新型导向筛板的研究

在φ600 mm的有机玻璃冷膜实验装置上,用水-空气体系对孔径为8 mm的新型导向筛板的流体力学性能进行了实验研究,测定了不同条件下的塔板压降、漏液量和雾沫夹带量等流体力学参数,对实验数据进行了关联,得出计算塔板压降、漏液、雾沫夹带的公式,可供导向筛板设计与研究使用.     

导向固定阀型塔板上气液流体力学性能的研究

主要介绍了一种新型塔板--导向固定阀型塔板,研究了其压降、漏液、雾沫夹带等流体力学性能,与作者开发的高效导向筛板的相关性能进行了比较.对流体力学实验数据进行关联,获得了计算塔板压降、雾沫夹带和泄漏点孔速的关联式,可供梯形导向浮阀塔板设计计算之用.     

导向筛板的流体力学性能

对导向筛板的流体力学性能进行了实验研究。 本文着重介绍导向筛板的压强降、雾沫夹带和漏液点的实验结果,并提出可供设计使用的关联式和图表。关联结果与普通筛板进行了比较并提出一些修正和补充建议。同时介绍清液高度和泡沫高度的实验结果和关联式。     

CTST-MD复合型塔板降液管流体力学性能的实验研究

结合立体传质塔板(CTST)和悬挂式降液管各自的优势,在CTST塔板的基础上组合悬挂式降液管。以此为实验塔板,在直径为570 mm的有机玻璃塔中以空气-水为实验物料进行冷漠实验,对此种塔板的板压降、降液管的液层高度、液流孔孔流系数等流体力学性能进行了实验研究,并与鼓泡型塔板进行了对比。结果表明,复合型立体传质塔板的板压降低于弓形降液管的CTST和悬挂式降液管的筛板(MD筛板)。在高液相负荷下,复合立体传质塔板降液管液层高度远低于MD筛板,具有更大的液体处理能力。悬挂式降液管液流孔的孔流系数主要与开孔的水力半径有关,受开孔率影响较小。得到了复合立体传质塔板降液管几种孔型的孔流系数值。     

汽-液-液三相蒸馏导向筛板的流体力学性能研究

本文以空气—水—煤油为介质,在600×l50矩形冷模塔内进行了气—液—液三相蒸馏导向筛板的流体力学特性的研究.实验就三相蒸馏塔板上的操作工况(Operating Regimes)及塔板上两液相混合状况进行了研究.并就清液高度、雾沫夹带、板压降等主要流体力学参数进行了大量测试,提出适用于混合工况的主要流体力学参数计算关联式.     

导向筛板-导向浮阀塔板流体力学及传质性能

设计了一种高分离效率、高操作弹性的新型导向筛板-导向浮阀塔板(FGS-VT)。并在直径为600 mm的有机玻璃塔内,以空气-水-氧气为物系,测定了3种结构不同的FGS-VT的流体力学性能和传质性能,包括干板压降、湿板压降、漏液量、雾沫夹带率和塔板效率等。通过与筛孔、导向孔大小和排布方式相当的导向筛板在相同条件下的实验数据对比得出结论,带有14个浮阀的导向筛板-导向浮阀(FGS-VT-14-8)具有更低的干板压降和湿板压降,更大的操作弹性(更低的漏液和雾沫夹带)和更高的塔板效率。     

导向孔与筛孔和导向浮阀复合塔板的实验研究

设计了导向孔-导向浮阀复合塔板和筛孔-导向浮阀复合塔板,在板间距为600 mm,液流强度为20 m~3/(m·h),1 500 mm×450 mm的矩形塔内,以空气-水系统测试了3种塔板的干板压降,湿板压降,雾沫夹带率,漏液率,清液层高度,泡沫层高度水力学性能。由实验数据分别拟合了3种塔板干板压降,湿板压降,雾沫夹带率,漏液率的关联公式。实验表明:筛孔-导向浮阀复合塔板在压降和漏液率方面优于导向浮阀塔板;导向孔-导向浮阀复合塔板在水力学方面都优于导向浮阀塔板,是一种操作弹性大,具有更好水力学性能的优良塔板;选择合适的塔内件复合也是改善塔板性能的关键。     

