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针对塔贝拉水电站四期扩建工程中#4引水洞改建的清淤区域远离库岸、水深大、范围集中、总量少、库底水工建筑物保护要求高等特点,研制了基于空气提升原理的清淤系统,该系统利用高压水流冲射、破碎淤积体,并利用压缩空气形成高压小气泡在清淤管内不断上升、聚合,推动气—液—固三相连动上升,经吸泥管将泥水混合物排放到排泥场,从而达到清淤目的。实际应用结果表明,该系统在2个月内有效清除封堵闸槽顶部和内部的淤积体约8 800m~3,取得了理想的清淤效果,具有显著的综合效益。
In view of the characteristics of the dredging area of # 4 diversion tunnel remodeling in the fourth phase of the expansion project of Tarbela Hydropower Station, which is far away from the reservoir bank, large water depth, concentrated area, small total amount and high protection requirements of hydraulic structures at the bottom of the reservoir, Of the system, the system uses high-pressure water jet shot, crushed silt body, and the use of compressed air to form high-pressure small bubbles in the dredging pipe rising, polymerization, promoting the gas - liquid - solid three-phase linked rise, Slurry mixture discharged to the mud field, so as to achieve the purpose of dredging. The practical application shows that the system effectively removes about 8 800 m ~ 3 of sediment from the top and the interior of the sluice in 2 months and achieves an ideal dredging effect with a significant overall benefit.