The Effect Of Humidity On Dust Removal Performance Of Different Proporties

Atmospheric particulate matter pollution has seriously affected people's daily life and production. It is a great method to use PTFE membrane filter media to collect fine particulate matter. In the bag filter, the cake resistance is related to energy consumption and dust filter life. Cake resistance is decided by the structure between particles. The structure more porous, the cake resistance is smaller. The cake packing structure is closely related to the inter-particle forces, including van der Waals forces between the particles, static electricity and liquid bridge force, etc.. In wet conditions, the liquid bridge force becomes the main form of inter-particle forces. Therefore, we can change the structure of the filter cake deposited by changing the ambient humidity thereby affect the size of the inter-particle forces, and then reduce the resistance of the cake.This experiment researches the effect of humidity on inter-particle force by means of measuring particle collapse angle, and research the effect of humidity on dust removal performance of different properties such as particle size, surface hydrophobicity and particle size.Experimental results indicate that:(1) when the relative humidity is lower than 100%, inter-particle force and the growth rate of dust resistance becomes slower rapidly with a higher humidity; when relative humidity is 100%, this trend becomes weak. (2) The change trend between growth rate of dust resistance and humidity is more drastic when the particles own smaller size. (3) The change trend between growth rate of dust resistance and humidity is more drastic when particles own greater surface hydrophilic. (4) Particles with different shapes have a same trend between growth rate of dust resistance and humidity.