Nuclear power unit heat energy recovery device and combined type built-in heat supply network heat exchanger

The invention provides a nuclear power unit heat energy recovery device and a combined type built-in heat supply network heat exchanger. The nuclear power unit heat energy recovery device comprises a steam turbine, and the steam turbine comprises a steam turbine low-pressure cylinder; an inlet of the condenser is communicated with a steam exhaust port of the turbine low-pressure cylinder; the heat supply network circulation part comprises a combined type built-in heat supply network heat exchanger water inlet pipe; the combined type built-in heat supply network heat exchanger is located in the condenser, steam extracted by a low-pressure cylinder of the steam turbine provides a heat source for the combined type built-in heat supply network heat exchanger, and the combined type built-in heat supply network heat exchanger is used for heating circulating water in a water inlet pipe of the combined type built-in heat supply network heat exchanger; an external heating network heater water inlet pipe; and the exter