卷式炭膜膜组件的研制

发布时间：2018-04-12 16:11

本文选题：卷式膜组件 + 炭膜　；参考：《大连理工大学》2015年硕士论文

【摘要】：气体分离膜技术是一种新型气体分离技术,它具有能耗低、分离效率高、容易操作等优点。性能优异的膜材料是膜分离技术的核心,炭膜作为一种新型的无机膜,在气体分离方面具有优异的选择性,使得它具有广阔的发展前景。将膜材料制备成填装密度高、结构简单、易于放大的膜组件是将膜材料付诸实际应用的前提。常用的气体分离膜组件包括卷式、管式、板框式和中空纤维式膜组件,其中卷式膜组件的填装密度较高,能够对分离膜污染的控制、操作难度、堆积密度和渗透量的大小等重要问题进行较好的平衡,在工业应用中受到青睐。大连理工大学炭膜及多孔炭材料课题组研制出一种柔性的卷式炭膜,解决了传统炭膜机械强度差、不具有柔韧性的问题。为了推进卷式炭膜的工业化应用,本文针对卷式炭膜的膜组件制备进行研究。本文从研究粘结剂的基本性能入手,通过对粘结剂的固化时间、气密性、剥离强度以及气体渗透性的考察,选择出适宜制备炭膜膜组件的粘结剂；研究卷式炭膜膜组件中膜元件的直径随膜袋数量的变化关系,计算相关位置参数,并确定膜片、隔网等的位置关系,研究、选择和优化膜组件的卷制方法；制备出适用于卷式炭膜气体分离的膜组件。单组份聚氨酯粘结剂的固化时间长、气密性好、剥离强度大、测试气体几乎不能渗透,因此制备卷式炭膜膜组件效果最好的粘结剂是单组份聚氨酯。对膜组件卷制方法进行研究,得出每增加一个膜口袋,膜元件的横截面积量增加1592mm2,得出不同个数的膜口袋制备膜元件的相应直径,并计算错位量。粘结剂的质量随固化时间的变化先升高后降低,结合粘结剂的固化机理分析得出膜组件的卷制时间要控制在1个小时内。单组份聚氨酯粘结剂对卷式炭膜的浸润性优于聚合物膜,因此其对于卷式炭膜的粘附效果比聚合物膜更好。为了进行膜组件的气体渗透性能测试,配制甲烷与二氧化碳的混合气,根据二者的配气质量流量所得的甲烷浓度为x(%),配制完成的混合气中甲烷的浓度为y(%),x与y的关系为：y=0.9198x+0.0389。利用所配制的混合气对制备的膜组件进行气体渗透性能测试,膜组件的气体分离选择性与膜片的气体分离性能吻合,结果合理,说明本文对于气体分离卷式炭膜膜组件的研制具有可行性。
[Abstract]:Gas separation membrane technology is a new gas separation technology, which has the advantages of low energy consumption, high separation efficiency and easy operation.Membrane material with excellent performance is the core of membrane separation technology. As a new inorganic membrane, carbon membrane has excellent selectivity in gas separation, which makes it have a broad development prospect.It is the premise of practical application to fabricate membrane material into membrane assembly with high filling density, simple structure and easy amplification.The commonly used membrane assemblies for gas separation include coil, tubular, plate-frame and hollow fiber membrane assemblies, in which the packing density of the membrane assembly is high, and the fouling of the separation membrane can be controlled and the operation is difficult.The important issues such as packing density and permeability are well balanced and are favored in industrial applications.The carbon membrane and porous carbon materials team of Dalian University of Technology have developed a kind of flexible carbon film which solves the problem that the mechanical strength of the traditional carbon membrane is poor and it is not flexible.In order to promote the industrial application of reel carbon membrane, the preparation of membrane module of reel carbon membrane was studied in this paper.Based on the study of the basic properties of the binder, the binder suitable for the preparation of carbon membrane assembly was selected by investigating the curing time, gas tightness, peeling strength and gas permeability of the binder.The relationship between the diameter of membrane components and the number of film bags was studied, the relative position parameters were calculated, and the position relationships of the membrane plates and spacers were determined, and the methods of coiling of membrane assemblies were studied, selected and optimized.A membrane assembly suitable for carbon membrane gas separation was prepared.One-component polyurethane binder has the advantages of long curing time, good air tightness, high peeling strength and almost no penetration of test gas, so the best binder for the preparation of carbon membrane assembly is one-component polyurethane.The method of membrane assembly coiling is studied. It is concluded that the cross-sectional area of membrane element increases by 1592 mm ~ 2 for each additional membrane pocket, and the corresponding diameter of different number of membrane pockets is obtained, and the dislocation amount is calculated.The mass of binder increased firstly and then decreased with the change of curing time. The curling time of membrane assembly should be controlled within 1 hour by analyzing the curing mechanism of binder.The wettability of one-component polyurethane binder is better than that of polymer film, so the adhesive effect of one-component polyurethane binder is better than that of polymer film.The gas permeation performance of the prepared membrane assembly is tested by using the prepared mixture. The gas separation selectivity of the membrane assembly is in agreement with the gas separation performance of the membrane, and the results are reasonable.It shows that this paper is feasible for the development of carbon membrane assembly for gas separation.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.893

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