计算流体国学在精馏塔板上的应用

本文对计算机流体力学（CFD）在精馏塔板上的应用进综述。介绍了计算流体力学对塔板流场的模拟,数值解法,实验研究及对塔板传质过程的理论研究。同时给出了典型数学模型的主要计算结果,并对以后的研究工作给出了建议。     

计算流体力学(CFD)在精馏塔板上的应用

介绍了计算流体力学(CFD)数学模型的发展状况,以及计算流体力学(CFD)在塔板流场上的应用。总结了相关实验研究进展,并对塔板流场今后的研究进行了展望。     

利用计算流体力学方法研究精馏塔板上的液相流动

A computational fluid-dynamics model is presented for predicting the two-phase two-dimensional liquid phase flow on a distillation column tray based on the modification of Navier-Stokes Equation by considering both the resistance and the enhanced turbulence created by the uprising vapor. Experimental measurement of the local liquid phase velocity on an air-water simulator of 1.2 m in divaneter by using the hot film anemometer is briefly described. Two of the conventional fluid-dynamic constants are readjusted for the case of liquid flow on a tray byfitting the experimental data. The predicted local liquid phase velocity and direction of flow by the present model are confirmed satisfactorily by the authors‘ experimental measurements and by the data from literature. By the aid of the present model, the concentration field on the tray can be computed for the evaluation of the enhancement of liquid phase concentration across a tray. The advantages of applying computational fluid-dynamics to tray column design are discussed.     

精馏塔板上双液层三维模型的流体力学计算

在充分研究塔板上气液两相之间相互作用的基础上,运用双流体层三维模型,根据气体存在的形态将在泡沫工况下的液层在液体的厚度方向上分为喷射层和鼓泡层,将其特征与计算流体力学（CFD）结合起来,得到和实验观察比较一致的结果.     

丁二烯萃了精馏塔的流体力学计算

本文考虑了二烯萃取塔真实汽，液相负荷分布和塔板结构，完成了流体力学核算，对实际操作具有一定的指导意义。     

计算流体力学在精馏塔研究方面的应用进展

计算流体力学(CFD)已成为研究精馏塔内气液两相流动和传质的重要工具,应用它可得知塔内气液两相微观的流动状况。本文对CFD的发展历史和CFD的通用软件的情况以及CFD在精馏塔研究方面的应用进行了综述。重点介绍了CFD在模拟板式塔塔板上和填料塔内气液两相的流动状况上的应用。     

丁二烯萃取精馏塔的流体力学计算

本文考虑丁二烯萃取塔真实汽、液相负荷分布和塔板结构，完成了流体力学核算，对实际操作具有一定的指导意义     

计算流体力学数值模拟技术在陶瓷梭式窑中的应用

陶瓷间隙式窑炉，尤其是梭式窑炉，是陶瓷窑炉发展的趋势所在.运用计算流体力学（computational fluid dynamics，CFD）数值模拟技术对它进行研究，可以克服由于影响因素众多而难以进行实验研究的缺点.本文通过CFD商用软件FLUENT对窑内的温度、速度和压力流场等进行研究和分析，得出一些较为合理的建议，为今后指导窑炉的设计和陶瓷生产过程提供参考。     

搅拌反应器内计算流体力学模拟技术进展

综述了计算流体力学(CFD)技术应用在搅拌反应器的进展情况。重点对搅拌反应器内流动场模拟的各种处理方法,包括"黑箱"模型法、内外迭代法、多重参考系法和滑移网格法,进行了介绍与评价,指出了各种方法所具有的特点及存在的问题。阐述了搅拌反应器内CFD技术的发展方向,并就国内的研究现状进行了简单概述。     

计算流体力学在裂解炉设计上的应用

阐述了计算流体力学(CFD)在石油化工领域，特别是在裂解炉技术上的应用。内容共分两部分：1．国外公司在裂解炉设计及故障诊断中CFD软件的应用简介。2．应用CFX软件对裂解炉中的关键技术的模拟、分析及计算情况的综述。     

塔板液相三维流场的研究(Ⅱ)CFD模拟

本文应用计算体力学软件STAR—CDV3．1求解了1．2m直径光板的三维流速场分布，文中应用K-ε模型封闭雷诺方程，构成二方程模型。计算过程中，采用了压力修正法中的SIMPLE算法，贴体网格及局部加密技术。理论计算与光板上热膜风速仪的实测结果吻合较好，这表明了前文提出的一种基于理论的测量塔板三维流场的新方法是合理的。     

混合箱塔板流体力学性能实验研究

研究开发了一种大通量高效率的混合箱塔板 ,它的非传质区仅占塔截面积的 5 %左右 ,在塔板上设计了用于提高气液传质效率的混合箱结构。在冷模试验塔内对混合箱塔板的压降、漏液、雾沫夹带以及降液管清液层高度等流体力学性能进行了试验 ,试验表明该塔板的漏液和雾沫夹带都比传统筛板有所减少 ,且通量大幅度提高     

