Preparation And Study Of Applicable Technology Of Inorganic Membrane Used In The High-temperature Gas Cleaning

Development of high-temperature gas cleaning technology reported from references wasnecessary in the paper. The application of all kinds of high-temperature dust removaltechnology on hot gas cleaning was analyzed generally on the basis of the filtrationperformance of hot filters and the high-temperature performance of filterable material. Ahigh-temperature silicon carbide porous ceramic filter applied to hot gas cleaning was putforward,which takes on wide market application foreground. The silicon carbide porousfiltration material is provided with enduring high temperature and erosion, high strength,strong resisting oxidation, excellent resistance to thermal shock and excellent filtrationperformance.In this thesis, the porous silicon carbide ceramics of excellent performance was preparedby adding coal powder as pore-forming agent and extrusion moulding process. The influencefactors on the properties of porous silicon carbide ceramics were investigated by means ofSEM, XRD and so on. Firstly, the effects of stuff granularity, contents of pore former andsintering aids, sintering temperature and the other factors on the porosity, the average poresize, the pore size distribution, the gas flux and the cross-bending strength of porous siliconcarbide ceramics were studied. Analysis of measured data indicated that obvious regularitywas not be found in the effects of all kinds of factors mentioned above on porous ceramics.But porous ceramics was relation to the high-temperature characteristic of sintering aids.Secondly, the influence of the composite characteristics on the properties of porous ceramicswas discussed. The result indicated that the properties of the composite were superior to thematrix except the gas flux.Additionally, based on the above study, simulation of dust removal of the porous SiCceramics was studied at normal atmospheric temperature. The influence of the differentmaterial median diameter and the composite membrane on the properties of filterablematerials was investigated. The results showed that the ceramic filterable media made of lessceramic particles was provided with better filtration efficiency than that of bigger ceramicparticles for the traditional matrix filtration media, but which took on the high pressure dropand difficult cleaning dust at the result of the hole jam. The composite membrane of fromdeep-seated filtration to surface filtration was provided with not only the best filtrationefficiency but also less pressure drop, which attained better effect of the dust removal underthe lower reverse cleaning and saved resources than traditional filtration media. The newcomposite membrane is seasoned with the demand of filtration and cleaning dust in theindustrial dust removal and has better social, economic and environmental value thantraditional matrix filtration media. The base and method of optimization design for theceramic filter element is provided.