SNCR Nox Reduction

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SNCR Nox Reduction

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  • SNCR Nox Reduction - 6-2
SNCR Nox Reduction
Model - 6-2
SELECTIVE NON-CATALYTIC REDUCTION

WORKING PRINCIPLE
SNCR NOx removal technology is to spray the reductant containing NH (such as ammonia, or ammonia urea) into the furnace temperature of 850-1100C region, the reductant rapidly thermal decomposition into NH3 and other byproducts, and then NH3 and NOx in SNCR reaction to produce N2.
NH3 is used as the reducing agent in the range of temperature from 850C TO 110C, the chemical reaction equation for reducing NOx is mainly as follows:
4 NH3 + 4 NO + O2 = 4 N2 + 6 H2O
4 NH3 + NO + 22 O2 = 3 N2 + 6 H2O
8 NH3 + 6 NO2 - 7 N2 + 12 H2O
Urea is the main reducing agent for NOx
The chemical reaction is
(NH4)2CO = 2 NH2 + CO
NH2 + NO - N2 + H2O
CO + NO + CO2 and N2
The reaction of SNCR reducing NO is very sensitive to temperature conditions. The selection of injection point on the furnace, namely the selection of the so-called temperature window, is the key to the efficiency of SNCR reducing NO. The ideal temperature range is generally considered to be 850C - 110C and varies with the type of reactor. When the reaction temperature is lower than the temperature window, due to the limitation of residence time, the chemical reaction is usually carried out to a low degree and the reaction is not thorough enough, thus resulting in a low reduction rate of NO. At the same time, the increase of NH3 not involved in the reaction will also cause ammonia gas leakage. When the reaction temperature is higher than the temperature window, the oxidation reaction of NH3 begins to play a leading role:
4 NH3 + 5 O2 = 4 NO + 6H2O
Thus, instead of reducing NO to N2, NH3 ACTS as oxidation and produces NO, in a word, the process of NO reduction by SNCR is the result of mutual competition and interaction between the above two types of reaction.
 
XIRI Light Energy Limited Corporation
6-2
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90out of 100based on 100user ratings
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6-1
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999999999 http://schema.org/InStock USD 2020-12-31
90out of 100based on 100user ratings
SELECTIVE NON-CATALYTIC REDUCTION TECHNOLOGY INTRODUCTION The selective non-catalytic reduction is an economical and practical NOx removal technology based on the principle that NH3 and urea [CO(NH2)2] etc, are used as reducing agents to atomize or vaporize heat injected into the boiler prior to injection into the boiler in the appropriate temperature range, ammonia or urea in the gas phase will be decomposed into free radicals NH3 and NH2, and at a specific temperature and in the presence of oxygen, the reductant reacts with NOx better than other reaction. So you can think of it as a selective chemical process. A reducing agent has a different reaction temperature range, which is called the temperature window, which has a great influence on the denitrification efficiency of this method.