Corrosion Mechanism of Alloy 310 Austenitic Steel beneath NaCl Deposit under Varying SO2 Concentrations in an Oxy-fuel Combustion Atmosphere
| Autor: | Günter Scheffknecht, Jörg Maier, Manoj Paneru, Gosia Stein-Brzozowska |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Alloy Metallurgy Oxide Energy Engineering and Power Technology chemistry.chemical_element engineering.material Combustion Alkali metal Chloride Corrosion Metal chemistry.chemical_compound Fuel Technology chemistry visual_art visual_art.visual_art_medium engineering medicine Chlorine medicine.drug |
| Zdroj: | Energy & Fuels. 27:5699-5705 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/ef4005626 |
| Popis: | Alkali chlorides and sulfates are well-known corrosive species found on superheater and reheater boiler tube deposits. The corrosivity of alkali chlorides toward Fe–Cr alloys is connected to the formation of molecular chlorine at the oxide surface. Chlorine can accelerate metal oxidation, establishing a self-sustained cyclic process of metal chloride and metal oxide formation, a corrosion phenomenon referred to as “active oxidation”. In the convective zone of a boiler, chlorine can be released by either sulfation of alkali chlorides by SOx or reaction of alkali salts (NaCl/KCl) present in deposits on heat-exchanger surfaces with metal and/or their oxides or both. To minimize the possible risk of corrosion induced by alkali chlorides, conversion of these chlorides to sulfates is discussed as an attractive solution. The aim of this study is to evaluate the influence of higher SO2 concentrations, during oxy-fuel combustion, on in-deposit sulfation of chloride salts and related corrosion mechanisms. To signif... |
| Databáze: | OpenAIRE |
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