Sänkning av kväveoxidemissioner samt förlängd livslängd genom rökgasåterföring i en pelletsbrännare 750 kW

The project has been involved in developing a flue gas recirculation system aimed at reducing emissions of NO x and dust, as well as extending the life of the material in a pellet burner. Installation of a flue gas recirculation system and combustion tests have been performed in a laundry in Bengtsfors, which has a pellet-fired boiler with two janfire burners of 750 kW each. The results of the tests showed that the flue gas recirculation had an impact on NOx emissions. These decreased by about 17-18% in wood pellets combustion and by 10% in combustion of nitrogen rich agro fuel pellets in comparison to non-flue gas recirculation. With flue gas recirculation, the combustion furnace temperatures decreased by 85-105 oC for wood pellets and about 70 oC for agro fuel pellets.