Dead steam waste heat utilization system of indirect air cooling unit

The utility model relates to a waste heat utilization system, in particular to a waste steam waste heat utilization system of an indirect air cooling unit, and aims to effectively utilize waste heat of the air cooling unit and improve the heat supply capacity of the unit. The steam turbine comprises a steam turbine low-pressure cylinder, a steam turbine medium-pressure cylinder, low-pressure cylinder exhaust steam, a main condenser, an exhaust steam lead-out pipeline, an exhaust steam pipeline, a medium-pressure cylinder steam extraction pipe, a steam injection air extractor, a front heating network condenser, a high-pressure heating network condenser, a heating network heater, a front heating network condenser condensate pipe, a high-pressure heating network condenser condensate pipe anda heating network heater drain pipe. A heat supply network circulating water return pipe, a heat supply network circulating water pipe and a heat supply user; wherein the heat supply network circulating water return pipe is c