磁性多孔材料的制备及其在电磁除尘系统中的应用

Preparation of magnetic porous material and its applicationin electromagnetic dust removal system

采用磁场下电沉积方法,制备出以泡沫镍为基底的铁钴磁性多孔介质,并将其作为粉尘捕集体用于电磁动态除尘系统中,利用实验研究分析了磁场对电沉积Fe-Co@NF多孔介质形貌、相组成及磁性能的影响规律.结果表明:与无磁场和静磁场相比,旋转磁场下制备出的Fe-Co@NF磁性多孔介质镀层更加均匀,饱和磁化强度更高,并保留了泡沫镍本身高孔隙率的特性;将优选的Fe-Co@NF多孔介质用于电磁除尘系统中,当在多孔介质直径为1 mm、质量流量为0.1 g/s时,外加行进磁场有利于增大磁性多孔介质在除尘管道中的运动距离,提高与粉尘颗粒的碰撞概率,使除尘效率得到有效提高;捕集效率随磁场强度的增加而线性提高,B=0.15 T时粉尘捕集颗粒数比无磁场下提高了367%.

Iron-cobalt magnetic porous media based on foam nickel(NF)was prepared by electrodeposition under magnetic fields and used as dust collectors in an electromagnetic dynamic dust removal system.The effects of magnetic fields on the morphology,phase composition,and magnetic properties of the Fe-Co@NF porous media were experimentally studied.The results showed that the properties of the Fe-Co@NF prepared under a rotating magnetic field were better than that prepared under no magnetic field or a uniform magnetic field.The magnetic porous medium coating prepared under the rotating magnetic field was more uniform,with higher saturation magnetization,and retained the high porosity characteristic of nickel foam.The preferred Fe-Co@NF porous media were used in the electromagnetic dust removal system.It was found that when the diameter of porous media was 1mm and the mass flow was 01 g/s,the external traveling magnetic field was conducive to increasing the moving distance of magnetic porous media in the dust removal pipeline,to improve the collision probability with dust particles,which increased the dust removal efficiency.The trapping efficiency increased linearly with the increase of the magnetic field intensity.When the traveling magnetic field B=015 T,the number of trapped dust particles by the porous media increased up to 367%,compared with the trapping case under no magnetic field.