發(fā)布時間：2018-09-12 18:52

【摘要】：泥沙在抽水蓄能電站中,一直備受研究者的關注。泥沙問題對抽水蓄能電站的危害主要是;一方面泥沙在庫區(qū)淤積,影響電站的庫容,對電站的運行造成一定影響(如張河灣抽水蓄能電站和潘家口混合式抽水蓄能電站);另一方面泥沙隨電站的運行進入抽水設備,對設備壽命造成致命影響(如蒲石河抽水蓄能電站)。在抽水蓄能電站前期的設計中,首要的問題是如何解決排沙設施、水輪機組的泥沙磨損預防及抗磨損研究、輸沙槽的優(yōu)化設計,以及排沙調度研究等。河工物理模型在研究水流結構、河床演變、泥沙淤積等問題上具有其他方法無法比擬的優(yōu)勢。本文依據(jù)模型相似理論,結合河南天池抽水蓄能電站水沙資料制作了河南天池渾水動床模型,并通過原型資料與試驗數(shù)據(jù)的對比,驗證了本次模型設計的可靠性。在模型設計可靠的基礎上,針對河南天池抽水蓄能電站經(jīng)過各長系列年中不同來水來沙條件下及典型洪水年調度運用后,對沖淤地形進行實測,用斷面法近似求得庫區(qū)各系列年末總體淤積分布以及各斷面間的淤積分布;并利用比重瓶法對各長系列年試驗過程中的沿程含沙量分布以及典型斷面的含沙量分布進行及時測定,并給出了限制電站運行下庫進水口的最高含沙量。結果表明:典型斷面和進出水口含沙量分布的增加成指數(shù)形式增加。
[Abstract]:Sediment in pumped storage power station has been concerned by researchers all the time. On the one hand, the sediment accumulation in the reservoir area affects the storage capacity of the power station. The operation of the power station is affected to some extent (such as Zhanghewan pumped storage power station and Panjiakou hybrid pumped storage power station), on the other hand, the sediment enters the pumping equipment with the operation of the power station. A fatal effect on the life of equipment, eg a Pushihe pumped storage plant. In the early stage design of pumped storage power station, the most important problems are how to solve the problem of sand drainage facilities, sand erosion prevention and anti-wear research of hydraulic turbine unit, the optimization design of sediment conveyer channel, and the study of sediment discharge scheduling. The physical model of river engineering has incomparable advantages over other methods in the study of water flow structure, river bed evolution, sediment deposition and so on. Based on the similarity theory of the model and the hydro-sediment data of Tianchi pumped storage power station in Henan Province, the model of muddy hydrodynamic bed in Tianchi, Henan Province is made. The reliability of the model design is verified by comparing the prototype data with the experimental data. On the basis of reliable design of the model, the antisilt topography of Tianchi pumped Storage Power Station in Henan Province is measured under different conditions of water and sediment in each long series of years and after the operation of typical flood year. The total siltation distribution at the end of the year and the siltation distribution among the sections in the reservoir area are approximately obtained by using the cross-section method. The distribution of sediment concentration along the course of each long series of tests and the distribution of sediment content in typical sections are measured in time by using the method of specific gravity bottle. The maximum sediment concentration at the inlet of the reservoir under the limited operation of the power station is given. The results show that the distribution of sediment content in typical section and inlet and outlet increases exponentially.
【學位授予單位】：華北水利水電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV145;TV743

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