Hochtemperaturkorrosion von ferritischen und austenitischen Stählen in simulierten Rauchgasen kohlebefeuerter Kraftwerke
Hochtemperaturkorrosion von ferritischen und austenitischen Stählen in simulierten Rauchgasen kohlebefeuerter Kraftwerke
In the present work the high temperature corrosion behaviour of three 9% Cr-steels in simulated coal combustion gases has been investigated. For comparison reason the conventional ferritic steels X 20 CrMoV 12-1 and 10 CrMo 9-10 as well as the austeniticX 3 CrNiMoN 17-13 were also incorporated in th...
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Personal Name(s): | Thiele, M. (Corresponding author) |
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Quadakkers, Willem J. / Schubert, F. / Nickel, Hubertus | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1999
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Physical Description: |
114 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3712 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
In the present work the high temperature corrosion behaviour of three 9% Cr-steels in simulated coal combustion gases has been investigated. For comparison reason the conventional ferritic steels X 20 CrMoV 12-1 and 10 CrMo 9-10 as well as the austeniticX 3 CrNiMoN 17-13 were also incorporated in the research program. The temperature range considered is from 600 to 650°C. To evaluate the Jong term behaviour and thus to estimate the corrosion resistance of the materials under operating conditions the duration of the experiments was up to 10000 h. The mechanisms determining the corrosion processes at the different stages was being analysed by short term experiments (100 h) in model gas atmospheres. In air all investigated steels showed excellent oxidation properties, even during exposures of up to 10000 h. In the simulated coal combustion atmospheres, however, only the higher alloyed steels X 20 CrMoV 12-1 and X 3 CrNiMoN 17-13 appeared to form protective oxide scales. Under these conditions the 9% Cr-steels and especially the steel NF 616 showed a dramatic increase in corrosion rate compared to oxidation in air. Ash deposits typical for coal power plants do not seem to have a significant influence on the corrosion process of the steels investigated within this research programme. The tremendous difference in oxidation behaviour of the 9% Cr-steels in the combustion gases compared to that in air is not primarily related to the presence of HCl (0.01- 0.001 vol.%) and SO2 (0.1 vol.%). The oxidation process is mainly determined by the water vapour which is present in the coal combustion gases in concentrations ranging from 7 to more than 20 vol.%. The material loss of the 9% Cr-steels in the simulated coal combustion gases was determined to be 0.08-0.11 mm/year at 600 and 0 .09-0.13 mm/year at 650°C. Based on a conservative estimation for a water vapour leading tube of P 91 which is additionally exposed to the combustion gas a reduction in wall thickness of about 0.2 mm/year at 600°C has to be takeninto account in component design. |