Hybrid SNCR/SCR Systems for NOx reduction

In recent years, new NOx control hybrid systems, using a combination of SNCR and SCR technology, have been developed. These hybrid systems reduce the level of nitrogen oxides (NOx) in fossil fuel combustion flue gas with a selective non-catalytic reduction (SNCR) treatment stage followed by a selective catalytic reduction (SCR) treatment stage.

The hybrid technology can be a cost effective compromise with the SNCR and SCR system reducing NOx, balancing capital and operating costs. In applications where a high NOx removal is required, space is limited and low CAPEX is required, a hybrid solution can be the optimal choice as the catalyst volumes can be reduced compared with a full SCR system.

Yara Environmental Technologies (previously known as Petro Miljö) is a world leader in SNCR systems, with over 200 installations around the world.  We have installed hybrid system at client sites, and can design a tailor-made hybrid system for you.

Preventive maintenance services

Yara SNCR systems are built to operate and perform in tough industry environments. Our robust systems operate as specified and with minimal interruption.

However, to optimise uptime, and prevent normal wear and tear of components disrupting processes through unexpected shutdowns, we offer our SNCR customers a Maintenance Service package.

This comprises of:

  • Preventative maintenance visits
  • Replacement of consumables and spare parts
  • System adjustments and optimization

and all according to prior agreement with the customer.

A Maintenance Service package gives you the advantages of:

  • Prioritized service visits, and priority emergency service
  • Optimum utilization of your SNCR system, and maximum uptime
  • No maintenance service administration, we do all that for you

Spare parts services


We keep a stock of standard consumables and spare parts for your SNCR system. Ordering direct from Yara ensures that you receive the correct component, compatible to your SNCR system, delivered quickly and efficiently. We can also offer a spare part package, which contains the expected yearly consumption of “normal wear and tear" components, ensuring even faster and easier access to your necessary parts.

Read more on Yara's leading SNCR systems.

Should you have any questions about hybrid SCR/SNCR systems, please ask our SCR/SNCR NOx control expert.

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