【摘要】：成品油順序輸送可以提高管道輸送效率,有利于建設(shè)成本和運(yùn)輸成本的節(jié)約,并且有利于生態(tài)環(huán)境保護(hù),目前成品油輸送主要采用管道順序輸送的方式。然而由于同時(shí)輸送不同種油品,在相鄰兩種油品接觸界面處會(huì)產(chǎn)生混油。混油規(guī)律受油品物理性質(zhì)、運(yùn)行工況等種種因素的影響,這使得精確地進(jìn)行混油控制和處理存在很大的難度。因此研究順序輸送過程中混油的分布規(guī)律對(duì)順序輸送工藝設(shè)計(jì)及混油后處理具有非常重要的意義。本文以計(jì)算流體力學(xué)及混油理論為依據(jù),運(yùn)用計(jì)算流體軟件FLUENT,基于多相流VOF模型,以柴油和汽油順序輸送為例進(jìn)行了模擬分析。對(duì)水平直管路考慮重力影響與不考慮重力影響的混油進(jìn)行數(shù)值模擬,利用Tecplot、Excel等軟件對(duì)模擬得到的數(shù)據(jù)進(jìn)行處理,將順序輸送過程中混油的分布情況以圖表的形式予以展現(xiàn),分析了混油形成的規(guī)律及機(jī)理。結(jié)果表明重力對(duì)混油形態(tài)影響較大,考慮重力的影響是十分必要的。并對(duì)重力影響下的水平直管路,在不同輸送次序下的混油進(jìn)行模擬,分析了輸送順序?qū)煊鸵?guī)律的影響。對(duì)油品流經(jīng)水平直管管路、同心異徑管路及偏心異徑管路的混油進(jìn)行了數(shù)值模擬。分析了不同輸送次序下,三種管路混油形態(tài)形成的原因。結(jié)果表明管道漸縮時(shí),在汽油前行及柴油前行兩種輸送次序下,采用同心異徑管路混油比偏心異徑管路穩(wěn)定,混油長度較短,有利于混油控制及后處理。管道漸擴(kuò)時(shí),在汽油前行及柴油前行兩種輸送次序下,偏心異徑管路混油段長度明顯小于同心異徑管路混油段長度。對(duì)流經(jīng)3倍曲率半徑與1.5倍曲率半徑的90度豎直彎管的混油過程進(jìn)行數(shù)值模擬。結(jié)果表明在兩種輸送次序下,采用3倍曲率半徑的彎管比1.5倍曲率半徑的彎管混油形態(tài)穩(wěn)定,混油段長度較短,有利于減少混油損失。本文考慮重力場的影響更接近實(shí)際情況,研究的內(nèi)容與工程實(shí)際緊密結(jié)合。管道輸量變化時(shí)選用同心異徑還是偏心異徑,高程變化時(shí)選用曲率半徑大的彎管還是曲率半徑小的彎管均為順序輸送管道工藝設(shè)計(jì)中面臨的問題,因此研究結(jié)果可以為成品油管道工藝設(shè)計(jì)提供一定依據(jù)。同時(shí)混油規(guī)律的研究可以為混油追蹤與混油切割提供一定的參考。
[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.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE832

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