SNCR - The Selective Non-Catalytic Reduction process
introduces a reducing agent into high temperature flue gas. The spontaneous
reaction between reagent and nitrogen oxides then forms nitrogen and water.
Wall injectors can be used for reagent injection, except on large utility
boilers, where an injection lance may be needed to distribute the reagent
SNCR is a cost-effective technique to provide medium range
NOx reduction. Because of its simplicity and high reliability, capital and
operation costs are low. If used in combination with other control techniques
such as low NOx burners or combustions modifications, it can be an attractive
alternative to SCR. When used as a first stage in a hybrid SNCR/SCR system,
SNCR can reduce catalyst size.
DNX Engineers, Ltd. provides engineering , design
services and supplies engineered systems to the power and process industry.
Our specialty being the control of Nitrogen Oxide (NOx)