Temperature and emissions characteristics of a micro-mixing injection hydrogen-rich syngas flame diluted with N2

Micro-mixing injection combustion is an effective way to reduce the NOx emissions of gas turbine, but it can also cause high temperature near the burner's nozzle. In this paper, micro-mixing injection combustion and N2 dilution were combined to resolve this problem. The results indicate that this method not only reduces NOx emissions effectively but also protects the nozzles by lowering the temperature of the flame and that near the nozzle. The larger the dilution amount, the lower the temperature and NOx emissions could be. Under various experimental operating conditions, NOx emissions could be reduced to less than 6 ppm (@15% O2), which is lower than the emissions of most conventional gas turbine burners. According to the characteristics of temperature and NOx emissions, it seems the Zeldovich route is not the control route for the flame. With most of the flames, the CO emission hardly changed and remained at a relatively low level within almost 6 ppm (@15% O2).