Ammonia spraying grating device

Abstract

The invention discloses an ammonia spraying grating device, which comprises multiple ammonia spraying main pipes (1) and multiple ammonia spraying branch pipes, wherein the multiple ammonia spraying main pipes (1) are arranged in parallel in the same section perpendicular to the flow direction of a flue gas; the multiple ammonia spraying branch pipes are communicated with the ammonia spraying main pipes (1); the ammonia spraying main pipes (1) are provided by multiple jet holes; the ammonia spraying branch pipes are perpendicularly inserted into the ammonia spraying main pipes respectively through the jet holes; an ammonia gas is diffused and sprayed out from the ammonia spraying main pipes through the ammonia spraying branch pipes to be mixed with the flue gas. The ammonia spraying grating device provided by the invention can be used for effectively promoting the diffusion mixing between the ammonia gas and the flue gas, ameliorating the distribution of the concentration field of the ammonia gas and improving reaction efficiency; the mixed ammonia gas is sprayed out from the ammonia spraying main pipes through the ammonia spraying branch pipes; the effect that the mixed ammonia gas is subjected to diffusion through the ammonia spraying branch pipes is obvious; the sprayed out ammonia gas can be sufficiently mixed with the flue gas through a short distance; the concentration distribution of the ammonia gas is quite uniform.

Description

technical field [0001] The invention relates to the field of environmental protection industrial flue gas treatment technology equipment, in particular to an ammonia injection grid device used in the flue of a denitrification and desulfurization system. Background technique [0002] In the current flue gas treatment system, the most commonly used flue gas denitrification technology is selective catalytic reduction (SCR). The injection and mixing of ammonia gas is one of the core process technologies, and the flue gas treatment technology is the most The central device is the ammonia injection grid (AIG). The ammonia injection grid is arranged in the flue, and the nozzles in the ammonia injection grid inject ammonia gas. Under the action of the catalyst, the injected ammonia (NH 3 ) and nitrogen oxides (NO X ) mixing reaction, the mixing degree of the two determines the denitrification efficiency. If the flue gas and ammonia gas are not mixed enough, the denitrification eff...

AI Technical Summary

Problems solved by technology

The ammonia injection grid is arranged in the flue, and the nozzles in the ammonia injection grid inject ammonia gas. Under the action of the catalyst, the injected ammonia (NH 3 ) and nitrogen oxides (NO X ) mixing and reacting, the mixing degree of the two determines the denitrification efficiency, if the flue gas and ammonia gas are not mixed enough, the denitrification efficiency will decrease and the ammonia escape will increase, resulting in serious secondary pollution

[0003] The structure of the traditional ammonia injection grid is to directly arrange the spray holes on the ammonia injection main pipe or to protrude the equal diameter (that is, non-gradient) ammonia injection branch pipes. ideal

When the flue length is not enough, the mixing uniformity of ammonia gas and flue gas is limited, which affects the denitrification efficiency

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