高负荷导向垂直栅板的研究(Ⅰ)——实验测定及关联

本文提出了一高负荷帽罩单元(H型),在φ600实验塔中采用水-空气系统对其流体力学性能进行研究。实验测定了各种几何尺寸及流体力学条件对塔板压降、雾沫夹带量、清液层高度和漏液点气速等的影响,并加以讨论,得出了一些能用于设计计算的半经验方程式和曲线图。     

一种新型的喷射鼓泡传质设备:泡罩立体筛板

介绍了泡罩立体筛板的结构特点和实验情况,采用空气-水物系在1 000 mm×400 mm的有机玻璃塔中进行了塔板压降、雾沫夹带和漏液量的流体力学性能研究,并与垂直筛板的流体力学性能进行对比,结果表明,泡罩立体筛板的流体力学性能优于垂直筛板。     

混合箱塔板流体力学性能实验研究

研究开发了一种大通量高效率的混合箱塔板 ,它的非传质区仅占塔截面积的 5 %左右 ,在塔板上设计了用于提高气液传质效率的混合箱结构。在冷模试验塔内对混合箱塔板的压降、漏液、雾沫夹带以及降液管清液层高度等流体力学性能进行了试验 ,试验表明该塔板的漏液和雾沫夹带都比传统筛板有所减少 ,且通量大幅度提高     

Nye Tray Versus Sieve Tray: Experimental Study on Hydrodynamic Parameters

The hydrodynamic parameters of a Nye tray were investigated by performing experiments in a tower with a diameter of 1.22 m. Air was used as the gas phase and water was used as the liquid phase. A number of parameters such as the dry pressure drop, the total pressure drop, the clear liquid height, the froth height, and the entrainment were measured. A tray stability factor was obtained using the amount of weeping, the clear liquid height, the dry pressure drop, and the Froude number. All experiments were repeated for the matching sieve tray under the same conditions. Ultimately, advantages and disadvantages were compared, and the results demonstrated that the Nye tray has a couple of advantages over the sieve tray, except that the sieve tray is slightly more stable.     

新型固定阀塔板的流体力学和传质性能研究

提供了一种阀盖两侧具有向下弯曲折边的新型固定阀。在内径为500mm的有机玻璃塔内,以空气水为物系,研究了其流体力学性能;在内径为300mm的不锈钢塔内,以乙醇水为物系,常压全回流情况下,研究了其传质性能。研究结果表明:新型固定阀塔板的板压降略高于筛孔塔板,比F1 浮阀塔板小得多,雾沫夹带量小,雾沫夹带液泛点阀(筛)孔动能因子均比筛孔塔板、F1 浮阀塔板大,漏液量较小,漏液点阀(筛)孔动能因子比筛孔塔板低,比F1 浮阀塔板高,传质效率与F1 浮阀塔板相当。     

复合塔板的流体力学特性(Ⅱ) 操作变量和液体物性对塔板流体力学特性的影响

在前文工作的基础上进一步研究了同时具备大孔径和高开孔率条件的复合塔板 ,研究了操作变量和流体的物理性质对该复合塔板流体力学性能的影响 .结果表明 :液体的密度增加 ,塔板压降增加 ,漏液量增加 ;黏度增加 ,塔板压降降低 ;表面张力减小 ,漏液点速度上升 ,雾沫夹带增大 ,液泛速度下降.     

