Transportation Of Gas Hydrate In Pipelines And Double Channel To Enhance Pump Flow Field Analysis

Energy has already become the cornerstone of contemporary social development. As the traditional energy exhausting, humans have been forced to find more efficient and cleaner alternative energy. Gas hydrates is the alternative energy and clean energy, being of the most application prospect, human have found.Traditional mining methods are difficult to exploit undersea gas hydrate stored in shallow layer, because those methods can not build a close environment. Under this backgrand, and based on deep-sea mining technology and the cutter suction dredger technology. A new and more feasible solid-state mining program was proposed in this paper. In this program, transporting the hydrate mineral grains to the sea level is the most crucial part. Although there are a large number of research results on the hydraulic transport of solid grains, these results have considerable limitations. So, in order to find better gas hydrate transport parameters and transport equipments, this paper chose to research on hydraulic transport of hydrate.Based on the characteristics of seabed hydrates, this paper proposed a new solid-state mining plan and demonstrated its feasibility. And according to hydraulic transport theory, hydraulic analysises of the transportation system were made, and system parameters expression was given in this paper. Latter, designed five kinds of transportation programs and respectively verified the feasibility of those methods in hydraulic transportation system which works in 1000m and 4000m deep form sea surface. According to the application environment of lift pump, studied on the lift pump. Then, used the mixture module and RNGκ-εturbulence model of Fluent software to simulate the solid-liquid two-phase flow in transportation system. Finally, through experiments, the numerical simulation methods and results were verified. The main research results obtained in this study are as follows:(1)Less than 4,000 meters, using hydraulic transmission technology to transport natural gas hydrate particles to the surface is entirely feasible; In the five working conditions, the highest head of lift pump is 236m.(2)Decreasing density and particle size and increasing its volume fraction are conducive to raising the transmission efficiency of hydrate.(3)Double channel lift pump can adapt to the environment of deep-sea mining, but the overflow area of scroll should be enhanced cause its high intensity transportation working condition.This paper made a foundation for solid-state mining program further study, and provided a theoretical basis to the selection and optimization of deep-sea mining transportation equipment...