Device and method for desulfurization and denitration of flue gas from boiler

Abstract

The invention relates to a device and a method for desulfurization and denitration of flue gas from a boiler. The device comprises an electrostatic dust remover, a direct cooler, a reactor, a light wave generator and a collector. The method comprises the following steps: allowing the flue gas from the boiler to enter the electrostatic dust remover, carrying out dust-removing treatment, then allowing dust-removed flue gas to enter the direct cooler, carrying out cooling to a set temperature in the direct cooler, then allowing obtained flue gas to enter the reactor, carrying out a reaction on the surface of an adsorption sensitizer reaction layer arranged in the reactor under irradiation of light waves generated by the light wave generator so as to generate a reaction product, and collectingthe reaction product into the collector. According to the invention, the electrostatic dust remover can remove a majority of solid particles in the flue gas from the boiler; the direct cooler can increase the reaction rates of SO2 and NOx in the flue gas in the reactor; the light wave generator has high degree of energy concentration; thus, after the flue gas passes through the reactor, few temperatures of the flue gas is increased, and the utilization rate of energy is improved; a final reaction product can also be used as an industrial raw material; in general, the device provided by the invention has low operation cost and can operate in a dry or semi-dry manner, so corrosivity is reduced, and the maintenance cost of the device is decreased.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a boiler flue gas desulfurization and denitrification device and method. Background technique [0002] The pollution produced by the flue gas emitted by boilers burning coal is one of the main sources of air pollution in my country. In the primary energy consumption and its composition, the proportion of coal burning is as high as 70%, and the major coal consumers in my country are mainly Coal-fired power plants, whose sulfur dioxide emissions and nitrogen oxide emissions account for a large proportion of total industrial emissions. The energy used for flue gas purification in the prior art is electron beam or high-voltage corona. The equipment construction costs of these two methods are expensive, and they are not suitable for coal-fired flue gas purification projects of medium and small boilers. In addition, because the existing technologies are all For wet and semi-dry met...

AI Technical Summary

Problems solved by technology

The energy used for flue gas purification in the prior art is electron beam or high-voltage corona. The equipment construction costs of these two methods are expensive, and they are not suitable for coal-fired flue gas purification projects of medium and small boilers. In addition, because the existing technologies are all For wet and semi-dry methods, the acid gas dissolves in water to form an acidic liquid, which is easy to corrode the metal reactor and greatly increases the maintenance cost of the equipment

Images