Hydrodynamic Characteristics in the Counter‐Flow Total Spray Tray

The capacity of a column is limited by the distribution of gas and liquid, especially in case of large‐diameter cross‐flow trays. In order to solve the bottleneck, a new counter‐flow tray named total spray tray (TST) was put forward. Taking air/water as medium, the hydrodynamic behavior, including the pressure drop, weeping, entrainment, and clear liquid height, was investigated, in comparison with the CTST, which had a higher capacity. Based on experimental data, the correlations of the TST pressure drop were established by regression analysis method. The experimental results show that the TST has a lower wet pressure drop and less weeping. More interestingly, its clear liquid height can be self‐adjusting with the variation of the gas kinetic energy factor, which is beneficial to improving the capacity.     

CFD and experimental studies of liquid weeping in the circular sieve tray columns

Sieve trays are widely used in fractionating devices like tray distillation towers existing in separation and purification industries. The weeping phenomenon that has a critical effect on the efficiency of tray towers was studied by a numerical model and some experiments. The experiments were carried out in a pilot scale column with the diameter of 1.22 m that includes two test trays and two chimney trays. Weeping rates and some hydraulic parameters were measured in sieve trays with the hole area of 7.04%. Furthermore, the total weeping rate and weeping rate in inlet and outlet halves of the test tray were determined. It was also used an Eulerian–Eulerian computational fluid dynamics (CFD) method for the present study. The model was able to predict the dry tray pressure drop, total pressure drop, clear liquid height, froth height, and weeping rate simultaneously. Furthermore, the obtained CFD results were in a good agreement with the experimental data in terms of pressure drop and the model properly predicted several hydraulic parameters like the liquid weeping behavior along the tray.     

HYDRAULICS AND EFFICIENCY OF SCREEN TRAYS FOR DISTILLATION

Screen trays are proprietary devices similar to sieve trays which are used in distillation and absorption applications. The pressure drop, liquid holdup and entrainment are measured for screen trays in an air/water column and compared to results obtained with sieve trays. The effciencies of both types of trays were compared in a distillation column using systems of various physical properties (methanol/water, acetic acid/water and cyclohexane/n-heptane mixtures). It was found that the screen tray has a lower dry pressure drop, higher liquid holdup, lower entrainment and weeping, and higher jet flooding capacity than the sieve tray. However, the effciencies of both trays are similar for the systems studied. A model was developed for predicting total pressure drop for screen trays using an air/water column. The model was tested using results for methanol/water, cyclohexane/n-heptane and acetic acid/water systems at total reflux. The deviations are within +/- 20% for 90% of the data points. The effect of a bed of mesh packing on the screen tray was also studied. It was found that the packing led to a higher tray effciency, but resulted in a higher tray pressure drop.     

Hydraulics and efficiency of screen trays for distillation

Screen trays are proprietary devices similar to sieve trays which are used in distillation and absorption applications. The pressure drop, liquid holdup and entrainment are measured for screen trays in an air/water column and compared to results obtained with sieve trays. The effciencies of both types of trays were compared in a distillation column using systems of various physical properties (methanol/water, acetic acid/water and cyclohexane/n-heptane mixtures). It was found that the screen tray has a lower dry pressure drop, higher liquid holdup, lower entrainment and weeping, and higher jet flooding capacity than the sieve tray. However, the effciencies of both trays are similar for the systems studied. A model was developed for predicting total pressure drop for screen trays using an air/water column. The model was tested using results for methanol/water, cyclohexane/n-heptane and acetic acid/water systems at total reflux. The deviations are within +/- 20% for 90% of the data points. The effect of a bed of mesh packing on the screen tray was also studied. It was found that the packing led to a higher tray effciency, but resulted in a higher tray pressure drop.     

Hydrodynamic and Mass Transfer Performances of a New SiC Foam Column Tray

The hydrodynamic performance of a novel SiC foam column tray (SFCT), made of thin slices of SiC foam material with a high specific surface area, is investigated. The performance parameters include pressure drop, entrainment, weeping, and clear liquid height. The tests are carried out with an air‐water system under atmospheric pressure. The mass transfer efficiency of the new SiC foam column tray is studied in a stainless‐steel plate column. The results provide some important parameters for the development of this innovative SiC foam tray.