本文選題：表面改性　切入點：超疏水　出處：《華東理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：由于CO2等溫室氣體的大量排放所導致的溫室效應己受到人們越來越多的關注。目前,C02捕集與封存技術是一種主要針對化石燃料燃燒排放的C02進行捕集的有效方式。當前膜氣吸收技術中所采用的膜接觸器大多為有機膜接觸器,其在C02吸收方面仍然存在一些難以解決的問題。與有機膜接觸器相比,無機陶瓷膜接觸器具有良好的結(jié)構(gòu)性、熱穩(wěn)定性和物化特性,且很少有關利用無機陶瓷膜接觸器進行CO2吸收的研究報道。因此,很有必要對陶瓷膜接觸器吸收C02的實驗性能進行研究探討。首先,本文采用十三氟代正辛基硅烷(FAS)疏水改性試劑對陶瓷膜表面進行疏水改性,并對其進行表征分析。結(jié)果表明,改性后的陶瓷膜表面接枝上了一層疏水分子層,具有接觸角值為153。的超疏水特性,且疏水分子層對膜表面形貌和膜孔徑未造成明顯影響。其次,將超疏水陶瓷膜管組裝制作成陶瓷膜接觸器,選用單乙醇胺(MEA)水溶液作為CO：吸收液,進行C02吸收實驗。考察基本操作變量的改變對C02脫除率和傳質(zhì)速率的影響。結(jié)果表明,選取質(zhì)量濃度5%的MEA吸收液和一定操作條件,利用陶瓷膜接觸器進行C02吸收能夠獲得良好的C02脫除效果,該接觸器用于脫除C02是有效可行的。最后,采用陶瓷膜接觸器和聚丙烯中空纖維膜接觸器進行C02吸收實驗、自清潔測試實驗和電廠煙道氣粉塵污染測試實驗。通過實驗對比得出,陶瓷膜接觸器的傳質(zhì)性能和抗污染自清潔性優(yōu)于聚丙烯中空纖維膜接觸器,其實驗傳質(zhì)系數(shù)值更接近于理論傳質(zhì)系數(shù)值(比值為0.94),能夠保持較高的CO2脫除率和傳質(zhì)速率。陶瓷膜接觸器經(jīng)過干燥處理后能夠恢復保持高于74%的C02吸收率,由此提出一種周期干燥交替循環(huán)的工藝操作模式進行電廠煙道氣中C02的長期連續(xù)脫除,具有一定可行性和適用性。
[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.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB306

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本文編號：1607889