减压深拔长周期运行技术分析与应用

分析了影响减压深拔长周期运行的主要因素,结果显示,防止减压炉炉管和减压塔内构件结焦是保证减压深拔长周期运行的关键。利用Petro-SIM流程模拟软件进行计算分析,实现减压深拔安全平稳长周期运行采取的优化操作措施是:(1)将减压炉出口温度控制在424~427℃,以确保最高油膜温度不高于465℃;(2)将炉管注汽总量控制在1.5~2.0 t/h,以保证最高温处炉管内介质的停留时间小于0.7 s;(3)将减压塔洗涤油最小流量控制为不小于140 t/h;(4)注入急冷油,将减压塔塔底温度控制为小于365℃。

Analysis and application of long- period vacuum deep- cut technology

The influence factors were analyzed for long period vacuum deep cut operation. The re sults showed that to avoid coking in the vacuum fur nace tubes and tower packings was the key to ensure long period operation of vacuum deep cut. The optimized operating conditions were defined based on the calculation results of Petro SIM process simulation software. The outlet temperature of vacu um furnace should be kept in the range of 424 -427 ℃ to get the highest oil film temperature no more than 465 ℃. The total steam injection flow rate mustbe controlled in the range of 1.5 2.0 t/h to guar antee the residence time of medium in the highest temperature furnace tubes less than 0.7 s. The low est flow rate of washing oil in the vacuum tower ought to be no less than 140 t/h. And the vacuum tower bottom temperature need to be maintained be low 365 ℃ by injecting quench oil.