Method and system for decarburization through complete combustion of boiler as well as desulfurization, denitration and dust removal of exhaust gas

The invention belongs to a technical field of atmospheric air control and treatment of exhaust gas from coal fired boilers and relates to a method and a system for decarburization through complete combustion as well as desulfurization, denitration and dust removal of exhaust gas. The method for the invention includes the decarburization of 30% oxygen-rich gas in combustion. The invention also includes that sulfur trioxide as well as other mixed acid are formed in a reaction of 30%ozone-rich gas and sulfur dioxide and nitrogen oxides in exhaust gas with water containing PX purified liquid. Exhaust gas which is treated through desulfurization and denitration is soaked into a 100 nm-500 nm wet nano filter in water containing PX purified liquid for removal of PM 2.5 dust particles. Advantages: the decarburization through complete combustion is promoted by oxygen-rich gas and the desulfurization and denitration is promoted by ozone-rich gas. A wet nano filter is used for removal of PM 2.5 dust particles. Reaction