Blast furnace cinder flushing water residual heat power generation system

The invention provides the improvement to a blast furnace water extraction cinder flushing technology, and discloses a system for generating electricity by fully recycling molten cinder residual heat. The system comprises an atmosphere-type thermosyphon cinder flushing tower an outlet end of which is sequentially connected with a dehydration device, a hot water tank with a filter, a hot water pump, a flash evaporator, a negative-pressure steam turbine and an asynchronous power generator; an air exhaust port of the negative-pressure steam turbine is connected with a wet-type air cooling condenser; the flash evaporator and a water exhaust port of the wet-type air cooling condenser are both connected with a cinder flushing water tank; and the cinder flushing water tank is connected with the atmosphere-type thermosyphon cinder flushing tower through a cinder flushing pump. The system converts low-grade heat energy into electricity energy by adopting a negative-pressure steam power generation technique so as to reduce investment and factory electricity consumption; the wet-type air cooling condenser is arranged at a high position, and a condensation water pump is not required to be arranged; and meanwhile, in order to solve the contradiction of discontinuity of the cinder flushing process and continuous operation of a power station, the system replaces a synchronous power generating set by adopting the asynchronous power generator, and can achieve the aims of initial investment and operation and maintain expense reduction and simple and easiness in control for the system.