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  • 1.
    Alipour, Yousef
    et al.
    KTH Royal Institute of Technology, Sweden.
    Talus, Annika
    RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
    Henderson, Pamela
    KTH Royal Institute of Technology, Sweden; Vattenfall AB, Sweden.
    Norling, Rikard
    RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
    The effect of co-firing sewage sludge with used wood on the corrosion of an FeCrAl alloy and a nickel-based alloy in the furnace region2015In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 138, p. 805-813Article in journal (Refereed)
    Abstract [en]

    The effect of digested sewage sludge as a fuel additive to reduce corrosion of furnace walls has been studied. The nickel base alloy Alloy 625 and the iron-chromium-aluminium alloy Kanthal APMT™ were exposed for 14.25. h at the furnace wall in a power boiler burning 100% used (also known as waste or recycled) wood. The test was then repeated with the addition of sewage sludge to the waste wood. The samples were chemically analysed and thermodynamically modelled and the corrosion mechanisms were investigated. The results showed that the co-firing of sewage sludge with recycled wood leads to a reduction in the corrosion. Attack by a potassium-lead combination appeared to be the main corrosion mechanism in Alloy 625 during waste wood combustion, while attack by alkali chloride was found to be dominant in APMT alloy.

  • 2.
    Talus, Annika
    et al.
    RISE, Swerea, KIMAB.
    Alipour, Y.
    KTH Royal Institute of Technology, Sweden.
    Norling, Rikard
    RISE, Swerea, KIMAB.
    Henderson, P.
    KTH Royal Institute of Technology, Sweden; Vattenfall AB, Sweden.
    Effect of sewage sludge addition on initial corrosion of 16Mo3 and 310S when exposed in a used wood fired boiler2016In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 67, no 7, p. 683-692Article in journal (Refereed)
    Abstract [en]

    With an expanding use of low quality bio fuels, corrosion problems on water wall tubes are increasing. In this study, the possible corrosion reducing effect when adding digested sewage sludge to the fuel in a used wood (also known as waste or recycled wood) fired furnace has been evaluated. The low alloyed steel 16Mo3 and the stainless steel 310S were exposed for 14.25 h at the furnace wall position when firing only used wood and used wood with sewage sludge additions. The exposures were performed in a bubbling fluidized bed boiler and the metal temperature of the test samples was controlled to 350 °C. Chemical analysis of the deposits and microscopic evaluation of the metallic samples showed reduced amount of alkali metals and chlorine in the deposit together with reduced initial corrosion for both materials when co-firing with digested sewage sludge. In the corrosion process, metal chlorides were formed for both materials when firing only used wood, iron chlorides for the low alloyed steel, and chromium chlorides for the stainless steel. When co-firing with sewage sludge, this behavior was suppressed.

  • 3.
    Yuan, Kang
    et al.
    Linköping University, Sweden.
    Lin Peng, Ru
    Linköping University, Sweden.
    Li, Xin-Hai
    Siemens Industrial Turbomachinery AB, Sweden.
    Talus, Annika
    RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
    Johansson, Sten
    Linköping University, Sweden.
    Wang, Yan-Dong
    University of Science and Technology, China.
    Hot corrosion of MCrAlY coatings in sulphate and SO2 environment at 900°C: Is SO2 necessarily bad?2015In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 261, p. 41-53Article in journal (Refereed)
    Abstract [en]

    MCrAlY coatings can be corroded due to the basic fluxing (type-I hot corrosion) of the supposed-to-be protective alumina scale in a molten sulphate environment. In this study, two MCrAlY coatings, coating A (10wt.% Al, 20wt.% Cr) and coating B (7wt.% Al, 28wt.% Cr), were tested in 48-hour cycles at 900°C in a sodium-potassium sulphate environment with and without SO2 (500ppm). The aim was to study the effect of SO2 at the typical type-I-hot-corrosion temperature-900°C. The results showed that the corrosion behavior of the MCrAlY coatings depended not only on the coating composition but also on the corrosion environment. It was found that in coating A alumina scale was more resistant in the sulphate-plus-SO2 condition than that in the sulphate-only condition. Such phenomenon indicated a beneficial effect of SO2. On Coating B, however, mixed oxide layers, consisting of alumina and other oxides and sulfides, formed after a certain number of cycles in the sulphate environments with or without SO2 gas. In this coating, the addition of SO2 in the sulphate environment promoted the formation of non-dense chromia oxides which may form from oxidation of Cr-sulfides.

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