本文關(guān)鍵詞：濕天然氣管道低含液率氣液兩相流液滴夾帶機理研究　出處：《西安石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 濕天然氣管道 低含液量 氣液兩相流 夾帶機理 夾帶率

【摘要】：在氣液兩相流動中,夾帶率是一個非常重要的參數(shù),對于管線、井筒和分離器設(shè)計等方面都有著很大的影響。當(dāng)管道內(nèi)氣相速度足夠高時,由于高氣相速度的剪切作用,使得管道內(nèi)氣液界面易發(fā)生液滴夾帶現(xiàn)象。被夾帶液滴的速度一般接近于管線中氣體的流動速度,這個速度遠遠高于低含量液體部分在管道底層的速度。液滴被夾帶進入氣相之后也改變了氣相的密度,即使被夾帶液滴的量是微小的,它對于管線壓降和持液率的影響仍然很大,所以對于低含液量氣液兩相流工況液滴夾帶機理的研究是非常重要的。通過對夾帶率計算模型的改進,可以更加完善持液率和壓降的預(yù)測模型,應(yīng)用于實際工程中能夠進一步提高管道運輸效率。本文研究了濕天然氣管道內(nèi)低含液量氣液兩相流液滴夾帶的形成機理,對現(xiàn)有的夾帶率計算模型進行了綜合分析�；赩B6.0平臺將各模型的計算過程編制了模型求解程序,計算得到夾帶率的值,并采用收集到的實驗數(shù)據(jù)對各個模型作了驗證和對比分析,給出了不同氣液表觀速度下的夾帶率計算模型推薦使用情況,同時確定了一種最適用于低含液量氣液兩相流工況的夾帶率計算模型—Zhang[27](2003)等人對Oliemans(1986)等的修正模型。之后對該模型進行了改進,用平均混合密度替換了氣相密度參數(shù),構(gòu)建了一個計算夾帶率的改進關(guān)系式。此外,基于實驗數(shù)據(jù)對各夾帶率計算模型進行了評價,通過將各模型的計算值與實驗數(shù)據(jù)進行對比分析發(fā)現(xiàn)本文改進模型的計算精度更高,誤差更小。最后,分析了氣、液相粘度,管徑和界面張力等參數(shù)對夾帶率的影響。
[Abstract]:In gas-liquid two-phase flow, entrainment rate is a very important parameter, which has great influence on the design of pipeline, wellbore and separator. Due to the shear effect of high gas velocity, the phenomenon of droplet entrainment is easy to occur in the gas-liquid interface of the pipeline, and the velocity of the entrained droplet is generally close to that of the gas flowing in the pipeline. This velocity is much higher than the velocity of the lower liquid part at the bottom of the pipe. The droplet is entrained into the gas phase and changes the density of the gas phase, even if the amount of the droplet is small. It still has a great influence on the pressure drop and liquid holdup of pipeline, so it is very important to study the mechanism of droplet entrainment under the condition of gas-liquid two-phase flow with low liquid content. The prediction model of liquid holdup and pressure drop can be improved. In this paper, the formation mechanism of droplet entrainment of gas-liquid two-phase flow with low liquid content in wet natural gas pipeline is studied. The existing calculation model of entrainment rate is comprehensively analyzed. Based on the VB6.0 platform, the calculation process of each model is programmed to solve the model, and the value of the rate of entrainment is calculated. The experimental data collected are used to verify and compare the models, and the recommended usage of the models for calculating the entrainment rate under different apparent gas-liquid velocities is given. At the same time, a calculation model of entrainment rate for gas-liquid two-phase flow with low liquid content is established. [The modified model of Oliemans et al. 1986.After this model is improved, the gas phase density parameter is replaced by the average mixing density. An improved formula for calculating the entrainment rate is constructed. In addition, each model is evaluated based on the experimental data. By comparing the calculated values of each model with the experimental data, it is found that the improved model has higher accuracy and smaller error. Finally, the viscosity of gas and liquid phase is analyzed. The influence of pipe diameter and interfacial tension on the entrainment rate.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE832

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本文編號：1407602