本文選題：螺旋導(dǎo)流膜分離器　切入點(diǎn)：濃差極化　出處：《華東理工大學(xué)》2015年碩士論文

【摘要】：為抑制膜分離過程中的濃差極化和膜污染現(xiàn)象,強(qiáng)化膜分離過程,拓展膜分離的應(yīng)用領(lǐng)域,提出了一種新型的膜分離形式——螺旋導(dǎo)流膜分離器。論文首先利用Fluent軟件對螺旋導(dǎo)流膜分離器內(nèi)流體流動特性進(jìn)行數(shù)值模擬研究,分析了其新型的分離機(jī)理；然后,對流道結(jié)構(gòu)參數(shù)進(jìn)行優(yōu)化,并以此為基礎(chǔ)搭建了實(shí)驗(yàn)裝置,研究了新型膜分離器的分離性能；最后,在螺旋導(dǎo)流膜分離器的基礎(chǔ)上開發(fā)了螺旋流過濾器,實(shí)現(xiàn)了其工業(yè)運(yùn)行。論文主要得出如下結(jié)論：(1)螺旋導(dǎo)流膜分離器中由于壁面效應(yīng)引起的角渦流,能較好的抑制部分膜面的微粒上的沉積。內(nèi)置膜管式螺旋導(dǎo)流膜分離器,主要依靠懸浮液中固液兩相的密度差所受的離心力不同來抑制微粒在膜表面上的沉積,適用于分離微粒密度大于液相的、密度差較大懸浮液的分離。而外置膜管式螺旋導(dǎo)流膜分離器不同,由于Dean二次流靠近膜面,能將沉積膜面上的微粒帶回主流區(qū),從而減小濃差極化和膜污染現(xiàn)象,所以外置膜管式螺旋導(dǎo)流膜分離器適用于液固兩相密度差較小或相近的懸浮液的分離。(2)通過對矩形截面螺旋流的研究,矩形截面螺旋流在De=246左右時候就產(chǎn)生失穩(wěn),產(chǎn)生Dean二次流。對于螺旋導(dǎo)流膜分離器,矩形截面螺旋流的截面比在2.5-3.5之間,螺旋升角在10.4°～21.2°為較佳尺寸。(3)操作壓力較進(jìn)料流速更能提高膜滲透通量,而料液濃度的增加會導(dǎo)致膜滲透通量的下降。實(shí)驗(yàn)中操作壓力均處于膜分離臨界壓力以下,對于螺旋導(dǎo)流膜分離器的臨界壓力還有待實(shí)驗(yàn)研究。(4)在內(nèi)置螺旋導(dǎo)流膜分離器基礎(chǔ)上,開發(fā)了螺旋流過濾器,較好的解決了工業(yè)上跨密度懸浮液的分離。
[Abstract]:In order to restrain the concentration polarization and membrane fouling during membrane separation, strengthen the membrane separation process and expand the application field of membrane separation, a new type of membrane separation form-helical diversion membrane separator was proposed.In this paper, the fluid flow characteristics in the helical diversion membrane separator are studied by using Fluent software, and the new separation mechanism is analyzed, then the flow channel structure parameters are optimized, and the experimental device is built.The separation performance of the new membrane separator is studied. Finally, the helical flow filter is developed on the basis of the spiral diversion membrane separator, and the industrial operation of the filter is realized.The main conclusions of this paper are as follows: (1) the angular eddy current caused by wall effect in the spiral film separator can restrain the deposition of particles on the surface of the film.The inner membrane tube spiral diversion membrane separator mainly depends on the different centrifugal force of the density difference between the solid and liquid phases in the suspension to suppress the deposition of the particles on the membrane surface, which is suitable for separating the particles with a density greater than that of the liquid phase.Separation of suspensions with large density difference.Because the secondary flow of Dean is close to the membrane surface, the particles on the deposition surface can be brought back to the main stream, thus reducing the concentration polarization and membrane fouling.Therefore, the outer membrane tube spiral diversion membrane separator is suitable for the separation of suspensions with small or similar liquid-solid phase density. Through the study of the rectangular section helical flow, the rectangular cross section spiral flow produces instability at about the time of De=246.Dean secondary flow is generated.For the helical diversion membrane separator, the cross section ratio of the rectangular section helical flow is between 2.5-3.5, and the spiral rising angle is 10.4 擄or 21.2 擄. The operating pressure can improve the membrane permeation flux more than the feed flow rate.The increase of feed concentration will lead to the decrease of membrane permeation flux.In the experiment, the operating pressure is below the critical pressure of membrane separation. The critical pressure of the spiral diversion membrane separator needs to be studied experimentally. (4) the spiral flow filter is developed on the basis of the built-in spiral diversion membrane separator.The separation of industrial transdensity suspensions is well solved.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ051.893

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