常压蒸馏塔塔顶回流管线露点腐蚀形成机制及影响因素研究  

RESEARCH ON FORMATION MECHANISM AND INFLUENCING FACTORS OF DEW POINT CORROSION IN ATMOSPHERIC DISTILLATION COLUMN OVERHEAD LINE

作　　者：偶国富 陶情情 金浩哲 Ou Guofu;Tao Qingqing;Jin Haozhe(Institute of Flow-Induced Corrosion and Intelligent Prevention and Control,Changzhou University,Changzhou,Jiangsu 213164;Institute of Flow-Induced Corrosion,Zhejiang Sci-Tech University)

机构地区：[1]常州大学流动腐蚀与智能防控研究所,江苏常州213164 [2]浙江理工大学流动腐蚀研究所

出　　处：《石油炼制与化工》2023年第4期125-132,共8页Petroleum Processing and Petrochemicals

基　　金：国家自然科学基金项目(U1909216,52176048)。

摘　　要：针对某石化企业常压蒸馏塔塔顶(简称常顶)回流管线出现的露点腐蚀问题,采用基于烃水二元交互的PR(Peng-Robinson)状态方程法,建立标定工况下常顶回流系统工艺计算模型。结合露点形成机制,分析露点出现前后腐蚀性介质在油气水三相中的分布变化;研究不同注水比例下塔顶回流管线中HCl和H_(2)S的分布情况以及原料油中不同S、N含量及常顶油量下塔顶压力、汽提蒸汽量及注水比例对露点温度的影响。结果表明:HCl和H_(2)S是引起露点腐蚀的关键影响因素,随着冷凝过程的进行,塔顶回流管线中的HCl含量不断增加,H_(2)S含量呈现先增加后降低的趋势;标定工况下塔顶水的露点温度为100.45℃,塔顶压力、汽提蒸汽量及注水比例与露点温度均呈正相关性,其中塔顶压力对露点温度的影响最大,平均每增加0.02 MPa,相应露点温度升高2.97℃。In order to solve the dew point corrosion problem in the atmospheric distillation column overhead line in a petrochemical enterprise,the PR(Peng-Robinson)state equation method based on the binary interaction of hydrocarbon and water was adopted,and the process calculation model of the overhead system under standard conditions was established.Based on the mechanism of the dew point formation,the state changes of the corrosive medium in the oil-gas-water three-phase before and after the dew point were analyzed.The distribution of HCl and H_(2)S in the overhead line of the column under different water injection ratios and the influence of top pressure,stripping steam volume and water injection ratio on dew point temperature under different S and N contents in the feed oil and constant oil content were studied.The results showed that HCl and H_(2)S were the key factors causing dew point corrosion.With the condensation process,the content of HCl in the overhead line of the column increasesd,and the content of H_(2)S increased first and then decreased.The dew point temperature of the overhead water is 100.45℃,and there is a positive correlation between the column top pressure,stripping steam quantity,the water injection ratio and the dew point temperature,the average dew point temperature increases by 2.97℃per 0.02 MPa of top pressure increases.

关 键 词：常压蒸馏塔 塔顶回流管线 露点温度 塔顶压力 汽提蒸汽量 注水比例 

分 类 号：TE986[石油与天然气工程—石油机械设备]