溶剂再生装置酸性气系统腐蚀原因分析及对策  

ANALYSIS OF CORROSION REASONS AND COUNTERMEASURES FOR ACIDIC GAS SYSTEM IN SOLVENT REGENERATION EQUIPMENT

作　　者：彭礼成 林洪军 程宏 王海岗 Peng Licheng;Lin Hongjun;Cheng Hong;Wang Haigang(SinoChem Quanzhou Petrochemical Co.,Ltd.,Quanzhou,Fujian,362103)

机构地区：[1]中化泉州石化有限公司,福建泉州362103

出　　处：《石油化工设备技术》2025年第2期61-66,I0004,共7页Petrochemical Equipment Technology

摘　　要：某公司溶剂再生装置再生塔顶酸性气系统频繁发生腐蚀泄漏的问题。针对该问题,对腐蚀部位进行了宏观检查、壁厚测定、红外热成像检测以及腐蚀物能谱分析,结果表明,导致泄漏的原因为:再生塔顶含H_(2)S、CO_(2)和水蒸气的酸性气体经冷却器冷却后形成含液滴的气液混合流体,在结构突变部位产生严重紊流,导致流速和剪切应力增大,在介质腐蚀和流体冲刷的叠加效应作用下,金属表面形成的腐蚀物保护膜持续不断被冲刷剥离,使得壁厚不断减薄,最终导致了泄漏的发生。通过对设备和管道采取扩径、材质升级和结构优化等措施,有效抑制了腐蚀的发生,保证了装置的安全稳定运行。Aiming at the frequent corrosion leakage problem in the acidic gas system at the top of the regeneration tower of the solvent regeneration unit of one company,macroscopic inspection,wall thickness measurement,infrared thermal imaging detection,and corrosion energy spectrum analysis were carried out on the corrosion parts.The results showed that the acidic gas containing H_(2)S,CO_(2),and water vapor at the top of the regeneration tower formed a gas-liquid mixture fluid containing droplets after the acid gas was cooled by a cooler.At the structural mutation site,severe turbulence occurred,resulting in increased flow rate and shear stress.Under the action of the superimposed effect of medium corrosion and fluid scouring,the protective film of corrosives formed on the metal surface is continuously scoured and peeled off and the wall thickness is continuously thinned,which ultimately leads to the leakage.Through such measures as expanding the diameter,upgrading the material,and optimizing the structure of the equipment and pipelines,corrosion has been suppressed effectively.This has ensured the safe and stable operation of the device.

关 键 词：溶剂再生 酸性气 腐蚀 冲蚀 防护 

分 类 号：TE986[石油与天然气工程—石油机械设备]