本文選題：順序輸送　切入點：混油模擬　出處：《西南石油大學(xué)》2017年碩士論文

【摘要】：成品油順序輸送不可避免的在接觸界面產(chǎn)生混油。由于混油拖尾現(xiàn)象的出現(xiàn),在切割完成后,后行油品的質(zhì)量在很長一段時間依然不合格,銷售公司只能將其切入單獨的混油罐,待質(zhì)量指標(biāo)達(dá)到相關(guān)要求后再將其切入純凈油罐。目前對混油尾段油品體積分布規(guī)律研究仍不完善,因此本論文主要研究內(nèi)容為混油尾段油品體積分布規(guī)律以及切割后不合格油品的處理方式。首先從理論上分析了常見混油因素對成品油順序輸送混油的影響,例如停輸、輸送次序、輸量、初始混油、輸送距離、支線作業(yè)等影響因素。其次,采用數(shù)值模擬的方法,著重研究盲支管存在時對混油尾段的影響;接著通過改變模擬條件,分析了油品流速和盲支管長度對混油尾段的影響;最后模擬盲支管不同形狀的組合,得到了某一具體長度下盲支管,油品置換時間最短的組合,并且提出一些縮短盲支管長度的新型工藝。然后,通過室內(nèi)實驗得到某些特定閃點柴油摻混不同比例汽油后其閃點值。再通過線性回歸及牛頓插值的方法得到常見閃點范圍內(nèi)柴油摻混汽油后,其閃點計算模型。而后,展開具體管道的混油尾段柴汽體積分布規(guī)律現(xiàn)場室驗,將室內(nèi)實驗柴油閃點計算模型和現(xiàn)場混油尾段切割后檢測到的后行油品閃點變化規(guī)律相結(jié)合,得到國內(nèi)某兩條成品油管道切割完成后,混油尾段汽油體積分布規(guī)律曲線。最后,依據(jù)室內(nèi)實驗數(shù)據(jù)以及現(xiàn)場實驗獲得的混油尾段汽油體積分布規(guī)律曲線,編制了順序輸送混油尾段不合格油品量計算軟件。用于計算按照某一固定比例切割完成后,尾段不合格油品量,軟件計算不合格油品量與B管道7月24日現(xiàn)場監(jiān)測的不合格油品量值相比,相差8%,軟件精確度較高。除此之外,該軟件還可計算將不合格油品切入到某一油罐后罐內(nèi)整個油品的閃點變化規(guī)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.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE83

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