立管内水合物浆液流动特性及正交实验研究

摘要

The flow characteristics of CO2and natural gas h ydrate slurry in a vertical tube were simulated by FLUENT simulation technique,and the effects of average flow velocity of hydrate slurry,hydrate volume fraction,hydrate particle size and continuous phase viscosity on concentration distribution and velocity distribution of the hydrate at the outlet cross-section of the vertical tube and pressure drop of the vertical tube section were investigated. In addition,the order of influencing factors for drag characteristics of CO2hydrate and natural gas hydrate in the vertical tube was determined by orthogonal experiments as continuous phase viscosity ＞ volume fraction of hydrate particles ＞ diameter of hydrate particles ＞ average flow velocity of the hydrate slurry,and on this basis,the optimal combination of various influencing factors was determined,i.e.,average velocity 2.5 m/s,hydrate volume fraction 10%,continuous phase viscosity 1.79 mPa·s,and hydrate particle diameter 50 μm. The research results can provide technical support for the development of deep water flow safety technology.%通过FLUENT数值模拟技术对CO2及天然气水合物浆液在立管内的流动特性进行了模拟,研究了水合物浆液平均流速、水合物体积分数、水合物颗粒粒径及连续相黏度对立管出口截面水合物浓度分布、速度分布及立管段压降的影响.通过正交实验确定了立管中CO2水合物和天然气水合物阻力特性各影响因素的顺序均为:连续相黏度＞水合物颗粒的体积分数＞水合物颗粒的直径＞水合物浆液的平均流速,并在此基础上确定了各影响因素的最优组合,即平均流速2.5 m/s、水合物体积分数10%、连续相黏度1.79 mPa·s、水合物颗粒直径50 μm.研究结果可为深水流动安全保障技术的发展提供技术支持.