Abstract: A mixed gas containing NH3, CO, N2 and air with different ratios was used for the simulation study of NH3 transformation at high temperature in CO boiler of incomplete regeneration FCC unit. The results show that nearly 30%-45% NH3 are transformed into NOx at 975 ℃, and the yield of NOx increases with the increase of O2 concentration at outlet of the boiler. The existence of CO in the mixed gas decreases the generation of NOx. The higher combustor temperature and the higher CO concentration can reduce NOx emission significantly.

Key words: catalytic cracking, incomplete regeneration, CO boiler, NH3, NOx