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为研究CCl3F(R11)水合物浆在水平管内的流动特性,建立了CFD/FLUENT数值模型。对比模拟得到的压降与实验压降可见,相对误差均在20%以内,表明该模型具有较高的准确性。通过模拟分析管内水合物颗粒流动特性发现,控制流速可以有效防止水合物阻塞。同时,深入模拟研究了CCl3F(R11)水合物颗粒在管内流动的沉积特性,结果表明:流速对CCl3F(R11)水合物的沉积特性影响较大,当平均流速达到一定值时,水合物颗粒体积分数对其沉积特性影响不大,将该流速视为管道安全运行的最小流速。通过分析水合物浆的其他关键参数如颗粒密度、颗粒粒径、管径对管道安全运行最小流速的影响,得出水合物颗粒粒径对管道安全运行最小流速的影响较大,水合物颗粒密度及管径对管道安全运行最小流速的影响较小。因此,水合物浆最小安全运行流速为0.5~1m/s。
In order to study the flow characteristics of CCl3F (R11) hydrate slurry in a horizontal tube, a CFD / FLUENT numerical model was established. The pressure drop and experimental pressure drop obtained by comparison simulation can be seen, the relative errors are within 20%, indicating that the model has high accuracy. Through the simulation analysis of the flow characteristics of the hydrate particles in the pipe, it was found that controlling the flow rate can effectively prevent the hydrate from clogging. At the same time, the deposition characteristics of CCl3F (R11) hydrate particles flowing in the tube were studied in depth. The results showed that the flow rate had a great influence on the deposition characteristics of CCl3F (R11) hydrate. When the average flow velocity reached a certain value, The fraction has little effect on its deposition characteristics and is considered as the minimum flow rate for safe pipe operation. By analyzing the influence of other key parameters of hydrate slurry such as particle density, particle size and diameter on the minimum flow velocity of pipeline, it is concluded that the influence of hydrate particle size on the minimum flow velocity of pipeline is great. The hydrate particle density And pipe diameter of the safe operation of the pipeline minimum flow rate of less impact. Therefore, the minimum safe flow rate of hydrate slurry 0.5 ~ 1m / s.