The invention discloses a fuel and air mixing device for a low-
pollution burning chamber of a gas
turbine. Fuel comprises a main burning level and a duty burning level; and air is supplied by a three-stage
cyclone. The fuel and air mixing device is characterized in that the central duty level adopts diffusive burning, and the
peripheral main burning level adopts premixing or semi-premixing burning. The central duty level consists of a centrifugal atomizing
nozzle and first-stage
cyclone air; and the rotating directions of the first-stage
cyclone air and second-stage cyclone air are opposite. The fuel of the main burning level is supplied by a multipoint direct-injection type
nozzle, the air is respectively supplied by the second-stage cyclone air and third-stage cyclone air, and the rotating directions of the second-stage cyclone air and third-stage cyclone air are opposite. The central duty level is used when in low working conditions such as starting and slowing and the like, so that the stable burning range can be widened, the burning efficiency can be improved and the emission of CO and UHC is reduced; and when in large working conditions, the duty level and the main burning level work simultaneously, the duty level provides a stable ignition source for the main burning level, a main burning area is in a lean-oil state, and the temperature is far lower than the temperatureof insulated
flame, so that the emission of
NOx under the large working conditions can be obviously reduced. The fuel and air mixing device can be used for an aerial gas
turbine engine or an
industrial gas turbine.