【摘要】：在供水安全日益為人們所重視的今天,如何提高城市供水的安全保障率,越來越引起各個水司重視。近年,各地長距離調(diào)水工程不斷涌現(xiàn),一方面解決了當(dāng)?shù)厮Y源不足、水質(zhì)惡劣、季節(jié)性缺水等問題,但另一方面長距離輸水工程由于距離長、水力元件多、運行工況多等原因也帶來了很多系統(tǒng)的問題,由于關(guān)停泵、啟閉閥門、調(diào)整工況等引起的水錘便是其中之一。水錘引起的破壞力非常大,輕則造成機組損害、效率下降、管道破壞、壽命縮短,重則造成水淹城鄉(xiāng)、供水中斷,對生命及財產(chǎn)安全造成極大影響。因此,對于原水管線,預(yù)防水錘發(fā)生極為重要,水錘影響和防護是一個非常值得關(guān)注的問題。項目位于華南某市,該市總供水量約為100×104m3/d。A泵站為該市主力原水泵站,泵站原水取自其上游的平原水庫甲,泵站供水規(guī)模為80×104m3/d,承擔(dān)著全年向B水廠供原水以及咸潮期同時向C水廠輸送甲水庫原水的任務(wù)。A泵站-B、C兩水廠的原水管線全長19042m,到C水廠的總管道長度為20897m,管徑為DN2200-DN1800。由于原水輸水管線較長,為消除水錘危害,經(jīng)過方案比較,選擇了沿線設(shè)置單向塔的形式,本文主要通過計算機模擬,計算出單向塔設(shè)置的合理參數(shù),并模擬出在由于泵站斷電及管路爆管等臨界條件下,系統(tǒng)水力變化過程,復(fù)核系統(tǒng)安全性,調(diào)整了原設(shè)計的單向塔參數(shù)。受到咸潮影響,該市原水調(diào)度存在咸潮期和非咸潮期工況轉(zhuǎn)換的問題,在咸潮期非咸潮期轉(zhuǎn)換時,系統(tǒng)的水力變化較大,本文對系統(tǒng)中閥門的合理關(guān)閥時間,以及在咸潮期非咸潮期工況轉(zhuǎn)換過程中運行工況調(diào)整時的系統(tǒng)安全性進行了校核。為輸水系統(tǒng)結(jié)構(gòu)布置、泵站和各類閥門的運行調(diào)節(jié)提供安全保證與科學(xué)準(zhǔn)則。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU991.39

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