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原油差温顺序输送管道不同停输初始状态对应不同的安全停输时间,停输安全性是该输送工艺的重要技术问题。为了获得停输初始状态对停输安全性的影响规律,定性分析了一个输送周期内不同时段的停输安全性特点,通过引入停输时机的概念和定义无量纲排空时间定量分析了不同停输初始状态的相对停输安全性。结果表明:高凝油油头到达进站口时停输最危险;不同停输时机的无量纲排空时间相差明显,即不同停输时机再启动的难易程度或停输安全性相差较大,且差异程度随停输时间延长而增大;对于存在停输危险的停输时机,无量纲排空时间总会在某一停输时间下趋于无穷大,表明该停输时间下,再启动不会成功。研究结果可为原油差温顺序输送管道合理安排停输检修计划或定性判断停输安全时间提供技术支持。
Crude oil difference temperature sequential delivery pipeline different initial state of shut down corresponding to the different safety shut down time, shut down safety is an important technical issue of the conveying process. In order to obtain the regularity of the influence of the initial state of stoppages on the safety of stoppages, the characteristics of stoppages and safety during different periods of transit cycle were qualitatively analyzed. By introducing the concept of stoppingpots and defining the dimensionless emptying time, Lose the initial state of the relative security shutdown. The results show that the high-pour-off head is the most dangerous when it comes to inbound port. The dimensionless emptying time of different shut-down time is obviously different, that is to say, the difficulty of restarting or shut-in safety varies greatly between shut- , And the degree of difference increases with the stop-down time; for the stop-stop opportunity with stop-stop danger, the dimensionless emptying time tends to infinity under a certain stop-loss time, indicating that the stop-time should be restarted Will not be successful. The results of this study can provide technical support for the reason that crude oil dispatches the pipeline in a timely manner to schedule the shutdown or maintenance plan or qualitatively determine the time for stopping transportation.