Post Conversion

One of the technologies, LP Amina deploys for reducing nitrous oxides created during coal conversion for power generation is a Selective Non-Catalytic Reduction process. The SNCR process is conceptually a simple process. A nitrogen containing reagent (i.e., ammonia (NH3), urea (NH2CONH2), or cyanuric acid (HNCO3) is injected into combustion products at the proper temperature. The reagent selectively reacts with NOx in the presence of oxygen forming primarily N2 and H2O. The fact that the reagent reacts with NOx and not O2 is what makes the process “selective”. While the SNCR process appears simple, implementation of this process entails a number of challenges. These challenges arise primarily due to the relatively narrow temperature window over which the chemicals selectively react with NOx and, perhaps more importantly, the fact that one is asking the furnace to also serve as a chemical reactor. The major process parameters impacting SNCR performance include:

1. SNCR chemical type
2. Amount of chemical injected
3. Temperature
4. Residence time
5. Initial NOx level
6. Trace gas species concentration