常减压初底油与催化油浆热联合问题分析与对策

Analysis and Countermeasures of Thermal Combination of Primary Bottom Oil and Catalytic Slurry in Atmospheric and Vacuum Distillation Unit

中国中化山东昌邑石化有限公司常减压装置按照加工重质油设计,原油性质轻质化后换热网络不匹配导致装置存在原油换热终温低、加热炉燃料气消耗大等问题,而催化裂化装置作为公司主要产汽装置,其蒸汽产能过剩。为解决换热网络不匹配和蒸汽过剩的矛盾,从催化装置引入循环油浆与常减压初底油进行换热,以解决因原料性质变化带来的一系列问题,但在系统运行过程中产生了换热器管束结焦、换热器管箱密封泄漏和密封面电偶腐蚀等问题,给装置生产运行带来一定的安全风险。有鉴于此,制定了日常管控和设备结构材质升级等处理方案,成功解决了油浆热联合带来的运行问题。

The atmospheric and vacuum distillation unit of Sinochem Shandong Changyi Petrochemical Co.,Ltd.is designed to process heavy oil.The mismatch of heat exchange networks after the lightening of crude oil properties leads to a few problems such as low final heat transfer temperature of crude oil,and high fuel gas consumption of heating furnace.On the other hand,the catalytic cracking unit,as the main steam production unit of the company,has excess steam capacity.In order to solve the contradiction between the mismatch of the heat exchange network and the excess steam capacity,the company introduced the circulating slurry from the catalytic unit to make heat exchange with the initial bottom oil of atmospheric and vacuum unit to solve a series of problems caused by the change of the nature of raw materials.In view of the problems arose in operation of the system,such as the coking of the heat exchanger tube bundle,the leakage of the seal of the heat exchanger tube box,and the corrosion of the electric couple on the seal surface,which brought certain safety risks to the production and operation of the plant,the company adopted a series of measures including establishing daily control mechanism and upgrading equipment structure material,and successfully resolved the problems brought by the thermal combination of oil and slurry.