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Vaporization and Corrosion of Refractories in the Presence of Pressurized Pulverized Coal Combustion Slag
Author(s) -
Biedenkopf Peter,
Karwath Thomas,
Kobertz Dietmar,
Rane Manisha,
Wessel Egbert,
Hilpert Klaus,
Singheiser Lorenz
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00858.x
Subject(s) - vaporization , chromium , corrosion , metallurgy , materials science , combustion , pulverized coal fired boiler , slag (welding) , flue gas , coal , chemistry , organic chemistry
The corrosion and vaporization behavior of eight commercial refractories containing Cr 2 O 3 were investigated under simulated pressurized pulverized coal combustion (PPCC) conditions at 1723 K in the presence of liquid slag. The corrosion resistance of the refractory materials decreased with increased content of free Cr 2 O 3 , because bursting (reaction of Fe 3 O 4 with Cr 2 O 3 ) occurred. Refractories containing MgCr 2 O 4 with dissolved Al 2 O 3 showed the highest corrosion resistance. Thermodynamic calculations showed that CrO 3 and CrO 2 (OH) 2 were the most volatile species in air and in PPCC flue gas, whereas additions of A 2 O (A = Na and K, minor slag component) increased the chromium vaporization significantly because of A 2 CrO 4 formation. Knudsen effusion mass spectrometry measurements showed that the chromium vaporization of refractories was directly correlated to the Cr 2 O 3 content of the material. In contrast, refractories containing MgCr 2 O 4 showed a significant decrease in chromium vaporization.