Device and method for absorbing and filtering PM2.5 through Taylor vortex and chemical agglomeration coupling

Abstract

The invention discloses a device and method for absorbing and filtering PM2.5 by coupling Taylor vortex and chemical agglomeration, the method comprises the following steps of: feeding dusty flue gasinto a multi-layer Taylor vortex area through an air blower, opening an atomizing nozzle, spraying an agglomeration agent solution and mixing agglomeration agent solution with the PM2.5 particles in the flue gas, filtering by a filtering device, and feeding into an agglomeration agent solution preparation tank for later use. According to the device and method for absorbing and filtering PM2.5 through Taylor vortex and chemical agglomeration coupling, annular vortexes which are arranged in a positive and negative alternating and orderly mode are generated according to the Taylor vortex principle, a large specific surface contact area is provided for PM2.5 particles and an agglomeration agent, and collision contact between the PM2.5 particles and between the PM2.5 particles and the agglomeration agent is promoted. The collision frequency of the agglomeration agent and the dusty flue gas is increased, the contact retention time is prolonged through the layered annular vortex, the particlecapture probability is increased, agglomeration and growth of PM2.5 are further promoted, finally, the agglomerated and grown particles are removed through the coarse filter cotton, and the agglomeration agent circularly enters a spraying system.

Description

technical field [0001] The invention relates to the field of emission control of fine particles in flue gas of fossil fuel combustion, in particular to a device and method for coupling Taylor vortex and chemical agglomeration to absorb and filter PM2.5. Background technique [0002] my country's air pollution has changed from traditional bituminous coal-type pollution to trans-regional and composite pollution mainly based on PM2.5. Fine particles (PM2.5) refer to solid particles or liquid droplets with an aerodynamic diameter of ≤2.5 μm, also known as particulate matter that can enter the lungs. The size of particulate matter produced in industrial production can range from submicron-sized molecules to millimeter-sized coarse particles. The mass fraction of PM2.5 is not large, but the quantity ratio can account for more than 90% of the total number of particles. Due to the small particle size of fine particles, it is difficult for traditional conventional dust removal equip...

AI Technical Summary

Problems solved by technology

However, the single chemical agglomeration technology has a poor effect on PM2.5 agglomeration, and it is difficult to fully agglomerate fine particles so that the diameter reaches 5 μm and is intercepted by filter cotton. Therefore, we propose a device that couples Taylor vortex and chemical agglomeration to absorb and filter PM2.5 and method

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