Shaft seal steam waste heat recovery double-working-medium power generation system and control method

The invention discloses a shaft seal steam waste heat recovery double-working-medium power generation system and a control method, which comprise a steam source and are characterized in that the system further comprises two subsystems, namely a Rankine cycle subsystem and an organic working medium cycle subsystem. The Rankine cycle subsystem comprises a main steam pipeline, a valve rod steam seal and steam leakage direction component, a back pressure turbine, a back pressure turbine steam exhaust pipeline, a front shaft seal and steam leakage direction component and a rear shaft seal and steam leakage direction component. The organic working medium circulation subsystem comprises a water spraying cooling device, an organic working medium evaporator, an organic working medium preheater, a turbine exhaust heat regenerator, a working medium pump, a magnetic suspension turbine generator all-in-one machine, an air cooling island, a steam pipeline originally connected to sparse expansion, a shaft seal steam condens