新型复合填料塔的传质性能研究

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。     

QH—1新型填料萃取塔轴向混合和传质性能研究

针对润滑油精制等实际应用的特点，选用低界面张力的正丁醇－丁二酸－水体系，在φ１００ｍｍ的填料萃取柱中对国外引进的两种新型填料和我校新开发的ＱＨ－１型填料的萃取性能进行了比较。结果表明，ＱＨ－１型填料的传质效率最高，轴向返混最小。     

新型板网填料传质性能的研究

在５００ｍ ｍ 冷模实验塔内对２５０ Ｙ 型填料进行氧解吸试验,结果表明三层板网复合填料的分离效率明显高于单层板网填料,尤其在液气比低的工况下,效率可以倍增,和广泛应用的金属 Ｍｅｌｌａｐａｃ填料相比,板网复合填料的分离效率能高３０％ 左右。     

板波填料萃取塔的实验研究(Ⅱ)传质性能

本文应用扩散模型并采用最优化方法拟合实测的稳态浓度剖面,在内径40mm、100mm的板波填料萃取塔中,用30%TBP(煤油)-醋酸-水和正丁醇-丁二酸-水两种体系研究了板波填料萃取塔的传质性能.     

规整填料在加压精馏中的传质性能

高压精馏是现代过程工业中十分重要的分离过程 ,例如炼油工业中轻烃的分离 ,石油化工中乙烯、丙烯等低碳烃类的分离 ,都是经过高压精馏完成的 .高压精馏效率一般较在常压下有所降低 ,其中填料塔较板式塔下降更明显 ,故通常认为采用板式塔比较好 .但规整填料由于其大通量、低压降等优点 ,已经开始涉及高压领域 ,因此对规整填料在高压下的性能需进行测定和研究 .目前 ,对规整填料在高压下传质性能的研究 ,国外ＦＲＩ[1] 近年已开始进行 ,但其实验数据较少 ,在国内目前还属空白 .本文在国家重点精馏分离实验室高压热模精馏实验塔上进行了一系列…     

超临界流体填料萃取塔流体力学和传质性能(Ⅱ) 传质性能

根据双膜理论,建立了超临界流体填料萃取塔液相总体积传质系数关联式;依据柱塞流模型,应用超临界二氧化碳-异丙醇-水和超临界二氧化碳-乙醇-水2种实验体系在内径为25mm的塔内对金属板波和金属丝网θ环2种填料的传质性能进行了模拟计算。结果表明,本文提出的传质数学模型能较好地描述超临界流体填料萃取塔的传质性能。     

现代填料塔技术（四）填料塔的流体力学和传质（下）

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。     

新型金属格栅填料的流体力学及传质性能研究

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。     

Experimental study of hydromechanics and mass transfer characteristics in cross flow packed tower

The functions of hydromechanics and volumetric mass transfer coefficient K_Xa of cross flow packed tower were studied by setting baffle plates. The influence of plate spacing on the pressure drop, height of the mass transfer unit, and mass transfer characteristics were investigated in an ordinary packed tower and a cross flow packed tower. The pressure drop increased with a rise in the flow rate of gas and liquid, and an excessive pressure drop caused flooding in the cross flow packed tower. The height of the mass transfer unit increased with a decrease in the gas flow when H/D = 0.8 ? 1.2, while increased with the increase of the gas flow when H/D = 0.6. In the ordinary packed tower and the cross flow packed tower, K_Xa increased with a rise of liquid flow. The influence of gas flow on K_Xa was negligible in the ordinary packed tower, however, in the cross flow packed tower the K_Xa gradually increased with a rise in the gas flow rate. The effect of mass transfer was optimal at H/D = 0.8. In addition, using STATISTICA software, the corresponding K_Xa correlations were proposed and discussed.     

Experimental researches on mass and heat transfer in new typical cross-flow rotating packed bed

New typical cross-flow Rotating Packed Bed(RPB)called multi-pulverizing RPB was manufactured.There is enough void in multi-pulverizing RPB,where liquid easily flows and is repeatedly pulverized by light packing,which decreases the material consumed,lightens the weight,and compacts the structure.Mass and heat transfer property in the new type PRB were studied by two experimental models.In the mass transfer model,the axial fan pumping gas press is only 100 Pa,mass transfer coefficient and volumetric mass transfer coefficient are similar to countercurrent RPB,which are an order quantity lager than that in the conventional packed tower.In the heat transfer experiment,the axial fan pumping gas press is only 120 Pa;volumetric heatwhich especially suits the treatment of large gas flow and lower gas pressure drop.     

Hydrodynamics and mass transfer in a pulsed packed column

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. H_oxp and H_ox 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, H_oxand H_oxd were proposed and good agreement between calculated and experimental data was obtained.     

