Fabrication of Test Tubes for Coal Ash Corrosion Testing

摘要

This paper deals with the fabrication of tube sections of four alloys for incorporating into test sections to be assembled by Babcock Wilcox for installation at Ohio Edison Power, Niles Plant. The primary purpose of the installation was to determine the corrosion behavior of ten different alloys for flue gas corrosion. Ohio Edison Power, Niles Plant is burning an Ohio coal containing approximately 3.4% S (dry basis) and approximately 0.4% alkali which causes chronic coal ash corrosion of the units superheater tubing. The 2.5-in.-OD x 0.4in.-wall x 6-in-long sections of four alloys (type 304H coated with FeAl alloy FAS (developed at the Oak Ridge National Laboratory (ORNL)), 310 + Ta, modified 800H, and Thermie alloy) were fabricated at ORNL. Each alloy tubing was characterized in terms of chemical analysis and microstructure. The machined tubes of each of the alloys were inspected and shipped on time for incorporation into the test loop fabricated at BW. Among the alloys fabricated, Thermie was the hardest to extrude and machine.