脱硫化氢汽提塔挥发线腐蚀机理研究  

Study on Corrosion Mechanism of Volatilization Line of Desulfurizing Hydrogen Stripper

作　　者：黄绍硕 刘伟[2] 吕运容 孙志伟[2] 李伟明[2] HUANG Shaoshuo;LIU Wei;LYU Yunrong;SUN Zhiwei;LI Weiming(Zhongke(Guangdong)Refinery&PetrochemicalCompanyLimited,Zhanjiang 524012,China;Guangdong ProvincialKey Laboratory of Petro Chemical Equipment Fault Diagnosis,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]中科(广东)炼化有限公司,广东湛江524012 [2]广东石油化工学院广东省石化装备故障诊断重点实验室,广东茂名525000

出　　处：《热加工工艺》2021年第8期153-156,159,共5页Hot Working Technology

基　　金：2018年广东省科技创新战略专项项目(2018KJ011)。

摘　　要：通过宏观检查、金相、扫描电镜分析及数值分析等方法对脱硫化氢汽提塔挥发线的腐蚀机理进行分析。结果表明,挥发线腐蚀的主要原因是缓蚀剂注入管选材不合理,在H2S+HCl+NH3+H2O环境下发生露点腐蚀,造成注入管穿孔并折断,改变了挥发线内的流场和温度场,导致未汽化的缓蚀剂水溶液粘附在垂直管段,造成该部位结垢,产生垢下腐蚀减薄。团状的缓蚀剂水溶液在油气的裹挟和重力作用下,冲击弯管外弯处,造成该部位受到冲刷和酸性腐蚀。The corrosion mechanism of the stripper volatilization line was studied by macro examination,metallography,scanning electron microscope and numerical analysis.The results show that the main reason for the corrosion of volatilization line is inappropriate choice of corrosion inhibitor injection pipe.Due to the occurrence of dew point corrosion in the environment of H2S+HCl+NH3+H2O,resulting in the perforation and fracture of the injection pipe and changing the flow field and temperature field in the volatilization line.Thus,the non-vaporized inhibitor water solution adhering to the vertical pipe section results in scaling in this part and corrosion thinning under scale.Under the action of the oil and gas entrainment and gravity,the water solution of the cluster corrosion inhibitor has an impact on the elbow of the outer bend for erosion and acid corrosion of the part.

关 键 词：硫化氢 汽提塔 挥发线 腐蚀 

分 类 号：TG174.426[金属学及工艺—金属表面处理] TG113.12[金属学及工艺—金属学]