基于节点水龄分析的供水管网水质优化技术研究

发布时间：2018-05-05 12:48

本文选题：供水管网 + 节点水龄　；参考：《青岛理工大学》2013年硕士论文

【摘要】：自来水厂处理达标后的生活饮用水，，经过错综复杂的城市供水管网系统输送到用户的过程中，在管道中会发生一系列的物理、化学和生物反应，供水水质会发生一定的变化，甚至一些供水点会发生水质不达标的现象。因此，加强供水管网水质的监测运行管理，研究供水管网水质优化技术，分析、模拟从而进一步改善供水管网水质是十分必要的。本文以黄河下游某大城市多水源局部供水管网为研究对象，以供水管网水质为研究目标，建立管网模型模拟分析实例供水管网的水质情况，以节点水龄为水质参数，研究了水龄的计算方法、变化规律，及余氯随节点水龄的变化规律，为应用节点水龄评价管网水质、加强供水管理提供了可靠的理论基础，也为水质安全保障及供水系统的调度管理提供了技术支撑，对于供水企业提高供水水质具有重要的现实意义。首先，论文研究了节点水龄在供水管网领域的研究及应用现状，了解到国内外对节点水龄的研究还不够深入，但供水管网中节点水龄的特性及其与余氯等水质参数的关系，决定了其作为一个管网水质参数，对于供水管网水质分析及优化有很重要的作用。因此，论文随后主要研究了节点水龄的计算方法问题，发现了现有计算方法的不足，在总结既有计算方法的基础上，提出了应用定义法来计算节点水龄的方法，并利用MFC界面开发系统将计算结果进行了可视化。其次，在准确计算节点水龄值后，论文主要研究的是供水管网节点水龄的变化规律问题。包括不同复杂程度的供水管网系统——简单管网或多水源大型复杂管网系统；同一管网系统中不同位置的节点——临近水源的节点或是管网末梢节点，以及管网系统中的普通节点等。发现不同管网、相同管网中的不同节点表现出的节点水龄变化规律不同，主要有突变性变化、周期性变化、线性变化及与供需水量相关的变化规律。再次，不论是研究节点水龄的计算方法，还是分析不同管网系统不同节点的水龄变化规律，研究中都应用到了论文所依托的管网系统——黄河下游某大城市多水源局部供水管网，因此论文又以余氯、铁离子、浊度为水质参数，分析该实例管网系统的水质现状，发现一些监测点个别时段余氯不达标，铁离子达标但仍需要尽量降低，浊度全部达标但相比与美国标准，还可以进一步改进。同时建立实例管网系统的水力水质仿真模型，利用EPANET2.0软件对其水质现状及余氯衰减情况进行模拟分析，确定了余氯衰减系数并运用余氯实测值对衰减系数进行了参数率定，为下一步研究余氯随节点水龄的变化规律及以节点水龄作为水质参数来分析供水管网系统水质情况做铺垫。最后，以上述研究内容为基础，论文分析了多水源多泵站供水的现状、优点及其可能遇到的问题，发现现在多数管网趋于多水源多泵站化，但伴随出现的问题就是水源水质不同，水源切换时很可能引起“黄水”问题。同时以黄河下游某大城市多水源局部供水管网为实例管网进行供水区域的划分，研究每个供水区域内，沿着水流方向从水源到管网末梢节点的余氯随节点水龄的具体变化关系，提出了具体函数关系式，发现结果与一些文章中叙述的简单的指数关系并不同，这为以节点水龄作为水质参数来描述供水管网水质变化，评价供水管网水质情况提供了新的理论依据。
[Abstract]:In the process of handling the drinking water after reaching the standard, the water works will undergo a series of physical, chemical and biological reactions in the pipeline, and some changes in water quality will occur in the pipeline, and the water quality will not reach the standard in some water supply points. Therefore, the water supply network will be strengthened. It is necessary to study the water quality optimization technology of water supply network, analyze and simulate the water quality of water supply network. This paper takes the local water supply network of a large city in a large city of the lower reaches of the Yellow River as the research object, takes the water quality of the water supply network as the research target, and establishes a pipe network model to simulate and analyze the water supply network. According to the water quality of the node, the calculation method, the change law of the water age and the change rule of the residual chlorine with the age of the node water are studied. It provides a reliable theoretical basis for evaluating the water quality of the pipe network with node water age and strengthening the water supply management. It also provides technical support for the water quality safety protection and the dispatching management of the water supply system. It is of great practical significance for water supply enterprises to improve the quality of water supply.
First, the paper studies the research and application status of node water age in the field of water supply network. It is found that the research on the age of node water age at home and abroad is not enough, but the characteristics of the water age of nodes in the water supply network and the relationship between the water age of the node and the water quality parameters such as the residual chlorine determine the water quality of the pipe network as a water quality parameter and the water quality analysis and optimization of the water supply network. Therefore, the paper then mainly studied the calculation method of the node water age, found the shortage of the existing calculation method. On the basis of summing up the existing calculation method, the method of calculating the node water age with the application definition method was put forward, and the calculation results were visualized by using the MFC interface opening system.
Secondly, after calculating the node's water age accurately, the paper mainly studies the change law of the water age of the node of the water supply network, including the water supply network system of different complexity - the simple pipe network or the large and complex pipe network system of multi water source; the nodes of different positions in the same pipe network - the nodes near the water source or the end of the pipe network The tip nodes and common nodes in the pipe network system have found that the changes in the water age of the nodes in the different pipe network and the same pipe network are different, such as abrupt change, periodic change, linear change and the law of change related to the water supply and demand.
Again, whether it is the calculation method of the water age of the study node, or the analysis of the changing law of the water age of different nodes of different pipe network systems, the study is applied to the pipe network system supported by the paper, the water supply network of a large city in a large city in the lower reaches of the Yellow River, so the paper also uses the residual chlorine, iron ion and turbidity as the water quality parameters to analyze the example The water quality status of the pipe network system is found to be not up to the standard of residual chlorine in some monitoring points, but the iron ion reaches the standard but still needs to be reduced as far as possible. All the turbidity reaches the standard but compared with the American Standard, it can be further improved. At the same time, the water quality simulation model of an example pipe network system is set up, and the water quality status and the decay of the residual chlorine can be attenuated by the EPANET2.0 software The condition is simulated and analyzed. The attenuation coefficient of residual chlorine is determined and the parameter rate of the attenuation coefficient is determined by using the measured value of residual chlorine. The next step is to study the change rule of the residual chlorine with the water age of the node and to make the paving for the water quality of the water supply network system by the node water age as the water quality parameter.
Finally, based on the above research content, the paper analyzes the current situation of water supply in multi source and multi pumping stations, its advantages and possible problems. It is found that most of the pipe networks now tend to multi source and multi pumping station, but the problem is that the water quality is different and the water source can cause "yellow water" problem when the water source is switched. At the same time, a large amount of water in the lower reaches of the Yellow River can be found. The urban multi water source local water supply network divides the water supply area into the pipe network. In each water supply area, the specific relation formula of the residual chlorine of the node in the water flow direction from the water source to the end of the pipe network is put forward. The result is different from the simple index described in some articles. This provides a new theoretical basis for describing the change of water quality of water supply network and evaluating the water quality of water supply network by using node water age as a water quality parameter.

【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】：TU991.2

【参考文献】