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。     

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.     

表面改性塑料填料流体力学及传质性能研究

采用新的塑料波纹填料改性方法,有效改善填料成膜性,与同等条件下商业填料进行对比。采用氧解析实验,在直径190 mm的有机玻璃塔内,液相喷淋密度10—36 m3/(m2·h),F因子0.2—3(m/s)·(kg/m3)0.5的实验条件下测定了改性填料及商用填料的流体力学及传质性能。实验结果表明:当液体喷淋密度为10,24,36 m3/(m2·h)时,在相同的F因子下,改性填料的液相传质单元高度Ho L较商用填料分别降低了29.50%,23.00%以及23.95%,同时改性后压降也相应为商用填料的85.37%,89.71%和88.35%。表明该改性方法在低喷淋密度下对塑料填料性能提升显著。此外,对实验填料的Ho L、压降进行了关联,采用狭通道液膜波动理论对填料塔内部液泛进行了探讨,为塑料填料的工业应用提供了设计基础。     

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.     

共轭环填料性能研究及测试方法改进[摘]

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,全面论述了共轭环的结构特点。用φ38塑料共轭环、鲍尔环、一阶梯环做对比实验结果:共辘环每米压强降比阶梯环低40~45%,比鲍尔环低50~55%;共辘环的传质单元高度比阶梯环低15%,比鲍尔环低     

新型塔填料共轭环的性能研究及液膜传质单元高度关联式

研究新型填料共轭环的流体力学和传质性能，并归纳出一个传质单元高度关联式，其计算值与实验值吻合。     

金属压延孔环填料的性能研究

用金属压延孔环(θ环)与瓷质拉西环填料作如下比较实验:填料的特性参数、干压降、各种喷淋密度下的压降和泛点、体积传质系数、传质单元高度。证实θ环的液体阻力明显比拉西环小,θ环尤适用于真空蒸馏,在大液体量的吸收操作时,θ环较有利。     

两种新型填料的性能测试与评价

介绍目前两种新型填料环矩鞍及共轭环。在φ３００ｍｍ的试验塔中测定了它们的流体力学性能数据和传质数据,对实验结果对比分析表明;环矩鞍的流体力学性能优于共轭环,但共轭环的传质性能优于环矩鞍。     

旋转填料床中2种填料压降和传质特性的对比

分别以空气-水和磷酸钠溶液吸收模拟烟气中SO2为实验体系,对装填有θ环和波纹丝网填料的逆流旋转填料床压降和传质特性进行了对比研究,结果表明:在实验操作范围内,逆流旋转填料床的湿床压降随气量、超重力因子的增大而增大,受液量的影响很小;2种填料的湿床压降相差不大,且均低于750 Pa。2种填料的Kya均随喷淋密度、空床气速和超重力因子的增加而增大,当U=6 m3/(m2·h),u=0.73 m/s,β=85及更高的操作范围时,θ环填料的Kya比波纹丝填料高25%以上,说明θ环填料的传质性能明显优于波纹丝填料;最后得到装填θ环和波纹丝填料的旋转床湿床压降和体积传质系数的经验关联式。文中的研究结果对旋转填料床的设计和选型有重要意义。     

改性塑料规整填料的流体力学和传质性能研究

主要研究了不同比表面积和开孔率塑料规整填料表面处理前后的流体力学和传质性能。结果表明：经过表面改性后,传质性能可提高约20%～35%,开孔填料经表面改性后阻力不会增加,并且在低喷淋密度时传质效率提高显著。     

翅片导流板填料应用于旋转填料床的特性

For an alcohol/water system and with fin baffle packing, continuous distillation experiments were carried out in a rotating packed bed (RPB) system at atmospheric pressure. The effects of the average high gravity factor (β), liquid reflux ratio (R) and feedstock flux (F) on the momentum transfer and mass transfer were investigated. The gas phase pressure drop of RPB increased with the average high gravity factor, liquid reflux ratio and feedstock flux, which was 13.55-64.37 Pa at β of 2.01-51.49, R of 1.0-2.5, and F of 8-24 L&;#8226;h－1 for a theoretical tray in the RPB with fin baffle packing. The investigation on the mass transfer in the RPB with different packings showed that the number of transfer units of RPB with a packing also increased with the average high gravity factor, reflux ratio and feedstock flux. It is found that the fin baffle packing (packing III) presents the best mass transfer performance and lowest pressure drop for the height equivalent to a theoretical plate (HETP), which is 6.59-9.84 mm.     

用可视化方法实验研究规整填料的局部传质(英文)

A chromochemical reactive mass transfer technique has been employed to study local mass transfer characteristics of structured packing. This technology adopted by experiment is an Ammonia Adsorption Method (AAM) that yields the surface distribution of transferred mass by analyzing the color distribution on a filter paper with the results of the color chemical reaction. A digital image processing technology is applied for data visualiza-tion. The three-dimensional plot of the local mass transfer coefficients shows that there exist three peak values on different positions of a unit cell of structured packing. In order to improve mass transfer efficiency of the structured packing, one piece of baffle is added between packing sheets. As a result, the average mass transfer coefficient in-creases by (10-20)% and the pressure drop decreases by (15-55)%.     

