安全、健康和环境2025，Vol.25Issue(10)：12-18,7.DOI:10.3969/j.issn.1672-7932.2025.10.002
连续重整装置预分馏系统腐蚀风险分析与防控
Corrosion Analysis and Countermeasures for the Pre-fractionation System of Continuous Reforming Unit
刘越 1郑兴宇 1兰正贵 1叶成龙 1葛春涛1
作者信息
- 1. 中石化安全工程研究院有限公司,山东 青岛 266104||中石化国家石化项目风险评估技术中心有限公司,山东 青岛 266104
- 折叠
摘要
Abstract
With the deterioration of crude oil quality and increasing demands for long-term operational relia-bility of refinery facilities,corrosion issues of oil refining units have become increasingly prominent.During the operation of the 1.8×106 t/a continuous reforming unit at a certain refining and chemical company,online cor-rosion monitoring detected abnormal wall thickness at the top of the isopentane tower and in the reflux system.To assess the risk of corrosion failure and prevent potential accidents,a corrosion investigation and risk analysis were carried out during the shutdown and maintenance in 2024.The inspection revealed severe corrosion in multiple pieces of equipment and pipelines within the pre-fractionation system.The system was analyzed by means of macroscopic corrosion morphology inspection,energy spectrum analysis of corrosion products,and a-nalysis of the process operating conditions in the first operation cycle of the equipment.The corrosion was main-ly caused by a severe wet hydrogen sulfide environment,which resulted from the combined effect of high levels of light sulfides in the feedstock,elevated water content due to the absence of a buffer tank,and the process configuration of fractionation followed by hydrotreating.Targeted countermeasures were proposed including the installation of raw material buffer tanks,material upgrading and enhanced process control.Within one year of implementation these measures,the corrosion rate at the maximum thinning part of the reflux tank at the top of the isopentane tower and its outlet pipeline was significantly reduced from 0.92 mm/a to 0.09 mm/a(a reduc-tion of approximately 90%).Through systematic risk identification and assessment,this study proposes targeted prevention and control measures,providing an important reference for the accident prevention and safe operation of similar devices.关键词
连续重整装置/预分馏系统/湿硫化氢腐蚀/风险评估/事故预防Key words
continuous reforming unit/pre-fractionation system/wet hydrogen sulfide corrosion/risk as-sessment/accident prevention分类
石油、天然气工程引用本文复制引用
刘越,郑兴宇,兰正贵,叶成龙,葛春涛..连续重整装置预分馏系统腐蚀风险分析与防控[J].安全、健康和环境,2025,25(10):12-18,7.
