SCR technology for reducing NOx emissions

Selective catalytic reduction (SCR) is a method used to reduce the level of nitrogen oxides (NOx) with the help of a catalyst.

SCR technology can achieve 98% NOx reduction in combustion processes and can meet stricter incoming legislation. It is the optimum NOx control system used by environment-friendly power plants and industrial applications that have to meet stringent environmental controls. 

Why choose SCR? 

With SCR technology:

  • The temperature of the flue gas is much lower than in SNCR systems
  • NOx reduction is up to 98% 
  • A catalyst is needed to reduce nitrogen oxides with the help of a reducing agent (Anhydrous Ammonia, Ammonia Solution, Urea Solution)

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

Reagent quality and security 

When choosing SCR technology it is also important that you choose a reliable reagent supplier for ammonia or urea. 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.  

Why choose Yara for your SCR system and reagents?

Yara Environmental Technologies have installed more than 1,300 SCR systems around the world in cogeneration plants, industrial boilers and ships. 

Yara SCR systems are marketed by Yara Environmental Technologies - Yara’s center of competence for basic / detail engineering and turnkey solutions of SCR & SNCR DeNOx systems. 

You can rely on Yara thanks to our experience producing and delivering its reagents for over 20 years. Our unique network of production plants enable a constant back-up in sourcing, thus guaranteeing you both supply and quality.


Preventative maintenance services for SCR systems 

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

To ensure you can optimize uptime, and prevent normal wear and tear of components disrupting processes through unexpected shutdowns, we also offer our customers an agreed Maintenance Service package.

What you get

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

By choosing a Maintenance Service package you will benefit from

  • Prioritized service visits, and priority emergency service 
  • Optimum utilization of your SNCR system, and maximum uptime 
  • No maintenance service administration – it is all done for you

Spare parts services for SCR systems

To ensure a good service for customers, we keep a stock of standard consumables and spare parts for your hybrid system.

Ordering direct from Yara ensures you receive the correct component, compatible with your SCR system, delivered quickly and efficiently.

You can also choose a spare part package that provides you with the expected yearly consumption of "normal wear and tear" components, ensuring even faster and easier access to your necessary parts.

NOx control reagent storage solutions for SCR systems

If you need a storage solution for your NOx reduction reagents (Ammonia, Ammonia Solution and Urea Solution) needs we can help. It can form part of your SCR installation, or be a stand-alone storage tank solution. We can offer you design, build and upgrade of storage solutions as required.

You can also get an optimization assessment of your current reagent usage, as part of our service offer. If your reagent situation changes, we can recommend and deliver, standardized or customized, NOx reduction reagent storage solutions and internal site distribution solutions, to your NOx control installations.

NOx reduction reagent storage services include

  • Upgrades to larger storage capacity
  • Converting from one reagent solution to another (e.g. anhydrous ammonia to ammonia solution)
  • Re-piping of site reagent supply system
  • On-site dissolving (urea) or dilution installations 

Cement plant

Choice of systems for exhaust gas treatment

Contact us

Wolfgang Kurka
Wolfgang Kurka
Sales Department – Global

SCR Industrial

Christian Lechner
Christian Lechner
Sales Department – Global

SCR Power Plants