sncr flue gas denitrification device using urea as reducing agent

Abstract

The invention discloses an SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as a reducting agent. The denitration device comprises a solid urea tank vehicle, a hose, a movable joint, a solid urea adjusting valve, a solid urea storing tank, a solid urea feeder, a compressed air main pipe, a compressed air adjusting valve, a stirrer, a urea solution preparing tank, aheater, an industrial water main pipe, an industrial water adjusting valve, a urea conveying pump, a urea solution storing tank, a urea spraying pump, a mixer, a urea reflux adjusting valve, a pressurized industrial water adjusting valve, an industrial water pump, a urea dilute solution adjusting valve, an atomization steam adjusting valve, an atomization steam main pipe and a urea spraying unit.During canning of urea, full-automatic and continuous feeding is realized, the concentration and uniformity of a urea solution are ensured, the urea flow is automatically adjusted according to the emission of NOx from combustion equipment, the emission of NOx from the combustion equipment is within a controlled range, and the denitration efficiency is 60 percent; and during supplying of bagged urea, the urea solution preparing tank is fed manually, and an intermittent urea preparing way is adopted.

Description

technical field [0001] The invention relates to a flue gas denitrification device, in particular to an SNCR flue gas denitrification device using urea as a reducing agent. Background technique [0002] In the field of flue gas denitrification, two methods, selective catalytic reduction (SCR) and non-selective catalytic reduction (SNCR), have been widely used. Both methods use NH 3 etc. as reducing agent, reducing NOx to harmless N 2 and H 2 O. The SNCR method is to spray a reducing agent aqueous solution such as ammonia or urea into the flue gas at 850~1150°C to realize the reduction reaction of NOx. Because it basically does not occupy the space of combustion equipment, the transformation workload is small, and the transformation period is short, so it has been widely used. Because urea has good stability, is non-toxic and harmless, has high safety and is easy to store, it is the best choice to use urea as the reducing agent in the SNCR method. Since urea is a solid p...

AI Technical Summary

Problems solved by technology

At present, the actual denitrification efficiency of SNCR technology is only about 30%, and corrosion of the water wall at the injection site has already occurred, which restricts the application of SNCR technology

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