Boiler combustion system who possesses flue gas backward flow function

The utility model provides a boiler combustion system who possesses flue gas backward flow function includes: the boiler, a wind channel for $facing the boiler provides wind one time, a secondary air duct for $facing the boiler provides the overgrate air, a cold wind return circuit for $facing the boiler provides pressure cold wind, the pipeline of discharging fume that links to each other with the boiler exhanst gas outlet, the setting is in a wind channel and discharge fume first flue gas return circuit between the pipeline, the setting is in secondary air duct and discharge fume second flue gas return circuit between the pipeline. Through flowing back the flue gas extremely wind channel and secondary air duct for in the to re -enter the boilers such as NOX in the flue gas, CO, coal particles, carry out second burner to it, thereby improve coal -fired utilization ratio, reduced the content of materials such as NOX in the boiler combustion system exhaust flue gas, CO, coal particles. 本申请提供种具备烟气回流功能的锅炉燃烧系统，包括