Direct-steaming efficient exhaust-air cooling and heating heat pump system

A direct-steaming efficient exhaust-air cooling and heating heat pump system comprises an exhaust air heat exchange device located above an exhaust air wellhead. An upper opening of the exhaust air heat exchange device is connected with a first valve port of a four-way valve through a pipeline, a lower opening of the exhaust air heat exchange device is connected with a first interface of a shell and tube exchanger through a pipeline provided with a first circulating pump, a third valve port of the four-way valve is connected with a second interface of the shell and tube exchanger, a client interface of the shell and tube exchanger is connected with a client through a circulating pipeline provided with a second circulating pump, and a fourth valve port of the four-way valve is connected with a high-pressure outlet of a compressor through a pipeline provided with an oil-fluorine separator. Exhaust air, at constant temperature, discharged from the exhaust air wellhead of a mine is utilized to produce hot water u