【摘要】：城市供水對保證工業(yè)生產和市民的健康生活有著重要的作用,而供水管網的“老齡化”給城市供水帶來了新的挑戰(zhàn)。特別是鋪設鑄鐵管的供水管道,在服役一段時間后會出現管內腐蝕結垢、供水壓力降低,有時候還會出現“黃水”和“紅水”。因此,對供水管線進行更新改造日益受到人們的重視。噴涂修復工藝采用環(huán)氧樹脂涂料,利用內旋風技術,首先帶動石英砂打磨管線內壁,起到除銹效果,然后將環(huán)氧樹脂涂料均勻地涂在管線內壁,在涂料干燥后形成內襯保護層,保護膜光滑致密、保護性能好、使用壽命長。本文以研究舊鑄鐵管、水泥砂漿內襯鑄鐵管和環(huán)氧樹脂內襯鑄鐵管三種不同管材的溶出特性和環(huán)氧樹脂噴涂修復技術對供水管網水質和水壓的影響為目的。在實驗室內分別研究了浸泡時間長短、p H、溫度、初始余氯濃度和不同源水對不同管段水質的影響。生活小區(qū)噴涂實驗則在噴涂前后分別對水質水壓監(jiān)測點進行測量,然后分析這種噴涂技術對生活小區(qū)管網水質和水壓的實際影響。通過研究發(fā)現:環(huán)氧樹脂內襯鑄鐵管相比于舊鑄鐵管和水泥砂漿內襯鑄鐵管而言,表現出了一定的優(yōu)越性。如可以減小管網水余氯消耗、降低濁度和維持p H值穩(wěn)定、減少Fe和Mn的溶出。但是這種管材在使用的過程中會析出有機物,對供水造成潛在威脅。此外,在居住小區(qū)現場噴涂后,小區(qū)供水管網的節(jié)點壓力平均提高0.46m,可以改善水力條件,降低供水能耗。噴涂后1周TOC值降低為噴涂前的60%,Fe含量減小為原來的8%。對于余氯,噴涂改造后觀察到其含量有減小的趨勢,噴涂后1周余氯值為噴涂前的86%。對于濁度、p H、Mn、Cr、Pb和Cu等指標,在噴涂前后并沒有發(fā)生顯著的變化。
[Abstract]:Urban water supply plays an important role in ensuring industrial production and healthy life of citizens. The aging of water supply network brings new challenges to urban water supply. Especially for the water supply pipeline with cast iron pipe, corrosion and scaling will occur in the pipe after a period of service, and the pressure of water supply will be reduced, and sometimes "yellow water" and "red water" will appear. Therefore, people pay more and more attention to the renovation of water supply pipeline. Epoxy resin coating is used in spraying and repairing process. The inner wall of pipeline is first polished by quartz sand, and then the epoxy resin coating is evenly coated on the inner wall of pipeline, and the inner lining protection layer is formed after the paint is dried. The protective film is smooth and compact, with good protection performance and long service life. In this paper, the dissolution characteristics of three different kinds of pipes, old cast iron pipe, cement mortar lining iron pipe and epoxy resin lined iron pipe, and the effect of epoxy resin spray repair technology on water quality and water pressure of water supply network are studied. The effects of soaking time, p H, temperature initial residual chlorine concentration and different source water on the water quality of different pipe segments were studied in the laboratory. Before and after spraying, the water quality and water pressure monitoring points were measured, and then the actual influence of this spraying technology on the water quality and water pressure of the living district pipe network was analyzed. It is found that the epoxy resin cast iron pipe is superior to the old cast iron pipe and the cement mortar inner cast iron pipe. For example, the residual chlorine consumption of water can be reduced, turbidity can be reduced, pH value can be kept stable, and the dissolution of Fe and Mn can be reduced. However, the pipes in the process of use will precipitate organic matter, posing a potential threat to water supply. In addition, after spraying on site in residential area, the node pressure of water supply network in residential area is increased by 0.46 m on average, which can improve hydraulic conditions and reduce energy consumption of water supply. At 1 week after spraying, the TOC value decreased to 60% Fe content before spraying and decreased to 8%. For residual chlorine, it was observed that the content of residual chlorine decreased after spraying, and the residual chlorine value of one week after spraying was 86% of that before spraying. For turbidity, there was no significant change in turbidity, such as Pb and Cu before and after spraying.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU991.21

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