长距离重力流输水工程首末两端阀门关阀方案研究

Optimization of Valve at Both Ends Closing Scheme for Long-Distance Gravity Flow Water Conveyance Project

鉴于长距离重力流输水工程中由关阀引起的水锤问题威胁输水系统的安全,需要制定合理的关阀方案方能有效减小水锤的影响。以某长距离重力流输水工程为例,依据水锤计算基本原理,利用Bentley Hammer软件建立水锤计算模型,分别对管线首末两端阀门采用线性关闭、两阶段关闭2种关阀方案进行分析研究。结果表明,两阶段关阀方案明显优于线性关阀。首端阀门两阶段关闭时能够完全消除管线负压,更有利于工程的安全运行;末端阀门两阶段关闭时能有效降低水锤压力,减少关阀时间,提高系统响应速度,增加管道安全富裕度。

The problem of water hammer caused by valve closing in long-distance gravity flow water conveyance project has threatened the safety of water conveyance system. It is necessary to formulate a reasonable valve closing scheme to effectively reduce the impact of water hammer. Taking a long-distance gravity flow water conveyance project as an example, according to the basic principle of water hammer calculation, the water hammer calculation model was established by using Bentley Hammer software, and two valve closing schemes, linear closing and two-stage closing, were used to analyze the two end valves at the head and end of the pipeline. The results show that the two-stage valve closing scheme is obviously better than the linear valve closing scheme. The two-stage valve closing at the head end of the pipeline, the negative pressure of the pipeline can be completely eliminated, which is more conducive to the safe operation of the project;The two-stage valve closing at the end of the pipeline, it can effectively reduce the water hammer pressure, reduce the valve closing time, improve the response speed of the system, and increase the safety margin of the pipeline.