含砂热油管道温度与流速双耦合流态冲蚀规律对比分析

Comparative Analysis of Temperature and Velocity Dual-Coupled Flow Pattern Erosion Law in Sandy Hot Oil Pipelines

为研究集输管道中含砂稠油与低黏原油对弯管内壁的冲蚀规律,通过优化的离散相(DPM)冲蚀模型及管道薄壁传热结构,对含砂稠油与低黏原油在温度与流速耦合作用下的流动过程进行模拟。结果表明:在相同流速下,稠油的冲蚀速率随温度变化的规律与其自身雷诺数的变化趋势一致,且冲蚀区域随温度升高会不断扩大;低黏原油的冲蚀速率随温度的变化易受流态影响,其冲蚀速率在过渡区会出现明显的波动过程,但冲蚀区域面积变化不明显。在流速增加的情况下,低黏原油在湍流区的冲蚀速率增长幅度明显大于稠油,且油温越低,低黏原油的冲蚀速率增幅越大。在相同的湍流输送状态下,原油冲蚀速率的变化主要受流速的影响,并且油温的降低对弯管处的减蚀作用有限。

To investigate the erosion patterns of sandy viscous oil and low-viscosity crude oil in gathering and transportation pipeline on the inner walls of bent pipes,an optimized Discrete Phase Model(DPM)erosion model and a pipeline thin-wall heat transfer structure were em-ployed to simulate the flow process of sandy heavy oil and low-viscosity crude oil based on the coupling effect of temperature and flow rate.Results showed that under the same flow velocity,the change of the viscous oil erosion rate with temperature was consistent with the changing trend of its own Reynolds number,and the erosion area would continue to expand as the temperature increases.The erosion rate of low-viscosity crude oil was easily affected by the flow regime with temperature changes,and its erosion rate would fluctuate significantly in the transition zone,but the erosion zone did not change significantly.As flow velocity escalated,the increase in erosion rate of low viscosity crude oil in the turbulent zone was significantly greater than that of heavy oil,and the lower the oil temperature,the greater the increase in the erosion rate of low-viscosity crude oil.Under the same turbulent transportation state,the change of the crude oil erosion rate was mainly affected by the flow rate,and the reduction of oil temperature had a limited effect on corrosion reduction at elbows.