導(dǎo)向型塔板流動機理與CFD模擬研究
發(fā)布時間：2018-08-25 08:07
【摘要】：本文綜述介紹了不同結(jié)構(gòu)導(dǎo)向型塔板的發(fā)展現(xiàn)狀及塔板CFD模擬的發(fā)展應(yīng)用情況。首次建立了導(dǎo)向篩板的全工況多尺度CFD模型,并通過塔板流體力學(xué)實驗驗證確定了模型的準(zhǔn)確和可靠性。采用歐拉-歐拉多相流模型、重整化群k-ε湍流模型,分析塔板上氣液間相互作用力在塔板不同區(qū)域的作用形式確定其動量源項,設(shè)置合理邊界條件,建立了導(dǎo)向篩板三維兩相流CFD模型。該模型可以模擬獲得包括塔板壓降、漏液、霧沫夾帶、清液層高度等宏觀流體力學(xué)數(shù),也可以利用模擬數(shù)據(jù)經(jīng)計算處理后獲得塔板上導(dǎo)向孔的動量傳遞系數(shù)、塔板阻力系數(shù)等微觀參數(shù)。為了驗證CFD模型的準(zhǔn)確與可靠性,在內(nèi)徑Φ476mm,板間距450mm的冷模有機玻璃塔內(nèi),以空氣-水物系測量了相同結(jié)構(gòu)尺寸導(dǎo)向篩板的塔板壓降、漏液夾帶、清液層高度等宏觀流體力學(xué)數(shù)據(jù)。利用ANSYS Fluent 15.0軟件通過合理設(shè)置初始化參數(shù)模擬導(dǎo)向篩板模型獲得流體力學(xué)參數(shù)模擬值,模擬得到的流體力學(xué)數(shù)據(jù)和實驗數(shù)據(jù)吻合的很好。干板壓降的模擬值與實驗值誤差在5%以內(nèi),濕板壓降誤差在10%以內(nèi)。清液層高度誤差在10%以內(nèi),誤差小精度高。CFD模擬結(jié)果確定了導(dǎo)向孔定向推液作用,發(fā)現(xiàn)和驗證了漏液的主要產(chǎn)生區(qū)域并給出了改進(jìn)意見。在此基礎(chǔ)上,通過在塔板上設(shè)置監(jiān)控面輸出需要參數(shù)數(shù)據(jù),對塔板上液相進(jìn)行動量衡算,經(jīng)計算處理后分別得到了鼓泡促進(jìn)器動量傳遞系數(shù)、導(dǎo)向孔動量傳遞系數(shù)、塔板與液相間阻力系數(shù)等微觀參數(shù)。這些微觀參數(shù)與天津大學(xué)通過實驗測定的參數(shù)吻合的很好,證明了模型的準(zhǔn)確和可靠性,完全可以代替實驗研究來指導(dǎo)改進(jìn)結(jié)構(gòu)優(yōu)化流場。最后我們給出了利用模擬數(shù)據(jù)計算塔板上液相平均停留時間的公式,指導(dǎo)模型的工業(yè)應(yīng)用。本文通過理論研究建立了導(dǎo)向篩板CFD模型,通過流體力學(xué)實驗驗證了模型的準(zhǔn)確與可靠性,為導(dǎo)向篩板的流場模擬提供了有效方法,為導(dǎo)向篩板的結(jié)構(gòu)優(yōu)化和工業(yè)生產(chǎn)提供理論指導(dǎo)。
[Abstract]:In this paper, the development and application of CFD simulation of trays with different structures are reviewed. The multi-scale CFD model of the guide sieve plate is established for the first time, and the accuracy and reliability of the model are confirmed by the hydrodynamic experiments of the tray. Using the Euler-Euler multiphase flow model and the k- 蔚 turbulence model of renormalization group, the momentum source term of the gas-liquid interaction on the tray in different regions is analyzed, and the reasonable boundary conditions are set up. The CFD model of three-dimensional two-phase flow on the guide sieve plate is established. The model can be used to obtain macroscopic hydrodynamic numbers including tray pressure drop, leakage, entrainment of aerosol, height of clear liquid layer, etc. The momentum transfer coefficient of guide hole on tray can also be obtained by using simulated data. Trays resistance coefficient and other microscopic parameters. In order to verify the accuracy and reliability of the CFD model, the pressure drop and leakage entrainment of the guide sieve plate of the same structure were measured with air-water system in the cold mould plexiglass tower with diameter 桅 476 mm and plate spacing 450mm. Macroscopical hydrodynamic data such as liquid-layer height. By using ANSYS Fluent 15.0 software, the simulation values of hydrodynamic parameters are obtained by reasonably setting initialization parameters to simulate the guided sieve plate model. The results obtained from the simulation are in good agreement with the experimental data. The error between the simulated and experimental values of dry plate pressure drop is less than 5%, and that of wet plate pressure drop is less than 10%. The error of liquid-layer height is less than 10%, and the error is small. The result of CFD simulation determines the directional pushing effect of the guide hole, finds and verifies the main producing area of the leakage, and gives some suggestions for improvement. On the basis of this, the momentum balance of liquid phase on the tray is calculated by setting the monitoring surface output parameter data on the tray. The momentum transfer coefficient of bubble promoter and the momentum transfer coefficient of guide hole are obtained respectively after calculation and treatment. Micro parameters such as resistance coefficient between tray and liquid phase. These microscopic parameters are in good agreement with those measured by Tianjin University, which proves the accuracy and reliability of the model and can replace the experimental study to guide the optimization of the flow field of the structure. Finally, we give a formula for calculating the average residence time of liquid phase on the trays using the simulated data, which can guide the industrial application of the model. In this paper, the CFD model of guided sieve plate is established by theoretical research. The model is proved to be accurate and reliable by hydrodynamic experiments, which provides an effective method for the flow field simulation of guided sieve plate. It provides theoretical guidance for structural optimization and industrial production of the guide sieve plate.