Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.12: Poster
Monday, March 7, 2016, 18:00–20:00, Poster B3
Sulfation kinetics of high temperature corrosion in waste to energy plants — •Daniel Ott1, Ferdinand Haider1, and Ragnar Warnecke2 — 1Univ. Augsburg, Inst. f. Physik, 86135 Augsburg — 2Gemeinschaftskraftwerk Schweinfurt GmbH, 97424 Schweinfurt
High temperature corrosion leads especially in waste-to-energy-plants to massive problems. At prevalent temperatures around 500∘C-600∘C corrosion is mainly chlorine induced. Responsible for the supply of chlorine at heat exchangers like superheaters or boiler walls is in majority a local release of chlorine through sulfation of solid alkali chlorides.
This reaction requires an atmosphere containing SO2, H2O, O2 and releases HCl/Cl2. In this work we present results for the reaction kinetics, which depends on different parameters, like temperature, gas stream, gas components or (catalytic)additives. The conversion rate is strongly dependent on the transformation of SO2 to SO3, which is catalyzed by the presence of iron and iron oxides. In parallel to the study of the reaction rate it is possible to characterize the loss of metall simultaneously. Furthermore the behaviour of chlorine during the process of the corrosion was investigated. Investigations (theoretical and practical) of real superheater deposits were conducted for a better understanding of the predominant reactions and comparability of laboratory experiments. Principles of the prevalent conditions and reactions in waste-to-energy-plants, especially at the superheaters, are shown and experiments regarding the kinetics are presented.
Project supported by: BMBF - MatRessource, project: VOKos