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Duncombe, Bradley
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document
Corrosion in amine post combustion capture plants
Abstract
The corrosion observed on carbon steel (CS1018) corrosion coupons installed in an operating carbon dioxide Post Combustion Capture (PCC) pilot plant using monoethanolamine (MEA) as an absorber, were compared to laboratory measured corrosion rates. The corrosion rates measured in the laboratory (under anoxic conditions) were an order of magnitude higher than corrosion coupon data from the pilot plant. Corrosion rates measured in the pilot plant resulted in a lower time averaged rate than the 'instantaneous' rate measured in the laboratory. This difference was ascribed to: (i) intermittent use of the pilot plant; (ii) scale build up over more than 7 months in the pilot plant which was not present in the laboratory experiments. If we use the corrosions rates measured in the laboratory to design a PCC plant, then we can be confident that the actual corrosion rates in the plant will be lower.The laboratory tests also compared fresh reagent grade MEA solutions to solutions that had been used for 6 months in the PCC pilot plant. Used solutions contain impurities that were expected to increase the corrosion rate; however, under laboratory conditions the used MEA produced similar corrosion rates to the fresh MEA solutions.The laboratory study also revealed two possible corrosion protection mechanisms to be further investigated: (i) increasing the oxygen concentration; (ii) raising the system potential to the passive region in an anoxic system.