泡沫碳化硅塔盘的气相分布性能研究

发布时间：2018-06-28 21:49

本文选题：泡沫碳化硅塔板 + 气体分布性能　；参考：《天津大学》2015年硕士论文

【摘要】：在之前的研究中,利用泡沫碳化硅陶瓷开发出一种新型整体泡沫碳化硅塔板,该塔板具有良好的流体力学性能与传质性能,然而在操作中发现在气相动能因子较小时,该塔板存在着气体分布不均的问题,为改进此泡沫塔板的气体分布性能并为其工业化推广提供理论依据,本文对该塔板上的气体分布过程进行了研究。在本文中,泡沫碳化硅塔板的气体分布性能的研究从两个方面展开,一是利用电导探针技术测试塔板上方局部气含率的分布情况以衡量径向上鼓泡是否均匀;二是使用高速摄像机采集塔板液层中的气泡图像,并统计气泡尺寸分布以衡量气泡是否细小均匀。在局部气含率分布的测试过程中,研究了不同孔径、厚度的泡沫碳化硅塔板上气体分布情况,并讨论了在不同气相动能因子下的变化规律。在此基础上,建立了泡沫碳化硅塔板上气体分布过程的三阶段模型,并发现泡沫碳化硅的表面结构与泡沫压降是决定气体分布性能的关键因素。在对碳化硅泡沫气体分布过程研究的基础上,结合设计和安装,对碳化硅泡沫阀塔盘进行了改进,开发出一种气体分布性能更加优良且更加适合工业推广的新型碳化硅泡沫阀塔盘,重点调整了泡沫阀与塔盘的连接方式,使其安装更加方便,适于工业化应用。为验证改进后塔盘的流体力学性能是否得到改善,本文同时对该新型碳化硅泡沫阀塔盘进行了流体力学性能测试,在?600mm的塔内测试其塔板压降、雾沫夹带量、清液层高度与漏液线。与按工业标准设计制成的F1浮阀塔盘相比,碳化硅泡沫阀塔盘由于较高的开孔率使其干板压降要远低于F1浮阀塔盘;而且得益于其多孔泡沫结构,该新型塔盘在小气速下不会漏液仍能正常操作;虽然碳化硅泡沫阀塔盘有着湿板压降较大的缺点,但是总体而言,新型碳化硅泡沫阀塔盘是一种流体力学性能优良的塔盘,并且具有广阔的市场前景。
[Abstract]:In previous studies, a new type of monolithic foam silicon carbide tray was developed by using foam silicon carbide ceramics. The tray has good hydrodynamic and mass transfer properties, but in operation it is found that the kinetic energy factor of the gas phase is small. In order to improve the gas distribution performance of the foam tray and provide a theoretical basis for its industrialization, the gas distribution process on the tray is studied in this paper. In this paper, the gas distribution performance of foam silicon carbide trays is studied from two aspects. One is to measure the distribution of local gas holdup over the tray by conductance probe technique to measure whether the bubble is uniform or not. Secondly, the bubble image in the liquid layer of tray was collected by high speed camera, and the size distribution of bubble was calculated to measure whether the bubble was fine and uniform. In the process of measuring the local gas holdup distribution, the gas distribution on foamed silicon carbide trays with different pore sizes and thickness was studied, and the variation law of gas kinetic energy factors was discussed. On this basis, a three-stage model of gas distribution on foamed silicon carbide trays is established, and it is found that the surface structure and pressure drop of foam silicon carbide are the key factors to determine the gas distribution performance. Based on the study of the gas distribution process of silicon carbide foam, the valve tray of silicon carbide foam valve was improved by combining the design and installation. A new type of silicon carbide foam valve tray with better gas distribution performance and more suitable for industrial popularization has been developed. The connection between the foam valve and the tray has been adjusted to make it more convenient to install and suitable for industrial application. In order to verify whether the hydrodynamic performance of the improved tray has been improved or not, the hydrodynamic properties of the new silicon carbide foam valve tray are also tested in this paper. The pressure drop of the tray and the entrainment amount of foam are measured in a 600mm column. Clear liquid layer height and leakage line. Compared with F1 floating valve trays designed according to industry standards, silicon carbide foam valve trays have a much lower dry plate pressure drop due to higher opening rate than F1 floating valve trays, and benefit from their porous foam structure. Although the silicon carbide foam valve tray has the disadvantage of large wet plate pressure drop, in general, the new silicon carbide foam valve tray is a kind of tray with excellent hydrodynamic properties. And have broad market prospect.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ053.5

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