本文關(guān)鍵詞： 鈣鈦礦膜 中空纖維 集束 機械強度 氧滲透　出處：《天津工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：混合離子-電子陶瓷(MIEC)中空纖維透氧膜因具有能耗低、安裝方便、對氧具有100%選擇性等特點而受到廣泛關(guān)注,但是陶瓷中空纖維膜固有的脆性以及直徑小、壁厚薄而導致膜的機械強度低,并且在高溫下難密封且不易組件,這些限制了它的大規(guī)模應用。本文針對這些問題展開了一系列研究,選擇La0.6Sr0.4Co0.2Fe0.803-δ(LSCF)中空纖維膜作為研究對象,采用鈣鈦礦材料作為粘結(jié)劑將多根LSCF膜進行集束,探究該方法對膜的透氧量和機械強度的影響,并對LSCF膜束的高溫密封做了一定的研究。LSCF是典型的MIEC膜材料,因此我們選擇LSCF膜進行集束,為了達到更好的集束效果,本章選擇了 LSCF鈣鈦礦材料作為粘結(jié)劑。并對LSCF中空纖維膜束進行一系列表征和氧滲透測試,實驗結(jié)果表明利用具有多孔結(jié)構(gòu)的鈣鈦礦材料對中空纖維膜集束不僅能提高膜束的機械強度而且還促進了膜束的表面交換動力學,因而提高了氧滲透速率。機械強度由單根膜的112.68MPa提高到10根膜束的150.5MPa;透氧量由單根膜的0.4mLcm-2min-1提高到10根膜束的0.61 mL cm-2min-1,其中膜束的最佳孔隙率范圍在0.26-0.38之間,過低的孔隙率會對膜束的氧滲透性能造成阻力。同時中空纖維膜束在氧滲透過程中表現(xiàn)出很好的穩(wěn)定性。LSCF材料穩(wěn)定性高但透氧量偏低,而Ba0.5Sr0.5Co0.4Fe0.6O3-δ(BSCF)材料表現(xiàn)出很高的透氧量更有利于表面氧交換反應動力學,因此我們選擇BSCF材料作為粘結(jié)劑對LSCF膜進行集束。單根膜透氧量為0.42 mL cm-2 min-1提高到10根膜束透氧量為的0.66 mL cm-2min-1,同時機械強度由單根膜的112.68 MPa提高到10根膜束的139.6 MPa。利用BSCF粉體作為粘結(jié)劑集束的中空纖維膜氧滲透通量高于LSCF粉體作為粘結(jié)劑所制備的,同時中空纖維膜束在氧滲透中也表現(xiàn)出很好的穩(wěn)定性。通過測試各種密封膠的最高工作溫度,選定HBC-1096膠作為密封材料然后與LSCF粉體按照一定的比例配制成密封劑。在對LSCF中空纖維膜束進行透氧測試前,利用所配制的密封劑對LSCF膜束進行密封,采用銀漿作為陶瓷中空纖維膜束的保護層,防止LSCF膜束與所配制的密封劑發(fā)生反應,影響其機械強度和透氧性能。結(jié)果表明:當采用銀漿作為4根LSCF中空膜束的密封保護層時,膜束的機械強度由原來的89.7 MPa提高到135.6 MPa。
[Abstract]:Mixed ionic electronic ceramics (MIEC) hollow fiber membrane with low energy consumption, convenient installation, the oxygen with 100% selectivity and attracted widespread attention, but the inherent brittleness of ceramic hollow fiber membrane and small diameter, wall thickness and mechanical strength of the film caused low, and at high temperature and hard sealing easy assembly, which limits its large-scale application. This paper carries out a series of research, selection of La0.6Sr0.4Co0.2Fe0.803- 8 (LSCF) hollow fiber membrane as the research object, as a binder a plurality of LSCF film by cluster perovskite materials, explore the method of oxygen permeability and mechanical strength of the membrane, and high temperature on LSCF the sealing film bundle to do the research of.LSCF is the typical MIEC film material, so we choose LSCF membrane bundle, in order to achieve better clustering effect, this chapter chooses the LSCF perovskite material The material as binder. The LSCF hollow fiber membrane beam through a series of characterization and oxygen permeation test, the experimental results show that the porous perovskite materials of hollow fiber membrane cluster can not only improve the mechanical strength of the membrane bundle but also promote the exchange of film on the surface of beam dynamics, thus increasing the oxygen permeation rate of mechanical strength. A single film increased from 112.68MPa to 10 root membrane bundle 150.5MPa; oxygen permeability increased by a single membrane 0.4mLcm-2min-1 to 10 beam 0.61 mL cm-2min-1 film, the film bundle the best porosity in the range of 0.26-0.38, the low porosity of the membrane bundle oxygen permeability by resistance. At the same time the hollow fiber membrane bundle in oxygen the penetration process showed good stability and stability of.LSCF materials but high oxygen permeability is low, and the Ba0.5Sr0.5Co0.4Fe0.6O3- Delta (BSCF) materials exhibit high oxygen permeability is more conducive to the surface The oxygen exchange reaction kinetics, so we choose BSCF as the binder material on the LSCF film. The single bundle membrane oxygen 0.42 mL cm-2 min-1 increased to 10 for the beam root membrane oxygen permeability of 0.66 mL cm-2min-1, and the mechanical strength by a single membrane of 112.68 MPa increased to 10 of the 139.6 MPa. as the root membrane bundle of hollow fiber membrane oxygen a binder permeation flux is higher than that of LSCF powder as a binder prepared by using BSCF powder, and the hollow fiber membrane bundle in oxygen permeability also showed good stability. The maximum working temperature of test sealant, selected HBC-1096 gum as the sealing material and LSCF powder according to a certain proportion of sealant in the beam of LSCF hollow fiber membrane oxygen permeability of LSCF membrane before the test beam is sealed by the sealant prepared by using silver paste as a protective layer of ceramic hollow fiber membrane bundle, prevention The LSCF membrane is reacted with the prepared sealant, affecting its mechanical strength and oxygen permeability. The results show that when the silver paste is used as the seal protection layer of 4 LSCF hollow film bundles, the mechanical strength of the membrane bundle is increased from 89.7 MPa to 135.6 MPa..

【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ051.893

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本文編號：1488103