筛孔型润德塔盘的流体力学性能

以空气和水为介质,对筛孔型润德塔盘的流体力学性能进行实验研究,通过冷模实验考察其固阀开孔率、F因子、喷淋密度对干板压降、总板压降、清液层高度、平均泡沫层高度、操作弹性的影响,并与传统筛孔穿流塔盘进行比较. 结果表明,在操作范围内,筛孔型润德塔盘的操作弹性比传统穿流筛孔塔盘平均提升34.15%,固阀开孔率为33.3%的筛孔型润德塔盘总板压降比传统筛孔穿流塔盘平均低72.38%,比固阀开孔率为50.0%和66.7%的塔盘的干板压降平均低88.8%和206.3%,最佳固阀开孔率为33.3%. 得到筛孔型润德塔盘干板压降关联式为pd=49.98F1.785.     

CFD and experimental studies of liquid weeping in the circular sieve tray columns

Sieve trays are widely used in fractionating devices like tray distillation towers existing in separation and purification industries. The weeping phenomenon that has a critical effect on the efficiency of tray towers was studied by a numerical model and some experiments. The experiments were carried out in a pilot scale column with the diameter of 1.22 m that includes two test trays and two chimney trays. Weeping rates and some hydraulic parameters were measured in sieve trays with the hole area of 7.04%. Furthermore, the total weeping rate and weeping rate in inlet and outlet halves of the test tray were determined. It was also used an Eulerian–Eulerian computational fluid dynamics (CFD) method for the present study. The model was able to predict the dry tray pressure drop, total pressure drop, clear liquid height, froth height, and weeping rate simultaneously. Furthermore, the obtained CFD results were in a good agreement with the experimental data in terms of pressure drop and the model properly predicted several hydraulic parameters like the liquid weeping behavior along the tray.     

A Novel SiC Foam Valve Tray for Distillation Columns

The novel SiC foam valve tray was made of thin slices of SiC foam material with a high specific surface area. Hydrodynamic performances of the novel SiC foam valve tray were studied with air-water system at atmospheric pressure. These performance parameters included pressure drop, entrainment, weeping and clear liquid height. The mass transfer efficiency of the SiC foam valve tray was measured in laboratory plate column. Compared with the F1 float valve tray, the dry pressure drop was decreased about 25%, the entrainment rate was about 70% lower at high gas load, the weeping was much better, and the mass transfer efficiency was far higher. Thus, the overall performance of the novel SiC foam valve tray was better than that of F1 float valve tray.     

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     

垂直筛板和T形排列条形浮阀塔盘的初步研究

在φ300mm的实验塔中,用水-空气系统对“T”形排列条形浮阀塔盘及“VST”塔盘的流体力学性能及氧解吸效率做了实验研究。得出了塔板压降、泄漏、夹带、液层阻力降以及降液管中清液层高度的初步关联式。 在相同实验条件下与F_1型浮阀塔盘的数据对比、分析的基础上,发现了VST和T形排列条形浮阀塔盘的分离效率和板压降与F_1型浮阀塔盘相当,而操作范围要比F_1型浮阀宽。     

新型正交波纹板流体力学性能CFD模拟

介绍一种新型穿流塔板--正交波纹板。以欧拉-欧拉两相流模型为基础,建立了正交波纹板上气液两相流场的三维数学模型。CFD模型中主要考虑了气液两相间的曳力作用,相间动量传递源相采用Krishna计算方法。以清液层高度为指标,对CFD模型的可靠性进行了验证。在不同气液负荷下,对正交波纹板的压降、板上液相速度分布及塔内气液分布状况等流体力学性能进行了研究,并与淋降筛板进行对比,结果表明正交波纹板具有更高的操作弹性和更好的操作稳定性。     

Hydrodynamic and Mass Transfer Performances of a New SiC Foam Column Tray

The hydrodynamic performance of a novel SiC foam column tray (SFCT), made of thin slices of SiC foam material with a high specific surface area, is investigated. The performance parameters include pressure drop, entrainment, weeping, and clear liquid height. The tests are carried out with an air‐water system under atmospheric pressure. The mass transfer efficiency of the new SiC foam column tray is studied in a stainless‐steel plate column. The results provide some important parameters for the development of this innovative SiC foam tray.     

