导向型塔板流动机理与CFD模拟研究
发布时间：2018-08-25 08:07
【摘要】：本文综述介绍了不同结构导向型塔板的发展现状及塔板CFD模拟的发展应用情况。首次建立了导向筛板的全工况多尺度CFD模型,并通过塔板流体力学实验验证确定了模型的准确和可靠性。采用欧拉-欧拉多相流模型、重整化群k-ε湍流模型,分析塔板上气液间相互作用力在塔板不同区域的作用形式确定其动量源项,设置合理边界条件,建立了导向筛板三维两相流CFD模型。该模型可以模拟获得包括塔板压降、漏液、雾沫夹带、清液层高度等宏观流体力学数,也可以利用模拟数据经计算处理后获得塔板上导向孔的动量传递系数、塔板阻力系数等微观参数。为了验证CFD模型的准确与可靠性,在内径Φ476mm,板间距450mm的冷模有机玻璃塔内,以空气-水物系测量了相同结构尺寸导向筛板的塔板压降、漏液夹带、清液层高度等宏观流体力学数据。利用ANSYS Fluent 15.0软件通过合理设置初始化参数模拟导向筛板模型获得流体力学参数模拟值,模拟得到的流体力学数据和实验数据吻合的很好。干板压降的模拟值与实验值误差在5%以内,湿板压降误差在10%以内。清液层高度误差在10%以内,误差小精度高。CFD模拟结果确定了导向孔定向推液作用,发现和验证了漏液的主要产生区域并给出了改进意见。在此基础上,通过在塔板上设置监控面输出需要参数数据,对塔板上液相进行动量衡算,经计算处理后分别得到了鼓泡促进器动量传递系数、导向孔动量传递系数、塔板与液相间阻力系数等微观参数。这些微观参数与天津大学通过实验测定的参数吻合的很好,证明了模型的准确和可靠性,完全可以代替实验研究来指导改进结构优化流场。最后我们给出了利用模拟数据计算塔板上液相平均停留时间的公式,指导模型的工业应用。本文通过理论研究建立了导向筛板CFD模型,通过流体力学实验验证了模型的准确与可靠性,为导向筛板的流场模拟提供了有效方法,为导向筛板的结构优化和工业生产提供理论指导。
[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.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ053.5
本文编号：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.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ053.5
【参考文献】
相关期刊论文 前6条
1 袁希钢,尤学一,余国琮;筛孔塔板气液两相流动的速度场模拟[J];化工学报;1995年04期
2 李群生,杨金苗;高效导向筛板的原理及其在炼油化工中的应用[J];炼油与化工;2005年03期
3 路秀林,刘玉民;网孔塔板设计[J];化学工程;1981年04期
4 黄洁,梁继平,王平;导向筛板上气液动量传递的分析[J];化学工程;1988年05期
5 王忠诚,姜斌,张雅芝,曾爱武,李鑫钢,黄洁;导向梯形浮阀塔板的特点及工业应用[J];石油化工;1998年04期
6 蒋志信;;斜孔塔板在减压塔中的应用[J];石油炼制与化工;1981年07期
，本文编号：2202283
本文链接：https://www.wllwen.com/kejilunwen/huagong/2202283.html
