Flue gas denitration system and method

Abstract

The invention relates to the technical field of atmospheric environmental protection treatment, in particular to a flue gas denitration system. The flue gas denitration system comprises a flue gas drainage channel, an ammonia water spray gun is inserted in the flue gas drainage channel, a preset angle is formed between the length direction of the ammonia water spray gun and the drainage direction of the flue gas drainage channel, and the ammonia water spray gun is provided with a plurality of spray heads at intervals in the length direction of the ammonia water spray gun. The spraying direction of the nozzle is opposite to the drainage direction of the flue gas drainage channel or the included angle is an obtuse angle, so that the spraying direction of the ammonia water is opposite to the flowing direction of the smoke or the included angle is an obtuse angle, the smoke and the ammonia water mist are intensely collided, and nitrogen oxides in the flue gas are fully mixed with the ammonia water; the reaction efficiency of ammonia water and nitrogen oxide is improved, so that the ammonia water is saved and the nitrogen emission of oxygen is reduced. The denitration method is based on the denitration system, nitrogen oxide in the flue gas can be fully mixed with the ammonia water, the reaction efficiency of the ammonia water and the nitrogen oxide is improved, the ammonia water is saved, and nitrogen emission of oxygen is reduced.

Description

technical field [0001] The invention relates to the technical field of atmospheric environmental protection treatment, in particular to a flue gas denitrification system and method. Background technique [0002] At present, there are more than 1,700 cement kiln production lines in my country, and almost all production lines have added SNCR denitrification systems. Previously, the national requirement for nitrogen oxide emissions from cement kiln tail chimneys was 400mg / Nm 3 , the key area is 320mg / Nm 3 , in recent years, my country's nitrogen oxides (NO X ) emissions are getting more and more attention, and the emission standards are becoming stricter. Some local governments have also gradually strengthened the control of atmospheric NOX emission standards, and have begun (or plan) to control atmospheric NOX emission standards at 50mg / Nm3, while meeting the ammonia escape concentration of less than 5mg / Nm 3 . Many cement enterprises can only increase the injection amoun...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned existing SNCR out-of-stock system, the technical problem that the nitrogen oxides in the flue gas cannot be fully contacted with ammonia water due to the absence of a mixing device; The flow direction is opposite, and the ammonia water directly collides with the flue gas after spraying out, which can ensure that the nitrogen oxides in the flue gas are fully mixed with the ammonia water, and improve the reaction efficiency of the ammonia water and nitrogen oxides, so as to save ammonia water and reduce nitrogen emissions from oxygen

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