供水管网多事故点关阀策略及供水安全保障技术研究

发布时间：2018-10-09 12:24

【摘要】：随着城市化建设的进展，大量人口涌入城市，城市用水量日益增大，供水管网的供水负担不断加重，加之部分管段铺设年代较为久远，老化严重，，爆管事故时有发生。爆管事故不同于管网漏失，一旦发生，对管网的危害极大，需要迅速关阀抢修，并采取相应的应对措施，尽最大限度的减少经济损失。本文以多事故点关阀策略为核心，对多水源供水管网在事故前后的供水分区变化以及事故后的供水保障措施进行了研究，使之能够更好的应用于实际管网。对多水源管网的供水分区的研究，以图论为理论基础。供水管网的节点与管段相当于图论理论中的“点”和“弧”，将各节点之间的关系用邻接矩阵来表达，在EPANET管网模拟软件上建立管网模型，从一个水源节点开始，顺着流量的方向，逐一搜寻该水源的供水能够到达的节点，并找到供水分界点，根据分界点确定供水分区。运用广度优先搜索算法，对关阀策略展开研究。首先对单事故点的关阀策略进行研究，再以单事故点为基础，对多事故点的关阀策略展开研究。由于管网关系错综复杂，多事故点的关阀策略并不一定等同于各个单一事故点的单独策略的简单叠加。最终将关阀策略的算法做成DLL动态链接库文件，以实现算法的通用性，并使之能够被其他主程序调用，方便以后的研究。在形成了多事故点关阀策略之后，结合供水分区的算法，以几种不同类型事故的情况为例，形成事故后的供水分区，与正常状态下的供水分区相比，结合管网流向图，研究其变化，分析其成因，找出事故影响供水分区的主要因素，并从经济性和安全性两个方面，对事故时的管网优化调度进行简要探讨。由于事故的影响，管网的供水安全受到了很大的冲击，需从水力和水质两个方面对供水安全保障技术展开研究。水力方面以节点自由水压为对象，水质方面以余氯为对象，研究其在事故发生之后的变化，并提出相应的解决措施，使供水管网在事故发生后的关阀抢修阶段，仍能向事故影响区之外的管段和节点安全稳定的持续供水。
[Abstract]:With the development of urbanization, a large number of people pour into the city, the urban water consumption is increasing day by day, the water supply burden of the water supply network is increasing, in addition, some pipe sections are laid for a long time, aging is serious, pipe burst accidents occur from time to time. The accident of pipe burst is different from the leakage of pipe network. Once it happens, it will do great harm to the pipe network, so it is necessary to close the valve quickly and repair it quickly, and take corresponding measures to reduce the economic loss as far as possible. In this paper, the change of water supply zone before and after the accident and the water supply guarantee measures after the accident are studied based on the strategy of closing the valve at the multi-accident point, so that it can be better applied to the practical pipe network. The study of water supply zoning of multi-source pipe network is based on graph theory. The nodes and pipe segments of the water supply network are equivalent to the "points" and "arcs" in graph theory. The relationship between the nodes is expressed by the adjacency matrix, and the pipe network model is established on the EPANET pipe network simulation software, starting with a water source node. According to the flow direction, the water supply node of the water source is searched one by one, the water supply boundary point is found, and the water supply partition is determined according to the water supply boundary point. Using breadth-first search algorithm, the strategy of closing valve is studied. First, the strategy of closing valve at single accident point is studied, and then, based on single accident point, the strategy of closing valve in multiple accident point is studied. Due to the complexity of pipe network relationship, the closing valve strategy of multiple accident points is not necessarily equivalent to the simple superposition of individual strategies of each single accident point. Finally, the algorithm of closing valve strategy is made into DLL dynamic link library file, so that the algorithm can be universal and can be called by other main programs, which is convenient for future research. After forming the multi-accident point closing valve strategy, combined with the algorithm of water supply partition, taking several different types of accidents as an example, the water supply zone after the accident is formed. Compared with the normal water supply zone, the flow chart of pipe network is combined. This paper studies its change, analyzes its cause of formation, finds out the main factors that affect water supply zoning, and discusses briefly the optimal dispatching of pipeline network in the event of accident from the aspects of economy and safety. Due to the influence of accidents, the safety of water supply in the pipeline network has been greatly impacted. It is necessary to study the water supply security technology from the aspects of water power and water quality. The hydraulic aspect takes the joint free water pressure as the object, the water quality aspect takes the residual chlorine as the object, studies its change after the accident, and proposes the corresponding solution measure, causes the water supply network to close the valve to repair the stage immediately after the accident, Can still provide safe and stable water supply to pipes and nodes outside the accident-affected area.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.6

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