Combustion nozzle with internal cooling channel and external cooling channel for gasifying powdery carbon fuel

The invention discloses a combustion nozzle with an internal cooling channel and an external cooling channel for gasifying a powdery carbon fuel, which is used for partially combusting (gasifying) the powdery carbon fuel and an oxygen-containing gas in a combustion area. The combustion nozzle with the internal cooling channel and the external cooling channel for gasifying the powdery carbon fuel comprises a central channel with an outlet; the internal cooling channel surrounding the central channel is arranged outside the central channel; an annular channel with an air supply opening is arranged outside the internal cooling channel; and the external cooling channel is arranged outside the annular air supply channel. In the invention, the internal and the external cooling channels greatly improve the cooling effect on the combustion nozzle with adequate and reliable cooling, and the long service life of the combustion nozzle is ensured.