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An apparatus for removing nitrogen oxides from a flue gas comprises a first stage of injecting ammonia in a combustion flue gas and then hydrogen peroxide thereto, thereby decomposing nitrogen oxides in the combustion flue gas to nitrogen and water by gas phase reduction, and a second stage of passi

An apparatus for removing nitrogen oxides from a flue gas comprises a first stage of injecting ammonia in a combustion flue gas and then hydrogen peroxide thereto, thereby decomposing nitrogen oxides in the combustion flue gas to nitrogen and water by gas phase reduction, and a second stage of passing the combustion flue gas leaving the first stage through a bed of catalyst whose temperature is controlled by cooling water passing through a cooling pipe provided through the bed of catalyst, thereby conducting decomposition of excess ammonia exiting from the first stage and further reaction of nitrogen oxides at the same time.

대표청구항 ▼

An apparatus for removing nitrogen oxides from a combustion flue gas, which comprises a flue gas duct for passing a combustion flue gas containing nitrogen oxides therethrough, means for adding ammonia and hydrogen peroxide into the flue gas passing through the flue gas duct, thereby reducing the ni

An apparatus for removing nitrogen oxides from a combustion flue gas, which comprises a flue gas duct for passing a combustion flue gas containing nitrogen oxides therethrough, means for adding ammonia and hydrogen peroxide into the flue gas passing through the flue gas duct, thereby reducing the nitrogen oxides in the flue gas in a gas phase, catalyst means comprised of a metallic oxide system for further reducing the remainder of nitrogen oxides, by directly contacting the flue gas, provided in the flue gas duct downstream of said means for adding ammonia and hydrogen peroxide to the flue gas duct and cooling means for cooling the catalyst means being provided within the catalyst means; the means for adding ammonia and hydrogen peroxide into the flue gas comprising one injector means for the ammonia and another injector means for the hydrogen peroxide.