基于PTFE针刺毡的除尘脱硝一体化滤料制备及其性能

Preparation and Performance of Catalytic Filters for Simultaneous Removal of Dust and Nitrogen Oxides Based on PTFE Felts

SCR脱硝催化剂和袋式除尘器是工业烟气治理的核心组件。除尘脱硝滤料可实现烟气粉尘与氮氧化物的协同治理。文章将硝酸锰、硝酸铈、聚四氟乙烯(PTFE)乳液和去离子水按一定比例配制成前驱体浸渍溶液,添加海藻酸钠、偶联剂等增强催化剂与滤料的黏结力;再经一步或二步浸轧-焙烘法制备除尘脱硝一体化滤料。研究发现,硝酸锰∶硝酸铈∶PTFE乳液∶去离子水的质量比为250∶125∶30∶200,浸轧辊压力为0.1 MPa,脱硝温度为180~220℃时为最佳制备条件,NO转化率可达90%以上,颗粒物(PM_(2.5))过滤效率达95%左右。在工业窑炉烟气处理中,合理布置除尘脱硝一体化滤料,可使资源和能耗合理利用,实现治理效果最优化。

SCR catalyst and bag filter are the core components of industrial flue gas treatment.Dust and NOx removal filter can realize the coordinated treatment of nitrogen oxides and dust in the field of flue gas treatment.This paper integrated manganese nitrate,cerium nitrate,polytetrafluoroethylene(PTFE)emulsion and deionized water to formulate a precursor impregnation solution in a certain proportion,adding sodium alginate,coupling agent,etc.to enhance the adhesion between the catalyst and the filter material.And the integrated filter material for dust removal and denitration is prepared by one-step or two-step padding-curing methods.Results indicated that when the mass ratio of manganese nitrate/cerium nitrate/PTFE emulsion/deionized water is 250∶125∶30∶200,the pressure of padding roll is 0.1 MPa and the denitration temperature is 180-220℃,it is the best conditions.Under this condition,the NO degradation rate is over 90%,and the filtration efficiency of particulate(PM2.5)is about 95%.In the treatment of flue gas from industrial kilns,a reasonable arrangement of integrated filter materials for dust removal and denitrification is important,which can make the rational use of resources and energy consumption and achieve the optimal treatment effect.