摘要
多源单汇系统轻烃外输时源点之间相互影响强烈,启泵注入的次数越多,管内水力波动越频繁,而注入次数与源点外输模式及调度计划密切相关。针对各源点变流量间歇输送多种轻烃的调度计划存在频繁切换外输轻烃问题,建立了以切换次数最少为目标,以源点轻烃库存、注入点压力、源点外输模式为约束的MINLP调度优化模型,结合目标函数的物理意义与约束条件的特点采用状态转移法进行求解,计算得到切换次数最少的外输方案,并给出切换操作顺序、压力和库存历史模拟数据。以大庆油田杏区轻烃外输为例,各源点的三种烃分别从相应储罐泵送至主管道外输至终端,对不同时长的模拟结果表明,优化可减少40%～50%的启停泵次数,既充分利用了油库等设施又减少了频繁启停泵带来的能耗及管理风险等问题,保证了管网的平稳高效运行。
Strong mutual influences between source points are produced when products are transported in multi-source single-sink system. An increase in counts of the pump startup/ shutdown results in frequent pressure fluctuation. Due to frequent switches in the scheduling plan caused by transporting multiple products at different source points intermittently and variably, a MINLP scheduling optimization model has been established to minimize the switching times. This model satisfies pressure constraints, transport model constraints and tank capacity constraints. The state transformation method is proposed to solve this model in combination with the physical meaning of objective function and the characteristics of constraints. The results give not only transport plan with the least switching times, the operating order and switching time, but also the history curves ofpipeline pressure and inventory levels in tanks. Taking Xingqu pipeline system in Daqing Oilfield as an example, three kinds of light hydrocarbons in five different source stations are pumped from their corresponding tanks to the main pipeline and then transported to the terminal. The optimal results for different time horizons show that the counts of-pump startup/shutdown can be reduced by 40% to 50%. This takes full advantage of the oil depots＇ capacity and other facilities and also reduces the energy consumption and management risks caused by frequent pump startup/shutdown, thereby ensuring the smooth and efficient operation of-the pipeline system.
出处
《油气田地面工程》
2016年第1期1-4,共4页
Oil-Gas Field Surface Engineering
基金
国家自然科学基金项目<成品油管道批次输送过程中的复杂传热传质机理研究>(51474228)资助
关键词
多源单汇系统
轻烃
变流量间歇输送
最少切换次数
状态转移法
multi- source single- sink system
liquefied light hydrocarbon
intermittent variable-flow transportation
minimum switching times
state transformation method
