华南某市原水管线水力过渡过程计算复核

发布时间：2018-07-23 13:59

【摘要】：在供水安全日益为人们所重视的今天,如何提高城市供水的安全保障率,越来越引起各个水司重视。近年,各地长距离调水工程不断涌现,一方面解决了当地水资源不足、水质恶劣、季节性缺水等问题,但另一方面长距离输水工程由于距离长、水力元件多、运行工况多等原因也带来了很多系统的问题,由于关停泵、启闭阀门、调整工况等引起的水锤便是其中之一。水锤引起的破坏力非常大,轻则造成机组损害、效率下降、管道破坏、寿命缩短,重则造成水淹城乡、供水中断,对生命及财产安全造成极大影响。因此,对于原水管线,预防水锤发生极为重要,水锤影响和防护是一个非常值得关注的问题。项目位于华南某市,该市总供水量约为100×104m3/d。A泵站为该市主力原水泵站,泵站原水取自其上游的平原水库甲,泵站供水规模为80×104m3/d,承担着全年向B水厂供原水以及咸潮期同时向C水厂输送甲水库原水的任务。A泵站-B、C两水厂的原水管线全长19042m,到C水厂的总管道长度为20897m,管径为DN2200-DN1800。由于原水输水管线较长,为消除水锤危害,经过方案比较,选择了沿线设置单向塔的形式,本文主要通过计算机模拟,计算出单向塔设置的合理参数,并模拟出在由于泵站断电及管路爆管等临界条件下,系统水力变化过程,复核系统安全性,调整了原设计的单向塔参数。受到咸潮影响,该市原水调度存在咸潮期和非咸潮期工况转换的问题,在咸潮期非咸潮期转换时,系统的水力变化较大,本文对系统中阀门的合理关阀时间,以及在咸潮期非咸潮期工况转换过程中运行工况调整时的系统安全性进行了校核。为输水系统结构布置、泵站和各类阀门的运行调节提供安全保证与科学准则。
[Abstract]:Nowadays, people pay more and more attention to the safety of water supply, how to improve the safety and security rate of urban water supply has attracted more and more attention of water departments. In recent years, local long-distance water transfer projects have been emerging. On the one hand, the problems of insufficient local water resources, poor water quality and seasonal water shortage have been solved, but on the other hand, because of the long distance, there are many hydraulic components in long-distance water conveyance projects. There are many problems caused by many operating conditions, such as water hammer caused by shut-down pump, opening and closing valve, adjusting working condition and so on. The damage caused by water hammer is very large, which causes damage to unit, decrease of efficiency, damage of pipeline, shortening of life span, heavy water supply interruption, and great influence on life and property safety. Therefore, it is very important to prevent the occurrence of water hammer for raw water pipeline. The project is located in a city in South China. The total water supply in this city is about 100 脳 104m3/d.A pumping station, which is the main raw water pumping station in the city. The raw water of the pumping station is taken from the plain reservoir in the upper reaches of the pump station. The water supply scale of pumping station is 80 脳 10 ~ 4 m ~ 3 / d, which undertakes the task of supplying raw water to B water plant and transporting the raw water of reservoir A to C water plant at the same time during the salty tide period. The total length of the raw water pipeline of the two water works of BU C and B pump station is 19042 m, and the total pipeline length to C water works is 20897m.The pipe diameter is DN2200-DN18000.The total length of the water supply line is 20897m. the pipe diameter is DN2200-DN1800. Because the raw water pipeline is long, in order to eliminate the harm of water hammer, the form of unidirectional tower is selected through the comparison of schemes. The reasonable parameters of the setting of unidirectional tower are calculated by computer simulation in this paper. Under the critical conditions of pump station power failure and pipe burst, the hydraulic variation process of the system and the safety of the system are checked, and the parameters of the original one-way tower are adjusted. Under the influence of saltwater tide, the operation of raw water in this city has the problem of changing the working conditions of saltwater tide period and non-salty tide period. When the saltwater tide period is not salty tide period, the hydraulic change of the system is great. In this paper, the reasonable valve closing time of the valve in the system is discussed. The safety of the system is checked when the operating conditions are adjusted during the conversion of the non-saltwater tide conditions during the saltwater tide period. It provides safety assurance and scientific criterion for the structure arrangement of water conveyance system, operation and regulation of pump station and all kinds of valves.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.39

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