Concentrated ammonia online dilution device for sncr denitrification system

Abstract

The invention discloses a concentrated ammonia water online dilution device for an SNCR denitration system. The concentrated ammonia water online dilution device comprises a diluter consisting of a shell and a center pipe at the longitudinal center of the shell, wherein an inlet pipe communicated with an inner cavity of the shell is arranged on the upper part of the outer wall of the shell, the lower end of the center pipe is an open end, and the upper end of the center pipe is connected with an outlet pipe communicated with a spray gun in a boiler furnace. The upper end of the shell is closed, and the lower end of the shell is connected with a slag storage pipe; a dilution water inlet is formed in the front end of the inlet pipe, a nozzle for spraying concentrated ammonia water into the inlet pipe is arranged on the side wall of the inlet pipe, dilution water and concentrated ammonia water are mixed and then enter a cavity between the shell and the center pipe to flow downwards in vortex, and after being further mixed, the mixture enters the center pipe, then is transferred into the outlet pipe, and finally enters the spray gun of the furnace for spray atomization. Paths for circulation of diluted ammonia water are all cavities, so that only very low pipeline loss can be caused, and the flowing speed of the mixture entering the gun spray is high, so that the atomization effect during the spraying of the gun spray is improved, and the denitration rate of the system for flue gas is improved. The cavity between the shell and the center pipe can also be used for removing impurities in the diluted ammonia water, thus avoiding clogging of the nozzle of the spray gun.

Description

technical field [0001] The invention relates to an SNCR denitration system, in particular to an online dilution device for concentrated ammonia water in the SNCR denitration system. Background technique [0002] SNCR denitrification uses the boiler furnace as the denitrification reaction device, and sprays dilute ammonia solution in the temperature range of 850°C to 1100°C. The concentration of purchased ammonia water is about 20%, and it needs to be diluted to a concentration of 10% before spraying. [0003] At present, the SNCR denitrification ammonia water dilution device basically adopts a double-layer pipe type or a structure with mixing blades in the pipe. They have two problems: first, the system resistance is too large, and the resistance between the double-layer pipes and the blades in the pipe cause the liquid flow. The resistance of the diluted ammonia water will affect the injection effect of the diluted ammonia water; the second is that the impurities in the dil...

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Problems solved by technology

[0003] At present, the SNCR denitrification ammonia water dilution device basically adopts a double-layer pipe type or a structure with mixing blades in the pipe. They have two problems: first, the system resistance is too large, and the resistance between the double-layer pipes and the blades in the pipe cause the liquid flow. The resistance of the diluted ammonia water will affect the injection effect of the diluted ammonia water; the second is that the impurities in the diluted water and ammonia water cannot be filtered before entering the nozzle of the furnace spray gun. Long-term use will make the nozzle easy to accumulate impurities in the solution and block the nozzle. Further reduce the atomization effect of dilute ammonia sprayed by the nozzle

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