分散降液筛板塔的性能研究

发布时间：2018-08-05 11:31

【摘要】：在传质分离领域,板式塔一直有广泛的应用,近年来,复合塔的发展逐渐成为该行业的主角。现有复合塔板大多采用已有塔板与填料的复合,塔板作为复合塔的核心部件,其作用不可忽视。因而,对复合塔板的开发也受到研究人员的广泛关注,研发合适的塔板是解决问题的核心。本课题研发了一种新型板式塔——分散降液筛板塔(DDST),主要对传统筛板的集中型降液管进行了改进,将传统筛板的弓形降液管改为数根均匀分布于塔板下的圆形细管,位于气孔构成的正三角形的中心。分散降液筛板塔正常操作工况下,上升的气体自下而上经由塔板的气孔穿过液层,板面上的液体自上而下通过均匀分布的分散降液管降至塔板下层空间。与传统筛板相比分散降液筛板具有如下的由点:1)塔板的鼓泡区域面积、气体和液体通道面积、塔的利用空间等均显著增加;2)消除液面落差;3)全塔上下全部空间形成一个连续、立体的微分式气液接触的传质过程;4)将分散降液筛板可以作为复合塔板的塔板组件具有良好的前景。本文以“氧气-空气-水”为体系,初步探讨了分散降液筛板塔的水力学性能、传质性能及其影响因素,并与传统筛板塔进行比较。结果表明:分散降液筛板压降小,雾沫夹带和相对漏液量均低于10%,具有良好的水力学性能,在同等条件下传质效率比传统筛板塔提高了约8.4%~9.7%。对实验数据进行关联回归,得出了分散降液筛板塔初步的水力学性能数学模型。分散降液筛板塔可以方便实现与填料等的复合,通过实验研究为今后采用分散降液筛板复合塔的研究奠定基础,同时为其工业应用提供理论依据。分散降液筛板塔作为门类众多的塔设备家族的新成员,不仅有望在传统的传质分离领域得到应用,在组合或复合塔领域更展示了其特殊优势。
[Abstract]:In the field of mass transfer separation, plate tower has been widely used. In recent years, the development of composite tower has gradually become the main role of the industry. Most of the existing composite trays are composed of existing trays and fillers, which can not be ignored as the core components of the composite towers. Therefore, the development of composite trays has been widely concerned by researchers, the research and development of suitable trays is the core of the problem. In this paper, a new type of plate-type tower, (DDST), has been developed to improve the centralized downflow pipe of traditional sieve plate, which is changed into several circular tubes distributed uniformly under the tray. Located at the center of an equilateral triangle formed by a stomata. Under normal operation condition, the rising gas passes through the air holes of the tray through the liquid layer, and the liquid on the plate drops from top to bottom to the lower space of the tray through the uniform distribution of the droplet tube. Compared with the traditional sieve plate, the dispersed down-liquid sieve plate has the following areas of bubbling area, gas and liquid passage area, tower utilization space and so on, which are significantly increased by point: 1) the area of the bubble area of the tray, and the utilization space of the tower, etc. (3) eliminating the drop difference of liquid level. 3) the whole tower forms a continuous space from all the upper and lower spaces. The dispersion drop sieve plate can be used as the tray assembly of composite tray in the process of mass transfer of three-dimensional micro-fraction gas-liquid contact. Based on the system of "oxygen, air and water", the hydraulics properties, mass transfer properties and influencing factors of dispersed down-liquid sieve tray column are discussed in this paper, and compared with the traditional sieve plate column. The results show that the pressure drop is small, the entrainment and the relative leakage are lower than 10, and the mass transfer efficiency is better than that of the traditional sieve tray under the same conditions. The mass transfer efficiency is about 8.49.7g higher than that of the traditional sieve tray. Based on the correlation regression of experimental data, a preliminary mathematical model of hydraulic performance of the dispersive down-liquid sieve tray column was obtained. The composite of dispersed down-liquid sieve plate column and filler can be realized conveniently. The experimental study will lay a foundation for the future study of the dispersed down-liquid sieve plate composite column and provide the theoretical basis for its industrial application. As a new member of a large number of families of tower equipment, the dispersive down-liquid sieve tray column is expected to be used in the traditional mass transfer separation field, and it also shows its special advantages in the field of combination or composite column.
【学位授予单位】：延安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ053.5

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