QH-1型扁环填料用于高液气比操作时的性能研究

在内径186mm有机玻璃塔中 ,对16和2 5QH 1型扁环填料的流体力学和传质性能进行了研究 ,得出了计算其压降、液泛气速、泛点填料因子、湿填料因子和液相总传质单元高度的关联式。并与16鲍尔环填料进行比较 ,结果表明 ,QH 1具有优良的流体力学和传质特性。     

用于高液气比吸收过程的填料优选和数学模型的研究

在(φ)600填料塔中,用空气-富氧水系统在很宽的液体喷淋密度范围内(20～220 m3/(m2·h))对(φ)50QH-2扁环、(φ)63 QH-2扁环、Mellapak 125X、与(φ)38 鲍尔环的流体力学和传质性能进行了研究,结果表明,与鲍尔环相比,QH-2扁环的阻力小,通量大,传质效率高,综合性能优异.而Mellapak 125X通量虽然很高,但传质效率明显低于QH-2扁环和鲍尔环.给出了计算QH-2扁环压降、液泛气速和传质单元高度的关联式.     

QH－1型扁环填料的气液接触性能

本文简要介绍了新近研制的ＱＨ－１型扁环填料对于汽液接触过程的流体力学与传质性能。实验表明，这种填料具有通量大、阻力小、传质效率高的优点，可望代替鲍尔环等常用填料，以取得良好经济效益     

共轭环与鲍尔环在萃取过程中的应用研究

在１２０ｍｍ的萃取塔中分别测试了１６共轭环和１６鲍尔环的流体力学性能和传质性能，结果表明，共轭环的两方面性能均优于鲍尔环，同时对此作了分析。     

一种新型单体填料的气液接触性能

本文试验研究了新近研制的组合环 (UR)单体填料的流体力学和传质性能 ,并对其泛点和压降进行了关联。结果表明 ,这种填料具有通量大、阻力小和传质效率高的优点 ,可望代替鲍尔环、环矩鞍等常用填料。     

高效塔填料——共轭环的性能研究

本文总结了我国自行开发的高效散堆填料——共轭环的流体力学与传质性能,论述了共轭环的结构特点.用φ38塑料共轭环、鲍尔环、阶梯环做对比实验,其结果为:共轭环的每米压强降比阶梯环低40-45%、比鲍尔环低50—55%,共轭环的传质单元高度比阶梯环低15%、比鲍尔环低30%,即共轭环的流体力学和传质性能均比阶梯环、鲍尔环优良.     

组合环单体填料的流体力学和传质性能

本文介绍了新近研制的组合环单体填料对于汽液接触过程的流体力学与传质性能。实验表明,这种填料具有比矩鞍环填料阻力小、传质效率高的优点,可以代替鲍尔环、矩鞍环等常用填料,以取得良好经济效益。     

渗铝碳钢共轭环的流体力学和传质性能研究

采用３００的有机玻璃塔，用解吸富氧水的方法，分别测定了２５渗铝碳钢共轭环和同尺寸的不锈钢共轭环的流体力学性能和传质性能，并作了比较。分析了填料的特性数据和润湿性能的变化对传质和流体力学性能的影响。     

规整填料和散堆填料传质性能比较

通过对苯 -甲苯精馏传质系数的计算 ,比较了规整填料 ( 2 5 0 Y)和散堆填料 ( 5 0 #鲍尔环 )的传质性能。结果表明 ,规整填料的传质性能优于散堆填料。这一优势主要得益于前者的比表面积远大于后者。若以传质系数 k L、k G来比较 ,新型散堆填料要强于规整填料。如何提高规整填料单位面积的传质强度是新型规整填料发展的重要方向     

高比表面积金属丝网波纹填料的实验研究

在50 mm的微机化多功能精馏实验装置中,以乙醇-正丙醇为体系对4种高比表面积(分别为900,1100,1700,2500 m2/m3)的金属丝网波纹填料的流体力学和传质性能进行了研究。结果表明,2500Y型填料的阻力很高而传质效率较低。其他3种填料的传质效率随比表面积增大而提高,但900Y和1100Y型填料的综合性能较好。     

Gas-Liquid mass transfer in fixed-bed reactors with cocurrent downflow operating in the pulsing flow regime

Liquid-side mass transfer coefficients were measured for cocurrent two-phase downflow in 5 and 10 cm diameter columns pakced with 2.5 and 4 mm Raschig rings. Experiments were specifically carried out in the pulsing flow regime. The mass transfer coefficients were determined via absorption of CO₂ into buffer solutions with the advantage of a high absorbing capacity. Thus columns of 1 m length could be used. Relations are proposed based on the hydrodynamic phenomena observed in pulsing flow. From these relations a correlation for k_L is found in terms of flow rates and packing characteristics that satisfies the experimental data.     

