Biomass tempering burner device for blending combustion of pulverized coal furnace

The biomass tempering burner device for blending combustion of the pulverized coal furnace comprises a spiral tempering device and a fuel spray pipe, the spiral tempering device comprises a heat preservation shell, a flue gas channel and spiral fins, the flue gas channel and the spiral fins are located in the heat preservation shell, and the flue gas channel is rotationally arranged; an inlet of the flue gas channel is used for being communicated with a high-temperature flue gas outlet of the boiler, a discharging hole used for discharging a biomass gas-solid mixture is formed in the tail end of the flue gas channel, the spiral fins are arranged in the length direction of the flue gas channel, and a spiral tempering channel is formed between the spiral fins and the inner wall of the heat preservation shell. A biomass feeding hole is formed in the spiral tempering device; the fuel spray pipe is arranged at an outlet of the spiral tempering device, and the outlet end of the fuel spray pipe is used for being com