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首页> 外文期刊>Proceedings of the Institution of Civil Engineers >Monont'sa pumped-storage power project, Lesotho
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Monont'sa pumped-storage power project, Lesotho

机译：莱索托Monont的抽水蓄能发电项目

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摘要

This paper describes the pre-feasibility design of a high-head pumped-storage scheme in Lesotho. The underground powerhouse accommodates four 300 MW Francis pump turbines of regulated double-stage type achieving net heads of 723 m and 696 m in pumping and generating modes, respectively. Power drawn from the grid at off-peak periods will be regenerated at peak periods. The generation capacity is 1200 MW for 21 h. Roller-compacted concrete and concrete-faced rock-fill dams were selected for the particular reservoir sites. The headrace and tailrace tunnels, pressure shaft and manifold were concrete lined and sited where available minimum in situ rock stresses can safely contain internal pressures. Penstocks were steel lined. A twin-cavern arrangement was selected for the powerhouse set 800 m below ground. Features include downward demountable turbine runners in the machine cavern and rapid-acting bonneted draft tube gates accessed from the transformer cavern. A system of non-waterway tunnels provides access, separate emergency escape, ventilation and power cable routing to the surface switchyard. This paper addresses the energy characteristics and cycle efficiency of the project, and the considerations involved in the selection of the hydro-mechanical plant, electro-mechanical plant and civil works.
机译：本文介绍了莱索托的高扬程抽水蓄能方案的预可行性设计。该地下厂房可容纳四台300 MW调节双级混流式混流式水轮机，在抽水和发电方式下的净水头分别为723 m和696 m。在非高峰时段从电网汲取的电力将在高峰时段再生。 21小时的发电量为1200 MW。对于特定的水库场址，选择了碾压压实混凝土和混凝土面板堆石坝。头种族和尾种族隧道，压力井和歧管都衬有混凝土衬里，并放置在可利用的最小现场岩石应力可安全地包含内部压力的位置。压力管道用钢衬里。地下室800 m处的发电站选择了双洞穴布置。其功能包括在机器洞穴中可向下拆卸的涡轮机流道，以及从变压器洞穴中进入的快速作用阀盖通风管闸门。非水路隧道系统提供了通往地面开关站的通道，独立的紧急逃生通道，通风系统和电源电缆。本文讨论了该项目的能源特性和循环效率，以及水力机械厂，机电厂和土建工程的选择考虑因素。

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