System for complete combustion decarburization and flue gas desulphurization and dust removal of boiler

The utility model belongs to the technical field of coal boiler flue gas treatment, in particular relates to a system for combustion decarburization and flue gas desulphurization and dust removal. 30 percent of oxygen-enriched gas is decarburized in the combustion process, 30 percent of ozone-enriched gas is reacted with sulfur dioxide and water in the flue gas to generate dilute sulphuric acid so as to realize the desulphurization, and the desulphurized gas is introduced into a nano filter with 100nm to 500nm micropores in water so as to remove PM2.5 (particulate matter2.5) dust particles. The system has advantages that 30 percent of oxygen-enriched gas can promote the complete combustion and decarburization of coal; desulphurization and denitrification are realized by virtue of 30 percent of ozone-enriched gas, the PM2.5 dust particles are removed through the 100nm to 500nm filter membrane, the desulphurization and denitrification reaction products can be used as industrial and civil acid liquid, no sulfur