燕子崖电站防沙和排沙设施的选择

传统的防沙和排沙工程措施主要有定期冲洗式沉沙池和连续冲洗式沉沙池两种,这些传统技术不能满足高效节能的防沙和排沙要求。通过定期冲洗式沉沙池、连续冲洗式沉沙池、排沙漏斗进行比选,并通过水力计算和对比论证分析。结果表明:排沙漏斗产生稳定的螺旋流,水流流速较大,加速泥沙向中心的排沙底孔和漏斗底部运动;而定期冲洗式沉沙池、连续冲洗式沉沙池中不存在稳定的螺旋流。排沙漏斗具有结构紧凑,工程量和投资最少,泥沙分离率较大,耗水率较少,所以排沙漏斗是一种经济、高效节水的防沙和排沙设施。

Choice of sand control and desilting facilities in the Yanziya Power Station

One of engineering measures for sediment disilting is traditional periodic flushing.However,these traditional techniques cannot meet the requirements for high efficiency and energy conservation.Analysis is conducted to hydraulic calculation and comparative regular flushing desilting basin,continuous flushing desilt ing basin,and sand funnel selection,the results showed that the sand funnel generates stable spiral flow,larger flow velocity,acceleration of sediment to the center of the bottom of the funnel and outlet,but the stable spiral flows do not exist in regular flushing desilting basin and continuous flushing desilting basin.The sand funnel has the advantages of compact structure,engineering quantity and low investment,the sediment separation rate is maximum,minimum water consumption rate.As a result,the sand funnel is economical and efficient water-saving sand flushing facility.