SCR technology for reducing NOx emissions

Selective Catalytic Reduction (SCR) is a method to reduce the level of nitrogen oxides (NOx) with the help of a catalyst.  SCR technology can achieve more than 95% NOx reduction in combustion processes and can meet stricter incoming legislation.  It is the absolute NOx control system.

With SCR technology:

  • the temperature of the flue gas is much lower than in SNCR systems

  • a catalyst is needed to reduce nitrogen oxides with the help of a reducing agent ( anhydrous ammonia, ammonia solution, urea solution)

  • The NOx and ammonia enter the catalyst, causing the NOx to react with the ammonia to produce elemental nitrogen and water.

When choosing SCR technology it is also important that you choose a reliable reagent supplier for ammonia or urea to ensure you are always meeting your legal requirements in terms of NOx emission reduction. Furthermore the quality of the reagent is particularly important to meet the strict demands of your catalyst supplier to ensure a long and maintenance free life-time of your catalyst. Yara has been producing and delivering its reagents to clients for over two decades from our unique network of production plants which offer a constant back-up in sourcing, thus guaranteeing both supply and quality.

When choosing how to reduce NOx emissions, the feasibility and the economy of SNCR technology should also be investigated.  The investment cost of an SNCR system is only a fraction of a complete SCR installation.

Read more on Yara's SNCR systems for reducing nitrogen oxide emissions.

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