Process for dedusting, desulphurization, denitration and flue gas purification

Abstract

The invention provides a new process for dedusting, desulphurization, denitration and flue gas purification. The process comprises the following components: a deduster, a reactor for desulphurization and denitration, a heating and insulation system, a waste heat recovery system, a reducing agent supplying system, and a sulfur collection system. The process flow comprises the following steps: flue gas is dedusted by a deduster and enters the reactor for desulphurization and denitration, after desulphurization and denitration, the high temperature flue gas enters the waste heat recovery system, and then low temperature discharge is carried out. A catalyst fills the reactor for desulphurization and denitration, at a certain temperature and in a reducing atmosphere, SO2 in the flue gas is reduced into S and collected by a sulfur collection system, and NOx is reduced into N2 and discharged along with the flue gas. The process realizes flue gas dedusting and integrated treatment of desulphurization and denitration at the same time, the process flow is simple, the purifying cost is low, waste heat of sulfur and flue gas is recovered, and the process is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of flue gas purification, and in particular relates to a dust removal, desulfurization and denitrification flue gas purification process. [0002] technical background [0003] In recent years, my country's air pollution problem has been relatively serious, and air pollution phenomena such as smog and acid rain have occurred from time to time. As far as the current energy structure is concerned, industrial kilns and thermal power plants are still the main sources of air pollutants, and the main pollutants are dust, SO 2 , NO x . At present, the commonly used and effective dust removal technologies at home and abroad are electrostatic dust removal and bag dust removal, and their working temperature is generally around 200 °C; the commonly used desulfurization technology is wet desulfurization, that is, lime milk gypsum method, dry desulfurization is less used; commonly used The denitrification technologies are SCR an...

AI Technical Summary

Problems solved by technology

Due to the complex process of these processes, it is bound to result in huge equipment investment, high site requirements, and high operating costs.

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