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13 January 2010
"Observation of Corrosion Mechanisms in Oxyfuel atmospheres on Micro- and Nanoscale"
by Axel Kranzmann
| Abstract: |
The need for introducing industrial CO2 capture and sequestration
processes into power plants pushes the development of high efficient
coal power plants. Two different technology routes are near or in the
field test phase. The German power industry and the government push
two processes. The gasification of coal including the subsequent
combustion of H2 using a combined cycle and the direct combustion
of coal with 100% oxygen totally replacing air. The second process
demands materials stable in CO2 rich atmospheres with high H2O partial pressure,
SO3/SO2 gas and residual O2 and material temperatures up to 720 °C.
In the first part of the seminar I will give a short overview on the technology
road map and the political boundary conditions in Germany. This part of the
presentation includes a description of the current state of the national
demonstration projects CO2SINK, Schwarze Pumpe and others.
The second part will focus on corrosion research of my team in
our facilities in Berlin between 2006 and end of this year. In
our experimental device boiler tubes were annealed in contact
with CO2-H2O-O2 atmospheres with different O2 partial pressures.
The additional influence caused by sulphur oxide is a current research
topic and is not included in this discussion. It turned out that the
gas corrosion in wet CO2 at high temperatures is as severe as steam
corrosion at high temperature if only the steel loss per unit time
is considered. Additional reactions cause carburisation of the 9 to 12%
Cr-steel in a temperature window between 500 °C and 620 °C. An expressed
interaction between the corrosion on the inside surface and outside
surface was observed. This demonstrates that corrosion mechanisms in
tube like components were the gases in the tube and outside the tuber
differ may not be independent in special cases. The corrosion products
were identified applying SEM and TEM analysis methods. The comparison
between corroded materials from coal burner facilities and laboratory
experiment results demonstrated that the laboratory observations are
valid in real coal combustion flue gas.
The conclusive remarks will give an outlook on the coming corrosion
studies and potential material developments for the oxyfuel power process.
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| Where: |
Tailgators Sports and Entertainment
1642 Merivale Road, Ottawa, Ontario |
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When: |
Wednesday, January 13th, 2010
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Social Hour: |
6:30 pm |
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Dinner: |
7:00 pm |
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Technical Meeting: |
8:00 pm |
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Price: |
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Member: |
$22.00 |
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Non-Member: |
$26.00 |
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Student: |
$12.00 |
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Note: |
There is no charge for those who wish to
attend the technical presentation only. |
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