利用计算流体力学及计算传质的方法研究精馏塔传质效率

It has long been found that the flow pattern of the liquid phase on distillation tray is of great importance on distillation process performance. But until now, there was very few published work on quantitative investigation of this subject. By combining the computational fluid dynamics (CFD) with the mass transfer equation, a theoretical model is proposed for predicting the details of velocity and concentration distributions as well as the tray efficiency of distillation tray column. Using the proposed model, four different cases corresponding to different assumptions of liquid and vapor flowing condition for a distillation tray column were investigated. In Case I, the distributions of velocity and concentration of the incoming liquid from the downcomer and the uprising vapor from the underneath tray spacing are uniform. In Case Ⅱ, the distribution of the incoming liquid is non-uniform but the uprising vapor is uniform. In Case Ⅲ, the distribution of the incoming liquid is uniform but the uprising vapor is non-uniform.In Case IV, the distributions of both the incoming liquid and the uprising vapor are non-uniform. The details of velocity and concentration distributions on a multiple sieve tray distillation column in four different cases were simulated using the proposed model. It is found that the shape of the simulated concentration profiles of vapor and the liquid is quite different from case to case. The computed results also show that the tray efficiency is highly reduced by the maldistribution of velocity and concentration of the incoming liquid and uprising vapor. The tray efficiency for Case Ⅰ is higher than Case Ⅱ or Case Ⅲ, and that for Case Ⅳis the lowest. It also reveals that the accumulated effect of maldistribution becomes more pronounced when the number of column trays increased. The present study demonstrates that the use of computational method to predict the mass transfer efficiency for the tray column, especially for the large one, is feasible.     

精馏塔板液相流场三维模拟

The liquid flow on a single-pass sieve distillation tray is simulated with a three-dimensionM computational fluid dynamics (CFD) program with the K-e turbulence model. In the model, a source term SMi is formulated in the Navier-Stokes equations to represent the interfacial momentum transfer and another term Sc is added to the mass transfer equation as the source of interfacial mass transfer. The simulation provides the detailed information of the three-dimensionM distribution of liquid velocity on the tray, the circulation area and the concentration profile along the height of liquid layer.     

Three Dimensional Simulation of Liquid Flow on Distillation Tray

The liquid flow on a single-pass sieve distillation tray is simulated with a three-dimensional computational fluid dynamics (CFD) program with the K-ε turbulence model. In the model, a source term SMi is formulated in the Navier-Stokes equations to represent the interfacial momentum transfer and another term SC is added to the mass transfer equation as the source of interfacial mass transfer. The simulation provides the detailed information of the three-dimensional distribution of liquid velocity on the tray, the circulation area and the concentration profile along the height of liquid layer.     

精馏塔塔板两相流理论及实验研究

塔板上气液两相的流动状况尤其是液相的流速分布对塔板效率有重要影响。针对塔板上的气液两相流动 ,研究者提出了许多理论及实验方法 ,以期准确模拟和测量塔板上液相的流动分布。文中介绍并评价了塔板两相流动计算的各种理论模型以及两相流动测量的各种实验方法     

多种塔板组合的板式塔改造技术

介绍综合板式塔技术在重油加氢ＳＳＯＴ装置分馏塔技术改造中的应用,特别是其中采用作者开发的导向梯形浮阀塔板是首次应用于工业装置中,取得了成功。生产实践表明,导向梯形浮阀塔板具有优良的性能,同时应用多种塔板组合的综合板式塔技术,可适应于各种不同的操作工况,值得在板式塔设计和技术改造中推广应用     

Computational Fluid Dynamics Simulation of 13CO Distillation in Structured Packing

Physical 3D models were established for corrugated packing used in the enrichment of the isotope ¹³C. Computational fluid dynamics (CFD) simulation results indicated that common corrugated packing was not well wetted when used for isotope distillation. It is concluded that liquid misdistribution in the packed tower results from the structure of the packing rather than from the height of the packing beds. The existence of entrainment was also demonstrated by CFD simulation. It is proved that mass transfer equations based on the Nusselt theory are not suitable for distillation calculation in such a corrugated packing system. By comparison, the recently developed structured packing model with a corrugation geometry based on the right‐angled triangle, known as Zigzag‐pak, describes vapor‐liquid distribution properties well and has significant advantages over common corrugated packing due to its better liquid distribution character.     

Computational Fluid Dynamics Hydrodynamic Analysis of a Cross‐Orthogonal Fixed‐Valve Tray

A computational fluid dynamics model was developed to investigate the hydrodynamic characteristics of a novel orthogonal fixed‐valve tray, which offers a larger effective contact perimeter under the same orifice area than its previously reported counterparts. The liquid‐gas phases were simulated in the Eulerian framework, with the interphase momentum transfer source term based on the experimentally obtained liquid hold‐up correlation. The simulation results were consistent with the experimental data. In addition, the gas hold‐up profile of this new design was compared with its triangular cousin under the conditions of a typical run, showing that the former has a higher froth height, which indicated better interphase contact on the tray.