可调射流泵在水电站技术供水中的应用研究

Applied Research on Adjustable Jet Pumps for Cooling Water Supply in Hydroelectric Power Stations

可调射流泵装置把水电站上游水库水作为动力源,抽吸下游尾水,两股水流均匀混合后为水电站提供冷却水。当电站上下游水位变化时,通过调节可调射流泵喷针开度能维持水电站技术供水压力和流量的稳定,而不可调射流泵却不能。可调射流泵的性能与相同面积比的不可调射流泵有很大不同,可调射流泵的设计计算中不能再照搬不可调射流泵的理论。介绍了可调射流泵的工作原理、设计理论和设计方法。利用该设计理论和方法,结合越南某原型水电站进行了可调射流泵及其自动控制系统的设计,实际运行效果良好。对同类水电站技术供水系统设计有一定的参考价值。

Tail water is pumped by adjustable jet pumps by using water from upper reservoir as driving water. Driving water and tail water are evenly mixed and supplied cooling water for turbine units. When the water level of upper or lower reaches of rivers of hy draulic power station changes, the adjustable jet pumps are different from non-adjustable jet pumps, they can maintain stable pres sure and flow rate for the system of cooling water supply of hydraulic power stations by adjusting the open degree of the spindle in nozzles. The performance of adjustable jet pump is very different from that of non-adjustable jet pumps under the condition of the same area ratio, so the theory of conventional jet pumps is not able to be copied in designing adjustable jet pumps. It is necessary to further study the performance of adjustable jet pumps. Working principle, design theory and design procedures of adjustable jet pumps are introduced. The system of adjustable jet pumps and its automatic control is designed and successfully applied to a proto type hydraulic power station in Vietnam. This paper has reference value for analogous design of cooling water supply of hydraulic power stations.