Self-cyclone water and gas coaxial spraying nozzle and application method thereof

The invention relates to a self-cyclone water and gas coaxial spraying nozzle and an application method thereof. The self-cyclone water and gas coaxial spraying nozzle comprises a sewage self-cyclonespraying pipe, a nano bubble energy storage pipe, a nano bubble spraying pipe, a mixing pipe and a mixed solution self-cyclone spraying pipe, which are arranged coaxially, wherein two ends of a pipe opening of the nano bubble spraying pipe are connected with the nano bubble energy storage pipe and the mixing pipe respectively; the mixing pipe is connected with the mixed solution self-cyclone spraying pipe; the sewage self-cyclone spraying pipe penetrates through the nano bubble energy storage pipe and extends into the nano bubble spraying pipe; a pipe wall of the self-cyclone spraying pipe isprovided with a sewage spiral flow path; a decompression and diffusion section is further arranged at an outlet end part, close to the nano bubble spraying pipe, of the self-cyclone spraying pipe; thedecompression and diffusio