LNG接收站经济性运行策略优化

节能降耗一直是企业发展的重要措施。针对液化天然气(LNG)接收站的外输负荷周期性变化特点及峰谷电价政策,建立了LNG接收站的经济运行优化模型,理论上获得经济运行策略优化准则。由于接收站的运行条件复杂多变,各设备的运行工况彼此相互耦合,很难对模型进行解析求解,因此,建立了一个可以准确反映LNG接收站动态特性的运行操作仿真平台,并结合所导出的优化准则,选择国内某运营的LNG接收站3种夏季典型外输日负荷工况进行了运行策略优化,接收站每月可以节省约4.38%的电费。实例研究结果表明了此优化准则的有效性、动态仿真平台在寻优过程中的可靠性与优越性。

Optimization of economic operation for LNG receiving terminal

Energy saving and consumption reduction have been important measures of enterprise development. Considering the periodic user load and the peak valley tariff policy, an optimization model of economic operation for LNG receiving terminal is established, from which an analytic formula (optimization criterion) for the optimization policies of economic operation is derived. Due to the complex operating conditions and the coupled devices in which the operating conditions are affected each other, it is difficult to get the solution of the model analytically, therefore a dynamic simulation system for the LNG receiving terminal system with the accurate dynamic characteristics of the terminal and the optimization criterion derived is built here, with which a case study of a domestic LNG receiving terminal under operation is made. The results of the case study affirm the effectiveness of this optimization criterion and the reliability and superiority of the dynamic simulation platform in the optimization process. In this paper, the operation strategy of three typical user load conditions of the receiving terminal is researched. About 4.38 percent of the electricity bill may be saved monthly for the LNG receiving terminal under this strategy.