喷嘴孔VST的流体力学和传质性能研究

本文用空气-水系统,在φ1.2m的圆塔上研究了喷嘴孔垂直筛板塔盘(喷嘴孔VST)的流体力学性能,考察了各种几何因素和流体力学条件对塔板压降、漏液、气速下限、雾沫夹带和气速上限等参数的影响,获得了相应的关联式.在φ100mm的塔上,用乙醇-水系统测定了喷嘴孔VST的板效率,并与筛板搭进行了比较.     

大型塔板液体停留时间分布与板效率研究

报导在直径 2m的筛板塔实验装置中 ,用电导率连续测量系统同时测定塔板上 12个点的停留时间分布曲线及给出典型数据 ,并提出由停留时间分布曲线换算成塔板上浓度分布曲线以及计算塔板效率的方法     

气液并流筛板式填料压降的数值模拟

基于欧拉-欧拉模型,采用CFX软件对筛板式填料的气液两相并流流动进行了模拟。将模拟所得的压降与填料的出厂特性值进行了对比,发现在液气动能参数较小的情况下,两者吻合较好。分析了该流场内的速度分布和压力分布的特点,射流卷吸作用使流场内两相流体混合,但涡旋使筛板下方压强减小,射流撞击使筛板上方压强增加。对不同结构的矩形筛板式填料的压降进行研究,结果表明：筛板孔径和液相流量是影响筛板压降的重要因素,开孔直径越小,液相流量对单板压降的影响越大;上层筛孔投影与下层筛孔相交的结构更能有效降低单板压降。液相流量较大时,两个不同板间距的单板压降曲线将相交于一点,气相流量低于此交点时,板间距越小,单板压降越大;气相流量高于此交点时,则相反。     

新结构95型塔板的流体力学性能

引　言传统的板式塔塔板开孔率有限 ,当处理量较大时 ,压降较高 ,板效率降低 .因此开发新型大通量高效率塔板具有重要的现实意义 .本研究通过改进降液管结构和板面设计 ,提高塔板的有效传质区面积 ,开发了一种新型大通量塔板——— 95型塔板 ,因该板的有效传质区面积约占全部塔板面积的95%而得名 .本文以水和空气体系对 95型塔板进行了流体力学和流动性能试验 ,同时与传统筛板进行了比较 ,对试验测定的数据进行了关联 .1　试验装置及筛板结构参数试验塔为一直径Φ1 0 0 0ｍｍ的不锈钢塔 .塔内设置两块塔板 ,上板为测试板 ,下板为气体分布板 …     

Study on Jet Coflow Packing Tray

Experimental study on hydrodynamics and mass transfer efficiency of jet coflow packing tray (JCPT) was conducted in a φ285 mm column and a φ200 mm column, respectively. Compared with new vertical sieve tray which has been applied in the petrochemical industry since 1968, the JCPT has lower pressure drop, higher capacity and higher mass transfer efficiency, and seems promising in commercial application.     

泡罩垂直筛板性能研究

选用BVS-1型和BVS-2型泡罩垂直筛板,用水和空气模拟塔内气液二相流动工况,在一定时间内采集雾沫夹带量和漏液量,研究其流体力学性能和操作弹性。结果表明:前者操作弹性比大于2,最大可达到3.5;用微差压计测得在操作弹性范围内的总板压降为850—1 400 Pa;采用氧解吸方法测试单板效率,对流体力学性能较好的BVS-1型泡罩垂直筛板和现有的垂直筛板在传质性能上进行了比较,前者比后者的单板效率提高了约20%。     

