Method and system for boiler complete combustion decarburization and flue gas desulfurization dedusting

Abstract

The invention belongs to the technical field of coal-fired boiler flue gas treatment, and particularly relates to a method and system for boiler complete combustion decarburization and flue gas desulfurization dedusting. The method comprises the steps as follows: 30% of oxygen-enriched gases are decarburized in a combustion process, 30% of ozone-enriched gases react with sulfur dioxide and water in flue gases to produce dilute sulphuric acid for desulfurization, and desulfurized gases are fed into a nano filter soaked in the water for removal of PM2.5 dust particles, wherein the hole size of the nano filter is in a range of 100 nm-500 nm. The method and the system have the advantages that the 30% of oxygen-enriched gases promote coal to realize complete combustion for decarburization; the 30% of ozone-enriched gases are used for desulfurization, denitrification and the like; the PM2.5 dust particles are removed by a filter membrane with the hole size of 100 nm-500 nm; desulfurization and denitrification reaction products can be used as civil and industrial acid liquids, sulfur gypsum is not produced, sulfides, nitrides are not discharged, and acid rain is prevented; and mineral resources are saved, wastes of major boiler clients in power plants and steel mills are utilized comprehensively, and the waste is changed into wealth.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment of coal-fired boilers, and in particular relates to a method and system for desulfurization and dust removal of flue gas. Background technique [0002] Zhejiang University's Chinese patent application CN200610053090.6 "Coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitrification device and its method" discloses a coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitration device and its method. The method comprises the following steps: 1) spraying ozone O at a low temperature section of 110-150°C before or after the electrostatic precipitator 5 of the boiler flue 4 3 , the molar ratio of ozone sprayed into the nitrogen oxides in the boiler flue gas is 0.5 to 1.5, and the low-valence nitrogen oxides insoluble in water in the boiler flue gas are oxidized into high-valence nitrogen oxides that are easily soluble in water, and sulfu...

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Problems solved by technology

[0003] One of the disadvantages of this invention is that the ozone gas containing 21% concentration made by ordinary air containing only 21% oxygen is passed into the flue, and the oxidation effect of sulfide and nitride in the flue gas in the flue is not as good as 30% concentration The ozone gas oxidation effect of the ozone gas is good; the second is that the temperature of the flue gas at the position where the ozone gas is introduced into the flue gas is in the low temperature range of 110-150 °C, which also makes the oxidation effect of ozone on the sulfide and nitride in the flue gas in the flue gas less than 500-600 °C. Strong ozone with 30% ozone in the high temperature section has a good effect

The disadvantage is that the sulfur dioxide, the source of air pollution, is dissolved in water to form dilute sulfuric acid and prepared as a product for application.

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