海底原油管道停输温降的Fluent模拟

Numerical Simulation of the Temperature Drop in Submarine Oil Pipeline during Shutdown Based on Fluent

利用 Fluent流体分析软件模拟海底管道停输温降过程，分析不同初始油温、不同环境温度下的温降过程，得出了与实际吻合较好的温降曲线。计算结果表明，管道停输0~20 h温降速度很快，主要是因为该阶段管内原油的自然对流较强烈。停输20 h后的一段时间内温降缓慢，降温在5℃以内，这是因为管内原油接近临界温度，原油黏度增大及蜡晶析出，使得自然对流强度减弱。初始油温和海水温度对停输温降影响非常明显。

The temperature drop in submarine oil pipeline during shutdown was simulated using Fluent software.The results show that the temperature drop is very quickly after the pipeline shutdown 0~20 h,mainly because the nature convection in the pipeline of the crude oil is relatively strong;the temperature drop becomes slowly after shutdown for 20 hours,which is less than 5 ℃,that’s because the temperature of the crude oil is close to the critical temperature,the viscosity of the crude oil increases and the wax crystal separates out,which reduces the intensity of natural convection.The initial temperature in oil pipeline and sea temperature have great effect on the temperature drop.