泾河东庄水电站水轮机参数初选

摘要

东庄水库电站运行水头高、变幅宽，过机泥沙含量大，水轮机过流部件将遭到磨蚀破坏。借鉴已运行的黄河小浪底、西霞院、万家寨等多泥沙电站水轮机参数选择和抗磨措施，分析电站主要参数，从保障安全运行、减轻磨蚀破坏的角度初步选定东庄电站发电机组的额定比转速、比速系数、单位转速、单位流量等参数。原型水轮机参数如下：型号HL%Dongzhuang Reservoir Power Station operates with high water head and wide amplitude. The sediment concentration passing through the turbines is high and the wet components of the turbines will be suffered abrasion damage. Learning from the Yellow River Xiaolangdi,Xixiayuan, Wanjiazhai Hydropower Station and other heavy sediment turbine parameters,it selected and adopted the anti abrasion measures. It analyzed the main parameters of power station,from the guaranteeing safe operation and reducing abrasion damage point of view and initially selected Dong-zhuang Power Station turbines rated than speed,coefficient of speed ratio,unit speed,unit flow and other parameters. Prototype turbine parameters are as follows:Model:HL(114)-LJ-230;Rated output Nr =41. 1 MW;rated head Hr =181 m;runner diameter D1 =2. 3 m;rated flow Qr =25. 25 m3/ s;rated efficiency ηr =91. 5%;rated speed nr =375 r/min;suction height Hs = -5. 88 m;apparatus cavitation coefficient σZ =0. 083 3;specific speed ns =114 m·kW;Coefficient of speed ratio k=1 539.