Industrial Solutions

Which Reagent is best for me?

As the world leader in nitrogen chemistry, Yara is uniquely positioned to provide a reliable supply of NOx reduction reagents such as anhydrous ammonia, ammonia solution and urea solution. Yara can deliver the reagent of your choice from our extensive network of plants offering continuous sourcing back-up. Our product knowledge in urea and ammonia helps Yara bring the reagent into your processes in a safe and reliable manner.

Why Anhydrous ammonia could be for you:

Anhydrous ammonia is the total NOx reduction reagent and has advantages over ammonia solution and urea when lower NOx emissions are required.

With proper storage, correct handling and competence regarding ammonia properties, this reagent can be safely used to turn NOx into harmless nitrogen and water in your SCR system.

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. Compared to aqueous urea solutions, ammonia solutions are more effective in terms of transportation and storage as 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.

Why Urea could be for you:

You may wish to choose urea for safety reasons. It poses less risks in the workplace and doesn’t require specific training, unlike ammonia. Urea is non hazardous. It is stable, non volatile, non explosive and non flammable. It can be safely transported, stored and handled without the need for specific training, however, it is the least efficient of the 3 reagents offered.

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

Anhydrous Ammonia
Ammonia Solution
Urea
  • Product contains 100% reactive component, thus offers highest efficiency and lowest transport cost
  • Less tendency of formation of nitrous oxide and less carbon monoxide formation
  • Urea can lead to additional nitrous oxide or carbon monoxide emissions (poisonous gases)
  • Less tendency of formation of nitrous oxide and less carbon monoxide formation
  • More effective than urea in high temperature SNCR systems
  • It is less effective than ammonia
  • More effective than urea in high temperature SNCR systems
  • Reduced probability of fouling and corrosion in equipment downstream of the injection point
  • There is an increased probability of fouling and corrosion in equipment downstream of the injection point
  • 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
  • Leakages of urea solution leads to white salt precipitates giving an ageing look to your equipment
  • Leakage of Urea solution leads to white salt precipitates giving an ageing look to your equipment
  • Ammonia solution does not freeze
  • Scaling and clogging when blended with hard water for deNOx operation
  • Urea solutions must be provided with sufficient heat to avoid freezing. The freezing point is dependent on the concentration with 40% starting to freeze at 0°C

Yara is the largest ammonia and urea producer in the world, offering a unique Reagent back-up supply. Our NOx control experts can provide you with technical support and advice to ensure that your SCR or SNCR NOx control system is cost efficient and meets all the requirements needed. Yara delivers the reagent of your choice from our unique network of plants offering a constant back-up in sourcing.

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