Browsing by Author "Zhevzhyk, Oleksandr"
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Item Energy of Low-Temperature Plasma in the Processes of Thermal Conversions of Carboncontaining Medium(IOP Publishing Ltd, 2022) Bulat, Anatolii; Kholiavchenko, Leonid; Oparin, Serhii; Davydov, Serhii; Zhevzhyk, Oleksandr; Potapchuk, IrynaENG: One alternative for solving negative environmental impact is to use alternative renewable energy sources. However, technology is evolving and nowadays it cannot meet the needs of emerging economies. A promising direction in the field of clean technologies is the preliminary preparation of carbon-containing media of various origins by thermoconverting them into a gaseous state in high temperature fields. The analysis of the existing autothermal and allottermic technologies of gasification of carbonaceous media is given in the work. The advantages of allottermic technologies of high-temperature transformations under the action of arc plasma with steam oxidizing medium are presented. This method includes plasma formation processes, which combine in time and space thermal transformations and the generation of oxidant from water. The results of theoretical studies of the carbon-containing media plasma transformation process is presented in the article. The regularities of the temperature of steam-plasma transformation process influence on the qualitative and quantitative indicators of the obtained gas phase taking into account the medium elemental composition are established. Comparison of the cost indicators of production of synthetic motor fuel from natural gas by the known companies and from coal by steam-plasma conversion to gas is carried out.Item Estimation of Usage Efficiency of Freon-Steam Turbines in Mine Energy Complexes(EDP Sciences, 2020) Kirsanov, Mykhailo; Diakun, Inna; Ruban, Vitalii; Skosyriev, Viktor; Zhevzhyk, OleksandrEN: Increase of operating efficiency of mine energy complexes is an actual scientific and technical problem. Systems that utilize energy of low- potential sources and have freon-steam turbines are suggested to be included in mine energy complexes. Principles of selection of freons as working fluids in energy systems are suggested in the paper. Usage of some thermal equations of state for defining thermal and physical properties of freons is analyzed. Equation of isentropic process for the thermal Redlich–Kwong equation of state is obtained. Calculation of energy efficiency of a system with a freon-steam turbine for selected variants of usage of working fluids is performed. A calculation method of thermodynamic parameters that are necessary for energy conversion efficiency estimation of specific freons in a system of useful utilization of energy is developed. Analysis of results indicates that usage of ozone-safe and fire-safe freons in energy utilization systems of low-potential sources with a possibility of utilization of additional waste heat, which was not used in the past, allows increasing the operating efficiency of mine energy complexes.Item Mathematical Modeling of Heating of Coal Particle Within the Space between Electrodes of Arc-Heating Reactor(EDP Sciences, 2020) Zhevzhyk, Oleksandr; Kholiavchenko, Leonid; Davydov, Serhii; Potapchuk, Iryna; Kabakova, Liudmyla; Gupalo, Olena V.; Pertsevyi, Vitalii; Morozova, NataliiaEN: A mathematical model of heating of coal particles that move in the initial section of a submerged gas jet within the space between electrodes of reaction chamber of arc-heating reactor is created. The model takes into account convective heat transfer and heat transfer by radiation from a sphere (particle) – circle (anode) system. The temperatures of particles on mechanical trajectory are obtained depending on particle diameters and the initial coordinate of nozzle leaving.