海外跨境长距离输水工程的水锤防护分析

Analysis of Water Hammer Protection in Overseas and Cross-border Long Distance Water Transfer Project

长距离输水工程中水锤的影响,关系到整个输送系统运行的稳定性和安全性。埃塞俄比亚至吉布提跨境供水工程管道输送距离总长超过200 km,输送流态包括泵送压力流和有压重力流。通过建立数学模型,对这两种流态下事故停泵、关阀、小流量运行等不同工况下进行水锤模拟分析,根据计算结果提出防水锤空气罐体积、空气阀位置、关阀时间要求、阀门组合形式等水锤防护措施,为输水系统的安全可靠运行提供了保障。

The protection of water hammer in long distance water transfer project is related to the stability and safety of the whole transmission system operation. The total length of transboundary water supply pipeline from Ethiopia to Djibouti is more than 200 km which transfers water in forms of pumping pressure flow or pressure gravity flow. Through the mathematical model, water hammer was simulated and analyzed under different working conditions including pump-stop, valve closing and small flow in the two flow states above respectively. According to the results, measures about the volume of air vessel, position of air valve, temporal requirement of closing valve and the valve combination were proposed to prevent the water hammer, providing security and reliability guarantee for the operation of water conveying.