基于中空陶瓷膜超疏水改性的C02脱除实验研究

发布时间：2018-03-13 19:39

本文选题：表面改性　切入点：超疏水　出处：《华东理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：由于CO2等温室气体的大量排放所导致的温室效应己受到人们越来越多的关注。目前,C02捕集与封存技术是一种主要针对化石燃料燃烧排放的C02进行捕集的有效方式。当前膜气吸收技术中所采用的膜接触器大多为有机膜接触器,其在C02吸收方面仍然存在一些难以解决的问题。与有机膜接触器相比,无机陶瓷膜接触器具有良好的结构性、热稳定性和物化特性,且很少有关利用无机陶瓷膜接触器进行CO2吸收的研究报道。因此,很有必要对陶瓷膜接触器吸收C02的实验性能进行研究探讨。首先,本文采用十三氟代正辛基硅烷(FAS)疏水改性试剂对陶瓷膜表面进行疏水改性,并对其进行表征分析。结果表明,改性后的陶瓷膜表面接枝上了一层疏水分子层,具有接触角值为153。的超疏水特性,且疏水分子层对膜表面形貌和膜孔径未造成明显影响。其次,将超疏水陶瓷膜管组装制作成陶瓷膜接触器,选用单乙醇胺(MEA)水溶液作为CO：吸收液,进行C02吸收实验。考察基本操作变量的改变对C02脱除率和传质速率的影响。结果表明,选取质量浓度5%的MEA吸收液和一定操作条件,利用陶瓷膜接触器进行C02吸收能够获得良好的C02脱除效果,该接触器用于脱除C02是有效可行的。最后,采用陶瓷膜接触器和聚丙烯中空纤维膜接触器进行C02吸收实验、自清洁测试实验和电厂烟道气粉尘污染测试实验。通过实验对比得出,陶瓷膜接触器的传质性能和抗污染自清洁性优于聚丙烯中空纤维膜接触器,其实验传质系数值更接近于理论传质系数值(比值为0.94),能够保持较高的CO2脱除率和传质速率。陶瓷膜接触器经过干燥处理后能够恢复保持高于74%的C02吸收率,由此提出一种周期干燥交替循环的工艺操作模式进行电厂烟道气中C02的长期连续脱除,具有一定可行性和适用性。
[Abstract]:Greenhouse Effect, which is caused by a large amount of greenhouse gas emissions such as CO2, has attracted more and more attention. At present, the capture and storage technology of C02 is an effective way to capture CO2 mainly from fossil fuel combustion. Most of the membrane contactors used in the current membrane gas absorption technology are organic membrane contactors, Compared with the organic membrane contactor, the inorganic ceramic membrane contactor has good structure, thermal stability and physicochemical properties. Therefore, it is necessary to study the experimental performance of ceramic membrane contactor in absorbing CO2. In this paper, the surface of ceramic membrane was modified with 13 fluorooctyl silane hydrophobic modification reagent and characterized. The results showed that the surface of the modified ceramic membrane was grafted with a hydrophobic molecular layer. The contact angle is 153.The hydrophobic molecular layer has no obvious influence on the surface morphology and pore diameter of the membrane. Secondly, the superhydrophobic ceramic membrane tube is assembled to form a ceramic membrane contactor. Using monoethanolamine (MEA) aqueous solution as CO: absorbent, CO2 absorption experiments were carried out. The effects of the change of basic operating variables on the removal rate and mass transfer rate of CO2 were investigated. The results showed that the MEA absorbent solution with mass concentration of 5% and certain operating conditions were selected. Using ceramic membrane contactor to absorb CO2 can get good effect of CO2 removal. It is effective and feasible to use this contactor to remove CO2. Finally, the ceramic membrane contactor and polypropylene hollow fiber membrane contactor are used for CO2 absorption experiment. The experiments of self-cleaning test and dust pollution test of flue gas in power plant show that the mass transfer performance and anti-fouling self-cleaning property of ceramic membrane contactor are better than that of polypropylene hollow fiber membrane contactor. The experimental mass transfer coefficient value is closer to the theoretical mass transfer coefficient value (the ratio is 0.94g), which can keep high CO2 removal rate and mass transfer rate. The ceramic membrane contactor can recover and maintain the CO2 absorptivity higher than 74% after drying. Therefore, a process mode of cycle drying alternating cycle is put forward to remove CO2 from flue gas of power plant for a long time, which is feasible and applicable.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB306

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