河南天池抽水蓄能电站库区含沙量分布及泥沙淤积分布试验研究

发布时间：2018-09-12 18:52

【摘要】：泥沙在抽水蓄能电站中,一直备受研究者的关注。泥沙问题对抽水蓄能电站的危害主要是;一方面泥沙在库区淤积,影响电站的库容,对电站的运行造成一定影响(如张河湾抽水蓄能电站和潘家口混合式抽水蓄能电站);另一方面泥沙随电站的运行进入抽水设备,对设备寿命造成致命影响(如蒲石河抽水蓄能电站)。在抽水蓄能电站前期的设计中,首要的问题是如何解决排沙设施、水轮机组的泥沙磨损预防及抗磨损研究、输沙槽的优化设计,以及排沙调度研究等。河工物理模型在研究水流结构、河床演变、泥沙淤积等问题上具有其他方法无法比拟的优势。本文依据模型相似理论,结合河南天池抽水蓄能电站水沙资料制作了河南天池浑水动床模型,并通过原型资料与试验数据的对比,验证了本次模型设计的可靠性。在模型设计可靠的基础上,针对河南天池抽水蓄能电站经过各长系列年中不同来水来沙条件下及典型洪水年调度运用后,对冲淤地形进行实测,用断面法近似求得库区各系列年末总体淤积分布以及各断面间的淤积分布;并利用比重瓶法对各长系列年试验过程中的沿程含沙量分布以及典型断面的含沙量分布进行及时测定,并给出了限制电站运行下库进水口的最高含沙量。结果表明:典型断面和进出水口含沙量分布的增加成指数形式增加。
[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.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV145;TV743

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