NOx Reduction

If you want to reduce your NOx emissions up to 85%, we offer you AET SNCR DeNOx System. If you want to reduce your NOx emissions up to 98%, we offer you AET SCR DeNOx System.

AET SCR DeNOx System

The Selective Non-Catalytic Reduction (SNCR) utilises the reduction capacity in the reducing media, e.g. urea or ammonia water. This media is injected, as an aqueous solution, in the furnace at temperature range of 850 - 1090 °C.

 

Important parameters for successful implemen­tation and a cost effective solution are:

  • Injection nozzle: design and position

  • Temperature at injection point(s)

  • Boiler operation

  • Fuel variation

  • Boiler fouling

  • Reaction time for media

  • Reaction media

  • Automation level.

In order to obtain a good NOx reduction, the aim is to attain a consistent distribution of the reducing media over the cross section of the furnace and at the right temperature throughout the furnace. The chemical NOx reduction process can be described in several ways. Some of the main consequences the NOx reduc­tion process are described below.

 

For the processes with ammonia water and urea both the optimal temperature and sufficient reaction time is critical. If the reagent is injected at too low a temperature, the nitrogen oxides (NOx) will not react with NH2÷ and high NH3 emissions will occur in the flue gas. If the reagent is injected at too high a temperature, the NH2÷ reacts with O2 and not with nitrogen oxides (NOx), cau­sing the NOx not to be reduced significantly. Ammonia water generally has a short reaction time, whereas the urea has a longer reaction time.

 

The advantages with AET SNCR DeNOx System:

  • High NOx reduction: up to 85%

  • Low operating costs: e.g. low cost reagent, long lasting equipment, limited maintenance

  • Low CAPEX

  • Flexible scope

  • Easy and quick to integrate in existing boiler plants

  • Utilisation of AET's boiler experts.

AET SCR DeNOx System

The Selective Catalytic Reduction (SCR) works by injecting ammonia water, which is vaporised and fed into the flue gas. The evaporated ammonia water will then pass the catalyst elements, whereby NOx in the exhaust gas is transformed into nitrogen and water.

 

The AET SCR DeNOx System can be made as a hybrid SCR-SNCR solution (AET SNCR DeNOx System with a catalyst) or as genuine SCR solution. The choice can depend on

  • Emission criteria: NOx, CO, NH3

  • Boiler construction

  • Boiler operation

  • Fuel variation

  • Boiler fouling

  • Reaction media

  • Automation level.

The advantages with AET SCR DeNOx System:

  • Extreme high NOx reduction: up to 98%

  • Low CO emissions

  • Low NH3 slip

  • Low operating cost: e.g. low reagent consumption, long lasting equipment

  • Utilisation of AET's boiler experts.

AET SNCR DeNOx System

 

Contact our Service Department to get assistance.

NOx reduction up to 60% with AET SNCR DeNOx System.

NOx reduction up to 85% with AET SNCR DeNOx System.

NOx reduction up to 98% with AET SCR DeNOx System.

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  • Aalborg Energie Technik a/s
  • Alfred Nobels Vej 21 F
  • 9220 Aalborg East, Denmark
  • Tel +45 96 32 86 00
  • aet@aet-biomass.com