摘要
随着原料中硫含量的不断增加,炼油二次加工装置中硫腐蚀也日益严重,对装置影响较大的腐蚀类型主要是低温湿硫化氢腐蚀、高温硫腐蚀和高温环烷酸腐蚀。高温硫腐蚀可以通过提高设备材质来控制,控制较为容易,而低温湿硫化氢腐蚀影响范围广、机理复杂,控制难度较大。对延迟焦化装置进行标定,得到物料平衡和硫平衡数据,并采用PRO/Ⅱ工艺模拟软件对焦化分馏系统、压缩机系统和吸收稳定系统进行工艺全流程模拟,预测所有中间物料的硫含量数据,绘制全流程硫分布图。对装置影响较大的腐蚀类型及部位进行了介绍,并在硫分布图的基础上,对这些腐蚀部位的温度和硫含量进行系统归纳,为装置硫腐蚀日常监控和防腐蚀改造提供了理论依据,保证了装置的长周期稳定运行。
With the increase of sulfur content in raw materials,sulfur corrosion in the secondary processing unit of refining is be⁃coming more and more serious.The types of corrosion that has a great effect on the device are mainly low temperature wet hydro⁃gen sulfide corrosion,high temperature sulfur corrosion and high temperature naphthenic acid corrosion.High temperature sulfur corrosion can be prevented by material upgrading,which is relatively easy to manage;while low temperature wet hydrogen sulfide corrosion has a wide range of influence and complex mechanism,which is difficult to control.According to the on⁃site operation of delayed coking unit,material balance and sulfur balance data were obtained.The entire process included fractionation system,compressor system,and absorption⁃stabilization system was simulated by PRO/Ⅱsoftware;sulfur content of all intermediate ma⁃terials was predicted and sulfur distribution diagram of the whole process was created.The types and locations of corrosion that had a significant impact on device were introduced.Based on the sulfur distribution diagram,the temperature and sulfur content of these corrosion locations were systematically summarized,which provided a theoretical basis for daily monitoring of sulfur corro⁃sion and anti⁃corrosion renovation of the unit,and ensured long⁃term stable operation of the plant.
作者
党建军
DANG Jianjun(CNOOC Huizhou Petrochemical Co.,Ltd.,Huizhou 516086,China)
出处
《石油化工腐蚀与防护》
CAS
2023年第4期26-30,共5页
Corrosion & Protection In Petrochemical Industry
关键词
延迟焦化装置
全流程硫分布
工艺模拟
湿硫化氢腐蚀
高温硫腐蚀
高温环烷酸腐蚀
delayed coking unit
sulfur distribution in the whole process
process simulation
wet hydrogen sulfide corrosion
high temperature sulfur corrosion
high temperature naphthenic acid corrosion
