Hitachi has developed a dry Iow NOx combustor for the gas turbinę in the advanced combined-cycle using multi-stage fuel nozzles FI and F2 . FI diffuses the fuel over the whole power rangę of the gas turbinę while F2 diffuses fuel/air combustion mixture from the mid to full-load rangę. With this system, NOx ievels are approximately 25% of a conventional system.