The Design And Preparation Of Ceramic Hollow Fiber Oxygen Permeable Membrane Modules And The CFD Model Study Of Air Separation Oxygen Production Behavior

Attributing to the advantages of large specific surface area,high oxygen flux and high selectivity for oxygen permeation,and easy to assemble into devices,perovskite ceramic hollow fiber oxygen permeable membranes have attracted much attentions.However,due to the inherent brittleness of ceramic membranes and the lack of high-temperature sealing materials,it is currently difficult to prepare large-scale perovskite hollow fiber membrane modules that can be practically used.In this thesis,the design,preparation and air separation of perovskite ceramic hollow fiber oxygen permeation membrane module were studied.The high temperature sealing materials and high temperature sealing process of perovskite ceramic hollow fiber membrane were mainly studied.The oxygen separation CFD model is used to study the oxygen separation from air.Firstly,BaCo_0.85Bi_0.05Zr_0.1O_3-δ（BCBZ）perovskite ceramic hollow fiber oxygen permeable membrane was prepared by phase inversion sintering technology,and a suitable high-temperature sealing material was prepared by adding ceramic glue to BCBZ ceramic powder.The results showed that sealant made of SX-8317AB ceramic glue and BCBZ ceramic powder can seal the BCBZ ceramic hollow fiber membrane.At the same time,in order to prevent the reaction of the sealant and the ceramic membrane,silver as protective layer can be coated on the surface of ceramic hollow fiber membrane.The sealant can withstand as high as 850°C,and can be used to prepare ceramic hollow fiber oxygen permeable membrane modules.A membrane module was designed with one end closed ceramic hollow fibers.This module can be used for high temperature,pressurized feeding and vacuum oxygen collection.A CFD model of oxygen separation from air by perovskite ceramic hollow fiber membrane module was established.The hollow fiber membrane module prepared from La_0.6Sr_0.4Co_0.2Fe_0.8O_3-d（LSCF）hollow fiber membrane was used to verify the CFD model.The operating conditions such as temperature,pressure/vacuum degree were systematically studied.The results show that using high temperature feed and increasing the vacuum on the permeate side can significantly increase the oxygen production rate and oxygen recovery rate,while increasing the pressure on the feed side has limited effect on increasing the oxygen production rate.In addition,the influence of the feeding method on the flow velocity,pressure,and temperature distribution in the hollow fiber membrane module was studied by the CFD model.It was found that side feeding was helpful to improve the separation performance of the hollow fiber membrane module.The research results can be used to guide the design of perovskite ceramic hollow fiber membrane modules and the application of oxygen separation from air.