Applied Research Of Pipelines System Coarse Particles Solid-liquid Two-Phase Flows

Ocean poly-metallic nodule is a kind of deep-sea mineral resources which has thegreat value of mineral resources exploitation. In order to develop the mineral resources,several deep sea mining systems have developed around the world. The slurry pump pipesystem has advantages of simple technology, reliable work, high efficiency, continuousproduction and low pollution, the slurry pump hydraulic pipeline system is considered themost valuable transport technology. Actually, the lift technology is the application ofcoarse particle solid-liquid two phase flow in pipe transport system.Based on theoretical analysis, calculation method and test, the paper mainly studiesthe hydraulic characteristics of coarse particles in the vertical pipe. Main contents are asfollows:The test measures the ocean mineral density and grain grade, mechanical analysis ofcoarse particles in two-phase flow process. Through single particle sedimentation test andthe particle group of phytoplankton test, we get the drag coefficient of particle movement.And the application of B.B.O equation in solid-liquid two-phase flow of vertical pipes isdeduced.Coarse particles solid-liquid two-phase flow model of hydraulic lift pipe system isestablished, and the stress and the motion equation of coarse particles in two-phase flow isderived. When the pipe is tilted, slurry flow movement of nodule state in hydraulicascending pipe changes. The movement equation of coarse particles in inclined pipe isestablished, and experiments validate the friction of the inclined pipe.Through the experiment, we study the hydraulic ascending parameters of hydraulicascension in piping system, and analyze the test results, and summarize the correlation ofnodule particle and concentration for hydraulic ascension, and contrast the measuredvalues and calculated values of nodule slurry friction loss. The experiment measures thesliding speed of nodule particles, and derives the on-site concentration formula in pipeinner.As hydraulic lifting pipe is inevitably in complex states of vertical ascension andsettlement, and lateral wobble, the movement of solid-liquid two-phase flow in the pipe changes. In the experiment, we analyze the relationships between the coefficients ofhydraulic lifting pipe system, and further optimize lift parameters of the hydraulic pipelinesystem.