NOx reductions through SNCR technology
The selective non-catalytic reduction of reducing NOx emissions works by injecting the reagent directly above the combustion where the temperatures are between 850oC and 1050oC. This technology is widely used in cement, waste incinerators, biomass boilers or boilers using conventional types of fuel. SNCR is a common method of reducing NOx emissions because it is more cost effective and it is designed for optimum performance. The cost of investment on SNCR technology is extremely low compared to other technologies. It can be installed on your site in a matter of days because the system is pre-assembled and has been pre-tested. The key parameters to ensure an efficient reduction in NOx emissions are:
- Design and performance of the injectors
- Optimization and programming of the controller
- Location of injection points
- Temperature window at injection points
- Choice of the reagent
- Possible residence time
Reduction of NOx emissions through SCR and EGR technology
Different technologies are being applied by the auto industry in order to control and reduce NOx emissions and among the key technologies being implemented are SCR technology and exhaust gas recirculation (EGR). In the EGR system, combusted exhaust gas is re-circulated back into the air intake to dilute the incoming fuel/air mixture to reduce combustion temperatures to below the 1300 plus Centigrade peak at which nitrogen oxide is formed. In order to meet emission standards, most modern vehicles make use of EGR technology.
SCR systems convert nitrogen oxide into nitrogen, water and insignificant amounts of carbon dioxide by injecting urea into the catalyst of the diesel engine exhaust stream where it is expelled through the tailpipe. It is proven that NOx emissions can be reduced by 90% and more through the SCR technology and can be combined with diesel particulate filter for further reduction of emissions. SCR technology is used by several engine manufacturers so that heavy duty trucks and vehicles will be compliant with the regulations on the reduction of nitrogen oxide emissions.
Reduction of nitrogen oxide emissions through diesel particulate filter
Diesel particulate filters remove pollutants from the diesel exhaust through filters that can be installed on vehicles and off-road diesel engines. The key to ensuring that pollutants will be filtered successfully is to ensure that the filter is cleaned regularly and for the vehicle to be properly maintained. However, a more practical method has been designed by engineers through regeneration where the pollutants are burned into ash under all vehicle operating conditions. On the other hand, if diesel particulate filter is combined with either SCR or SNCR technology, it can achieve more significant reductions to particulate matter and NOx emissions.