Morphology of deep-sea mining hydraulic conveying pipeline and its influencing laws in marine dynamic environment

Abstract

The hydraulic lifting pipeline, one of the key components of the slurry pump hydraulic lifting system, is taken as the research object in the paper. Based on the static characteristics of the hydraulic conveying pipeline, the spatial three-dimensional model of the hose is obtained. A geometric non-linear finite element model of the hydraulic lifting pipeline was established, and the static displacement of the hydraulic lifting pipeline under steady state was numerically simulated. The static characteristics of the pipeline were obtained, when the mining machine position, ocean current velocity and wave level were different. The numerical simulation of the response of the hydraulic lifting pipeline under dynamic excitation was performed, and the flow characteristics of the flow field in the pipeline under wave loading were obtained. A solid-liquid two-phase flow control equation for a slurry pump based on the Euler model is established, and the solid-liquid two-phase fluid in the hose is numerically simulated. The results show that the change of the position of the mining machine has little effect on the lateral displacement and bending stress of the hard tube, but has large impact on the pressure distribution, solid-phase velocity field distribution and pressure loss in the pipeline. The change of the ocean current has little effect on the spatial shape of the hose and the lateral displacement of the hard tube, but has great impact on the pressure loss in the pipeline. The wave level has great influence on the spatial shape of the hose and the lateral displacement of the hard tube. The pressure loss caused by changes in ocean current and wave level can be reduced by changing the position of the mining machine.

Keywords

deep-sea mining / marine dynamic environment / pipeline shape / flow field distribution / pressure loss

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