柴推汽顺序输送混油尾段特性研究

发布时间：2018-03-31 13:45

本文选题：顺序输送　切入点：混油模拟　出处：《西南石油大学》2017年硕士论文

【摘要】：成品油顺序输送不可避免的在接触界面产生混油。由于混油拖尾现象的出现,在切割完成后,后行油品的质量在很长一段时间依然不合格,销售公司只能将其切入单独的混油罐,待质量指标达到相关要求后再将其切入纯净油罐。目前对混油尾段油品体积分布规律研究仍不完善,因此本论文主要研究内容为混油尾段油品体积分布规律以及切割后不合格油品的处理方式。首先从理论上分析了常见混油因素对成品油顺序输送混油的影响,例如停输、输送次序、输量、初始混油、输送距离、支线作业等影响因素。其次,采用数值模拟的方法,着重研究盲支管存在时对混油尾段的影响;接着通过改变模拟条件,分析了油品流速和盲支管长度对混油尾段的影响;最后模拟盲支管不同形状的组合,得到了某一具体长度下盲支管,油品置换时间最短的组合,并且提出一些缩短盲支管长度的新型工艺。然后,通过室内实验得到某些特定闪点柴油掺混不同比例汽油后其闪点值。再通过线性回归及牛顿插值的方法得到常见闪点范围内柴油掺混汽油后,其闪点计算模型。而后,展开具体管道的混油尾段柴汽体积分布规律现场室验,将室内实验柴油闪点计算模型和现场混油尾段切割后检测到的后行油品闪点变化规律相结合,得到国内某两条成品油管道切割完成后,混油尾段汽油体积分布规律曲线。最后,依据室内实验数据以及现场实验获得的混油尾段汽油体积分布规律曲线,编制了顺序输送混油尾段不合格油品量计算软件。用于计算按照某一固定比例切割完成后,尾段不合格油品量,软件计算不合格油品量与B管道7月24日现场监测的不合格油品量值相比,相差8%,软件精确度较高。除此之外,该软件还可计算将不合格油品切入到某一油罐后罐内整个油品的闪点变化规律。
[Abstract]:It is inevitable that the sequential transportation of finished oil will produce mixed oil at the contact interface. Due to the appearance of oil blending tail phenomenon, after cutting, the quality of oil product after cutting is still not up to standard for a long time. The sales company can only cut it into a separate mixing tank, and then cut it into a pure oil tank after the quality index has reached the relevant requirements. At present, the study on the volume distribution law of the oil products in the tail section of the mixed oil is still not perfect. Therefore, the main contents of this paper are the volume distribution of oil products in the tail section of mixed oil and the treatment methods of unqualified oil products after cutting. Firstly, the influence of common mixed oil factors on the sequential transportation of mixed oil products is analyzed theoretically, such as stopping transportation. The influence factors such as transportation order, transportation quantity, initial oil mixing, transportation distance, branch line operation and so on. Secondly, the influence of blind branch pipe on the tail section of mixed oil is studied by numerical simulation method, and then the simulation conditions are changed by changing the simulation conditions. The effects of flow rate of oil products and the length of blind branch tube on the tail section of mixed oil are analyzed. Finally, the combination of different shapes of blind branch pipe is simulated, and the combination of blind branch pipe with the shortest replacement time is obtained under a specific length. And put forward some new technology to shorten the length of blind branch pipe. Through laboratory experiments, the flash point values of diesel blended with different proportion of gasoline at certain flash point were obtained, and then the calculation model of flash point was obtained by linear regression and Newton interpolation method. In this paper, the steam volume distribution law of mixed oil tailings is carried out in the laboratory, and the model of diesel flash point calculation in laboratory is combined with the change law of flash point of oil products detected after cutting the tail section of mixed oil in the field. The volume distribution curve of gasoline in the tail section of mixed oil was obtained after the cutting of two domestic finished oil pipelines. Finally, the volume distribution curve of gasoline in the tail section of mixed oil was obtained according to the indoor experimental data and the field experiment. A software for calculating the unqualified oil quantity in the tailings of sequential transportation is developed, which is used to calculate the unqualified oil quantity of the tail section after the completion of cutting according to a fixed proportion. The amount of unqualified oil products calculated by the software is 8 points different from that of the non-qualified oil products monitored on the spot of B pipeline on July 24. Besides, the accuracy of the software is relatively high. The software can also calculate the flash point variation rule of the whole oil product after cutting the unqualified oil product into a certain tank.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE83

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