摘要
【目的】供水管网可靠性评估在供水系统的规划、设计和运行中起着重要作用。文章通过建立供水管网可靠性模型,对供水管网的可靠性进行综合评估。【方法】文章通过模型定义供水管网节点的水压可靠性、水量可靠性、余氯可靠性及水龄可靠性,进一步将节点的综合可靠性定义为水压可靠性、水量可靠性、余氯可靠性及水龄可靠性的最小值,最后将节点进行加权求和得到供水管网系统可靠性。通过编写MATLAB程序调用EPANET水力水质引擎,并应用于实际管网,采用蒙特卡洛模拟供水管网在稳态、非稳态、不确定情况下的水压、水量、余氯浓度及水龄,通过模型计算获得各节点的水压可靠性、水量可靠性、余氯可靠性及水龄可靠性,进一步得到节点综合可靠性和供水管网系统可靠性。【结果】在稳态情况下供水管网的综合可靠性为0.36,在基于所选需水模式的动态情况下供水管网的综合可靠性呈现2个波峰时间(5~6 h和15~16 h),2个波谷时间(9~10 h和23~24 h),在节点需水量具有不确定性时供水管网的综合可靠性为0.38。【结论】节点可靠性与节点在供水管网所处位置关系密切,越靠近管网末梢的节点水压可靠性、水量可靠性、余氯可靠性及水龄可靠性越低,余氯可靠性和系统可靠性与节点需水模式、余氯衰减规律等因素有关。该模型物理概念明确,计算简便,评价结果客观、合理。
[Objective]The reliability assessment of water supply networks plays an important role in the planning,design,and operation of water supply systems.In the paper,a reliability model of the water supply network is established to conduct a comprehensive assessment of the reliability of the water supply network.[Methods]In the paper,the water pressure reliability,water volume reliability,residual chlorine reliability and water age reliability of the water supply network nodes were defined through models.Further,the comprehensive reliability of the nodes was defined as the minimum values of water pressure reliability,water volume reliability,residual chlorine reliability and water age reliability.Finally,the weighted summation of the nodes was carried out to obtain the reliability of the water supply network system.By writing a MATLAB program to invoke the EPANET hydraulic water quality engine and applying it to the actual water supply network,Monte Carlo was used to simulate the water pressure,water volume,residual chlorine concentration and water age of the water supply network under steady-state,non-steady-state and uncertain conditions.The water pressure reliability,water volume reliability,residual chlorine reliability and water age reliability of each node were obtained through model calculation.Further obtain the comprehensive reliability of the nodes and the reliability of the water supply network system.[Results]The comprehensive reliability of the water supply network was 0.36 under steady-state conditions,and presents two peaks time(5-6 hours,15-16 hours)and two valleys time(9-10 hours,23-24 hours)under dynamic conditions based on the selected water demand mode.The comprehensive reliability of the water supply network was 0.38 when the node water demand is uncertain.[Conclusion]Reliability of nodes is closely related to their location in the water supply network.Nodes closer to the end of the network have lower water pressure reliability,water volume reliability,residual chlorine reliability,and water age reliability.Residual chlorine reliability and system reliability are related to factors such as node water demand patterns and residual chlorine attenuation rules.This model has clear physical concepts,simple calculations,and objective and reasonable evaluation result.
作者
陈晓晨
CHEN Xiaochen(Shanghai Lingang Water Supply and Drainage Development Co.,Ltd.,Shanghai 201306,China)
出处
《净水技术》
2025年第8期63-68,共6页
Water Purification Technology
关键词
供水管网
可靠性
水压可靠性
水量可靠性
水质可靠性
water supply pipelines network
reliability
water pressure reliability
water quantity reliability
water quality reliability
