A device for flue gas desulfurization and denitrification

Abstract

The invention relates to the field of air purifying apparatuses, and relates to an apparatus for flue gas desulfurization and denitrification. The apparatus for flue gas desulfurization and denitrification comprises a first polyphase reactor system, a water circulation system, a slurry pool, a slurry discharge device, a gas outlet pipeline, a second polyphase reactor and a water spraying device; and a necking ring is arranged between the first polyphase reactor system and the slurry pool, the bottom of the necking ring is provided with an auxiliary polyphase reactor, a demister is arranged between the auxiliary polyphase reactor and the slurry pool, and the gas inlet end of the gas outlet pipeline is positioned between the demister and the necking ring. The apparatus for flue gas desulfurization and denitrification has the advantages of novel structure, good desulfurization, denitrification and dust removal effects on flue gas generated in the combustion process, and high desulfurization rate, denitrification rate and fine particle PM2.5 dust purifying rate of the flue gas.

Description

technical field [0001] The invention relates to the field of air purification equipment, in particular to equipment for purifying flue gas produced by industrial combustion and desulfurizing and denitrifying the flue gas. Background technique [0002] The industrial flue gas produced by industrial fuel combustion mainly refers to a large amount of flue gas and dust produced by the combustion of industrial boilers. In my country, SO 2 About 90% of emissions are mainly from coal combustion, and 90% of NOx comes from fuel combustion. Thermal power enterprises and metal smelting enterprises will produce a large amount of flue gas in the production process. Therefore, desulfurization and denitrification are the most important methods for China to control coal-burning pollution and improve the atmospheric environment. Target. For example, in metal smelting steel plants, the exhaust gas contains sulfur oxides, nitrogen oxides, carbide steel slag and other waste slag dust; the exha...

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Problems solved by technology

[0003] The applicant has applied for equipment for flue gas desulfurization and denitrification, such as Chinese patent CN201310562110.2, and found other problems in the process of use, specifically: 1. The multiphase reactor structure of the main flue gas treatment device is not good. Reasonable, which affects the desulfurization and denitrification purification treatment effect; 2. Part of the granular objects and high-temperature flue gas passing through the multiphase reactor will not fall into the slurry tank and will be directly discharged from the outlet pipe; 3. In order to increase the waste residue in the slurry tank Oxidation-reduction efficiency, air will be rushed into the slurry tank, and a large number of air bubbles will be generated when the air is injected into the slurry tank. The water pumping volume of the water pump is very large, and the service life of the pump will be reduced if there are too many air bubbles.

In addition, the treatment time of flue gas desulfurization and denitrification equipment with return pipe structure is long

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