Enhanced coalescence and efficient granular layer filtering device for ultrafine particles

Abstract

The invention discloses an enhanced coalescence and efficient granular layer filtering device for ultrafine particles, and belongs to the technical field of flue gas purification. The filtering device comprises a pre-charging area, an agglomeration area and a filtering area, the pre-charging area comprises a conductive metal plate I, a ternary rare earth tungsten (W-La2O3-CeO2-Y2O3) barb and a conductive metal plate II; the agglomeration area comprises a primary coagulation area and an alternating electric field coagulation area; and the filtering area is a particle layer formed by porous particle swarms. According to the method, an electrode plate with ternary rare earth tungsten barbs serves as a discharge cathode, high-density free electrons, negative ions and positive ions exist in a whole electric field channel in a nanosecond pulse power supply mode through the diffusion discharge phenomenon, and superfine dust particles are subjected to sufficient and uniform heteropolar charge; secondly, the agglomeration and coagulation of the ultrafine dust particles are strengthened by utilizing the synergistic effect of a turbulent boundary layer, coulomb force and an alternating electric field; and finally, the dust particles are efficiently captured by a particle layer formed by porous particles.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to an enhanced coalescence and high-efficiency particle layer filter device for ultrafine particles. Background technique [0002] The efficient removal of ultrafine particles, especially submicron particles, is a common problem faced by industries such as energy, metallurgy, chemical industry, medicine, and food. It is not only of great significance to protecting people's health, but also crucial to safe production. So far, there are two main methods to improve the collection efficiency of fine particles: one: to further agglomerate the fine particles into large particles (ie coagulation), and then use traditional dust removal equipment to remove them; There are composite technologies that organically combine dust removal technologies to further improve the collection efficiency of fine particles, such as electrostatic bag filter, electrostatic cyclone dust collector, e...

AI Technical Summary

Problems solved by technology

Among them, electrocoagulation has attracted much attention because it is easier to meet the actual working conditions, has a large flow rate of processing gas, and is suitable for a wide range of particle sizes; electrocoagulation technologies mainly include coagulation of homopolarly charged particles in an alternating electric field, different Coulomb condensation of polar charged dust, coagulation of heteropolar charged particles in alternating electric field, coagulation of heteropolar charged particles in direct current electric field, among which heteropolar charged particles in alternating electric field The coagulation effect in the dust is the best. The key to this technology is how to obtain a sufficiently high heteropolar charge for ultrafine particles; the existing method of dust heteropolar charge is to alternately use positive and negative electrode corona discharge, but due to Due to the limitation of working voltage and gas discharge intensity, the charge capacity of ultrafine particles is low, which is also the bottleneck that makes it difficult to substantially improve the coagulation effect; It is difficult to achieve efficient purification of ultrafine particles, especially submicron particles

Images