Influencia de la construcción del sistema de recirculación de los gases sobre la formación de nox en un generador de vapor de 350 MW

The paper presents the results of a study on the formation of NOx in a 350 MW steam generator that burns fuel oil. The objective of this work was to determine the NOx formation applying two different constructions of recirculation gases. The first construction has the introduction of recirculation gases in the bottom of the furnace and the second one involves injection of recirculation gases in the hot air duct. In both cases, the study was developed at different thermal loads, maintaining constant the fractions of recirculation gases for each thermal load. The results show that the introduction of recirculation gases in the hot air duct reduces NOx formation by 58 % compared to those obtained with the traditional method of injection of gases in the bottom of the furnace.