Static mixer for selective catalytic reduction flue gas denitration system

Abstract

The invention discloses a static mixer for a selective catalytic reduction flue gas denitration system. The static mixer is mounted in a flue of the denitration system, and comprises a plurality of mixing units in the same structure, wherein each mixing unit is formed by jointly splicing eight identical right-angle set square structures around the same central point; the eight identical right-angle set square structures are divided into four groups; each group comprises two right-angle triangle structures connected via right-angle sides; the adjacent groups are completely connected via bevel sides of the right-angle set square structures respectively; and central points of the mixing units are correspondingly located right above circle centers of nozzles of an ammonia spray grid of the flue respectively. According to the static mixer, the mixing degree of ammonia and flue gas can be improved significantly; the uniformity of a mole ratio of ammonia to nitrogen is improved; smaller pressure loss of the system is generated; short-distance mixing is achieved; and the static mixer has the characteristics of obvious burbling effect, compact overall structure, convenience in processing and mounting and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification devices in coal-fired power plants, and more specifically relates to a static mixer used in a selective catalytic reduction (SCR) flue gas denitrification system. Background technique [0002] At present, my country has increasingly stringent requirements on the emission control of nitrogen oxides from coal-fired power plants. Selective Catalytic Reduction (SCR) flue gas denitrification method is an efficient and mature technology. At present, the highest denitrification efficiency can reach more than 90%. Therefore, it has been widely used in the field of nitrogen oxide pollutant control in domestic and foreign power plants. [0003] In the SCR reaction system, an important part of the ammonia / air mixing system, the ammonia nitrogen molar ratio directly affects the denitrification efficiency and ammonia slip rate. If the mixing of ammonia and NOx is uneven, the incompletely react...

AI Technical Summary

Problems solved by technology

However, further studies have shown that the traditional mixer has defects such as poor mixing effect, large system pressure loss, and complicated processing, so it is necessary to make further improvement or improvement in this field

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