共查询到18条相似文献,搜索用时 46 毫秒
1.
引言填料塔中液相混合行为对传质有显著影响.关于散堆填料塔中液相轴向混合行为已有许多实验数据和一些模型发表,文献中对散堆填料塔径向混合行为也有一些研究.但对目前工业广泛使用的板波纹规整填料塔中的液相混合行为尚未见文献报道.为了解决板波纹填料塔中各种单元操作的合理设计,本文对此进行了研究.1实验本文用脉冲示踪法研究规整填料塔中液体的混合行为.实验在直径0.3m的填料塔中进行,塔体总高为7m,填料装填高度为1.4m.塔顶液体分布器为单层排管式分布器,共开有25个Φ3.5mm的喷淋孔.用水-空气系统及Mellapak250Y型填料… 相似文献
2.
3.
加压下板波纹规整填料塔中液相混合行为 总被引:2,自引:0,他引:2
采用脉冲示踪法测量了在0.3MPa、0.5MPa和0.6MPa压力下以及在一系列液速和气速下250Y型孔板波纹规整填料内液相的混合行为。应用时域最小二乘法由实验数据得到了液相的轴向返混系数和轴向有效流速等参数,并以y=aReL^e10^cReG10^dp的形式对轴向Peclet准数进行了关联。本研究补充了目前缺乏的加压操作下规整填料液相混合行为的数据。 相似文献
4.
新型规整填料在脱硫塔中的应用研究 总被引:1,自引:0,他引:1
本文论述了用氨水进行催化脱硫的传质和反应机理。分析了在脱硫塔中应用高效规整填料所具有的技术优势,以及在改造设计中应注意的问题。应用效果表明,采用高效填料塔技术是合成氨装置扩大能力、提高原料气质量、降低成本的重要措施。 相似文献
5.
6.
讨论了规整填料在解吸塔结构设计中存在的问题,并根据实际情况提出了流体分布器及塔体高度的改进措施 。 相似文献
7.
叙述了铜洗塔中铜氨液吸收合成气中少量CO,CO2的反应机理和传质机理,介绍了规整填料的结构特点以及所需配套进行的铜洗塔内件改造和铜液过滤器改造。实际应用表明:使用规整填料改造铜洗塔可优化工艺操作。提高设备技术。投资回报快,节能降耗效果显著。 相似文献
8.
规整填料的气液分布器 总被引:4,自引:0,他引:4
讨论了液体分布不均对填料分离性能的影响,并全面介绍规整填料的气液分布器的有关结构和计算(包括若干新型的分布器),可供设计和企业进行规整填料设计时参考,以确保填料塔正常操作。 相似文献
9.
1 前言 填料塔是十分重要的分离设备。近年来,一些大的化工企业已先后引进了新型规整填料,并初见成效。许多单位相继进行技术改造也取得了事半功倍的实效。现将几种规整填料的性能以及工业应用的情况介绍一下,以便更好地推广应用。2 填料的种类及工业应用2.1 新型垂直筛板(New VST) 相似文献
10.
11.
加压下填料塔中液相轴向反混的研究 总被引:2,自引:0,他引:2
Liquid phase axial mixing was measured with the tracer technique in a packed column with inner diameter of 0.15m,in which the structured packing,Mellapak 350Y,was installed.Tap water as the liquid phase flowed down through the column and stagnant gas was at elevated pressure ranging from atmospheric to 2.0MPa.The model parameters of Bo andθwere estimated with the least square method in the time domain.As liquid flow rate was increased,the liquid axial mixing decreased.under our experimental conditions,the effect of pressure on Bo number on single liquid phase was negligible,and eddy diffusion was believed to be the primary cause of axial mixing in liquid phase. 相似文献
12.
Abstract Hindered diffusion of proteins in a porous packing plays an important role in proteinchromatographic purification.The HETP method was adopted to analyze the influence of axialdispersion, film mass transfer and hindered diffosion in the porous packing employing a size-exclusionchromatography(SEC)process.The retention behavior with eight proteins of different relativemolecular mass was experimentally detected with a commercial SEC column.A correlation basedon the relative molecular mass of the proteins and the packing porosity was developed and used topredict the effective diffusion coefficient of a protein in the Porous packing.The predicted valuesof effective diffusion coefficient were very consistent with the experimental results with the averageerror of 8.6%. 相似文献
13.
14.
Yuejin Yuan Libin Tan Zhe Zhao Yingying Xu Yu Zhao Yueding Yuan 《Drying Technology》2016,34(14):1664-1676
ABSTRACTAiming at the problem of multilayer physical structure for the skeleton of porous media, a multiscale and multilayer structural model of heat and mass transfer processes for drying of grain packing porous media was established by applying the pore network method and multiscale theory. An experimental study on rice drying was conducted in order to validate this model. The simulation and experimental results indicated that the established model could explain the mechanical properties of rice drying well. The rate of heat transfer was faster than the rate of mass transfer and there was a higher moisture gradient inside the rice grain. The diffusion coefficient of rice embryo played an important role in the drying process, and whose effect on drying was larger than the diffusion coefficient of rice hull and chaff. The moisture was imprisoned effectively inside the rice when the diffusion coefficient of rice embryo was very small. 相似文献
15.
在一具有四室的气-液-固三相多室气升式环流反应器(MALR)中,利用电导脉冲示踪技术研究了空气-水及不同浓度的乙醇水溶液-聚苯乙烯三相物系在MALR中的混合特性(混合时间和波登斯坦准数与两个上升室的表观气速和不同体积浓度的乙醇水溶液间的关系)。实验结果表明,两上升室的表观气速和乙醇溶液的浓度对器内的轴向分散和混合均有影响,但MALR的返混程度是比较小的。 相似文献
16.
An estimation procedure of surface diffusion coefficient, Ds, in liquid phase adsorption was proposed. The procedure is based on a restricted diffusion model, in which Ds is correlated with molecular diffusivity by considering a restriction energy due to an adsorptive interaction between adsorbates and adsorbents. In some adsorption systems, Ds of different adsorbates could be calculated with an error less than about 50% from only one datum of each adsorption equilibrium constant. Irrespective of temperature, the procedure, can be applied for the estimation of Ds even in a wide range of Ds of about 4 orders of magnitude. 相似文献
17.
用简化三维混合池模型对Gorak所做精馏实验作了实例计算。模型的计算结果与Gorak实验数据符合良好,以简化三维混合池模型为工具,用数值计算的方法研究了规整填料塔中液体流动分布和混合对精馏过程的影响。结果表明:液相轴向返混对精馏有着显著的不利影响;当液体流动分布为严重壁流分布(严重沟流分布)时,必须用三维模型描述才不会产生较大偏差;横向混合系数的增大有利于填料塔分离效率的提高,但不能完全抵消液相严重不均匀分布对精馏过程的不利影响。 相似文献