酸性气空冷器出口管道弯头腐蚀分析与防护  

Corrosion Analysis and Protection of Outlet Pipeline Elbow of Acid Gas Air Cooler

作　　者：缪光 Miao Guang(Fujian Fuhaichuang Petrochemical Co.,LTD.,Zhangzhou 363216)

机构地区：[1]福建福海创石油化工有限公司,福建漳州363216

出　　处：《石化技术》2024年第12期33-35,共3页Petrochemical Industry Technology

摘　　要：溶剂再生装置酸性气空冷器出口管道第一个弯头发生穿孔泄漏和壁厚减薄,通过宏观检查分析了弯头的腐蚀情况,采用扫描电子显微镜(SEM)分析了微观腐蚀形貌,通过X射线衍射(XRD)分析了腐蚀产物的成分,并对弯头的金相组织、化学成分和硬度进行了分析,结合空冷器的使用工况对弯头发生失效的原因进行了讨论。结果表明:由于加裂未运行状态下气相流速偏低,空冷器中的碱性酸性水沿管壁向下流动,对弯头外弯部位形成液体冲刷腐蚀,引起弯头局部减薄。根据失效原因,提出了提高气相流速和管道内部局部防腐的解决措施。The first elbow of the outlet pipeline of the acid gas air cooler in the solvent regeneration unit experienced perforation leakage and wall thickness reduction.The corrosion situation of the elbow was analyzed through macroscopic inspection,and the microscopic corrosion morphology was analyzed using scanning electron microscopy(SEM).The composition of the corrosion products was analyzed by X-ray diffraction(XRD),and the metallographic structure,chemical composition,and hardness of the elbow were analyzed.The reasons for the failure of the elbow were discussed in combination with the operating conditions of the air cooler.The results showed that due to the low gas flow velocity in the non-operating state of the crack,the alkaline acidic water in the air cooler flowed downward along the pipe wall,causing liquid erosion and corrosion on the outer bend of the elbow,resulting in local thinning of the elbow.Based on the failure reasons,measures to improve the gas phase flow rate and local corrosion protection within the pipeline were proposed.

关 键 词：酸性气空冷器 弯头 腐蚀 流速 

分 类 号：TE9[石油与天然气工程—石油机械设备]