淹没高压水射流清洗地浸生产井过滤器的数值分析

Numerical Analysis of Cleaning In-Situ Leaching Well Filter by Submerged High-Pressure Waterjet

采用数值模拟方法,利用Fluent软件对300 m水深的淹没高压水射流清洗地浸过滤器的流场特性进行分析,对比了不同喷嘴直径、喷嘴压降、冲击偏角和冲击靶距对污垢的冲击压力、剪应力、有效去污面积等去污指标的影响。结果显示,喷嘴直径从1.0 mm增至2.0 mm,射流最大冲击压力、最大径向速度和有效清洗长度分别增加22.15%、27.59%和905.46%;增大喷嘴压降会增强射流冲击压力,提高射流去污能力;适当增大冲击偏角可以增强靶面剪应力,冲击偏角30°左右时去污效果较好;有效去污面积随冲击靶距增加整体呈先增大后减小的趋势。数值仿真分析结果表明,采用淹没高压水射流去除地浸生产井过滤器上的堵塞物是可行的。分析数据可为清洗喷嘴的设计及清洗工作参数的选取提供一定参考依据。

By numerical simulation, the flow field characteristics of high-pressure waterjet submerged in water at a depth of 300 m used to clean the in-situ leaching well filter was analyzed with the Fluent software. The effects of outlet diameters and pressure drop of nozzle, deflection angle of impact and target distance on the impact pressure, shear stress, effective decontamination area among other important decontamination indexes were investigated. The results show that as the nozzle outlet diameter increases from 1.0 mm to 2.0 mm, the maximum impact pressure and the maximum radial velocity of the waterjet, as well as the effective cleaning area can be increased by 22.15%, 27.59%, and 905.46%, respectively. And the impact pressure and cleaning ability of waterjet can be improved by increasing the pressure drop of a nozzle. The shear stress of the target surface can be increased by appropriately increasing the deflection angle of impact, and it is shown a deflection angle of impact at around 30° can lead to a better decontamination effect. The effective decontamination area decreases after an initial increase as the target distance of impact increases. The numerical simulation analysis results indicate that it is feasible to use submerged high-pressure waterjet to remove the blockage in in-situ leaching well filter. The analysis data can provide a certain reference for the design of cleaning nozzles and the selection of cleaning parameters.