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Title: REHEATER GENERAL STRESS CALCULATIONS.

Publication Date:
Research Org.:
Babcock and Wilcox Co., Barberton, Ohio (US)
OSTI Identifier:
4489973
Report Number(s):
BW-67-2(App.)(Vol.4)
NSA Number:
NSA-22-042173
DOE Contract Number:
AT(11-1)-1280
Resource Type:
Technical Report
Resource Relation:
Other Information: UNCL. Orig. Receipt Date: 31-DEC-68
Country of Publication:
United States
Language:
English
Subject:
N38160* -Power Reactor Development-Auxiliary & Emergency Systems; ANALYSIS; BOILERS; BOILING; HEATERS; HEATING; LIQUID METAL COOLANT; POWER PLANTS; REACTORS; SODIUM; STEAM; STEAM GENERATORS; STRESSES; REACTORS, POWER/steam generator design for 1000 MW(e), reheater stress calculations for sodium-heated; REACTORS, LIQUID METAL-COOLED/ steam generator design for 1000 MW(e), reheater stress calculations for sodium- heated; BOILERS/reheater stress calculations for sodium-heated steam generator

Citation Formats

None. REHEATER GENERAL STRESS CALCULATIONS.. United States: N. p., 1968. Web. doi:10.2172/4489973.
None. REHEATER GENERAL STRESS CALCULATIONS.. United States. doi:10.2172/4489973.
None. Thu . "REHEATER GENERAL STRESS CALCULATIONS.". United States. doi:10.2172/4489973. https://www.osti.gov/servlets/purl/4489973.
@article{osti_4489973,
title = {REHEATER GENERAL STRESS CALCULATIONS.},
author = {None},
abstractNote = {},
doi = {10.2172/4489973},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 31 00:00:00 EST 1968},
month = {Thu Oct 31 00:00:00 EST 1968}
}

Technical Report:

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  • This technical planning study examines world experience outside the U.S. on the spalling of steam-side oxide scale from austenitic and ferritic superheater and reheater tube materials with special emphasis on the study of this problem being conducted in the U.K. The physical properties of the oxide scales are reviewed and expansion coefficient data are used to estimate the cooling strains in the oxide for various alloys. Other contributory sources of strain are discussed and models are presented for the failure behavior of oxide layers both in tension and in compression. A method of predicting quantities of debris release is described.more » The hydrodynamic behavior of spalled oxide flakes in steam circuits is considered analytically and the conclusions are used to construct a method for assessing the risk of tube blockages. Attention is drawn to the importance of the kinetic energy of the debris particles in affecting wear rates on the eroded circuit components. The concluding sections of the study examine the various palliative operational and design solutions to prevent turbine erosion and tube blocking, and highlight the areas where further study of the problem are required.« less
  • A laboratory scale combustor was used to investigate magnesium and manganese additives for control of high-temperature fouling and corrosion in oil-fired boilers. Flue gases and particulate solids were produced under conditions which simulate those of a superheater in a utility boiler. The fuel contained 2.4 percent sulfur, 390 ppM vanadium and 35 ppM sodium. For some runs the sodium content was increased to 235 ppM. Specimens of typical superheater tube alloys were maintained at 1100/sup 0/F (593/sup 0/C) in a gas temperature zone of 1700 to 1900/sup 0/F (927 to 1038/sup 0/C) during 50-hour combustion runs. Both magnesium and manganesemore » additives were effective in reducing SO/sub 3/ in the flue gas. The combination of additive usage with low excess air operation of the combustor had the greatest effect in reducing SO/sub 3/. Ash deposits were made friable and their adherence was reduced significantly by the additives when the original fuel oil was burned. With added sodium content in the oil, the deposit adherence was not reduced. The corrosion rates of superheater alloys decreased as the magnesium additive particle size decreased. When the additive dose rate provided an Mg/V ratio of 0.4, the corrosion rates were the lowest. The mechanism of additive action in boh the combustor deposits and superheater deposits from utility boilers was investigated by chemical analysis, x-ray diffraction, and energy dispersive x-ray analysis. 14 references, 24 figures, 12 tables.« less