气-液-液萃取传质效率的研究

在液-液萃取过程中,提高分散相的表面更新速率可有效提高萃取的传质效率.研究发现,在萃取过程中使用气体搅拌可以增加液液之间的接触面积,促进液相内的湍动和循环.据此,本文在气-液-液萃取条件下对不同填料的传质性能进行了测定.实验表明,通入气相后分散相液滴呈现稳定的“油包气”空心状态,这种结构大大降低了分散相液滴的传质层厚度,减小了传质距离,极大地强化传质效率.在适宜气速下,气-液-液萃取效率较传统萃取效率提高20％～40％.通过与散装填料对比,发现规整填料更利于强化萃取效果,传质效率提高约50％.     

CFD Study on the Local Mass Transfer Efficiency in the Gas Phase of Structured Packing

Visualization of local mass transfer coefficients over the dry surface of corrugated‐sheet structured packing is essential for optimizing the existing geometry of structured packing and for improving mass transfer efficiency to develop new structured packing. The local flow patterns between packing sheets and the gas‐phase mass transfer coefficient at each point over the surface are illustrated by employing a wall‐surface reaction model. Different turbulence models are utilized, i.e., a standard κ‐? model and three different low‐Re‐κ‐? models. The numerical calculation results with the Lam‐Bremhorst low‐Re‐κ‐? turbulence model is found to agree well with experimental data. There are three similar regions with enhanced mass transfer efficiency in each mass transfer unit cell of structured packing.     

小波纹齿角梯形规整填料实验研究

规整填料在过程工业中得到广泛的应用,但近年来性能改进不大,因此它的强化研究具有重要意义。文中在1套全自动的50 mm内径的精馏塔内,用乙醇-正丙醇体系对小波纹齿角梯形规整填料的流体力学和传质性能进行了研究,并与相同比表面积的Mellapak填料进行了比较。实验表明,小波纹齿角梯形规整填料单位床层压降可减小30%,同时传质效率提高了16%。小齿角梯形规整填料综合性能优良,是一种有广泛应用前景的新型波纹规整填料。     

Mass transfer in structured corrugated packing

The performance of structured corrugated packing has been simulated by establishing mechanistic models for liquid distribution, liquid flow on the packing surface and mass transfer. The models were used to investigate the effect of packing height, liquid load, initial maldistribution as well as differing initial distribution and solid-liquid contact angle on the packed column performance. Wetted surface area is the primary value of interest and the simulated results compare very well with those predicted by Onda (1968). The results clearly demonstrate that the wetted surface area is a strong function of the solid-liquid contact angle. Other predicted values such as mass transfer coefficients and overall height of a transfer unit show reasonable agreement with published data.     

填料特性对鼓泡填料萃取塔性能影响

填料的结构与表面性能对鼓泡填料萃取塔性能有直接影响。利用空气 煤油 (苯甲酸 ) 水体系 ,测定了未装填料和分别装填板波填料、丝网填料、压延孔环填料的鼓泡萃取塔水力学性能和传质性能。实验表明 ,对未装填料和装有填料的萃取塔 ,气相搅拌都可以显著提高液液两相的接触与传质性能 ;液泛速度随表观气速的增大而下降 ;流道设计合理的规整填料传质性能明显高于散装填料 ;表面光滑的填料分散相滞存率低 ,因而液泛速度较高 ;填料的作用有利于降低轴向返混 ,明显提高萃取塔传质性能。     

中空纤维透析器中纤维管填充密度对传质影响的数值模拟

通过数值模拟研究了纤维管填充密度（27.18%～67.11%）增加时传质系数的变化趋势,同时考察了流体速度对传质系数的影响.模拟结果表明：随着填充密度的增加,传质系数先增加后下降;流体速度不仅影响传质系数的大小（速度越大,传质系数越大）,也影响最佳填充密度（传质系数最大值对应的填充密度）的大小（速度增大,最佳填充密度也增大）.模拟结果可为透析器的优化设计提供参考.     

金属丝网波纹填料表面处理对其性能的影响

对金属丝网波纹填料采用不同的方法进行表面处理 ,并以乙醇 水为物系 ,对处理前后填料层的压降△P/Z及等板高度HETP进行了测定。研究了金属丝网波纹填料表面处理对其流体力学及传质性能的影响。研究结果表明 ,金属丝网波纹填料经表面处理后 ,其流体力学性能无明显变化 ,传质性能在回流比R =1下 ,提高了 11% ,在回流比R =5下 ,提高了 8%。由此可见 ,在低液体负荷下 ,金属丝网波纹填料的表面处理更具有优越性。