Flue gas cyclone mixing device of SCR denitration system

Abstract

The invention relates to a flue gas cyclone mixing device of an SCR denitration system. The flue gas cyclone mixing device comprises a cyclone mixer homogenizing device arranged behind ammonia spraying branch pipes in a flue gas flowing direction, wherein the cyclone mixer homogenizing device is composed of a plurality of cyclone mixers which are arranged in a tiled mode, and the rotational flow mixers are arranged to face the ammonia spraying branch pipes and used for covering diluted ammonia sprayed out of the ammonia spraying branch pipes; and each cyclone mixer is composed of an inner cyclone blade set and an outer cyclone blade set, the rotating directions of the two cyclone blade sets are opposite, and a circular partition plate used for dividing an airflow channel is arranged between the two cyclone blade sets. With the flue gas cyclone mixing device in the invention, the mixing effect of flue gas and diluted ammonia gas can be enhanced, and denitration reaction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a flue gas swirling mixing device of an SCR denitrification system. Background technique [0002] The boiler combustion of the thermal power unit produces nitrogen oxides and NOx exceeding the standard, and an SCR denitrification system is installed after the boiler economizer to remove the NOx in the flue gas. The ammonia injection branch pipe in the SCR denitrification reactor injects diluted ammonia gas and mixes it with flue gas. The mixed gas flows through the catalyst for biochemical reaction, and nitrogen oxides NOx are removed. [0003] The traditional SCR denitrification system airflow is evenly arranged as figure 1 As shown, the deflector 11 is arranged behind the ammonia injection branch pipe 12, and the flue gas and diluted ammonia are mixed evenly through the deflector 11. With the uniform device of the deflector, the mixing effect of th...

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Problems solved by technology

[0003] The traditional SCR denitrification system airflow is evenly arranged as figure 1 As shown, the deflector 11 is arranged behind the ammonia injection branch pipe 12, and the flue gas and diluted ammonia are mixed evenly through the deflector 11. With the uniform device of the deflector, the mixing effect of the flue gas and the diluted ammonia is not sufficient, and it is easy to Cause problems such as low denitrification effect, large amount of ammonia escape, blockage of air preheater, etc.

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