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MM: Fachverband Metall- und Materialphysik
MM 49: Structural Materials (Steels, light-weight materials, high-temperature materials) - I
MM 49.4: Vortrag
Donnerstag, 19. März 2020, 11:00–11:15, BAR 205
Effect of additive materials on chlorine induced high temperature corrosion in waste-to-energy plants — •Sebastian Pentz1, Ferdinand Haider1, and Ragnar Warnecke2 — 1Univ. Augsburg, Inst. f. Physik, 86135 Augsburg — 2Gemeinschaftskraftwerk Schweinfurt GmbH, 97424 Schweinfurt
High temperature corrosion leads to massive problems especially in waste-to-energy-plants. At prevalent temperatures around 400∘C-600∘C, corrosion is mainly chlorine induced. A local release of chlorine through sulfation reaction of solid alkali chlorides is mainly responsible for the supply of chlorine at metallic components like superheaters. This reaction requires an atmosphere containing SO2, H2O, O2 and releases HCl/Cl2. Sulfates thereby generated could in combination with deposited chlorides lead to low melting eutectics in the deposit concluding in an acceleration of the corrosion process. A strategy with good prospects could be the application of additive materials in order to confine the chloride deposition. In this work the absorbing mechanism of clay minerals is examined. The additive kaolinite enables the incorporation of alkalis like Na or K. Hereby chlorine is released as gaseous HCl leading to less condensation of NaCl/KCl. Hence chlorine enrichment in the deposits can be reduced. Principles of the reaction conditions in waste-to-energy-plants, especially at the superheater tubes, are investigated and laboratory experiments regarding the encapsulation of alkalies into clay minerals, the kinetics of sulfation reactions and the corresponding chlorine attack are evaluated.