What is Hybrid ?
Hybrid systems utilizes both SNCR and SCR systems. Typically the SNCR system is utilized to reduce only a portion of the NOx while the NH3 slip is purposely kept high. The remaining NOx is reduced by the downstream SCR catalyst. This catalyst is referred to as a ‘slip breaker’ because it utilizes the unabsorbed NH3 from the SNCR system.
Major advantage of the Hybrid system is that the SCR catalyst volume can be significantly reduced (up to 50% reduction) compared with a conventional SCR system.