LNG接收站高压泵及高压管道系统压力等级优化研究

Optimization study on high-pressure pump and pressure grade of high-pressure piping system in LNG terminal

以某LNG(液化天然气)接收站为例,介绍了LNG接收站各运行工况下的物料平衡计算、高压泵扬程计算及高压系统压力等级确定的过程,并对影响高压泵扬程及管道压力等级的关键因素进行了分析。该LNG接收站为分期建设,一期工程建设规模3.0 Mt/a,远期工程建设规模10.0 Mt/a。物料平衡计算采用PORⅡ9.4软件得到各工况下LNG物理性质参数,用作高压泵扬程计算中的输入数据。通过优化高压泵运行工况选取原则,结合泵实际运行性能曲线,实现了高压泵扬程计算及压力等级选择的优化。优化后,一期+远期工程高压泵能耗最高可节约7.4%,并降低了高压泵出口管道及设备的设计压力及阀门磅级。

Taking a domestic LNG terminal as an example,this paper introduces the process of material balance calculation,high-pressure pump head calculation and pressure grade determination of high-pressure system under various operating conditions.Key factors affecting pump head and piping pressure grade are analyzed.The LNG terminal is constructed in stages,with a construction scale of 3.0 MM TPY for the first phase and 10.0 MM TPY for the long-term project.The material balance calculation is performed using PROⅡ9.4 software to obtain LNG physical property parameters under various operating conditions,which are used as input data in the high-pressure pump head calculation.By optimizing the selection principle of high-pressure pump operating conditions and combining with the actual operation performance curve of the pump,the optimization of high-pressure pump head calculation and pressure grade selection is realized.Through optimization,the energy consumption of high-pressure pump in the first phase+long-term project can be saved by up to 7.4%,and the design pressure and valve class of high-pressure pump outlet pipeline and equipment can be reduced.