Recent years have seen the development of hybrid systems for NOx reduction, using a combination of SCR and SNCR technologies. These hybrid systems reduce the level of nitrogen oxides (NOx) in the flue gas with a hydrocarbon treatment in 2 stages: selective non-catalytic reduction (SNCR), followed by selective catalytic reduction (SCR).
Why choose a hybrid SNCR/SCR system?
A hybrid system may be an interesting alternative versus installing a single SCR system. Hybrid systems help to find a balance between investment costs (CAPEX) and operating costs (OPEX). This is particularly useful for cases where:
- A significant reduction in NOx emissions is expected, yet flexibility of operation is needed.
- The installation space available for the catalyst is restricted.
- Increasing the pressure drop is critical or leads to higher operational costs and significant investments.
In such cases, the hybrid solution is the best choice: it reduces the size of the catalyst to be installed, thus reducing investment, and volume issues at the site.
If you have questions about SCR/SNCR hybrid systems, please contact our experts on NOx control.