Materials Science Division coal technology seventh quarterly report, April--June 1976. [Gasification plant materials] [electronic resource].
- Washington, D.C : United States. Energy Research and Development Administration, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 53 : digital, PDF file
- Additional Creators:
- Argonne National Laboratory
United States. Energy Research and Development Administration
United States. Department of Energy. Office of Scientific and Technical Information
- Preliminary analysis of test results of 15 ceramic refractories for slagging gasifiers indicates that the magnesia-chrome, chrome-bonded alumina, and fusion-cast spinel bricks have substantially better abrasion-corrosion resistance than the other compositions. Thermal-shock testing has indicated that resistance to spalling of ceramic coatings can be improved with the use of graded alumina-chromia and magnesia-alumina multilayer coatings. The first corrosion-erosion test run for a total of 100-h exposure has been completed by Solar, Inc. Of the ceramic coatings, only magnesium zirconate survived the exposure. The refractory specimens exposed simultaneously with the coated metal specimens exhibited moderate or no attack. The in-situ erosion measuring system for the main coal feed line for the Synthane coal-gasification pilot plant has been installed and initial tests have been completed. A thermodynamic approach has been developed to characterize the gas environment in different pilot-plant coal-gasification processes. The analysis is used to examine the thermodynamic stability of iron- and nickel-base alloys in these process environments. The results show that the sulfur and oxygen potentials in all the processes are in a region where chromium oxide will be thermodynamically stable. In the absence of a continuous oxide layer, sulfidation of the alloys is expected, which can lead to severe corrosion rates, particularly when liquid nickel sulfides are formed. It is concluded that a protective Cr/sub 2/O/sub 3/ layer is essential for an effective application of these alloys in coal-conversion processes. Failures of HYGAS pilot-plant components resulted from, or were aggravated by, operation under off-design conditions, which resulted in much more corrosive environments than would have occurred under design conditions.
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