Integral device and method for efficient removal of flue gas pollutants through multistage washing wet process

Abstract

The invention discloses an integral device and method for efficient removal of flue gas pollutants through multistage washing wet process. Slurry partitioning and multistage washing are conducted, primary washing of flue gas is conducted with low-pH slurry so that the content of SO2 in flue gas can be reduced, then secondary washing is conducted on the flue gas with high-pH slurry, and finally the flue gas enters a ternary ultrasonic showering layer and enters an ultrasonic agglomeration chamber through a gas ascending channel; under the action of an acoustic amplifier in an inverse-V-shaped gas ascending cap, frequent collision occurs between particles to cause agglomeration, particles with size increased enter a water collection disc under clear water spraying of an ultrasonic showering disc, and then SO3 and fine particles are removed and efficient desulfurization is achieved. By means of the calcium-based wet desulphurization technique, ultra-low emission is achieved through synergism of desulphurization and dust removal, applicability to coal property is high, SO2, SO3 and particles are effectively removed, SO2 removing rate reaches 99.5%, SO3 removing rate reaches 80%, and particle removing rate reaches 85%.

Description

technical field [0001] The invention relates to the technical field of calcium-based wet desulfurization, in particular to an integrated device and method for efficiently removing SO2, SO3 and particulate matter from multi-stage scrubbed wet flue gas. Background technique [0002] At present, my country's environmental protection requirements for thermal power plants are becoming more and more stringent, and the emission standards of air pollutants in thermal power plants have been further improved, and the task of desulfurization and emission reduction faced by thermal power plants is becoming more and more severe. According to the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) issued by the Ministry of Environmental Protection, the existing desulfurization and dust removal devices in most thermal power plants cannot meet the new emission requirements, and it is necessary to upgrade the existing desulfurization and dust removal technologies I...

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Problems solved by technology

[0004] The present invention provides an integrated device and method for efficient removal of multi-stage washing wet flue gas pollutants. The purpose is to introduce three-stage ultrasonic shower layer technology to solve the problem of low SO removal rate in the existing calcium-based wet desulfurization technology. , to achieve synergistic removal of sulfur dust to achieve ultra-low emissions

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