长距离输水管线停泵水锤分析及防护

对于采用压力流的长距离输水管线,水锤防护措施对于保障管网稳定运行至关重要。以海南省某典型“长距离、大流量、低扬程”输水工程为例,借助水锤模拟软件,研究了因断电导致停泵时不同水锤防护措施对输水管网的影响。该项目输水管线有明显的高点,存在多处“驼峰”“鱼背”“膝部”,停泵后容易形成负压并发生断流空腔弥合水锤。通过软件模拟,调整工程设计,优化排气阀门类型及布置点位,能避免发生弥合水锤。对于该类型输水管线,泵出口设置两阶段关闭液控缓闭蝶阀意义不大,关键点位设置注气微排阀则能有效控制管网压力,进而保护管道。

Analysis and Protection of Water Hammer for Pump Stopping in Long Distance Water Conveyance Pipeline

For long distance water conveyance pipeline with pressure flow, the water hammer protection measures are critical to ensure the stable operation of the pipe network. Take a typical "long distance, large discharge and low lift" water conveyance project in Hainan Province as an example, with the help of water hammer simulation software, the influence of different water hammer protection measures on the water distribution network caused by power failure was studied. The project had high points along the pipeline. With many "humps","fish backs" and "knees", it was easy to fonn negative pressure and water hammer of cavities collapsing after pump stopped. Software simulation showed that, adjusting engineering design and optimizing valve type and layout point could reduce the possibility of water hammer. For this type of water conveyance pipeline, it was meaningless to close liquid control slow closing butterfly valves in two stages at pump outlet. Setting gas injection micro-drain valves at key points could effectively control the pipe network pressure, and then protect pipeline.