Deep extraction device for waste heat of mine exhausted air

The invention discloses a deep extraction device for waste heat of mine exhausted air. Mine supplied air is heated by combining the waste heat of the mine exhausted air with a heat pump technology, traditional heat sources such as a coal fired boiler are replaced, and the deep extraction device has the advantages of high heat efficiency, energy saving and environmental protection; the deep extraction device comprises a mine air exhaust opening, an air exhaust channel communicating with the mine air exhaust opening, a heat recovery device connected with the air exhaust channel, a heat pump system connected with the heat recovery device, and a mine air inlet heater connected with the heat pump system; and the air exhaust channel comprises a first ventilation air diffusion tower for realizingprimary spraying and a second ventilation air diffusion tower for realizing secondary spraying. On the basis of primary water spraying, secondary saline solution spraying is additionally set, thus double-stage segmented spra