Reducing NOx with SNCR and SCR systems using Ammonia Solution

Ammonia solution, also known as aqueous ammonia or ammonium hydroxide, means ammonia dissolved in water.  It can be used directly with SNCR and SCR systems.

Ammonia solution is safer to use than anhydrous ammonia since the vapor pressure is greatly reduced by the water.  Correctly handled and stored, it is a safe and efficient reagent for NOx treatment in emissions control technology for power plants/utilities. Yara is a world leader in ammonia, with one third of the Ammonia traded in the world coming from Yara.

For control of NOx Yara recommends the use of ammonia solution, where possible.

Why Ammonia Solution could be for you:

  • it is more efficient than urea and safer than anhydrous ammonia, offering a good compromise

  • the risks associated with the transport, storage and use of ammonia solution is significantly reduced compared to anhydrous ammonia as the ammonia is dissolved in water. This reduces the vapor pressure of the solution, which usually allows it to be stored at atmospheric conditions

  • ammonia solution does not freeze

  • compared to aqueous urea solutions, ammonia solutions are more effective in terms of transportation and storage; 125% NOxCare ammonia solution contains 9,5% more nitrogen than 40% NOxCare Urea Solution

Ammonia has advantages over urea when lower NOx emissions are required. Some of the advantages to be mentioned are:

  • Less tendency of formation of nitrous oxide and less carbon monoxide formation

  • More effective than urea in high temperature SNCR systems

  • Reduced probability of fouling and corrosion in equipment downstream of the injection point

  • Leakage of Urea solution leads to white salt precipitates giving an ageing look to your equipment

Ammonia solution transport includes:

  • Tank truck

  • Railcar

  • Vessel / Barge

If you have specific questions related to Yara's ammonia solution, please ask our NOx control expert.

Safety services

Ammonia is the ultimate, low cost  SNCR and SCR reagent , and safe when handled correctly. As Yara is the world’s largest ammonia producer and trader, we have decades of experience in safe and professional handling of ammonia. We do therefore also know that incorrect handling, by any reason, may have severe consequences.

To ensure that ultimate safety is maintained at all times, from production to consumption, we train our employees and contractors extensively, and keep up to date with latest techniques and processes. We are happy to share this knowledge and competency with our customers. 

We can offer a number of different safety related services, including:

  • Operator safety training or guidance
  • Manager level guidance and advice related to ammonia safety regulations, accident prevention, accident potential determination, and what to do if the unthinkable happens 
  • Pre-delivery site inspections, ammonia delivery pre-requisites 
  • Ammonia site safety assessment and recommendations 
  • Ammonia safety guidance to customers during HESQ systems development and maintenance 
  • Pre-audit or authority inspection preparations advice related to ammonia safety

Telemetry systems and safe storage for Ammonia Solution used for reducing NOx:

For peace of mind, Yara can offer to install telemetry systems on your storage facility. By using Yara’s telemetry system your reagent stock is constantly monitored remotely and Yara takes full responsibility to make sure your ammonia solution levels are always at the level set by you.

If you have specific questions related to Yara's ammonia solution, please ask our NOx control expert.

Read more about the storage solutions developed by Yara for safe and optimized storage of Ammonia Solution.

NOx Reduction Technology Reagents

Reliable Supply of NOxCare 40, Yara's high-purity urea solution, delivered globally, according to AUS40 ISO 18611 for maritime use during the operation of a vessel.

For queries, please contact:

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