深海采矿中试系统水力提升管道水击压力分析

深海采矿系统可能由于突然停泵、断电或机械故障等引起提升管道中流体速度瞬间变化, 导致管道内压力剧烈变化, 这种水击现象对管道破坏极大. 基于固液两相流体连续性原理和动量定理, 推导出含粗颗粒的固液两相流体管道水击压力的计算公式. 采用深海采矿中试系统参数, 模拟计算不同水体流速、不同流体浓度以及不同管径条件下的水击压力. 分析结果表明, 流速、体积浓度和管径是影响水击压力的重要因素, 其中, 流速影响最大. 研究结果可为深海采矿系统工程设计提供依据.

WATER HAMMER PRESSURE OF HYDRAULIC LIFTING PIPELINE IN DEEP-SEA MINING PILOT SYSTEM

Due to the sudden shutdown of pump, the power off or the mechanical failure, the flow velocity in the lifting pipeline of a deep-sea mining system may be changed in short time, which can be accompanied with a sharp pressure change. This phenomenon, the water hammer, may cause a great damage to the mining system. Based on the principles of continuity and momentum theorems of solid-liquid two-phase flow, a formula of water hammer pressure is derived for the lifting pipeline with coarse solid. By using the parameters of the pilot system, the water hammer pressure is calculated and analyzed under the conditions of different flow velocities, solid volume concentrations and pipe diameters. The results show that the parameters are important factors to the water hammer pressure, including the flow velocity, the solid volume concentration and the pipe diameter, especially, for the flow velocity. The results can provide some references for deep-sea mining system designs and safety risk analysis.