Tripod nozzle device of thermal power station ammonia-injection and denitration system

Abstract

The invention discloses a tripod nozzle device of a thermal power station ammonia-injection and denitration system. The tripod nozzles of the denitration system are positioned in the same plane; the top end of an ammonia-injection straight pipe is provided with a center nozzle; two sides of the ammonia-injection straight pipe are evenly provided with two side nozzles; ammonia reaches the ammonia-injection straight pipe via a mixed pipe; ammonia pressure is stable, injection speed is even, and ammonia is injected to the outer space via three injection pipes of different angles; the ammonia is evenly distributed in the outer space, which is favorable for mixing the ammonia and smoke so as to improve the denitration efficiency of the thermal power station ammonia-injection and denitration system; and the ammonia escape amount of the system is reduced.

Description

technical field [0001] The invention relates to a component of an SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) flue gas denitrification system, in particular to a trident nozzle device of an ammonia injection denitrification system of a thermal power plant. Background technique [0002] Flue gas denitrification methods mainly include selective catalytic reduction (SCR) technology, selective non-catalytic reduction (SNCR) technology, SNCR / SCR combined flue gas denitrification technology, liquid absorption method, activated carbon adsorption method, etc. Among them, SCR technology is currently the most widely used and most effective mainstream technology, and its denitrification rate is above 80%. The main principle of SCR technology is to spray the reducing agent ammonia into the flue gas at 280°C ~ 420°C and mix it evenly with it. Under the action of the catalyst, the nitrogen oxides in the flue gas are reduced to nitrogen and water. Among them, the un...

AI Technical Summary

Problems solved by technology

[0003] Conventional ammonia injection nozzles have a simple structure and a single injection angle. Generally, they spray directly from the top of the ammonia injection straight pipe. The ammonia injection speed fluctuates greatly, and the disturbance effect on the flue gas is poor. The distribution of the ammonia gas after it is injected into the flue and the The mixing of flue gas is not uniform, and the deviation of velocity distribution and ammonia concentration distribution is relatively large, resulting in unsatisfactory denitrification rate and ammonia escape rate

Images