供水管网减压阀优化控制漏失研究

发布时间：2018-01-10 09:13

  本文关键词：供水管网减压阀优化控制漏失研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 供水管网 漏失控制 压力管理 减压阀 NSGA-Ⅱ 粒子群算法

【摘要】：在用水需求不断增长、水资源日益稀缺的今天，城市供水管网漏失控制越来越受到国内外供水行业的高度重视。供水管网漏失水平主要取决于管道物理属性和管网运行条件参数，其中管网压力是一项较为重要的影响因素，降低管网服务压力可有效减少漏失量。对此，本文以管网减压阀优化控制作为核心研究内容，旨在达到节约水资源、提高供水企业经济效益的目的。 分区降压潜力测试是进行供水管网压力管理的第一步，可以为判断分区是否需要实施压力管理提供有力的理论依据。本文详细论述分区降压潜力测试的准备工作及操作步骤，并以某供水系统为例进行分区降压潜力测试，初步确定管网降压潜力的大小以及压力管理可获得的经济效益。根据分析结果认为该分区管网漏失与压力之间存在较大的正相关性，进行管网压力管理是十分必要的。 在分区降压潜力测试之后，需要对减压阀合理的安装数量和位置做出评估。对此本文首先结合传统水力模型和夜间最小流量法求得管网节点的漏失系数，建立考虑压力相关漏失量的改进水力模型。进一步提出减压阀优化控制模型，该模型以管网漏失及减压阀投资成本最小化作为两个目标函数，以减压阀启闭和开启时各时段的出口压力控制值作为决策变量，以节点压力为约束条件，采用NSGA-Ⅱ算法进行求解。最后通过实例管网详细论述减压阀优化控制模型的求解过程。 根据上述模型计算结果，可获得减压阀最优的安装数量和位置，但仍需要进一步确定减压阀安装后的出口压力控制值，从而建立压力管理的完整体系。对此本文分别提出基于流量和时间调节的分区现场减压阀优化控制方法，并分别采用粒子群算法和统计分析方法进行求解，得出减压阀的最优流量控制曲线或时间控制方案。对实例管网进行分区现场减压阀优化控制方法研究，，结果表明减压控制策略实施后管网漏失下降显著。 最后将管网压力管理体系应用于某二级分区供水管网，得到该区域管网减压阀的安装位置和设置方案。结果表明压力管理的应用效果良好，能有效达到降低管网漏失和爆管率、提高供水安全性的效果。
[Abstract]:In the growing demand for water, water resources are becoming increasingly scarce today. The leakage control of urban water supply network is paid more and more attention by domestic and foreign water supply industry. The leakage level of water supply network mainly depends on the physical properties of pipeline and the parameters of network operation conditions. The pipe network pressure is a relatively important factor, reducing the network service pressure can effectively reduce the leakage. In this paper, the optimization control of the pipe network pressure relief valve as the core research, in order to achieve water resources conservation. The purpose of improving the economic benefit of water supply enterprises. The pressure reduction potential test is the first step in the pressure management of water supply network. It can provide a powerful theoretical basis for judging whether or not pressure management should be carried out. This paper discusses in detail the preparation and operation steps of the sub-area pressure reduction potential test. A water supply system is taken as an example to test the potential of pressure reduction. The potential of pressure reduction and the economic benefits of pressure management are preliminarily determined. According to the analysis results, there is a large positive correlation between leakage and pressure in the district pipe network. It is necessary to manage the pressure of pipe network. After the pressure reduction potential test, the reasonable installation number and location of the pressure reducing valve should be evaluated. Firstly, the leakage coefficient of the pipe network node is obtained by combining the traditional hydraulic model and the nocturnal minimum flow method. An improved hydraulic model considering pressure-related leakage is established, and an optimal control model of pressure reducing valve is proposed. The model takes the leakage of pipe network and the minimization of investment cost of pressure relief valve as two objective functions. The outlet pressure control value during the opening and closing of the pressure reducing valve is taken as the decision variable and the node pressure is taken as the constraint condition. NSGA- 鈪

本文编号：1404671