Just Say Nox: The Application of Direct-Injection SCR for New and Retrofit Applications

Jeff Broderick, Director of Retrofit Sales for CECO, joined Just Say NOx to talk about Catalytic Reduction Systems and the pros and cons of SCR and SNCR re-agent options for these systems.

“The overall goal of both of these systems, whether it’s an SCR or SNCR system, is to reduce the NOx generated by a combustion source, such as boilers, gas turbines, or engines,” Broderick said. “The SNCR process is a higher temperature process that does not require a catalyst but is slightly less efficient. The SCR process uses a catalyst to mix the exhaust and ammonia, and it is a much more efficient reaction, but it happens at a lower temperature.”

Safety, availability, environment and cost are all factors when choosing a system that utilizes either ammonia, hydrous ammonia or urea.

Before selecting the right method for NOx reduction, it is essential to consider all aspects and potential safety hazards.