Comportement de métaux purs (FE, NI, CR ET AL) et de leurs alliages dans des conditions simulant celles rencontrées en incinérateur d'O.M

Abstract : In the last twenty years, the increase of volume of municipal waste to eliminate has led many European countries to develop incineration. The waste combustion leads to the formation of gases HC1 and S02, which can lead to very rapid degradation which necessitate stopping of the plants. For energetic output reasons, the tendency for waste to energy process is to increase the temperature. Rather than using very resistant but very expensive alloys to make superheater tubes, it can be interesting to apply coatings to carbon steels. In this study, we have tested individual components of alloys, but also binary or ternary alloys which could be used to coat metallic parts, in simulated waste environment. The first part of this work was the characterization of the compounds present in the deposits which are found on the superheaters and waterwall tubes in combustion chamber. These compounds (KC1, NaC1, CaS04) were then used individually in tests consisting to heat the metallic samples at 500eC, in contact with the synthetic ash and a oxidizing gazeous atmosphere containing HC1 and S02. Iron, nickel, chromium, aluminium, binary alloys (Ni-Cr, Fe-Cr, Ni-Al, Fe-Al) and ternary alloys (Ni-Cr-AI, Fe-Cr-AI) were tested in these conditions. Corrosion kinetics and mechanisms could be identified with use of thermogravimetry and characterization of the corrosion products (XRD, SEM, Electron microprobe and DSC). It could thus be found that alkaline components present in the ash have a determining influence on the corrosion processes.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1998_0210_SOUTREL.pdf
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https://hal.univ-lorraine.fr/tel-01776060
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Submitted on : Tuesday, April 24, 2018 - 3:51:07 PM
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  • HAL Id : tel-01776060, version 1

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Frédéric Soutrel. Comportement de métaux purs (FE, NI, CR ET AL) et de leurs alliages dans des conditions simulant celles rencontrées en incinérateur d'O.M. Autre. Université Henri Poincaré - Nancy 1, 1998. Français. ⟨NNT : 1998NAN10210⟩. ⟨tel-01776060⟩

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