摘要
目的明确兰州石化柴油加氢装置某换热器管束(主要材质为15Cr Mo钢和321不锈钢)的腐蚀失效原因。方法采用高温高压釜试验和模拟铵盐结晶试验研究15Cr Mo钢和321不锈钢在服役介质中的腐蚀机理。结果 15Cr Mo钢的腐蚀失效形式表现为铵盐结晶下的快速均匀腐蚀和其他部位的点蚀;而321不锈钢的腐蚀失效形式则相反,主要表现为铵盐结晶下的点蚀。结论为避免铵盐结晶引起的腐蚀穿孔,建议提高换热器出口温度到230℃以上,将换热器出口的注水工艺改为注中和缓蚀剂,在加氢反应器出口增设脱氯罐。
Object To make clear the cause of corrosion failure of refinery heat exchanger tubes(15CrMo steel and321stainless steel)for diesel hydrogenation unit of Lanzhou Petrochemical Company.Methods High-temperature autoclavewas used to test and simulate the corrosion mechanism of15CrMo and321stainless steel in corrosion medium.ResultsThe failure form of15CrMo steel exhibited quick uniform corrosion under ammonium salt scale and pitting corrosion forothers.On the contrary,the main failure form of321stainless steel showed pitting under ammonium salt scale.ConclusionTo avoid corrosion perforation caused by ammonium salt crystallization,it is suggested to improve the outlet temperatureof the heat exchanger to230℃above,change the water injection technology for the outlet of the heat exchangerto note neutralization corrosion inhibitor,and supply a dechlorination can at the outlet of the hydrogenation reactor.
作者
徐秀清
刘进文
来维亚
XU Xiu-qing;LIU Jin-wen;LAI Wei-ya(Tubular Goods Research Institute of China National Petroleum Corporation, Xi′an 710077, China;Jian′an Company of Changqing Oilfield Machinery Manufacturing General Factory, Xi′an 710201, China)
出处
《装备环境工程》
CAS
2017年第9期63-67,共5页
Equipment Environmental Engineering
基金
国家青年科学基金(21506256)
中石油科学研究与技术开发项目(2017D-2307)
关键词
柴油加氢
换热器管束
15CRMO钢
321不锈钢
腐蚀机理
diesel hydrogenation unit
heat exchanger tube
15CrMo steel
321 stainless steel
corrosion mechanism
