Selective non-catalytic reduction

Selective Non-Catalytic Reduction

Selective non-catalytic reduction

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Description:
Selective Non Catalytic Reduction (SNCR) is a method to lessen nitrogen oxide emissions in conventional power plants that burn biomass, waste and coal. The process involves injecting either ammonia or urea into the firebox of the boiler at a location where the flue gas is between to react with the nitrogen oxides formed in the combustion process. The resulting product of the chemical redox reaction is elemental nitrogen (N<sub>2</sub>), carbon dioxide (CO<sub>2</sub>), and water (H<sub>2</sub>O).

Urea (NH<sub>2</sub>CONH<sub>2</sub>) is easier to handle and store than the more dangerous ammonia (NH<sub>3</sub>). In the process it reacts like ammonia:

NH<sub>2</sub>CONH<sub>2</sub> + H<sub>2</sub>O -> 2NH<sub>3</sub> + CO<sub>2</sub>


The reduction happens according to (simplified)Duo et al., 1992 Can. J. Chem. Engng, 70, 1014-1020

4 NO + 4 NH<sub>3</sub> + O<sub>2</sub> -> 4 N<sub>2</sub> + 6 H<sub>2</sub>O


The reaction mechanism itself involves NH<sub>2</sub> radical that attach to NO and then decompose.

The reaction requires a certain temperature range to be effective, typically , otherwise the NO and the ammonia don't react. Ammonia that hasn't reacted is called ammonia slip and is undesirable, as the ammonia can react with other combustion species, such...
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