浮阀塔板泄漏速率的一个通用关联式

在F-1,V-4型浮阀塔板沿板泄漏速率分布的实验基础上,提出了一个同时适用于锥心及A型浮阀塔板的泄漏速率通用关联式,便于计算机工程计算.     

新型浮阀塔板的流体力学性能

在φ1 000 mm的圆塔内,采用空气－水系统,对十字旋阀塔板、组合导向浮阀塔板、ADV浮阀塔板和F1浮阀塔板的阀孔临界气速和压降进行了对比试验。此外,还对前3种浮阀塔板的泄漏和雾沫夹带进行了对比试验。实验数据由计算机实时采集和处理,试验结果综合表明：十字旋阀塔板适用于低液流强度操作状况;组合导向浮阀塔板适用于大液流强度的操作状况;ADV浮阀塔板则适用于中等液流强度操作状况。     

斜孔梯形浮阀塔板流体力学和传质性能

采用空气-水系统,在500 mm×500 mm的方形塔内,对新开发的斜孔梯形浮阀塔板的流体力学性能进行了试验研究,测定了塔板压降、泄漏和雾沫夹带。应用空气-水-CO2系统,测定了斜孔梯形浮阀塔板的效率。试验结果表明,斜孔梯形浮阀塔板具有良好的流体力学和传质性能。     

浮阀塔板上两相接触状态及相状态转变规律的探讨

本文作者对锥心浮阀塔板上气液两相的接触状态进行了实验研究,认为主要有喷溅、混合泡沫和完全泡沫三种状态.在正常的气液负荷范围内系混合泡沫状态.文中探讨了两相接触状态的转变规律与塔板入口端的清液层高度以及塔板上的雾沫夹带率有良好的对应关系,从而确定了有两个转相点.此外,还对两相接触状态的转变机理作了初步分析,得出了计算相状态转变点的准数关联式.     

浮阀塔板最新应用研究进展

浮阀塔是一种应用极为广泛的汽液传质设备,本文介绍了国内研究开发的新型浮阀塔板。这些浮阀塔板是在F1型浮阀塔板的基础上开发而成的,相比于F1型浮阀塔板,具有压降低、雾沫夹带量小、泄漏量小、处理量大等优点。本文以塔板的开发年代和塔板类型为主线,对这些浮阀塔板的结构特点、流体力学、传质性能、优缺点等进行了概括总结,对每个系列浮阀塔板的设计开发理念进行了总结概括,同时介绍了导向浮阀塔板在齐鲁石化公司丁二烯装置中应用的成功实例,很大程度地提高了塔板负荷率和产品质量;并简单介绍了一些常用塔板在工业生产中的应用情况,阐述了这些新型浮阀塔板的发展思路,即浮阀形状以条形为主,并且大部分浮阀塔板都开有导向孔;最后指出了今后塔板技术的研究和发展动向。     

组合波纹导向浮阀塔板压降的研究

在深入调研当前重要浮阀塔板的基础上,全面研究组合波纹导向浮阀塔板的压降性能.考察了开孔率、出口堰高、液流强度等因素对压降的影响,并与有孔波纹导向浮阀塔板、无孔波纹导向浮阀塔板、组合导向浮阀塔板和F1型浮阀塔板进行了对比.实验数据采用计算机实时采集与处理,并对数据进行归纳与关联,获得了压降模型的关联式,为工业设计提供了依据.结果表明在不同气液负荷下组合波纹导向浮阀塔板有很好的压降性能,尤其在小液流强度下与其他浮阀塔板相比有明显的优势.     

L1条型浮阀塔板的性能与工业应用

介绍了条型浮阀塔板的试验室研究结果以及其性能与Ｆ１型浮阀塔板的对比。在几个不同规模的分馏塔中，用条型浮阀塔板取代Ｆ１型浮阀塔板进行技术改造，提高了处理能力，改善了产品分割质量，提高了轻质油收率。研究和工业生产实践表明，条型浮阀塔板的综合性能优于Ｆ１型浮阀塔板。     

微分浮阀塔板的研究和应用

应用空气 -水系统 ,在直径 6 0 0 mm的塔内 ,对微分浮阀塔板的流体力学进行了实验研究 ,测定了临界孔速、塔板压降、雾沫夹带率和液体泄漏率。应用空气 -水 -氧气物系 ,测定了微分浮阀塔板的传质效率。并与 F1型浮阀塔板进行了对比实验研究。实验结果表明 :微分浮阀塔板比 F1型浮阀塔板具有更好的流体力学和传质性能 ,并对实验数据进行了关联 ,获得了计算临界孔速、塔板压降、雾沫夹带率和泄漏点孔速的关联式 ,可用于微分浮阀塔板的设计计算。文中还介绍了微分浮阀塔板的工业应用情况     

组合导向浮阀塔板的开发研究

在导向浮阀塔板的基础上,开发研究了组合导向浮阀塔板.组合导向浮阀塔板与导向浮阀塔板相比,具有更好的操作性能,并且液体负荷的适用范围增大.实验研究和工业应用表明,组合导向浮阀塔板具有处理能力大、塔板效率高、操作弹性好等突出特点,用于汽液传质过程,可获得良好效果.     

