蜡油加氢处理装置长周期运行影响因素分析

某公司3.2Mt/a蜡油加氢处理装置加氢蜡油硫含量及反应器第一床层压差持续上升,运行末期加工负荷降至340 t/h,反应温度升至413℃,加氢蜡油硫质量分数持续高于0.5％(设计值小于0.35％),反应器第一床层压差0.35 Mpa(设计值小于0.3 Mpa).为避免下游装置腐蚀加剧及反应器内构件损伤,装置运行43个月...

Analysis of factors affecting long period operation of wax oil hydrotreating unit

The sulfur content of hydrogenated wax oil and the first bed pressure difference of the reactor in the 3.2 MM TPY wax oil hydrotreating unit of a company continued are rising. At the end of the operation, the processing load decreases to 340 t/h, the reaction temperature increases to 413 ℃, the sulfur mass fraction of hydrogenated wax oil continues to be higher than 0.5%(the design value is less than 0.35%), and the pressure difference of the first bed of the reactor is 0.35 MPa(the design value is less than 0.3 MPa).In order to avoid further corrosion of downstream units and the damage of reactor internals in wax oil hydrotreating unit, the unit is shut down after 43 months of operation. Through the discussion and analysis of the catalyst deactivation, pressure drop rise of the first bed, internal leakage of the high-pressure exchanger, some measures are put forward, such as strengthening the management of feedstock, stabilizing the process operation, optimizing the bed temperature distribution, optimizing the catalyst grading and adjusting the reaction severity according to the metal deposition, so as to ensure the long-term operation of the unit, meet the requirements of repair every four years, avoid shutdown during operation.