超高水头水泵水轮机型式及比转速选择

Selection of the type and specific rotation speed of super high head pump turbine

长泰抽水蓄能电站装机1800MW,最大动扬程896m,如采用单级混流可逆水泵水轮机并按统计公式计算其水泵比转速为2759m·m3/s,显然偏低。当采用2级水泵水轮机时水泵比转速可达373m·m3/s,此时机组的效率可提高、尺寸减小、土建投资也可减少。2级可调导叶混流可逆水泵水轮机比不可调导叶的机组出力可提高15%;水泵起动时可关闭导叶,起动功率只有最大功率的15%,而不可调导叶的将达65%～70%。长泰抽水蓄能电站经综合比较初步推荐2级可调导叶混流可逆式水泵水轮机,单机容量300MW。该种机组目前国内外尚无实例。在建的韩国一抽水蓄能电站,水头816m,装机4台,单机容量为250MW,选用2级可调导叶混流式可逆机组,将于2001年投产。

The Changtai Pumped storage Power Plant has the installed capacity of 1 800 MW with the maximum dynamic lift of 896 m If the plant uses the single stage mixed flow reversible pump turbine, the specific rotation speed of the pump will be 27 59 m·m 3/s according to the calculation and will be in the low side If it uses the two stage pump, its specific rotation speed will be up to 37 3m·m 3/s Thus the efficient of the generating unit will be increased, its dimensions reduced and its civil investment lowered The two stage mixed flow reversible pump turbine with adjustable blade could increase 15% output more than that with non adjustable blade Because the blade will be closed when the pump starts, the starting power is only 15% of its maximum power But for the pump with non adjustable blade, its starting power will be 65% 70% of the maximum power According to the comprehensive comparison, it is recommended for the Changtai Pumped storage Power Plant to use two stage mixed flow reversible pump turbine with adjustable blade, with an installed capacity of 300 MW each At present, no such generating unit has been put into operation at home and abroad In the Republic of Korea, a under construction pumped storage power plant with the installed capacity of 4×250MW and the water head of 816 m will use the two stage mixed flow reversible generating unit with adjustable blade and will be put into operation by the year of 2001