Combined-cycle indirect air cooling system

The invention discloses a combined-cycle indirect air cooling system. The combined-cycle indirect air cooling system comprises an air cooling island and a condenser. An outlet end of the air cooling island is connected with a working medium inlet end of the condenser by a working medium pump, a working medium outlet end of the condenser is connected with a working medium turbine and the outlet end of the working medium turbine is connected with an inlet end of the air cooling island. A steam inlet end of the condenser is connected with a main steam turbine. The inlet end of the main steam turbine is connected with a main steam pipeline and a power output shaft of the main steam turbine is connected with a main electric generator. The power output shaft of the working medium turbine is connected with an auxiliary electric generator and a condensed water outlet end of the condenser is connected with a condensed water pipeline by a condensed water pump. A working medium tank is arranged between the outlet end of the working medium turbine and the inlet end of the air cooling island. According to the system, the advantages of the cold sources in the cold areas can be used for lowering the coal consumption rate of an air cooling machine set more efficiently, more environmentally and more reliably.