关键词: 蜡油加氢装置, 长周期运行, 原料油性质, 反应温度, 反应器压力降

Abstract: 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.

Key words: wax oil hydrogenation unit, long period operation, feedstock properties, reaction temperature, reactor pressure drop