顺序输送中混油的数值模拟与分析
发布时间：2018-12-14 21:33
【摘要】：成品油顺序输送可以提高管道输送效率,有利于建设成本和运输成本的节约,并且有利于生态环境保护,目前成品油输送主要采用管道顺序输送的方式。然而由于同时输送不同种油品,在相邻两种油品接触界面处会产生混油。混油规律受油品物理性质、运行工况等种种因素的影响,这使得精确地进行混油控制和处理存在很大的难度。因此研究顺序输送过程中混油的分布规律对顺序输送工艺设计及混油后处理具有非常重要的意义。本文以计算流体力学及混油理论为依据,运用计算流体软件FLUENT,基于多相流VOF模型,以柴油和汽油顺序输送为例进行了模拟分析。对水平直管路考虑重力影响与不考虑重力影响的混油进行数值模拟,利用Tecplot、Excel等软件对模拟得到的数据进行处理,将顺序输送过程中混油的分布情况以图表的形式予以展现,分析了混油形成的规律及机理。结果表明重力对混油形态影响较大,考虑重力的影响是十分必要的。并对重力影响下的水平直管路,在不同输送次序下的混油进行模拟,分析了输送顺序对混油规律的影响。对油品流经水平直管管路、同心异径管路及偏心异径管路的混油进行了数值模拟。分析了不同输送次序下,三种管路混油形态形成的原因。结果表明管道渐缩时,在汽油前行及柴油前行两种输送次序下,采用同心异径管路混油比偏心异径管路稳定,混油长度较短,有利于混油控制及后处理。管道渐扩时,在汽油前行及柴油前行两种输送次序下,偏心异径管路混油段长度明显小于同心异径管路混油段长度。对流经3倍曲率半径与1.5倍曲率半径的90度竖直弯管的混油过程进行数值模拟。结果表明在两种输送次序下,采用3倍曲率半径的弯管比1.5倍曲率半径的弯管混油形态稳定,混油段长度较短,有利于减少混油损失。本文考虑重力场的影响更接近实际情况,研究的内容与工程实际紧密结合。管道输量变化时选用同心异径还是偏心异径,高程变化时选用曲率半径大的弯管还是曲率半径小的弯管均为顺序输送管道工艺设计中面临的问题,因此研究结果可以为成品油管道工艺设计提供一定依据。同时混油规律的研究可以为混油追踪与混油切割提供一定的参考。
[Abstract]:The sequential transportation of refined oil can improve the efficiency of pipeline transportation, save the cost of construction and transportation, and also benefit the protection of ecological environment. At present, pipeline sequential transportation is mainly used for the transportation of refined oil products. However, because different oil products are transported simultaneously, mixed oil will be produced at the interface between the two adjacent oil products. The law of oil mixing is affected by the physical properties of oil products and operation conditions, which makes it difficult to control and treat the oil mixture accurately. Therefore, it is very important to study the distribution of mixed oil in sequential transportation process for the design of sequential transportation process and the post-treatment of mixed oil. Based on the theory of computational fluid dynamics and oil mixing, this paper uses the computational fluid software FLUENT, based on multiphase flow VOF model, taking the sequential transportation of diesel oil and gasoline as an example. The mixed oil with or without gravity effect in horizontal pipeline is numerically simulated. The simulation data are processed by Tecplot,Excel and the distribution of mixed oil in sequential transportation process is shown in the form of chart. The formation law and mechanism of mixed oil were analyzed. The results show that gravity has a great influence on the morphology of mixed oil, and it is necessary to consider the influence of gravity. The influence of transportation sequence on the mixing law was analyzed by simulating the mixed oil in different transportation order of the horizontal straight pipeline under the influence of gravity. The mixed oil flow through horizontal straight pipe, concentric diameters and eccentric diameters is numerically simulated. The causes of the formation of three kinds of pipeline oil mixture in different transport order are analyzed. The results show that when the pipeline gradually shrinks, the concentric diameters pipeline is more stable and the length of the oil mixture is shorter than that of the eccentric diameters pipeline, which is beneficial to the control and post-treatment of the oil mixture. When the pipeline is gradually expanding, the length of the oil mixing section of the eccentric diameters pipeline is obviously smaller than that of the concentric diameters pipeline under the two transport sequences of gasoline and diesel. The mixing process of 90 degree vertical bends flowing through 3 times radius of curvature and 1.5 times radius of curvature is numerically simulated. The results show that under the two transport sequences, the oil mixing morphology of the tube with 3 curvature radius is stable than that with 1.5 curvature radius, and the length of the oil mixing section is shorter, which is beneficial to reduce the loss of oil mixture. In this paper, the influence of gravity field is considered to be closer to the actual situation, and the research contents are closely combined with engineering practice. The choice of concentric or eccentric diameters in pipeline volume variation, and the choice of curved pipes with large curvature radius or small curvature radius in height change are all the problems in the process design of sequential transportation pipeline. Therefore, the research results can provide some basis for the process design of refined oil pipeline. At the same time, the study of oil mixing law can provide some reference for oil mixing tracing and cutting.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE832
