Denitration agent used for SNCR flue gas denitration technology

Abstract

The invention relates to a denitration agent used for a SNCR flue gas denitration technology. The denitration agent comprises the following components: RO pure water, vehicle urea, liquefied ammonia or ammonia liquor, and a few of an additive. A preparation method comprises the following steps: employing RO pure water for hydrolyzing the vehicle urea, liquefied ammonia or ammonia liquor and the additive are placed in an above solution; wherein the concentration of the vehicle urea in the prepared denitration agent is 20-30%, and the ammonia concentration is 3-7%. The preparation method of the denitration agent is simple, the denitration agent can increase the denitration efficiency, ammonia escape and ammonia blast possibility can be prevented, the severe condition required by ammonia liquor storage and transport can be solved, the environment damage is reduced, and the problems of easy obstruction of the used urea and low denitration efficiency are solved.

Description

Technical field: [0001] The invention relates to the technical field of flue gas denitrification, in particular to a denitrification agent for SNCR flue gas denitrification process. Background technique: [0002] At present, the reducing agent (denitrification agent) used in the denitrification process is liquid ammonia, ammonia water or urea. Liquid ammonia or ammonia water requires harsh storage conditions, and when used, the ammonia escape rate is high, there is a hidden danger of ammonia explosion, and there is a lot of ammonia in the ash residue , the denitrification efficiency is low, and affects the environment; while the urea denitrification efficiency is low, and the nozzle is easy to be blocked, and improper control may easily cause scarring on the water wall of the boiler or outside the buried pipe. Invention content: [0003] The purpose of the present invention is to provide a kind of denitrification agent for SNCR flue gas denitrification process with the abo...

AI Technical Summary

Problems solved by technology

[0002] At present, the reducing agent (denitrification agent) used in the denitrification process is liquid ammonia, ammonia water or urea. Liquid ammonia or ammonia water requires harsh storage conditions, and when used, the ammonia escape rate is high, there is a hidden danger of ammonia explosion, and there is a lot of ammonia in the ash residue , the denitration efficiency is low, and affects the environment; while the urea denitration efficiency is low, and it is easy to block the nozzle, and improper control may easily cause scarring on the water wall of the boiler or outside the buried pipe