【摘要】：未來(lái)科技城供水工程的主要任務(wù)是改造馬池口水源地水源井現(xiàn)狀,沿百葛路及順沙路新建輸水管線至未來(lái)科技城北側(cè)新建調(diào)蓄水廠,并采用合理的水資源配置方案,從而為未來(lái)科技城提供可靠的水源保證。未來(lái)科技城供水工程是保證供水安全,支撐未來(lái)科技城發(fā)展的需要。工程選取15眼水源井作為地下水水源,最大供水規(guī)模及水廠調(diào)蓄量均為4萬(wàn)方每天。各水源井通過(guò)現(xiàn)狀D線、C線輸水總管連接至新建管線,新建輸水管線總長(zhǎng)28.08km,其中DN900球墨鑄鐵管3.95km,DN800球墨鑄鐵管24.13km,自西向東,由高至低鋪設(shè)至未來(lái)科技城水廠前池,為水廠提供穩(wěn)定水源。水廠布置在未來(lái)科技城西北角,廠內(nèi)設(shè)置八臺(tái)供水泵,六用兩備,水廠出口設(shè)置測(cè)壓點(diǎn),根據(jù)泵站出口壓力信號(hào),采用變頻恒壓供水方式向科技城內(nèi)用戶提供生活用水。本論文結(jié)合未來(lái)科技城供水工程設(shè)計(jì)實(shí)例,就恒壓供水方式對(duì)整個(gè)供水系統(tǒng)的影響等關(guān)鍵問(wèn)題進(jìn)行了較為系統(tǒng)的研究,分析供水系統(tǒng)中各個(gè)參數(shù)對(duì)系統(tǒng)的影響,研究類似工程中的水泵、變頻與調(diào)流閥的聯(lián)合控制等問(wèn)題。對(duì)水泵進(jìn)行調(diào)速性能曲線擬定,通過(guò)對(duì)各水泵并聯(lián)曲線擬合,通過(guò)作圖法求出調(diào)速比,對(duì)整個(gè)輸水系統(tǒng)建立模型,進(jìn)行輸水系統(tǒng)過(guò)度過(guò)程計(jì)算及分析;對(duì)低流量工況下,工頻與變頻對(duì)系統(tǒng)的影響進(jìn)行了對(duì)比。簡(jiǎn)要闡述了輸水系統(tǒng)中封閉管道流體數(shù)學(xué)模型的原理及分析過(guò)程。本文通過(guò)理論分析、數(shù)值計(jì)算等,提出了未來(lái)科技城供水工程過(guò)渡過(guò)程計(jì)算的分析結(jié)果,為長(zhǎng)距離輸水工程設(shè)計(jì)及運(yùn)行管理提供了科學(xué)依據(jù)及技術(shù)支撐。主要研究結(jié)論如下:(1)對(duì)于水源地高于水廠,在流量較低的工況,會(huì)產(chǎn)生管路的脫流現(xiàn)象,應(yīng)設(shè)置在管線末端設(shè)置調(diào)流閥避免脫流現(xiàn)象的發(fā)生,同時(shí)針對(duì)不同工況,對(duì)調(diào)流閥進(jìn)行特性曲線擬定。(2)對(duì)于多個(gè)水源井同時(shí)向輸水管路供水的工況,水源井深井泵應(yīng)配置變頻器,通過(guò)調(diào)速運(yùn)行恒壓供水減小對(duì)整個(gè)輸水管路的影響。(3)對(duì)于多個(gè)水源井同時(shí)向輸水管路供水的工況,在啟泵與停泵的過(guò)程中,應(yīng)逐一進(jìn)行水泵的啟停,并應(yīng)有相應(yīng)的間隔時(shí)間。(4)提出了輸水系統(tǒng)及水廠的調(diào)試運(yùn)行方案。
[Abstract]:The main task of the water supply project in the future science and technology city is to transform the present situation of the water source well in the Marchikou water source area, build a new water pipeline along Baige Road and Shunsha Road to build a new water transfer and storage plant on the north side of the future science and technology city, and adopt a reasonable water resources allocation scheme. So as to provide a reliable water source guarantee for the future science and technology city. The future water supply project of science and technology city is to ensure the safety of water supply and support the development of science and technology city in the future. Fifteen water source wells are selected as groundwater sources, and the maximum water supply scale and water plant storage capacity are 40,000 square per day. Each water source well is connected to the new pipeline through the present D line, the C line water main pipe is connected to the new pipeline, the total length of the newly built water pipeline is 28.08km, in which DN900 nodular cast iron pipe is 3.95km, DN800 nodular cast iron pipe is 24.13km, from west to east, From high to low laying to the future science and technology city water plant front pool, for the water plant to provide a stable water source. The water plant is arranged in the northwest corner of the future science and technology city, and eight water supply pumps are set up in the plant, and the pressure measuring points are set up at the outlet of the water plant. According to the outlet pressure signal of the pumping station, the water supply mode of frequency conversion and constant pressure is adopted to provide domestic water to the users in the science and technology city. Based on the design example of water supply project in science and technology city in the future, this paper makes a systematic study on the influence of constant pressure water supply mode on the whole water supply system, and analyzes the influence of each parameter in the water supply system on the system. The combined control of pump, frequency conversion and current regulating valve in similar projects is studied. The speed regulation performance curve of the pump is drawn up, and the speed regulation ratio is obtained by fitting the parallel curve of each pump, and the model of the whole water transmission system is established, and the excessive process of the water transmission system is calculated and analyzed. The influence of power frequency and frequency conversion on the system is compared under the condition of low flow rate. The principle and analysis process of closed pipeline fluid mathematical model in water transmission system are briefly described. Through theoretical analysis and numerical calculation, this paper puts forward the analysis results of the transition process of water supply project in science and technology city in the future, which provides scientific basis and technical support for the design and operation management of long distance water transmission project. The main conclusions are as follows: (1) for the condition that the water source is higher than the water plant, the drain phenomenon of the pipeline will occur in the condition of low flow rate, and the flow regulating valve should be set at the end of the pipeline to avoid the occurrence of the deflow phenomenon, and at the same time, according to different working conditions, Draw up the characteristic curve of the regulating valve. (2) for the condition that multiple water source wells supply water to the pipeline at the same time, the deep well pump of the water source well should be equipped with frequency converter. The influence of constant pressure water supply on the whole water transmission pipeline is reduced by speed regulation operation. (3) for the condition that multiple water source wells supply water to the pipeline at the same time, the starting and stopping of the pump should be carried out one by one in the process of starting and stopping the pump. There should be a corresponding interval. (4) the commissioning and operation scheme of the water transmission system and the water plant is put forward.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU991

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