海底水合物混合浆体除泥砂水力旋流器

根据海底天然气水合物基本特征和多相流理论,完成了水力旋流器结构参数初步设计,并对原汉考克综合效率计算公式中各参数的含义进行了修正,得到了符合海底水合物混合浆体的改进汉考克综合效率计算公式.然后,建立了水力旋流器的有限元模型,基于雷诺应力模型开发了一种适合液-固-固三相流的流场模拟分析方法,通过数值模拟分析,得到了水力旋流器内部的速度、压力和密度等参数的分布规律.最后,通过结构参数的正交试验优化,得到了水力旋流器的最优结构参数组合,使其分离效率提升到初始方案分离效率的1.36倍.进一步对操作参数进行了正交试验优化,得到了水力旋流器的最优操作参数组合,使水力旋流器的分离效率又提高了5.15%.

Hydrocyclone for Separating Silt in Gas Hydrate Mixed Slurry on the Seabed

According to the basic features of seabed gas hydrate and the multiphase flow theory, by comparing separation schemes, this paper accomplished the preliminary design of the structural parameters for the hydrocyclone. As the original Hancock overall efficiency formula could not be directly used in the calculation of the separation efficiency of seabed gas hydrate mixed slurry, the definition of parameters of the original formula was modified to work out an improved formula. Then, the finite element model for the hydrocyclone was established and developed, based on the Reynolds stress model, a flow field simulation analysis method applicable for the liquid-solid-solid tri-phase flow, and by simulation analysis of the numerical value, distribution rules of parameters of the hydrocyclone such as the internal speed, pressure and density are obtained. Finally, the optimal structural parameter combination for the hydrocyclone was worked out by optimizing the structural parameters through orthogonal test, thus increasing the separation efficiency by 36. 24%, compared with the initial scheme. Then, the operational parameters were further optimized through orthogonal test to gain an optimal operational parameter combination for the hydrocyclone, increasing separation efficiency of the hydrocyclone by another 5. 15%.