A device and method for the combined removal of flue gas dust removal and multiple pollutants

Abstract

The invention discloses a combined device and method for removing flue gas dust and multiple pollutants. According to the device and the method, a plasma technique is combined with a centrifugal separation technique, partial dust particles are electrified, are collided and agglomerated with one another and are accelerated to be separated from gas under a dual function of an electric field force and a centrifugal force, so that the removal efficiency of fine particles is improved; by utilizing active free radicals generated by plasma discharge, toxic organic substances such as VOC (volatile organic compounds), PAH (polycyclic aromatic hydrocarbon), and dioxin in the flue gas are decomposed as CO2 and H2O, and heavy metal is oxidized into metallic oxide to be gathered at the surface of fly ash; SO2 and NO react with the free radicals to generate NO2 and NO3 and react with ammonia injected from a lower part space of a cylinder to generate sulfate and nitrate, the sulfate, the nitrate and the metallic oxide are continuously gathered by taking the fly ash as a condensation nucleus, the grain size of the fly ash in increased, the fly ash moves towards a wall surface under the action of the centrifugal force, falls to an ash bucket under the action of the gravity and is removed, and the gas is exhausted from an air outlet after being separated from the fine particles. According to the device and the method, the combined removal of the multiple synergetic pollutants in the flue gas dust removal process is realized.

Description

technical field [0001] The invention belongs to the field of combined removal and purification of multiple pollutants in fossil fuel combustion, garbage incineration and various industrial waste gases, and relates to a device and method for combined removal of dust and multiple pollutants. Background technique [0002] Dust, sulfur oxides, nitrogen oxides, organic compounds, mercury, and heavy metals emitted by fossil fuel combustion have seriously deteriorated the air quality, resulting in a serious increase in the concentration of total suspended particulate matter in the air, which has caused serious harm and impact on humans and their living environment . [0003] Coal combustion, waste incineration power plants emit flue gas, industrial boilers, metallurgical kilns emit exhaust gas, and various exhaust gas emission sources in the chemical industry are the main man-made emission sources of air pollutants. my country is the largest coal consumer in the world. The smog ca...

AI Technical Summary

Problems solved by technology

Cyclone separator is one of the most mature flue gas dust removal technologies at present, but its removal efficiency for fine particles with a particle size of less than 5 μm is low, it is difficult to meet the increasingly stringent air emission standards, and it does not have the ability to remove other pollutants in flue gas. In addition to the ability

At present, conventional electrostatic precipitators, bag dust collectors, wet desulfurization and denitrification devices widely used in coal-fired power plants still have unsatisfactory removal effects on PM2.5, and there are many existing flue gas purification devices with complicated processes and high purification costs.

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