CO变换装置腐蚀机理及管线选材探讨

Discussion of the Corrosion Mechanism of the CO Shift Unit and the Material Selection of the Pipelines

以某甲醇项目CO变换为例,针对CO变换装置中存在的高温氢侵蚀、高温硫化物腐蚀、湿硫化氢腐蚀、应力腐蚀等腐蚀现象,分别探讨了相应的腐蚀机理与影响因素;根据不同操作区间气体组分和工作条件,提出对管道选材采取的相应措施及选材要点。

Corrosion mechanism, with reference to various corrosions, e.g. high temperature hydrogen corrosion, sul- fur corrosion, wet hydrothion corrosion, stress corrosion, etc., and factors that impacting such corrosions against the CO shift unit were discussed, taking the CO shift unit in a methanol synthesis plant posed on the material selection of the pipes according to the gas composition and areas as a case in point. Suggestions were pro- operating conditions at different operating