填料塔中规整填料及相关装置的设计

介绍了颗粒型填料和规整填料,分析了气液再分布装置的设计要求、喷淋密度确定、设计计算、结构设计等,指出溢流槽式再分布器是适应性较好的分布器,特别适用于大流量操作。     

规整填料气体脱碳塔模拟计算

基于实际填料高度 ,本文首次建立了高效规整填料塔DEA活化热钾碱脱碳系统传质模型沿规整填料高度上CO2 气相浓度、溶液转化度、气液相CO2 分压等模拟计算结果与工业实例吻合很好     

规整填料塔液相混合的研究

本文采用点源脉冲示踪的方法考察了装填２５０ Ｙ 型金属板波纹规整填料的填料塔中的轴向及径向返混。在规整填料塔的顶部注入 Ｋ Ｍｎ Ｏ４ 作为示踪剂,从塔的底部的不同径向位置取样。通过最优化方法计算出轴向返混系数 Ｄｚ 和径向返混系数 Ｄｒ,研究了液相和气相对规整填料的返混的影响,并就液相和气相对返混影响做了初步解释。实验结果表明：径向扩散系数和轴向扩散系数随气速和液体流速的增大而增大。得到轴向和径向混合系数的彼克列数（ Ｐｅｚ , Ｐｅｒ） 与液相和气相的表观雷诺数（ Ｒｅ１ , Ｒｅｇ） 的关联式。     

波纹板规整填料塔液体分布

将填料单元处理成立体节点网,根据节点网内网线液流和节点液流各自的运动方式建立了填料单元的液体分布模型.通过将填料与塔壁间的液体交换规范成填料节点网与塔壁节点网间的液量传递建立了填料单元对应塔壁区的流体分布模型.提出了规整填料塔液体分布问题的边界条件.2个描述填料单元及其对应塔壁区液体分布的数学模型与2类边界条件共同构成了波纹板规整填料塔的液体分布模型.采用单纯形法对3个模型参数进行了估计.模型计算结果与实验数据一致,表明模型能合理地描述波纹板规整填料塔的液体分布性能.     

填料塔流体力学计算机模拟

在化工流程设计中 ,如何快捷而准确的进行填料塔设计成为化工设计中的重要课题。通过对比选择适当的理论基础和计算方法 ,通过计算机的模拟 ,编制通用的填料塔流体力学特性计算模拟程序 ,并提供一个较为友好的操作界面。经过测试 ,该软件能较好进行填料塔流体力学计算     

规整填料塔吸收NOx过程的模拟和实验研究

A mathematical model of nitrogen oxide （NOx） absorption is adopted and solved for adiabatic operation of a column with structured packings on the basis of the film theory. Removal rate, outlet concentration, oxidation degree of NOx and outlet acid concentration, liquid acid temperature are simulated and tested. The gas phase reactions and equilibria, gas phase mass transfer, interracial equilibria, and liquid phase reactions are considered in the model. Absorption of nitrogen oxides is studied in packed with Mellapak 250Y columns in series in an industrial process of 20000 t oxalic acid per year. Favorable agreement is shown between the model predictions and the on-site observations.     

规整填料塔的壁流量计算

推导了板波纹填料塔的壁流量计算方法 ,并探讨填料层分段高度的选择。     

新型高效规整填料塔在甲醇精馏中的应用

上海焦化有限公司200kt／a甲醇装置原先采用的是以浮阀塔技术为基础的三塔精馏生产工艺。为了满足2003年投产的140kt／a甲醇新装置的生产需要，上海焦化有限公司与天津大学合作，将原先精馏系统改造成新型高效填料塔的三塔精馏生产工艺。改造后，生产能力由原来的200kt／a增大为现在的350kg／a，同时在生产效率、产品质量和能耗等方面也有所改善。     

