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MM: Fachverband Metall- und Materialphysik

MM 3: Development of Computational Methods: Evaporation, Growth and Oxidation – Density Functional, Tight Binding

MM 3.2: Talk

Monday, March 27, 2023, 10:30–10:45, SCH A 251

High temperature chlorine corrosion in waste-to-energy-plants: sulphation of chloride particles as source of released chlorine — •Sebastian Pentz, Matthias Kroh, and Ferdinand Haider — University of Augsburg, Chair for Experimental Physics I, Universitätsstr. 1, 86159 Augsburg

Chlorine induced high temperature corrosion leads to massive problems especially in waste-to-energy-plants. During the combustion process chloride containing particles are released and deposited on heat exchanger surfaces. There chlorides get converted into sulphates with a release of chlorine species which then lead to severe corrosion. For chloride particle sampling from a plant a tempered probe was developed, allowing time series of deposit built-up at defined temperatures. From this online particle sampling during plant operation we collect information about sticking probability, size distribution of deposited particles and the chemical composition of the deposit built up. Especially the relation between detected chlorine to sulphur is of high interest, leading to the degree of conversion of deposited chlorides, which equals the amount of released chlorine. In further laboratory experiments the sulphation process of synthetic chloride particles can be systematically studied. From this we get the sulphation kinetics under various conditions like temperature, particle size or gas composition, which lead to an estimation of the time required for full chloride conversion. By combining the results gained from laboratory experiments, online particle sampling and offline deposit analysis, we try to model the ongoing sulphation process.