Corrosion of 304L stainless steel in CO2 removal units using high concentration DGA aqueous solution-Concentration differences of metallic ions in deposits along the different flow streams-.:Concentration differences of metallic ions in deposits along the
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概要
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The general corrosion of 304L stainless steel has been found in CO2 removal units using a high concentration DGA solution in a natural gas processing plant . Deposits precipitated in the DGA units were sampled during annual inspections and were analyzed for metallic ions and their compounds. It was found that Fe and Cr wererich in the deposits along the lean DGA lines and Ni was rich along the rich DGA lines. Fe and Cr precipitated as oxides and Ni precipitated as sulfides. This uneven distribution of metallic ions in the units was interpreted due to the differences in metal chelate stability with DGA and/or DGA carbamate and also due to the trace amount of H2S in the raw natural gas. Although there has not been reported any direct proof of corrosive roles of carbamates in actual amine units, this uneven distribution of metallic ions is one of indirect evidences that DGA carbamate plays some roles in corrosive systems in actual DGAunits.
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