. The second variant is import of LNG, which have already helped to decrease price of gas significantly in many European countries. Nevertheless its possible influence on price decline of gas is limited. Expenditures connected with LNG prevent to greater price decline on the possible level of extraction. Moreover Europe has to face to great competition from Asia, where considerable part of gas supply move to. Final benefit of LNG will depend mostly on the size of available supply.

The aim of the thesis is to describe structural changes in the U.S. natural gas industry after implementation of hydraulic fracturing method which exploit natural gas from shale. In order to provide a complex description; environmental, market impacts and political interests are taken into consideration. Consequently, cluster analysis looks for a change in relations among various factors arising on the market. Tested periods are carefully chosen according to market events and results of statistical tests. One may conclude, it is a complexity of market, technology improvement and government behaviour which influence natural gas industry in USA.

This thesis deals with storage of natural gas in hydrates, forming of hydrate, its transportation and storage. Within the calculation part, three hydrate forming reactors are compared. According to the paramters used in the calculations, a reactor is designed. Basic drawing documentation is also available. The final calculations focus on the nominal evaporation of the storage tank.

This master's thesis deals with the integration of a mine gas burning cogeneration unit into industrial power system. The aim of the thesis is to design and evaluate different possibilities of integration the cogeneration unit into industrial power system. The first, theoretical part of the thesis discuss about cogeneration (combined heat and power). The technologies used for cogeneration are summed up as well as the possibilities of usage. The next part deals with the mine gas as the fuel for the cogeneration units. The lasts chapters of the theoretical part talks about terms for installation power source into industrial power system and about the possibilities of overflow of the electricity into distribution power system. The practical part deals with the installation of the 600 kW cogeneration unit into particular industrial power system. Four possibilities of operation mode of the cogeneration unit are design. At the end of the thesis the brief economical evaluation is accomplished.

The diploma thesis includes proposals suitable for usage of the technologies for clearing the biogas into a quality of substitute natural gas (SNG). The most suitable technology is chosen for the clearing the biogas out of the septic tanks of the laboratory for biologically decomposable waste treatment at Institute of process and environmental engineering. There is a calculation , a proposal and a realisation of the experimental unit for clearing the biogas performed.

The diploma thesis focuses on the influence of combustion of CNG fuel and the production of exhaust emissions at a passenger car engine. At the beginning of the thesis are presented the possibilities of using fuel in vehicles. Then there will be described the CNG fuel itself, its advantages and disadvantages and there will be comparison with petroleum-based fuels. Next will be described necessary modifications of the engines and modifications of the related systems to make combusting of CNG possible, also summarize the theoretical knowledge of the possible effects on the output ecological parameters of the engines. These theoretical knowledges were verified by measuring the actual emission parameters of the engine of a real vehicles Skoda Octavia III Diesel and G-TEC. At the end of this thesis are measured values evaluated. Evaluation confirmed, that vehicles, which uses as fuel CNG, reaches lower emission than vehicles that are using convention oil-based fuels.