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Applicability of polyimide membranes for air separation in oxy-MILD power plants: semi-experimental research

Remiorz Leszek, Wiciak Grzegorz, Grzywnowicz Krzysztof, Janusz-Szymańska Katarzyna

Journal of Power Technologies

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2021

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Vol. 101, nr 1

44--53

EN

The paper presents the results of experimental and computational research concerning the parameters of the separation process of N2/O2 mixture, regarding the composition of ambient air, using capillary polyimide membranes. The analysis focused on the potential applicability of polyimide membranes in oxy-MILD combustion units. The experimental data, collected using a sophisticated experimental test stand, was used to approximate continuous functions, describing the dependencies of essential parameters of the air separation process on variable operational conditions. These functions were used as fundamental blocks to develop a complete mathematical model of the membrane separation unit (MSU), including polyimide membranes and additional equipment, intended for use within oxy-MILD power generation units. Computational research was performed for three variants of MSU unit configuration, including: serial connection of membrane modules, multiple retentate recirculation and multiple permeate recirculation. Results, presented in the form of characteristic curves of investigated dependencies, indicate that the highest parameters of the separation process were gained for serial connection, whereas the lowest were for permeate recirculation. The collected data suggests that retentate recirculation might be beneficial for specific conditions, with limited application for continuous operation.

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Reduction of carbon footprint from spark ignition power facilities by the dual approach

Janusz-Szymańska Katarzyna, Grzywnowicz Krzysztof, Wiciak Grzegorz, Remiorz Leszek

Archives of Thermodynamics

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2021

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Vol. 42, no 2

171--192

EN

Power generation units, suitable for individual users and small scale applications, are mainly based on spark ignition engines. In recently performed research, reductions of emissions coming from such units, especially considering carbon dioxide emissions, are deemed as the issue of particular importance. One of solutions, postponed to reduce impact of spark ignition engine-based units on the natural environment, is transition from fossil fuels into renewable gaseous fuels, as products of organic digestion. Nonetheless, development of new solutions is required to prevent further carbon dioxide emissions. The paper presents a novel dual approach developed to reduce carbon dioxide emissions from stationary power units, basing on spark ignition engine. The discussed approach includes both reduction in carbon content in the fuel, which is realized by its enrichment with hydrogen produced using the solar energy-supported electrolysis process, as well as application of post-combustion carbon dioxide separation. Results of the performed analysis suggest profitability of transition from fossil into the hydrogen-enriched fuel mixture, with significant rise in operational parameters of the system following increase in the hydrogen content. Nevertheless, utilization of the carbon dioxide separation leads to vital soar in internal energy demand, causing vital loss in operational and economical parameters of the analyzed system.

3

Wychwyt wodoru z gazu ziemnego przy użyciu technologii membranowych

Janusz-Szymańska Katarzyna, Kotowicz Janusz

Rynek Energii

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2020

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Nr 5

33--37

PL

W światowej energetyce coraz większe znaczenie mają metody magazynowania energii. Jedną z takich metod magazynowania energii jest produkcja/wydzielanie wodoru i jego dalsze wykorzystanie, zwane technologią Power-to-Gas. W najbliższym czasie, bez wysokosprawnych, niezawodnych i tanich rozwiązań w zakresie magazynowania energii, energetyka, zwłaszcza w Polsce, może stanąć przed znaczącymi problemami związanymi z ochroną klimatu i ograniczeniem emisji gazów cieplarnianych do atmosfery, jak również przed zwiększeniem wykorzystania odnawialnych źródeł energii. W artykule przedstawiono możliwości wykorzystania technologii membranowej w procesie pozyskiwania wodoru jako paliwa po jego zmagazynowaniu. Technologia separacji membranowej może być wykorzystywana do separacji mieszanin różnych gazów, np. H2, O2, CO, CO2 czy CH4. W pracy przedstawiono wybrane zagadnienia analizy procesu separacji wodoru z mieszaniny z gazem ziemnym w porównaniu do technologii opartej o procesy adsorpcyjne.

EN

Energy storage methods are becoming increasingly important in the global energy industry. One of such methods of energy storage is the production / evolution of hydrogen and its further use, called the Power-to-Gas technology. In the near future, without highly efficient, reliable and cheap energy storage solutions, the energy sector, especially in Poland, may face signif-icant problems related to climate protection and reduction of greenhouse gas emissions to the atmosphere, as well as in-creasing the use of renewable energy sources. The article presents the possibilities of using membrane technology in the process of obtaining hydrogen as fuel after its storage. The membrane separation technology can be used to separate mixtures of various gases, such as H2, O2, CO, CO2 or CH4. The paper presents selected problems of the analysis of the hydrogen separation process from a mixture with natural gas in comparison to the technology based on adsorption processes.