(57) A method for removing nitrogen oxides in a flue gas: (1) pretreating a flue gas containing nitrogen oxides in a pretreatment vessel, removing solid particles greater than 10 micrometers in diameter in the flue gas during the pretreatment, and oxidizing NO into NO2; (2) introducing the pretreated flue gas into a denitration vessel, where the nitrogen oxides react with an oxidizer to produce nitric acid; and, (3) discharging a purified gas from the denitration vessel. A nano flue gas denitration system characterized in being constituted by a pretreatment chamber and a denitration chamber. An output end of the pretreatment chamber is connected to an input end of the denitration chamber. Advantage: the method and system provided effectively convert nitrogen oxides into nitric acid; therefore, benefits from recycling far exceed operating costs of the equipment itself, thus allowing a user to acquire further profits. This is applicable in other industry markets, including cement plants, steel mill, municipal waste incineration plants, medical waste incineration plant, chlorine production plants, pulp and paper mills.
(71) Lin, Xiaoxiao, Beijing 100742 (CN); Che, Aileen Louise, Guangdong 523850 (CN)
(84) ARIPO (BW GH GM KE LR LS MW MZ NA RW SD SL ST SZ TZ UG ZM ZW), Eurasian (AM AZ BY KG KZ RU TJ TM), European (AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR), OAPI (BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN TD TG)