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ053.5
本文編號：2202283
[Abstract]:In this paper, the development and application of CFD simulation of trays with different structures are reviewed. The multi-scale CFD model of the guide sieve plate is established for the first time, and the accuracy and reliability of the model are confirmed by the hydrodynamic experiments of the tray. Using the Euler-Euler multiphase flow model and the k- 蔚 turbulence model of renormalization group, the momentum source term of the gas-liquid interaction on the tray in different regions is analyzed, and the reasonable boundary conditions are set up. The CFD model of three-dimensional two-phase flow on the guide sieve plate is established. The model can be used to obtain macroscopic hydrodynamic numbers including tray pressure drop, leakage, entrainment of aerosol, height of clear liquid layer, etc. The momentum transfer coefficient of guide hole on tray can also be obtained by using simulated data. Trays resistance coefficient and other microscopic parameters. In order to verify the accuracy and reliability of the CFD model, the pressure drop and leakage entrainment of the guide sieve plate of the same structure were measured with air-water system in the cold mould plexiglass tower with diameter 桅 476 mm and plate spacing 450mm. Macroscopical hydrodynamic data such as liquid-layer height. By using ANSYS Fluent 15.0 software, the simulation values of hydrodynamic parameters are obtained by reasonably setting initialization parameters to simulate the guided sieve plate model. The results obtained from the simulation are in good agreement with the experimental data. The error between the simulated and experimental values of dry plate pressure drop is less than 5%, and that of wet plate pressure drop is less than 10%. The error of liquid-layer height is less than 10%, and the error is small. The result of CFD simulation determines the directional pushing effect of the guide hole, finds and verifies the main producing area of the leakage, and gives some suggestions for improvement. On the basis of this, the momentum balance of liquid phase on the tray is calculated by setting the monitoring surface output parameter data on the tray. The momentum transfer coefficient of bubble promoter and the momentum transfer coefficient of guide hole are obtained respectively after calculation and treatment. Micro parameters such as resistance coefficient between tray and liquid phase. These microscopic parameters are in good agreement with those measured by Tianjin University, which proves the accuracy and reliability of the model and can replace the experimental study to guide the optimization of the flow field of the structure. Finally, we give a formula for calculating the average residence time of liquid phase on the trays using the simulated data, which can guide the industrial application of the model. In this paper, the CFD model of guided sieve plate is established by theoretical research. The model is proved to be accurate and reliable by hydrodynamic experiments, which provides an effective method for the flow field simulation of guided sieve plate. It provides theoretical guidance for structural optimization and industrial production of the guide sieve plate.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ053.5
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