Toxic and harmful gas treatment device

A poisonous and harmful gas treatment device belongs to the technical field of poisonous and harmful gas treatment equipment. The device is characterized by comprising an air supply fan, an air mixingvalve, a coal feeding scale (12), a pulverized coal fan (13) and a rotary kiln (15), an air outlet of an input pipe (18) is connected with the air supply fan in series and then communicated with an air inlet of a combustor (14) of the rotary kiln (15), and the air inlet of the coal feeding scale (12) is communicated with an air outlet of the pulverized coal fan (13). And a coal outlet of the coalfeeding scale (12) is communicated with a coal inlet of the combustor (14). The air supply fan of the poisonous and harmful gas treatment device can guarantee that the input pipe keeps micro negativepressure, so that the poisonous and harmful gas is prevented from escaping outwards and polluting the environment, the air mixing valve can supplement air for the air supply fan in time, the production process of cement clinke