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针对管道沿线落差较大或变径时,水力瞬变对冷热原油顺序输送混油比例存在影响的问题,基于顺序输送混油理论,建立了冷热原油顺序输送混油控制方程。借助FLUENT软件对冷热原油途经变径管道水力瞬变过程进行数值计算,分析了输送顺序和流速对混油浓度的影响。研究表明:当冷热原油顺序流经渐缩管道时,混油长度增长较快,当冷热原油流经突扩管道时,混油长度增长速率降低。无论渐缩管道还是突扩管道,与前行俄罗斯油后行大庆油的输送方式相比,采用前行大庆油后行俄罗斯油的输送方式形成的混油段都较长,且突扩管段连接处和上游轴向各截面的平均混油比例波动较大。
Aiming at the problem that the hydraulic transients affect the proportion of hot and cold crude oil in sequence when there is a large or decreasing diameter difference along the pipeline, the control equation for the sequential delivery of mixed crude oil is established based on the theory of sequential delivery of mixed oil. With FLUENT software, the transient process of hot and cold crude oil passing through the reduction pipe was numerically calculated, and the influence of conveying sequence and flow rate on the mixed oil concentration was analyzed. The results show that when the hot and cold crude oil flows through the tapered pipe in sequence, the length of the mixed oil increases rapidly. When the hot and cold crude oil flows through the expansion pipe, the growth rate of the mixed oil decreases. No matter the tapered pipe or the spreader pipe, compared with the previous Russian oil Daqin oil delivery line, compared with the former line of Daqing oil Russia oil after the formation of the delivery of oil are longer, and expansion pipe segment connection Department and the upstream axial cross-section of the average proportion of oil fluctuations.