填料塔气液传质参数研究（Ⅱ）──气膜传质系数

用拟一级快速化学反应吸收法测定了拉西环填料塔的气膜传质系数，并得出其无因次表达式。     

错流填料吸收塔吸收率的测定

填料塔是一种常用的气液传质设备,通过对传统填料塔内气液二相流动行为的研究,提出了一种带折流挡板的新型填料塔——错流填料塔。实验表明,错流填料塔能更好地消除壁流,改善气液二相的接触状况;错流填料塔的吸收率明显大于普通填料塔,在气液二相流量一定时,吸收率随着H/D(板间距与塔径之比)的减小而逐渐增大,当H/D=0.8时,吸收率最大;当H/D<0.8时,随着气量的增加,吸收率逐渐减小,仅在小气速下,吸收率较大,在气速较大时,由于压降过大,导致吸收操作无法正常进行。     

分形理论分析填料塔内件的发展

综述了乱堆填料、规整填料和气液分布装置的发展概况,应用分形理论分析填料的几何结构对气液传质的影响,并提出了今后填料塔研究的方向.     

Dynamics of droplets and mass transfer in a rotating packed bed

To do further research on the mass‐transfer mechanism in rotating packed bed (RPB), dynamics of droplets in a RPB are studied by an analytical approach combined with a series of laboratory measurements. Based on the results of the fluid dynamics, mathematical models of mass‐transfer coefficient and mass‐transfer process in RPB are proposed, respectively. Mass‐transfer experiments in RPB are also carried out using ethanol–water solution. By comparison, the results of simulation agree well with that of the experiment, which demonstrate that both hydrodynamic model and mass‐transfer models can better describe the real conditions of RPB. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2705–2723, 2014     

A three-zone mass transfer model for a rotating packed bed

A rotating packed bed (RPB) is recognized for its merits in chemical process intensification. In most studies of RPB mass transfer modeling, however, the effects of the end and cavity zones have not been taken into consideration, since it was very difficult to distinguish the end and bulk zones by hydrodynamics and mass transfer process. In this work, the radial thickness of the end zone was obtained by developing a probability method and imaging experiments to separate the end and bulk zones. A three-zone model, including end, bulk, and cavity zones, of the overall gas-side volumetric mass transfer coefficient (K_Ga)t was first established. Experiments of dissolved MEA chemisorption of CO₂ were carried out to validate the proposed three-zone mass transfer model. The results of the MEA-CO₂ absorption experiments showed that the experimentally obtained values of CO₂ absorption efficiency were in agreement within ±20% with the model predictions.     

Experimental study of the mass transfer behavior of carbon dioxide absorption into ternary phase change solution in a packed tower

Phase change absorbents for CO₂ are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process. Compared with other phase change absorbents, monoethanolamine (MEA)-sulfolane-water is inexpensive and has a fast absorption rate. It is one of the most promising solvents for large-scale industrial applications. Therefore, this study investigates the mass transfer performance of this phase change system in the process of CO₂ absorption in a packed tower. By comparing the phase change absorbent and the ordinary absorbent, it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration. In the 4 mol·L^-1 MEA/5 mol·L^-1 sulfolane system, the CO₂ loading of the upper liquid phase after phase separation is almost zero, while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent, which greatly reduces the energy consumption. This study also investigates the influence of operating parameters such as lean CO₂ loading, gas and liquid flow rates, CO₂ partial pressure, and temperature on the volumetric mass transfer coefficient (K_Ga_V). The research shows that K_Ga_V increases with increasing liquid flow rate and decreases with the increase of lean CO₂ loading and CO₂ partial pressure, while the inert gas flow rate and temperature have little effect on K_Ga_V. In addition, based on the principle of phase change absorption, a predictive equation for the K_Ga_V of MEA-sulfolane in the packed tower was established. The K_Ga_V obtained from the experiment is consistent with the model prediction, and the absolute average deviation (AAD) is 7.8%.     

密封式错流旋转填料床气膜控制传质过程研究

在密封式错流旋转填料床中,利用浓度为0.926 mol/L的NaOH溶液吸收空气中体积分数为0.5%—1%的CO2气体,对气膜控制过程传质性能进行了研究。实验表明:密封式错流旋转填料床CO2的吸收率随气体流量的增大而减小,在低转速下随旋转填料床的转速增大气体吸收率上升较快,高转速时影响变小;转速大于1 000 r/min情况下,CO2的吸收率随液量的增大而上升,转速小于1 000 r/min情况下,CO2的吸收率随液量增大而变小。建立了密封式错流旋转填料床气膜控制过程的气体吸收模型,经验证实验结果与模型计算结果吻合较好。