Selective non-catalytic reduction（SNCR）

Introduction

Selective non-catalytic reduction (SNCR) is a technology that reduces NOx under 850-1100℃ without catalyst. The technology use the furnace as reactor, and can be adopted by remodeling the boiler. The operation is affected by reaction temperature, retention time, ammonia ratio and the degree of mixing of reductant and flue gas.

Main reaction

• NO/NO₂ + NH₃ + O₂ → N₂ + H₂O (reaction temperature 800-1100℃)

Advantages

1. Low investment and operation cost.
2. Lower denitrification efficiency ranging from 20 to 40%.
3. Require certain operating temperature. The Most suitable temperature is 900-1090℃.

Application

1. Boilers that don’t require high denitrification efficiency.

References