Device for integrating ultra-clean emission, desulfurization, denitrification and dedusting of flue gas and process of device

Abstract

The invention discloses a device for integrating ultra-clean emission, desulfurization, denitrification and dedusting of flue gas, and a process of the device. The device comprises a tower body, wherein a flue gas inlet and a flue gas outlet are formed in the tower body; the flue gas inlet is formed in a lower side wall of the tower body; the flue gas outlet is formed in the top of the tower body; the device comprises a slurry pool, a desulfurization layer, an oxidation layer, a denitrification layer and a wet electrostatic precipitator from the tower bottom to top sequentially; the flue gas enters the tower body from the flue gas inlet, and is subjected to the desulfurization of a lower spraying layer, the oxidation of a middle oxidation layer, the denitrification of an upper spraying layer and the dedusting of the wet electrostatic precipitator sequentially, so that the flue gas at the outlet reaches ultra-clean emission standards of the flue gas. In the invention, ClO2 is used as an oxidant for oxidizing NO, and MgOH is used as a desulfurization and denitrification agent, to overcome the shortcomings of complicated structure and poor removal effect of a traditional desulfurization and denitrification device; fine particles in the flue gas can be removed in the same device in order by adopting a mode of mounting the wet electrostatic precipitator at the tower top, so as to effectively prevent the formation of 'gypsum rain' and improve the purification efficiency of the flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas purification treatment, in particular to an integrated device for ultra-clean emission of flue gas, desulfurization, denitrification and dust removal and a process thereof. Background technique [0002] my country uses coal as the main primary energy source. At present, the main utilization method of coal in my country is direct combustion. The huge amount of coal burning makes SO 2 , NO x , dust and other emissions far exceed the self-purification capacity of the environment, resulting in serious soot-type air pollution in many areas of our country. With the development of society, people pay more and more attention to the emission control of these coal-burning pollutants, starting from dust removal and gradually increasing to desulfurization and denitrification. At present, the new direction of green development of coal power is "near-zero emission" and "ultra-clean emission". [0003] As th...

AI Technical Summary

Problems solved by technology

[0010] In short, the existing desulfurization and denitrification technologies have the following problems: the generation process of ozone consumes a lot of energy and costs, and the half-life of ozone decomposition is very short. x The oxidation yield is very low, which inhibits the further popularization and application of the ozone oxidation process; hydrogen peroxide oxidation wet desulfurization and denitrification also has the problems of low oxidation efficiency and high operating costs

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