Browsing by Author "Tuttlies, Ute"

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    Electrically heated oxide ceramic tubes for high temperature reactions
    (2023) Matthies, Jörn; Schall, Thomas; Pritzkow, Walter; Tuttlies, Ute; Nieken, Ulrich
    Endothermic high temperature reactions are usually carried out in metal tubes heated by gas burners. Electrical heating allows substantial reduction of CO2 emissions. We propose the usage of a composite tube, where a thin metallic layer is embedded between an inner and outer ceramic layer. While monolithic ceramics suffer from brittleness and low tolerance to thermal stress, only the inner layer is made from monolithic ceramics, while the outer layer is made of fiber reinforced oxide ceramics. In first tests the hybrid ceramic tube was electrically heated to 1250 °C with a maximum heat release of 85 kW m-2.
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    Experimental analysis of inductive heating of catalytic beds
    (2024) Kleschew, Daniel; Tuttlies, Ute; Nieken, Ulrich
    To reduce CO2 emissions in the chemical industry, already established endothermic reactors should be heated with electrical energy. One promising possibility is inductive heating, in which electrical energy can be transferred to the susceptor (material to be heated). The uniform heating of the susceptor material is necessary for stable operation in chemical reactors and is therefore investigated in this work. For this purpose, a non‐reactive test setup was built that enables the investigation of inductive heating of different susceptor materials and measurement of the temperature distribution under defined non‐reactive conditions. In the first tests, temperatures of up to 800 °C were reached and an uneven heat input in a bed of stainless‐steel rings was observed.
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    Katalytischer Brenner für ein wärmeintegriertes Motorabgasreinigungssystem
    (2008) Nieken, Ulrich; Eigenberger, Gerhart; Tuttlies, Ute; Bernnat, Jens
    Inhalt dieses Projektberichts sind Arbeiten zur Entwicklung und Erprobung von Dieselbrennersystemen, die als aktives Regelelement in wärmeintegrierten, multifunktionalen Dieselabgasreinigungssystemen eingesetzt werden sollen.