新型均流填料塔的传质性能研究

提出了一种新型均流填料塔设备,在Φ600 mm的圆形冷模实验塔中,以空气-水-CO2为工质进行了CO2解吸试验,利用滴定法测定了多种气液负荷下新型均流填料塔的传质性能,并在相同工况下与鲍尔环填料塔进行了对比研究。试验结果表明:在试验喷淋密度下,新型均流填料塔与鲍尔环填料塔相比,液相传质单元高度降低了19%以上;随着喷淋密度的降低,液相传质单元高度降低更加显著。在正常操作范围内,新型均流填料塔的传质效率远高于鲍尔环填料塔,是一种传质性能优良的新型填料塔设备。     

塑料异型矩鞍填料的流体力学及传质性能研究

在内径300 mm塔中,以空气-氨-水为物系,对开发出的一种新型塑料散装填料———异型矩鞍填料的流体力学及传质性能进行了研究。获得了该填料的几何特性、流体力学性能及传质性能数据,并通过对实验数据的回归分析,得出了填料层压降Δp/Z、泛点填料因子F及气相总传质单元高度HOG的关联式。研究结果表明,塑料异型矩鞍填料具有通量大、压降低、气液分布均匀及传质性能优良等优点。     

Investigation of hydrodynamic and mass transfer of mercaptan extraction in pulsed and non-pulsed packed columns

We investigated the hydrodynamic behavior and mass transfer characteristics of a pilot-scale conventional packed bed extraction column of mercaptan removal from liquid propane. The extraction column was filled with pall rings structured packing where mercaptan was extracted from the continuous phase to the dispersed phase, accompanied by a chemical reaction in propane-mercaptan-caustic system. The pulsing was introduced into the column to enhance the mass transfer rate. Hydrodynamic parameters such as hold up, flooding velocity and mean drop size were studied together with the effect of chemical reaction on increasing mass transfer performance. Finally, the mass transfer and axial mixing coefficients were obtained from the optimization of data by ADM. It was found that at the pulsation intensity from 0.003 to 0.007 m/s, the maximum mass transfer and minimum axial mixing occurred and it can be concluded that pulsation improves the efficiency of mass transfer just at low intensities.     

MASS TRANSFER INTO A FREE LIQUID SURFACE EFFECTED BY SUBMERGED JETS

A theoretical and experimental analysis of mass transfer into a turbulent free liquid surface effected by submerged jets has been presented. Theoretical considerations concentrated on hydrodynamic characteristics of the system which enabled us to derive the radial velocity distribution in the surface jet flow. Some conclusions have been drawn from the two-parameter models of turbulence. The results of experimental measurements of the average mass transfer coefficients have been interpreted in terms of our own model of mass transfer accounting for eddy diffusivity. The model parameters were correlated with the basic hydrodynamic parameters of the system. Radial distributions of the local values of the mass transfer coefficients were estimated. The applicability of other models of mass transfer has also been verified. It has been shown that the model presented here is the most general and applicable for interpretation of the experimental data obtained when studying the system under consideration     

新型转盘萃取塔研究开发与工业应用

采用激光多普勒测速仪(LDV)和计算流体力学(CFD)软件,对转盘萃取塔(RDC)内的单相流流场进行了测量和模拟。发现塔内存在沟流和级间的旋涡流动,级间返混严重,为此发明了一种装有级间转动挡板的新型转盘萃取塔(NRDC)。NRDC与传统的RDC的区别在于安装了设计独特的转动挡板。这些转动挡板安装在2个转盘之间,固定在转动轴上,并与固定环处于同一水平面。LDV测量和CFD模拟结果发现,NRDC可有效抑制沟流和级间旋涡流动。传质实验和流体力学表明,NRDC的传质效率比RDC高20%—40%,而液泛速度大致相当。成功地将NRDC用于引进RDC的扩能改造和新塔的设计中。     

Mass transfer characteristics in a rotating packed bed with split packing

The rotating packed bed (RPB) with split packing is a novel gas–liquid contactor, which intensifies the mass transfer processes controlled by gas-side resistance. To assess its efficacy, the mass transfer characteristics with adjacent rings in counter-rotation and co-rotation modes in a split packing RPB were studied experimentally. The physical absorption system NH3–H2O was used for characterizing the gas volumetric mass transfer coeffi-cient (kyae) and the effective interfacial area (ae) was determined by chemical absorption in the CO2–NaOH sys-tem. The variation in kyae and ae with the operating conditions is also investigated. The experimental results indicated that kyae and ae for counter-rotation of the adjacent packing rings in the split packing RPB were higher than those for co-rotation, and both counter-rotation and co-rotation of the split packing RPB were superior over conventional RPBs under the similar operating conditions.     

Investigations on hydrodynamics and mass transfer in gas–liquid stirred reactor using computational fluid dynamics

In this work, the hydrodynamics and mass transfer in a gas–liquid dual turbine stirred tank reactor are investigated using multiphase computational fluid dynamics coupled with population balance method (CFD–PBM). A steady state method of multiple frame of reference (MFR) approach is used to model the impeller and tank regions. The population balance for bubbles is considered using both homogeneous and inhomogeneous polydispersed flow (MUSIG) equations to account for bubble size distribution due to breakup and coalescence of bubbles. The gas–liquid mass transfer is implemented simultaneously along with the hydrodynamic simulation and the mass transfer coefficient is obtained theoretically using the equation based on the various approaches like penetration theory, slip velocity, eddy cell model and rigid based model. The CFD model predictions of local hydrodynamic parameters such as gas holdup, Sauter mean bubble diameter and interfacial area as well as averaged quantities of hydrodynamic and mass transfer parameters for different mass transfer theoretical models are compared with the reported experimental data of [Alves et al., 2002a] and [Alves et al., 2002b] . The predicted hydrodynamic and mass transfer parameters are in reasonable agreement with the experimental data.