Denitration synergist and SNCR (selective non-catalytic reduction) denitration synergism method

Abstract

The invention discloses an SNCR (selective non-catalytic reduction) denitration synergism method and a denitration synergist. Some soluble metal compounds and accessory ingredients are added into an SNCR reducing agent to prepare the denitration synergist; when the reducing agent is sprayed into a hearth, metal oxides with SCR activity are generated in a high-temperature environment and have an effect ofcatalyzing reaction of NH3 and NOx; along with the flowing of smoke, SCR denitration reaction is realized, and the smoke is removed through a subsequent dust removal device. The denitration synergist is prepared from the following raw materials in parts by mass: 0.1-5.5 parts of ammonium metavanadate, 0.1-13.8 parts of tungsten trioxide, 0.1-18 parts of molybdenum trioxide, 0.1-27 parts of ammonium molybdate and 0.1-1.1 parts of copper hydroxide according to 100 parts of ammonia water. According to the SNCR denitration synergism method and the denitration synergist, the denitration reaction can be continued in a subsequent flue instead of being restrained within a temperature window of 850-1,100 DEG C, and can generate in a temperature window at 250-1,100 DEG C, so that the overall denitration efficiency is effectively improved, and extremely high industrial practicality is achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a denitrification synergist and a SNCR denitrification synergistic method. Background technique [0002] SNCR denitrification technology is a clean denitrification technology that sprays an amino-containing reducing agent into the furnace within a certain temperature range to reduce and remove NOx in the flue gas to generate nitrogen and water without using a catalyst. SNCR denitrification technology generally uses ammonia water as the reducing agent, NH 3 The reduction reaction with NOx is very sensitive to temperature conditions, and it is generally believed that the ideal temperature range is 850-1100°C, which varies with the type of reactor. SNCR technology has the advantages of simple economy, convenient operation, low price, etc., and has been widely used. However, when the temperature is lower than the temperature window, due to the limitation of the res...

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Problems solved by technology

[0004] The present invention provides a denitrification synergist and a SNCR denitrification synergistic method, which mainly solves the problem in the prior art that the temperature window still needs a medium and high temperature during SNCR denitration, and the temperature window is not wide; The oxygen content does not exceed 9%, and the oxygen content in the middle temperature zone is less than 17%. The process is more complicated and difficult to operate; moreover, the price of hydrazine as a rocket propellant is relatively expensive, the industrial application cost is high, and the practicability is not strong. Technical problems such as