ВЛИЯНИЕ ИНТЕНСИВНОСТИ КРУТКИ ВОЗДУХА В ВИХРЕВЫХ ГОРЕЛКАХ НА ВЫДЕЛЕНИЕ ОКСИДОВ АЗОТА В ПРОМЫШЛЕННЫХ ТРУБЧАТЫХ ПЕЧАХ

Abstract

An important task in the design and operation of industrial furnaces is to reduce the formation of harmful substances, in particular, nitrogen oxides (NOx), directly at the source of their occurrence. One of the promising methods of reducing the concentration of NOx in the gas emissions of furnaces is the use of vortex burners with a twist of the flow, providing better mixing of combustion products, thereby reducing the maximum local temperatures in the furnace and equalizing the temperatures over the working volume. However, the available information on the effect of vortex formation on the intensity of nitrogen oxides release is extremely contradictory – depending on the design of the burners and the furnace, the twist of the flow can both increase and decrease the formation of nitrogen oxides. Moreover, single burners have been studied at least in some way from the point of view of NOx release, but their interaction with each other in large-volume furnaces has not been practically investigated and requires additional study. By numerical experiments conducted on the basis of the mathematical model developed by us, it is shown that the smallest release of nitrogen oxides is ensured by the use of burners with a twist of the air flow (oxidizer), as well as their combination with two-stage combustion when the burners are located in the same horizontal plane. It is shown that the combined use of these two methods reduces the release of nitrogen oxides in the furnace by more than a factor of ten.