Study on corrosion failure characteristics of reboiler smoke pipe in nature gas triethylene glycol dehydration unit
Taking a dehydration station in Nanchuan of Chongqing as the research object,the macroscopic morphology,metallographic,microscopic morphology and corrosion product analyses were conducted on the field reboiler smoke pipe,the corrosion failure mechanism of the smoke pipe was explored,and prevention measures were proposed.The results showed that the failure of the outer wall of the smoke pipe was due to pitting corrosion caused by Cl-,and at the same time,the curved section was superimposed with the cavitation corrosion.The main reason for the corrosion of the outer wall of the smoke pipe was that salt corrosion media such as Cl-in natural gas entered the triethylene glycol solution.The main reason for the cavitation corrosion on the outer wall of the smoke pipe was that the triethylene glycol solution in the reboiler tank had experienced acidic deterioration or foaming deterioration during the operation,and the on-site operation didn't timely identify and eliminate such failure.The material of the smoke pipe body was 20G ordinary carbon steel,which had poor resistance to Cl-pitting and cavitation corrosion,and it was the secondary reason causing corrosion failure accidents.
triethylene glycolnature gas dehydration unitreboilersmoke pipecorrosionfailure mechanism
万方数据
维普
