SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 12: Poster I

MM 12.2: Poster

Monday, March 27, 2023, 18:15–20:00, P2/OG1+2

Chlorine Corrosion of Superheater Steels — •Matthias Kroh, Sebastian Pentz, Ferdinand Haider, and Georg Krupkov — Univ. Augsburg, Inst. f. Physik, 86159 Augsburg

During combustion in waste-incineration-plants a variety of chemical substances are released into the gas stream. Especially under the environment present in an incineration plant the active Chlorine-catalysed high temperature corrosion caused by released Cl2 and HCl proves detrimental to the lifetime of heat exchanger tubes, which are essential for the power production. According to literature, Cl2 is far more corrosive than HCl, but these studies were rather qualitative and do not reflect conditions like e.g. in a real power plant To simulate this process in a laboratory environment with realistic Cl-concentrations, a Chlorine generator was designed, which produces Cl2 from a reaction of liquid NaOCl and H2SO4. The formed Chlorine concentrations were quantified via GCMS and UV VIS spectrometry to produce Cl2 concentrations akin to those in real plants. In these experiments the corrosional attack of Cl2 and of HCl on samples of a typical superheater steel was determined for various temperatures and defined gas atmospheres. Especially the influence of water and sulfur dioxide in the gas atmosphere were studied. The experimental setup is based on a horizontal furnace, containing the samples in a quartz tube, exposed to a flow of the desired gas atmosphere, and a subsequent gas analysis. Weight loss of the samples after removing reaction products as well as the morphology of the reaction zone are determined after various exposure times.