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Cousins, Ashleigh
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article
Corrosion coupon evaluation under pilot-scale CO2 capture conditions at an Australian coal-fired power station
Abstract
Corrosion is a major operational issue in amine treating plants. With the likely application of CO2 capture technologies to coal combustion flue gases, corrosion rates in gas streams containing oxygen are of interest and evaluation of potential construction materials under realistic conditions is essential. A total of 128 corrosion coupons were installed at the Tarong Post Combustion Capture (PCC) pilot plant in 8 locations during operation with 30 wt% monoethanolamine (MEA). Each corrosion test location contained 4 coupons of each type of metal (316L, 316L welded, C1018, C1018 galvanized). Coupons were installed in the pilot plant for 4296 or 5448 h; however plant operation was intermittent with actual operating times of 593 or 745 h. The highest corrosion rates were observed for carbon steel (C1018) and galvanized carbon steel (C1018 GLV) coupons located in both the absorber and stripper solvent storage tanks. C1018 GLV coupons typically showed higher rates of corrosion than C1018 coupons. C1018 coupons located in the absorber wash section also exhibited high corrosion rates, while C1018 GLV coupons in the same location did not. XRD analysis showed that the galvanized coupons in the absorber wash section retained some Zn in the corrosion scale. This could have aided their resistance to corrosion in this location. All other galvanized samples lost their zinc coating, indicating galvanizing might not be appropriate for use in CO2 capture applications. C1018 coupons in the absorber column experienced pitting. This was not seen for the galvanized coupons. In the stripping column, both the C1018 ...