共查询到20条相似文献,搜索用时 125 毫秒
1.
本文提出一种新型的复合填料塔设备,将穿流筛板引入到填料塔中。同普通填料塔相比,复合填料塔优化了液体分布和再分布装置,节省了大量空间,压降低,穿流筛板本身又有优良的传质性能,因此具有比普通填料塔更好的性能。并对复合填料塔传质性能进行了测定和关联,得到了传质性能基础数据,可为复合填料塔的设计应用提供参考。 相似文献
2.
New models for describing hydrodynamics and mass transfer performance in supercritical fluid extraction columns were proposed.Those models were proved by experimental data,which were obtained in supercritical fluid extraction packed column,spray column and sieve tray column respectively.The inner diameter of those columns areΦ25mm,These experimental systems include supercritical carbon dioxideisopropanol-water and supercritical carbon dioxide-ethanol-water,in which supercritical carbon dioxide was dispersed phase,and another was continuous phase.The extraction processes were operated with continuous countercurrent flow.The predicted values are agreed well with experimental data. 相似文献
3.
复合填料萃取塔操作性能研究 总被引:3,自引:0,他引:3
在内径为0.1m,高度为1.0m的玻璃萃取塔中,对四种不同填料用低界面张力体系(正丁醇-丁二酸-水)研究了填料塔的流体力学和传质性能,实验结果表明,用其中的两种填料组合的复合填料萃取塔具有较大的通量和较高的传质效率,可望在工业装置中得到推广应用。 相似文献
4.
5.
6.
从工程应用角度介绍填料塔传质发展概况2,重点归纳填料怪的有效面积和传质单元高度或传质系数研究的重要结论,并作扼要的分析和讨论;提出填料塔设计中确定安全系数所应的一些问题。 相似文献
7.
在内径为100mm的填料塔内,以空气-水为物系,对新开发的塑料星形填料的流体力学和传质性能进行了测定.通过对实验数据的回归分析,推出了其填料层压降、液泛气速和液相总体积传质系数的关联式. 相似文献
8.
9.
分析新型金属格栅填料结构特点,设计出锯齿型和平直型舌片的格栅单元。测定了两种格栅单元在不同排列间距下,相邻层间无旋转时的流体力学和传质性能。得出排列间距36mm锯齿型格栅综合性能最优的结论。测定其相邻层间45°旋转排列时流体力学和传质性能,结果表明综合性能优越。 相似文献
10.
开式涡轮转盘塔用于液液固体系的性能研究 总被引:1,自引:0,他引:1
由转盘塔改型的开式涡轮转盘塔是一种新型的搅拌萃取塔,它适用于固含量较高的体系.其特点是每个转盘下方有3条叶片.选用水-煤油-石英砂体系,以丁酸为溶质,在内径52mm的塔中作流体力学和传质实验.结果表明,传质方向对液体分散相滞留率、固相滞留率和体积传质系数都有一定影响.固体颗粒的存在可降低扩散单元高度,但对传质并不总是有利. 相似文献
11.
The steady state hydrodynamics of the holdup in a 15 cm column agree quite well with mechanistic predictions at conditions approaching flooding. In the presence of mass transfer (acetic acid from the dispersed kerosene phase to the continuous water phase), the holdup data below flooding are not well predicted by the model due to enhanced droplet coalescence. The prediction of holdup at flooding is a function of the ratio of the flow rates but is independent of the physicochemical properties of the extraction system, and therefore can be used to estimate the flooding holdup regardless of the occurrence of mass transfer. In the second part of the paper, steady state mass transfer characteristics of the column were also simulated using a mechanistic model. Despite the difficulty of estimating parameters such as the mass transfer coefficient, the model curves could be arbitrarily adjusted to fit observed exit concentrations. These steady state results provide useful insights on the non-linearity of the system from a control viewpoint. 相似文献
12.
13.
14.
15.
In a series of two papers the results of investigating the mass transfer characteristics of two gas-liquid reciprocating plate columns of the Karr type by different methods are presented. The subject of the first part is a study of the liquid phase volumetric mass transfer coefficient, kLa, while the second part deals with the interfacial area. The volumetric coefficient kLa was investigated using the sulphite method, the pure physical absorption of oxygen, and a dynamic method under culture conditions, the second of these three methods being the most favorable. Very good agreement among these methods was found. Generally, kLa increased with increasing vibration intensity, superficial gas velocity, and the number of perforated plates. Liquid-phase properties appeared to affect kLa only slightly. The coefficient kLa was correlated in terms of the maximum power consumption and the superficial gas velocity: 相似文献
16.
The hydrodynamics and mass transfer characteristics of a pulsed packed column (PPC) filled with a stainless steel super mini ring (SMR), ceramic and stainless steel Raschig rings have been studied using a 30% tributyl phosphate‐kerosene (dispersed phase)/acetic acid/water (continuous phase) system. Experiments were performed in a 100 mm internal diameter column with 1.0 m height of packing. The mass transfer and axial mixing parameters were estimated simultaneously from the measured concentration profiles of two‐phase based on the backflow model. It was found that pulsation has great influence on hydrodynamics and mass transfer characteristics of PPC with the SMR. Hoxp and Hox decrease significantly with pulsation, whereas flooding velocity decreases only slightly. Comparison among the three types of packing showed that the SMR has superior characteristics both in terms of capacity and mass transfer efficiency. The influence of mass transfer on characteristics of PPC was also studied. New empirical equations of characteristic velocity, Hoxand Hoxd were proposed and good agreement between calculated and experimental data was obtained. 相似文献
17.
Huahai Zhang Zhongshan Guo Yuelin Wang Xiankun Shen Tiefeng Wang 《American Institute of Chemical Engineers》2023,69(3):e17843
The effects of particle concentration and size on hydrodynamics and mass transport in an air–water slurry bubble column were experimentally studied. When the particle concentration αs increased from 0% to 20%, the averaged gas holdup decreased by ~30%, gas holdup of small bubbles and gas–liquid volumetric mass transfer coefficient decreased by up to 50%, while the gas holdup of large bubbles increased slightly. The overall effect of particle size was insignificant. A liquid turbulence attenuation model which could quantitatively describe the effects of particle concentration and size was first proposed. Semi-empirical correlations were obtained based on extensive experimental data in a wide range of operating conditions and corrected liquid properties. The gas holdup and mass transfer coefficient calculated by the correlations agreed with the experimental data from both two-phase and three-phase bubble columns, with a maximum error <25%. 相似文献
18.
The influence of viscoelasticity on gas hold-up and the volumetric mass transfer coefficient in a bubble column is discussed and examined experimentally. It was found that the gas hold-up increased due to an increase in the number of entrapped very small bubbles formed because of the elasticity of the liquid. On the other hand, a decrease in volumetric mass transfer coefficient due to the fluid elasticity was observed. Qualitative effects of an antifoam agent and a draft tube on the performance of the bubble column with viscoelastic fluids were also examined. 相似文献
19.
The effects of liquid-phase viscosity, pseudoplasticity, and viscoelasticity on gas-liquid mass transfer in a bubble column have been investigated using aqueous solutions of sucrose, xanthan, polyacrylamide, and mixtures of xanthan and polyacrylamide. The elastic properties, considered in the form of the Weissenberg number, decreased the volumetric mass transfer coefficient by a factor of up to 5. The effect was strong even at low Weissenberg numbers encountered in many liquids, the elasticity of which is usually neglected. 相似文献