AET is an experienced manufacturer of boilers and Selective Non-Catalytic Reduction (SNCR) plants. AET has the knowledge of integrating these systems and can reduce NOx emissions up to 85% with an AET SNCR DeNOx System.
In Europe, new legislation, in accordance with the IPPC Directive, impose new values that must be complied with in terms of reducing atmospheric emissions. Special attention is given to reducing NOx emissions.
NOx-emission criteria in the new Medium Combustion Plants (MCP) and Large Combustion Plants (LCP) are valid from 1 MWt and upwards. The required NOx emission limit values can be lowered even further, in case EU limits for air quality are superseded.
The SNCR technology is a method used to reducing the NOx emissions by injecting a reagent in the post combustion chamber, optimally at a temperature range of 850 - 1090 oC.
When buying an AET SCNR DeNOx System, you also get access to the know-how of AET employees, who have more than 30 years of design and hands-on experience with boilers fired with biomass, coal, oil, gas and waste.
An AET SNCR DeNOx System is both cost effective, highly efficient and has a high availability.
The investment for an AET SNCR DeNOx System is low compared to Selective Catalytic Reduction (SCR). Furthermore, an AET SNCR DeNOx System can often be installed within a few days, as the system is skid mounted in modules and thoroughly tested, resulting in an extremely high availability.
The AET SNCR DeNOx System is made from stainless steel, as the injection reagent can cause corrosion. Although this is more costly, it presents numerous benefits to the operating and maintenance team, as very little wear and tear is seen.
Important parameters for successful implementation and a cost effective solution are:
Injection nozzle: design and position
Temperature at injection point(s)
Reaction time for media
At optimal process conditions, the AET SNCR DeNOx System can reduce up to 85% of the NOx emissions in biomass-fired and fossil fuel-fired boilers.
AET is flexible in the approach to scope of supply and a full turnkey AET SNCR DeNOx System can include:
Reducing agent storage tank
Mixing and dosing unit
Lances (levels, interaction)
Nozzles (types, angling)
On-line temperature measurement in furnace
Emission measurement (NOx, CO, NH3)
PLC control system
On the right hand side, you can see different configurations of the AET SNCR DeNOx System.
For an existing boiler, an on-site test is recommended, which can include temperature measurement in the furnace and preliminary NOx-reduction test with a test kit.
AET has a mobile SNCR test kit, to be used for testing in your boiler. With this unit, we can make a technical and environmental test at your site. The test can be made with short notice and will only take a few days. After this test, we are able to predict the emission reduction and the process behind it.
The on-site test can be supplemented by a CFD calculation as well as a boiler performance calculation in order to foresee furnace temperature at different loads, fuels etc.