Abstract: To study the impact of reducer pipeline on batch transportation of mixed product oil when there was a large drop at a crossing point, CFD multiphase flow model was used and transportation control equation was established based on petroldiesel oil mixture. Simulation about mixed volume of reducer pipeline placed in front of or behind the elbow was calculated and presented with pictures. The analysis show that when reducer pipeline placed in front of the elbow, the length of mixed oil was fairly equal and more diesel oil would mix into petrol under the petrol first order. While reducer pipeline placed behind the elbow, the length of mixed oil was longer and the average volume fractions of crossing sections along every axial were unevenly distributed under the petrol first order. Therefore for the reducing of mixed volume, it was appropriate for placing reducer pipeline in front of the elbow and taking the diesel oil first order when batch transportation pipeline was passing through the crossing point.

Key words: Batch transportation , Crossing point ,  Reducer pipe , Numerical simulation ,  Mixedoil

摘要： 针对成品油管道沿线落差较大且出现翻越点时,管路变径对成品油顺序输送混油比例产生影响的问
题,应用CFD软件多相流模型,以汽油和柴油作为交替输送对象,建立顺序输送混油控制方程,分别对变径位置在弯
管前和弯管后两种情况进行数值计算,得到了混油量分布云图,分析了不同输送顺序对混油体积分数的影响。结果
表明,弯管前变径时,后行柴油和后行汽油的混油段长度大致相等,后行柴油楔入到前行汽油中的量较多;弯管后变
径时,后行柴油的混油段较长,沿轴向各截面的平均体积分数不均匀。因此,成品油管道通过翻越点时,选取变径位
置在弯管前,并多采用前行柴油后行汽油的输送方式有助于减少混油量。

关键词: 顺序输送 , 翻越点 , 变径管 , 数值模拟 , 混油