孔板波纹填料塔及结构设计

孔板波纹填料塔，作为一种高效填料塔正受到广泛重视，文中首先比较了几种塔盘的性能，然后探讨了孔板波纹填料塔的结构设计，并指出了其应用前景。     

填料塔的气体分布装置

介绍了填料塔的进气结构、几种新型气体分布装置及其多腔分布结构的形式。     

规整填料内气液两相流动与传质的计算传质学模型

Detailed investigation of flow behavior in structured packing distillation columns is of great importance in accurate prediction of process efficiency and development of more efficient and optimal equipment internals. In this study, a three-dimensional two-phase flow model based on VOF method for simulating the hydrodynamics and mass-transfer behavior in a typical representative unit of the structured packing is developed. In the proposed model, the model is used for the closure of turbulent mass transfer equation. By solving the proposed model, the velocity distribution, phase fraction profile and concentration field are obtained. Using these data, the total liquid holdup, the wetted area and the separation efficiency [height equivalent to a theoretical plate (HETP)] are estimated. For testing the model validation, the simulated HETPs are compared with our previous experimental data obtained in a 150 mm-diameter column containing Mellapak 350Y operating at the pressures of 0.6-1.8 MPa. The compari-son shows that they are in satisfactory agreement, with an average absolute deviation (AAD) of 25.4%.     

Experimental and CFD Simulation Study for the Wetting of a Structured Packing Element with Liquids

The hydrodynamics of liquid flow in packed columns affects the column performance from the point of view of heat and mass transfer. The interfacial and the specific wetted areas are decisive in this case. The complex three‐dimensional liquid flow on a single structured and flat packing element of Rombopak 4M was investigated. It consists of four connected wavy inclined plates in an X‐shape configuration. The geometric characteristics of the packing were related to the fluid mechanics of the liquid distribution. CFD simulation results for different cell sizes and flow rates, obtained using the VOF (volume of fluid) model, are presented as being capable of describing this complex geometry. With the help of the CFD simulation and the experimental results from Rombopak 4M, correlations from the literature describing the interfacial and wetted area and liquid holdup in packed columns were adjusted to describe the hydrodynamic performance of Rombopak 4M.     

规整填料塔的设计计算模型

针对规整填料塔的特点和近年来的研究进展 ,分析了规整填料内的流体力学和相间传质行为 ,并对规整填料塔内压力降、液泛及气液传质设计计算模型进行比较 ,同时指出了高压填料塔设计计算中应注意的问题。     

新型安全轮胎的设计及其有限元仿真分析

以235/45R18子午线轮胎为基础,以质量小、弹性优异的发泡弹性聚氨酯为内支撑体制备新型安全轮胎,用非线性有限元软件ABAQUS对其进行静态力学特性分析。结果表明:新型安全轮胎采用连通充气设计,能够在标准气压下正常行驶,不影响其操控性和舒适性;当轮胎漏气时,内支撑体与轮胎内衬层接触,内支撑体与胎侧共同承受载荷,从而减小胎侧部位的形变量,保证车辆能正常行驶到安全区域。     

Liquid Flow on Structured Packing: CFD Simulation and Experimental Study

A CFD model of the two‐phase countercurrent flow in the geometry of the plate‐type structured packing Mellapak 250.Y was built, tested and verified. The model was applied to determine the effect of liquid and gas flow rates and physicochemical properties of the flowing liquids on the interfacial area formed on structured packing. The CFD model allowed us to determine the minimum liquid flow rate at which an unbroken liquid film was observed on the packing surface. The simulations confirmed that with an increase of the wetting rate the surface of the packing covered with a liquid film increased until the surface was totally covered up, while further slight changes of an interfacial area were the result of wave formation. The effect of gas load (F factor) on the film surface was in the range of a calculation error. Results of the CFD simulation allow us to predict the stages of film formation during liquid flow, to follow local velocity oscillations, film thickness and velocity profiles of phases.     

规整填料塔内液相返混的CFD模拟

通过对规整填料塔内部结构的分析,认为其内部存在三种基本结构单元：同一盘填料内的交叉单元、上下两盘填料旋转90度的衔接单元和填料与塔壁的衔接单元。使用RNG k—ε湍流模型对不同的结构单元进行三维CFD模拟计算,发现不同的结构单元具有不同的流动特性。同时．使用示踪激励响应技术,研究了不同结构单元的轴向返混情况。     

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.     

挤出机头流道的有限元模拟和优化

以塑料挤出机头中片材流道作为研究对象,建立其挤出加工过程的数学模型,并利用仿真软件Polyflow模块对挤出机头流道的流场进行仿真研究,仿真结果将为机头流道的结构设计和优化提供了理论基础。     

板波纹填料铜洗塔的设计及应用

本文通过对铜洗塔的技术改造,系统介绍了规整板波纹填料塔的设计设计方法及步骤,主要包括过程工艺计算、流体力学核算和塔内件结构设施。实践证明,应用新型塔内件的高效规整填料塔技术改造铜洗塔,效果良好。