本文编号：2379358
[Abstract]:The sequential transportation of refined oil can improve the efficiency of pipeline transportation, save the cost of construction and transportation, and also benefit the protection of ecological environment. At present, pipeline sequential transportation is mainly used for the transportation of refined oil products. However, because different oil products are transported simultaneously, mixed oil will be produced at the interface between the two adjacent oil products. The law of oil mixing is affected by the physical properties of oil products and operation conditions, which makes it difficult to control and treat the oil mixture accurately. Therefore, it is very important to study the distribution of mixed oil in sequential transportation process for the design of sequential transportation process and the post-treatment of mixed oil. Based on the theory of computational fluid dynamics and oil mixing, this paper uses the computational fluid software FLUENT, based on multiphase flow VOF model, taking the sequential transportation of diesel oil and gasoline as an example. The mixed oil with or without gravity effect in horizontal pipeline is numerically simulated. The simulation data are processed by Tecplot,Excel and the distribution of mixed oil in sequential transportation process is shown in the form of chart. The formation law and mechanism of mixed oil were analyzed. The results show that gravity has a great influence on the morphology of mixed oil, and it is necessary to consider the influence of gravity. The influence of transportation sequence on the mixing law was analyzed by simulating the mixed oil in different transportation order of the horizontal straight pipeline under the influence of gravity. The mixed oil flow through horizontal straight pipe, concentric diameters and eccentric diameters is numerically simulated. The causes of the formation of three kinds of pipeline oil mixture in different transport order are analyzed. The results show that when the pipeline gradually shrinks, the concentric diameters pipeline is more stable and the length of the oil mixture is shorter than that of the eccentric diameters pipeline, which is beneficial to the control and post-treatment of the oil mixture. When the pipeline is gradually expanding, the length of the oil mixing section of the eccentric diameters pipeline is obviously smaller than that of the concentric diameters pipeline under the two transport sequences of gasoline and diesel. The mixing process of 90 degree vertical bends flowing through 3 times radius of curvature and 1.5 times radius of curvature is numerically simulated. The results show that under the two transport sequences, the oil mixing morphology of the tube with 3 curvature radius is stable than that with 1.5 curvature radius, and the length of the oil mixing section is shorter, which is beneficial to reduce the loss of oil mixture. In this paper, the influence of gravity field is considered to be closer to the actual situation, and the research contents are closely combined with engineering practice. The choice of concentric or eccentric diameters in pipeline volume variation, and the choice of curved pipes with large curvature radius or small curvature radius in height change are all the problems in the process design of sequential transportation pipeline. Therefore, the research results can provide some basis for the process design of refined oil pipeline. At the same time, the study of oil mixing law can provide some reference for oil mixing tracing and cutting.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE832
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