Samuel KUKURA alumni student
MSc. study 2021 - 2023
Supervisor: Karol Hensel Consultant: -- Title: Electric discharges in ceramic monoliths Abstract: The diploma thesis focuses on the generation of electrical discharges in ceramic monoliths with a honeycomb-like structure, called honeycomb monoliths, in atmospheric air using direct current voltage. The main objective of the thesis is to observe the physical and chemical properties of these discharges and to find conditions for their stable generation. For this purpose, the discharge is generated in various settings and configurations, including different electrode distances, airflow rates, voltage polarities, with and without the honeycomb monolith. Oscilloscope measurements, digital photography, and absorption spectrometry are used for the observation and analysis of discharge properties. The thesis is divided into two parts: theoretical and practical. The theoretical part deals with the topic of atmospheric pollutant formation, theoretical foundations of electrical discharge generation, and description of basic configurations of electrical discharges in ceramic structures. The practical part includes a description of the apparatus and measurement methodology, followed by the presentation of measurement results and discussion. The results showed that the properties of electrical discharges in honeycomb monoliths strongly depend on the electrode distance and the capillary density of the honeycomb monolith. Decreasing the electrode distance and increasing the capillary density resulted in increased stability and homogeneity of the discharge, as well as its chemical activity. Changing the voltage polarity altered the discharge regime, with a streamer regime dominating in the positive polarity and a pulseless regime in the negative polarity. Airflow rate affected the chemical activity of the discharge, with the highest concentrations of products observedetthe lowest airflow values. Ozone and nitrogen oxide were the products of the chemical activity of the discharge in all configurations and conditions.
Bc. study 2020 - 2021
Supervisor: Marcela Morvová Consultant: -- Title: The use of pyrolysis and gasification with exhaust cleaning as a waste management method Abstract: The presented bachelor thesis deals with the topic of the disposal of greenhouse gases from pyrolysis and gasification processes, to optimize them for environmentally beneficial waste management processes. The introduction to the theoretical part presents the current issues of waste management and its state around the world and in Slovakia. The topic is followed by an overview of pyrolysis and gasification as innovative methods for waste management. The conclusion of the theoretical part is devoted to the characteristics of currently available options for solving global warming in the form of eliminating emissions from exhaust streams. The main part of the bachelor thesis introduces a combined system that is designed to dispose of CO2 from pyrolysis gases. To reduce greenhouse gases, we use equipment for discharge and electrolysis, which is supplemented by a system that condensates water vapor from flue gases. The planned measurements are also included with the description of the proposed system, which must be performed to optimize the system and at the same time to analyze the electrochemical processes that will take place during it.
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Active
PhD students:
Jana KŠANOVÁ
Darina KUŽMOVÁ
Ramin MEHRABIFARD
Zuzana OKRUHLICOVÁ
Pankaj PAREEK
Gokul SELVARAJ
Sergei SMIRNOV
Peter TÓTH
MSc/Bc students:
Dominik DIŇA
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