Кафедра екології, теплотехніки та охорони праці (ДМетІ)

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ENG: The department of Ecology, Heat-Transfer and labour protection (DMetI)

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Selection Criteria of Working Pairs Adsorbent – Adsorbate for Thermal Energy Transformers
(MM Science Journal, Czech Republic, 2022) Rimar, Miroslav; Sukhyy, Kostyantyn M.; Belyanovskaya, Elena; Yeromin, Oleksandr O.; Prokopenko, Elena M.; Kulikov, Andrii; Fedak, Marcel; Frolova, Lilia; Pustovoy, Grigoriy; Kulikova, Olha; Savko, Vitalii
ENG: In the manuscript the main factors that affect the thermal mass of open and closed types of heat storage devices are shown. Also, the main requirements for adsorption modules are given. The calculation procedure has been refined, which includes the determination of heat load, heat of adsorption, adsorbent mass, as well as integral, structural, and specific thermal mass. The specific thermal masses of adsorption heat-accumulating modules of open and closed types were evaluated. The main factors affecting their value are analysed. It is shown that the specific thermal mass of the adsorption heat storage module increases significantly due to the adsorption of water during the discharge of the device. It is shown that it reaches its maximum values at the end of the discharge stage, when the maximum values of adsorption in the cycle are reached. The influence of the design of the heat storage module on the value of the specific thermal mass has been confirmed. It is shown that the maximum values of these changes correspond to the composites containing 80% salt and 20% silica gel, due to the maximum values of the limiting adsorption and the heat of adsorption, which contributes to the lower values of the adsorbent mass, which is required to cover the thermal load. Specific thermal masses of adsorption modules based on "silica gel – sodium sulphate" and "silica gel - sodium acetate" composites are compared. The composition of the composite is 80% sodium sulphate and 20% silica gel, which corresponds to the minimum dimensions of the adsorption module, and therefore the maximum value of the specific thermal mass.
Technological Aspects of Purification and Separation of Hydrogen-Containing Gases Obtained by Gasification of Solid Carbon-Containing Media
(M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Dnipro, 2025) Shevchenko, Volodymyr; Oparin, Serhii; Davydov, Serhii; Gupalo, Olena V.
ENG: Іn this paper, the subject of study is the processes of purification and separation of hydrogen-containing gases obtained by plasma-chemical gasification of solid carbon-containing media. The work aims to establish the regularities of the influence of technological parameters of hydrogen-containing gases obtained by the gasification of solid carbon-containing media on the specific surfaces of filter partitions, membranes, and adsorbents used for their purification and separation. The graph-analytical research method is used in this work, which consists in finding rational specific surfaces of the processes of purification and separation of hydrogen-containing gases based on the obtained graphical dependencies. Analytical dependencies for calculating the specific surface areas of the filter partition, the membrane, and the adsorbent were established. These dependencies take into account the technological parameters of hydrogen-containing gases and the technological parameters of their separation to produce high-purity hydrogen. Based on the theoretical calculation results, a graphical dependence of the specific surface area of the filter partition on the temperature of hydrogen-containing gases formed during the gasification of solid carbon-containing media and the concentration of solid particles in the gas was obtained. This dependence shows that an increase in the concentration of solid particles and an increase in the temperature of hydrogen-containing gases lead to an increase in the specific surface area of the filter partition. The graphical dependence of the specific surface area of the polyimide membrane on the operating pressure and hydrogen concentration in the permeate and the graphical dependence of the specific surface area of zeolite 13X on the initial hydrogen concentration in the initial gas mixture from 60% to 90% at a final concentration of 99.99% are presented. The paper presents a schematic diagram of purification and separation of hydrogen-containing gases to produce high-purity hydrogen. According to the diagram, the hydrogen-containing gas obtained by the gasification of carbon-containing media is sent for purification from solid particles to a filtration system, from where it is supplied to membrane separation for concentration, and the concentrated hydrogen-containing gas is sent to adsorption separation, where it is separated to produce high-purity hydrogen.