Balanced pollutant clearing system

The embodiment of the invention discloses a balanced pollutant clearing system, and relates to the field of flue gas collecting devices. The clearing system comprises a fan, an air injection device, an air suction device and a control device; the air injection device is arranged on the periphery of a shielded object, a plurality of air injection ports are arranged on the air injection device, andan air inlet of the air injection device is connected with an air outlet of the fan through a pipeline; the air suction device is used for sucking away pollutants and heat generated by the shielded object as well as air ejected by the air injection ports; and the control device is used for controlling the air flow output by the fan and adjusting the air suction amount of the air suction device according to the air flow output by the fan. According to the balanced pollutant clearing system provided by the embodiment of the invention, air is injected through the air injection device, so that a circular air curtain is fo