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针对深海天然气水合物海开采系统的管道水力提升过程中,因水合物在压力降低的情况下部分气化而产生气体,使得矿浆垂直运输从传统两相流变成了三相流的问题,建立了沿管道方向压力和分解量与海洋深度的函数关系,求出了分解临界面的深度,以及与气体体积和密度等相关的参数;分析了管径、颗粒粒径、浆体流速、输送体积浓度和矿物密度5个参数对分解临界面和产生气体质量的影响,从而总结出沿管道的水力损失越小,临界分解面越深,分解出来的气体越多的规律,并选取了管径为300mm,颗粒粒径为10mm、浆体流速为1.65m/s、输送体积浓度为30%和矿物密度为1190kg/m3的最佳运输条件。
In the process of pipeline hydraulic lift in the deep sea gas hydrate sea mining system, gas is generated due to partial gasification of the hydrate under a reduced pressure so that the vertical transport of slurry changes from a traditional two-phase flow to a three-phase flow, The relationship between pressure and decomposition along the pipeline as a function of ocean depth was obtained, and the depth of the decomposition interface and the parameters related to the gas volume and density were obtained. The influences of the diameter, particle size, slurry velocity, Concentration and mineral density of five parameters on the decomposition of the critical surface and the impact of gas quality, and thus summed up along the pipeline, the smaller the hydraulic loss, the deeper the critical decomposition surface, the decomposition of the gas more rules, and select the diameter 300mm, particle size of 10mm, slurry flow rate of 1.65m / s, transport volume concentration of 30% and mineral density of 1190kg / m3 of the best transport conditions.