Sintering denitrification system and nitrogen oxide removal method thereof

Abstract

A sintering denitrification system and a nitrogen oxide removal method thereof. The invention discloses a sintering denitrification system, comprising a sintering machine, air boxes, an electricprecipitator, a desulfurization device, a main exhaust fan and a chimney, which are connected by a sintering flue gas main pipeline. The system is characterized in that a branch pipe is led out from an outlet pipe of the air boxes in a nitrogen oxide high concentration zone as a sintering flue gas circulating pipeline; the sintering flue gas circulating pipe is successively connected with a circulating flue gas baffle valve, a dust remover, a natural gas entrance valve connected with an outer intake pipe, a circulating fan and a circulating flue gas cover, which is covered on a sinter layer right above the air boxes in nitrogen oxide high concentration zone. The sintering flue gas enters into air boxes in the high concentration zone, and introduces part of the flue gas into the flue gas circulating pipe to become circulating sintering flue gas; the volume of the circulating sintering flue gas is controlled by the circulating flue gas baffle valve; the circulating sintering flue gas is dedusted by the electricprecipitator and then mixed with natural gas and air entering from the natural gas entrance valve; the mixed gas is introduced into the circulating flue gas covert through the circulating fan; and the circulating sintering flue gas reacts with sintering flue gas with high NOx concentration for partial denitration.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for metallurgical sintering flue gas denitrification, and in particular relates to a sintering denitrification system and a method for removing nitrogen oxides. Background technique [0002] In the "Twelfth Five-Year Plan", my country has clearly defined the nitrogen oxides (NO x ) for full control. Specific reduction and control indicators are drawn up, the total control target of ammonia nitrogen emissions is to reduce by 10% compared with 2010, and the total nitrogen oxide emissions of key industries and key regions will be reduced by 10% compared with 2010. However, the composition of sintering flue gas in the iron and steel industry is complex. In addition to sulfur dioxide and dust, it also contains NO x and other pollutants. In the "Twelfth Five-Year Plan" basic idea of ​​total nitrogen oxides control, it is proposed that iron and steel and industrial boilers are also im...

AI Technical Summary

Problems solved by technology

makes the method unacceptable

[0005] In summary, the current denitrification methods in the sintering process, some of which are expensive, and some will affect the normal production of sintering, are difficult to apply in sintering

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