Bleed air purging system of dual-fuel combustor nozzle itself

A bleed air purging system of a dual-fuel combustor nozzle itself comprises a bleed air hole, a bleed air branch pipe, a purging branch pipe, a control valve, a purging master pipe and a bleed air master pipe. The bleed air hole is formed in a combustor outer casing nearby a combustor inlet, pressure difference generated at the combustor inlet and in a flame tube by flow loss of a combustor itself serves as the driving force, and bleed air at the position of the combustor inlet is led to the dual-fuel combustor nozzle so as to achieve purging of residual fuel; the two ends of the bleed air branch pipe are connected with the bleed air hole and the bleed air master pipe respectively so that bleed air can be collected to the bleed air master pipe; the two ends of the purging master pipe are connected with the bleed air master pipe and the control valve respectively, and the two ends of the purging branch pipe are connected with the control valve and a fuel master pipe respectively; the bleed air is distributed through the control valve, and purging of different fuel channels of the dual-fuel nozzle is achieved. The bleed air purging system of the dual-fuel combustor nozzle itself has the advantages that an external air source does not need to be added, continuous purging is achieved, the structure is simple, maintenance is convenient, purging of the dual-fuel combustor nozzle is achieved, and coking is avoided.