Reduction of nitrogen emissions by selective catalytic reduction

The SCR technology used will reduce the nitrogen oxide emissions already produced during the combustion of the fuel inside the boiler. The coal combustion flue gases, into which an aqueous ammonia solution is controlled by SCR, are fed into the catalyst where the final chemical reaction takes place. The difference between SCR and the more commonly used non-catalytic SNCR method is that the SCR method will guarantee the required emission limits during continued operation of the boilers with a significantly lower residual ammonia content in the flue gas. The efficiency of the SCR technology itself is theoretically around 80-90% in terms of NOx reduction in the exhaust gas.