Ammonia spraying device of SCR (selective catalyst reduction) flue gas denitration system

Abstract

The invention discloses an ammonia spraying device of an SCR (selective catalyst reduction) flue gas denitration system. The ammonia spraying device comprises a plurality of input pipes (1) and a plurality of groups of uniformly distributed ammonia spraying units, wherein the input pipes (1) are uniformly arranged in a flue; the ammonia spraying units are connected with the input pipes (1) and are uniformly distributed; a spoiler (6) is arranged above each ammonia spraying unit; each ammonia spraying unit comprises a closing type spray pipe (4) and a branch pipe (3), and each branch pipe (3) is used for connecting the corresponding input pipe (1) and the corresponding closing type spray pipe (4); a spray nozzle (5) is arranged on each closing type spray pipe (4); each spoiler (6) comprises a casing and a plurality of blades arranged on the casing, and each blade (10) is of an arc-shaped trapezoidal structure. The ammonia spraying device has the advantages that by arranging the spoilers in the ammonia spraying device, flue gas can be fully and comprehensively mixed with ammonia gas in short distance, so that the additional arrangement of a static mixer is not needed, and the cost is low; by arranging the ammonia spraying device, the reverse flowing of the flue gas into an ammonia spraying pipeline is prevented.

Description

technical field [0001] The invention relates to the technical field of denitrification devices, in particular to an ammonia injection device for an SCR flue gas denitrification system. Background technique [0002] The emission of nitrogen oxides will cause a series of environmental problems and cause serious harm to people's health. From a global perspective, fuel combustion represented by coal is one of the main sources of nitrogen oxides in the atmosphere, and the selective catalytic reduction denitrification technology (SCR) has been widely used due to its simple structure, convenient operation, and high reliability. In commercial applications, the uniform mixing of reducing agent and nitrogen oxides and the flow field distribution of flue gas are one of the key factors affecting the denitrification efficiency. At present, ammonia injection grids are widely used to ensure the removal efficiency of nitrogen oxides. However, due to the large number of reductant injection...

AI Technical Summary

Problems solved by technology

However, this device achieves the purpose of mixing by setting a spoiler with an angle α with the direction of the flue gas, and the ammonia and flue gas form a vortex effect on the back of the spoiler to achieve the purpose of mixing. The mixing effect is not enough, and it is not easy to mix evenly.

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