SNCR Selective Non-catalytic Reduction

Selective non-catalytic reduction means that under the action of no catalyst, a reducing agent is sprayed into the "temperature window" suitable for denitration reaction to reduce the nitrogen oxides in the flue gas to harmless nitrogen and water. This technology generally uses ammonia, urea or hydrogen acid injection in the furnace as a reducing agent to reduce NOx.

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The SNCR using ammonia as the reducing agent is called the De NOx method, and the urea as the reducing agent is the NOxOUT method.
Using NH3 as the reducing agent, the chemical reaction equation for reducing NOx in the temperature range of 900°C to 1 100°C is mainly:
4NH3 + 4NO+ O2 →4N2 +6H2O
4NH3 + 2NO+ 2O2 →3N2 +6H2O
8NH3 + 6NO2 →7N2 +12H2O
The main chemical reaction for reducing NOx using urea as a reducing agent is:
CO(NH2 )2→2NH2 + CO
NH2 + NO→N2 + H2O
CO + NO→N2 + CO2
SNCR is often used in boiler furnaces to reduce NOx emissions to about 200mg/Nm3. On the basis of the reductant preparation, dilution, injection and control system of the SNCR system in the furnace, a flue gas tail denitrification device (SCR) is installed to form a combined SNCR/SCR denitrification process.

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