Effects of chlorine in coal on corrosion under reducing combustion gases
Conference
·
OSTI ID:43205
- Babcock and Wilcox, Alliance, OH (United States). Alliance Research Center
The corrosion resistance of several commercial alloys and coatings was evaluated under two laboratory combustion environments at 700 and 900 F for 1,000 hours. The mixed gases employed in the tests contained 500 ppmv H{sub 2}S, with and without 350 ppmv HCl, to simulate reducing combustion gases likely to exist locally on the waterwall surfaces in the combustion zone of utility boilers burning sulfur- and/or chlorine-bearing coals substoichiometrically. After the 1,000-hour exposures, the corrosion rates of the alloys and coatings were determined and their corrosion resistance was compared. Cross-sectional metallography was also performed to examine the corrosion products and morphologies formed on the sample surfaces. Results from this laboratory study indicated that the effects of chlorine in coal on the corrosion rates of alloys and coatings were negligible. The corrosion attack on metals was not accelerated by the presence of chlorine in the mixed gases. Further research studies are needed to validate these observations, and efforts to understand the exact role of chlorine in coal on the fireside corrosion of boiler tubes are recommended.
- OSTI ID:
- 43205
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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