Low nitrogen oxide combustor

The utility model relates to a low nitrogen oxide combustor, including casing, one -level fuel rifle, second grade fuel rifle and combustion -supporting wind transmission path, one -level fuel rifle is followed the axial extension of casing is passed the inner chamber of casing, the one of which end position is in being close to the position of the axial tip of casing, second grade fuel rifle is followed the axial extension of casing, and lie in the circumference outside of one -level fuel rifle, the fuel output of one -level fuel rifle and second grade fuel rifle is located same radial plane, clearance in the casing between one -level fuel rifle and the second grade fuel rifle constitutes combustion -supporting wind transmission path. The utility model provides a self circulation can be realized to flue gas among the low nitrogen oxide combustor, realizes the fractional combustion, and flame stability is good, has also played the effect that reduces combustion zone oxygen concentration and temperature simultaneously, very big suppression NOx's production.