本文選題：泡沫碳化硅塔板 + 氣體分布性能　； 參考：《天津大學》2015年碩士論文

【摘要】：在之前的研究中,利用泡沫碳化硅陶瓷開發(fā)出一種新型整體泡沫碳化硅塔板,該塔板具有良好的流體力學性能與傳質(zhì)性能,然而在操作中發(fā)現(xiàn)在氣相動能因子較小時,該塔板存在著氣體分布不均的問題,為改進此泡沫塔板的氣體分布性能并為其工業(yè)化推廣提供理論依據(jù),本文對該塔板上的氣體分布過程進行了研究。在本文中,泡沫碳化硅塔板的氣體分布性能的研究從兩個方面展開,一是利用電導探針技術測試塔板上方局部氣含率的分布情況以衡量徑向上鼓泡是否均勻;二是使用高速攝像機采集塔板液層中的氣泡圖像,并統(tǒng)計氣泡尺寸分布以衡量氣泡是否細小均勻。在局部氣含率分布的測試過程中,研究了不同孔徑、厚度的泡沫碳化硅塔板上氣體分布情況,并討論了在不同氣相動能因子下的變化規(guī)律。在此基礎上,建立了泡沫碳化硅塔板上氣體分布過程的三階段模型,并發(fā)現(xiàn)泡沫碳化硅的表面結構與泡沫壓降是決定氣體分布性能的關鍵因素。在對碳化硅泡沫氣體分布過程研究的基礎上,結合設計和安裝,對碳化硅泡沫閥塔盤進行了改進,開發(fā)出一種氣體分布性能更加優(yōu)良且更加適合工業(yè)推廣的新型碳化硅泡沫閥塔盤,重點調(diào)整了泡沫閥與塔盤的連接方式,使其安裝更加方便,適于工業(yè)化應用。為驗證改進后塔盤的流體力學性能是否得到改善,本文同時對該新型碳化硅泡沫閥塔盤進行了流體力學性能測試,在?600mm的塔內(nèi)測試其塔板壓降、霧沫夾帶量、清液層高度與漏液線。與按工業(yè)標準設計制成的F1浮閥塔盤相比,碳化硅泡沫閥塔盤由于較高的開孔率使其干板壓降要遠低于F1浮閥塔盤;而且得益于其多孔泡沫結構,該新型塔盤在小氣速下不會漏液仍能正常操作;雖然碳化硅泡沫閥塔盤有著濕板壓降較大的缺點,但是總體而言,新型碳化硅泡沫閥塔盤是一種流體力學性能優(yōu)良的塔盤,并且具有廣闊的市場前景。
[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.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ053.5

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