Hydrodynamics of Distillation Tray Column with Structured Catalyst Containing Envelopes: Experiments versus CFD Simulations

We report studies on the hydrodynamics of a distillation sieve tray column in which structured catalyst containing wire‐gauze envelopes are dispersed along the liquid flow direction. The gas and liquid phases are in cross‐current contact on the tray and were studied using Computational Fluid Dynamics (CFD). Experiments were carried out to determine the clear liquid height on a rectangular tray as a function of geometry and operating conditions. The agreement between the experiments and CFD simulations was found to be very good, suggesting that CFD simulations can be used for design and scale‐up purposes.     

垂直筛板流化床中FCC催化剂的流化性能

以FCC催化剂颗粒研究垂直筛板流化床内构件对气固两相流化性能的影响,考察了板孔气速、颗粒循环量和帽罩开孔比等筛板结构对流化床压降和提升量强度的影响. 结果表明,气固两相总体逆流流动条件下,帽罩内气速达4 m/s,气固高速并流喷射无气泡,两相接触好、返混小,属快速流态化. 由于没有气泡,床层压力波动小,在塔板上颗粒返混小. 垂直筛板压降随板孔气速、帽罩底隙高度增大而增大,随帽罩开孔比、板孔径增大而减小,颗粒提升量大,床层压降大. 提升量强度随板孔气速、帽罩底隙高度、颗粒循环量增加而增大,随帽罩高度与塔节高度比增大而减少,随帽罩筛孔孔径变化存在最大值. 当帽罩开孔比为1.2~2.5、板孔面积与帽罩截面积比为0.42、帽罩底隙高与板孔孔径比为0.36~0.64时帽罩流化性能较好.     

筛板精馏塔的板效率研究

在直径为0.75 m,塔高4m的不锈钢热模塔内,以正庚烷—环己烷为物系、在常压、全回流条件下,进行筛板塔传质效率的研究,选取孔径为13mm和6 mm,开孔率为3.9％和6.4％的塔板,测试了这些塔板的气液相默弗里板效率,通过排列组合,考察了孔径、不同塔板位置和出口堰高对传质效率的影响,并进行了传质效果对比.此外还运用A...     

Computational fluid dynamic simulation of MVG tray hydraulics

The flow pattern and hydraulics of a Mini V-Grid valve (MVG) tray is predicted by using computational fluid dynamics simulation. A 3-D CFD model in the Eulerian framework was used. The simulation results for MVG tray are compared with that of sieve tray. The sieve tray geometry and operating conditions are based on the Solari and Bell’s sieve tray [1]. The MVG tray differs from that of Solari and Bell’s sieve tray solely by the difference in design of available openings for the flow of gas. The simulation results show that the clear liquid height and the pressure drop of MVG tray are lower than that of sieve tray whereas the liquid velocity is higher and contacts of phases are good. The simulation results of sieve tray are in agreement with the experimental data of Solari and Bell [1].     

CTST-F1复合塔板的实验研究

结合CTST和F1浮阀各自的优点,在CTST塔板的基础上组合得到了新型的CTST-F1复合塔板.以空气-水为物系,在直径为570 mm的有机玻璃冷模实验塔内,对CTST-F1复合塔板的清液层高度、板压降、雾沫夹带、漏液量等流体力学性能进行了实验测定,并与CTST塔板和F1浮阀塔板的性能进行了比较.由实验数据关联得到了复...     

高效导向筛板的研究开发及其工业应用

介绍了高效导向筛板的研究开发思路,阐述了其结构与特点,并详细介绍了高效导向筛板在石油、化工领域的推广应用情况。高效导向筛板具有生产能力大、分离效率高、塔压降低、 抗堵性强、造价低廉、拆装方便等特点,具有适应于现代化工大通量、高效率、低能耗生产要求的优越性与广阔的市场推广前景,在实际应用过程中取得了巨大的经济效益、社会效益及环境效益。