硅酸盐/聚四氟乙烯/芳纶针刺毡复合滤袋的制备与性能

Preparation and performance evaluation of PS particle/PTFE coating/aramid needle felt composite filter bags

为了研发适用严苛高温工业条件下使用的袋式除尘器用针刺毡滤袋,利用乳液浸渍后处理工艺制备了具有热电/压电特性的硅酸盐(Polar Silicate,PS)粉体/聚四氟乙烯(Polytetrafluoroethylene,PTFE)涂层复合芳纶针刺毡滤袋,探究了PS粉体粒径及附着浓度对复合滤袋捕集效率及阻力特性的影响规律,研究了复合滤袋机械性能,并通过扫描电镜(Scanning Electron Microscope,SEM)对复合滤袋进行了微观形貌分析。结果显示:PS粉体粒径对滤袋的阻力影响不大;PS粉体粒径在>21~32μm时,滤袋的过滤效率最大;最优附着浓度为6 mg/cm^(2)时,滤袋对0.3~1μm粒子的过滤效率提升幅度≥12.58百分点,滤袋的品质因数最高;PS粉体/PTFE/芳纶复合滤袋的耐磨性比芳纶针刺毡滤袋提升了19.86%,挺度提升了22.22%,纵向拉伸强度提升了14.07%。研究所制备的复合滤袋能够适应严苛的高温工业环境,可更好地控制工业排放的微细颗粒物。

The aim of this paper is to develop a needle felt filter bag suitable for demanding high-temperature industrial environments.To accomplish this objective,the following measures have been implemented:Utilizing the conventional aramid needle-felt filter bag as the base.Because of the viscosity of Polytetrafluoroethylene(PTFE) emulsion,the Polar Silicate(PS) particle effectively combines with the aramid needle-felt filter bag through the impregnation post-processing of PTFE emulsion.This process resulted in the preparation of a PS particle/PTFE emulsion coating composite aramid needle felt filter bag with thermoelectric and piezoelectric properties.The study experimentally investigated the impact of PS particle size and adhesion concentration on the collection efficiency and pressure drop of the composite filter bag.Additionally,it verified the influence of the spontaneous polarization of PS powder on the filtration performance of the composite filter bag,comparing it with Muscovite powder possessing similar properties to PS powder but without surface electricity.Furthermore,the mechanical properties of the composite filter bag were evaluated,including wear resistance,stiffness,and breaking strength.Micromorphological characteristics were analyzed using a scanning electron microscope.The results indicate that the PS particle size has a limited effect on the pressure drop characteristics of the composite filter bag.It was observed that when the PS particle size is approximately greater than >21-32 μm,the collection efficiency of the filter bag reaches its maximum.The collection efficiency for 0.3-1 μm particles increases by up to 12.58 percentage point when the optimal adhesion concentration is 6 mg/cm~2,resulting in the highest quality factor of the filter bag.In comparison to the raw aramid needle felt filter bag,the composite filter bag exhibits a significant improvement in wear resistance,stiffness,and tensile strength in the longitudinal direction,with increases of 19.86%,22.22%,and 14.07%,respectively.When employed in demanding high-temperature industrial environments,the composite filter bag undergoes exposure to wind pressure and high temperatures.This exposure triggers the piezoelectric and thermoelectric voltages of the PS powder,enhancing the control of fine particles emitted by the industry.