组合波纹导向浮阀塔板的泄漏率

在φ1000 mm的圆塔内,以空气–水为介质,对组合波纹导向浮阀塔板的泄漏率进行了测试,考察了出口堰高、液流强度、开孔率等因素对泄漏性能的影响,并将其与有孔波纹导向浮阀塔板、无孔波纹导向浮阀塔板、组合导向浮阀塔板和F1型浮阀塔板的泄漏率进行了对比.结果表明:组合波纹导向浮阀塔板在不同气液负荷下有很好的泄漏性能,尤其在小液流强度下比其他浮阀有明显的优势.     

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。     

单斜孔塔板流体力学性能研究

在有机玻璃冷模实验装置上，用空气－水体系测试了单斜孔塔板的流体力学性能，得到了不同情况下的塔板压降、临界孔速、板上清液层高度等重要参数，关联出压降的计算公式，并进行了分析和讨论。发现斜孔塔板的阻力系数是随着孔动能因子变化的，在正常的操作条件下，阻力系数的平均值约为1．94。     

FST高效塔板传质元件内气相流场的数值模拟

FST高效塔板是一种喷射型塔板,同鼓泡型塔板相比,具有高通量、低压降等特点。塔板传质元件的结构会很大的影响塔板的传质效率和压降,为了优化塔板结构设计,提升塔板性能,有必要研究不同结构传质元件的效果。本文使用FLUENT软件对FST高效塔板传质元件开展数值模拟研究,得到传质元件内部气相流场,对比了3种结构传质元件内部气相流场的分布情况,考察了除雾叶片、旋流叶片径向角对气相流场的影响。结果显示除雾叶片会增强传质元件的除雾效果,降低塔板的雾沫夹带,但也会带来额外的塔压降。旋流叶片径向角会增强气相旋流强度,强化传质效果,但是也会带来压降过大、回流过大的问题。为优化设计塔板传质元件,应综合考虑各结构因素的影响,合理平衡塔板压降与传质效果、除雾效果。     

EFFECT OF BAFFLE ON TRAY UNDER OSCILLATING CONDITION

Effect of baffle on a tray under oscillating conditions has been examined experimentally. To reduce the degree of liquid mixing and liquid channeling under oscillating conditions, it is necessary to install the baffles on tray.

Experiments were conducted with the air-water system, ft was found that the pressure drop change can be expressed as a sinusoidal function and the period coincides with tray oscillation. The degree of liquid mixing decreases when the baffles are installed on tray and it also decreases with the increase of liquid flow rate. The pressure drop increases with the installation of baffle on tray.

The suitable baffle number on tray is from 4 to 8 and in this region, the degree of liquid mixing reaches minimum and the liquid holdup takes a maximum value. @KEYWORDS: Tray, Oscillating, Liquid mixing, Baffle, Pressure drop, Liquid holdup.     

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     

Hydrodynamics performance and tray efficiency analysis of the novel vertical spray packing tray

Column setup has been widely utilized in the petroleum and chemistry industries. However, with the fast progress of industries and the increasingly serious energy shortage, designing a new column setup with better performance and higher capacity becomes more urgent. In order to improve column's capacity and expand operating condition, a new type of column tray named novel vertical spray packing (NVSP) tray was designed and experimented. The performances of the novel tray, including pressure drop, weeping, entrainment and tray efficiency, were tested in a plexiglass column. In addition, performances of the novel tray were compared with that of the sieve tray and the Glitsch V1 valve tray. Based on the experiment data, the mathematical correlations of pressure drop, weeping and entrainment for the novel tray were established by regression analysis method. A fundamental model of dry pressure drop of the novel tray was promoted at the form of sum mode. The results indicate that the novel tray has wider operating condition and better performance.     

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.     

Hydrodynamic characteristic of Conical Cap tray: Experimental studies on dry and total pressure drop,weeping and entrainment

This paper addresses an experimental investigation in the hydrodynamic behavior of a new type of cap trays called Conical Cap tray (ConCap tray). The hydrodynamics of the tray was investigated in a commercial scale air–water column with an internal diameter of 1.2 m. The experimental liquid loads were 29.9, 44.4, 60 and 74.4 (m³/h)/m of weir length and gas flow in terms of F_s in the range of 0.2–1.5 m/s (kg/m³)^0.5. The dry pressure drop, total pressure drop, weeping and entrainment for the ConCap tray and a valve tray were measured and compared. Correlations for pressure drop, weeping and entrainment of the ConCap tray were provided using regression analysis method. Standard deviations of correlations, R², are quoted. The ConCap tray was compared with a bubble cap tray using correlations. The pressure drop of the ConCap tray was less than the bubble cap and close to the valve tray. The weeping rate of the ConCap tray was less than the valve tray. Its entrainment is more than the valve tray and less than the bubble cap tray. Good turndown ratio is important characteristic of the ConCap tray which is achieved without having too much pressure drop.     

Flow regimes and pressure drop of a composite tridimensional rotational flow sieve tray under concurrent gas-liquid flow

A composite tridimensional rotational flow sieve tray (CTRST) is proposed. The flow patterns of CTRST were visually categorized, combined with the standard deviation of the pressure difference. In the TRST area of the internal packing-type tray, the membrane-drip column and foam-embolic flow is present, while bubbly and milk froth-ribbon flow is present in the packing area of the external packing-type tray. The effect of the tray structure parameters on the pressure drop under co-current flow was investigated. The dry and wet pressure drop is within 160 and 900 Pa, respectively. Under the same structural parameters, the pressure drop of the internal packing-type tray was higher than that of the external packing-type tray. The flow characteristics of the standard tray under the countercurrent flow were compared. The CTRST was found to be more suitable for co-current flow. A prediction model pressure drop under co-current was established with an error of 15.5%.     

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。