Nuclear power generation system and control method with supercritical carbon dioxide as working fluid

A nuclear power generation system with supercritical carbon dioxide as working fluid, comprising:

• a main power generation system;
• a waste heat discharging system;
• a working fluid filling control system;
• and
• a working fluid filling and recycling system,
• wherein the main power generation system, the waste heat discharging system, the working fluid filling control system and the working fluid filling and recycling system each has the supercritical carbon dioxide as the working fluid;
• the main power generation system is configured to convert thermal energy into electrical energy, and comprises a reactor and power generation system equipment;
• the power generation system equipment comprises a turbine, a generator, a high-temperature recuperator, a low-temperature recuperator, a first cooler, a first pressurizing branch, and a second pressurizing branch, a first-stage compressor, a second cooler, and a second-stage compressor are sequentially arranged on the first pressurizing branch, a second compressor is arranged on the second pressurizing branch, the working fluid output from the reactor is configured to enter the turbine to perform work, the turbine is configured to drive the generator to generate electricity, and the spent working fluid after expansion is configured to sequentially enter the high-temperature recuperator and the low-temperature recuperator for heat release, the working fluid after heat release is configured to enter the first cooler for cooling, and the cooled working fluid is configured to enter the first-stage compressor for compression, the compressed working fluid is cooled in the second cooler, and the cooled working fluid is further compressed in the second-stage compressor, the high-pressure working fluid compressed by the first-stage compressor and the second-stage compressor is configured to sequentially enter the high-temperature recuperator and the low-temperature recuperator to absorb heat, the working fluid at the outlet of the low-temperature recuperator is further configured to enter the second compressor for compression, the high-pressure working fluid compressed by the second compressor is merged with the working fluid at the outlet of the low-temperature recuperator and re-enters the high-temperature recuperator to absorb heat, the heat-absorbed working fluid is further configured to enter the reactor to absorb heat and become a high-temperature and high-pressure working fluid;
• the power generation system further comprises a first speed increaser, a first motor, a second speed increaser, a second motor, and a speed reducer;
• the first-stage compressor, the second-stage compressor, and the first motor are coaxially arranged;
• the first-stage compressor, the second-stage compressor, and the first motor are connected via gears within the first speed increaser;
• the second compressor and the second motor are coaxially arranged;
• the second compressor and the second motor are connected via gears within the second speed increaser;
• the turbine and the generator are coaxially arranged, and the turbine and the generator are connected via gears within the speed reducer;
• the speed reducer, the first speed increaser, and the second speed increaser are each connected to a recovered working fluid inlet pipeline of the working fluid filling and recycling system through a first pipeline;
• and the inlet of the first cooler is in communication with a main power generation system working fluid filling outlet pipeline of the working fluid filling and recycling system via a second pipeline, the working fluid filling and recycling system is configured to recycle the working fluid;
• and
• the working fluid filling and recycling system comprises the recovered working fluid inlet pipeline, a filling heat exchanger, a working fluid storage tank, and a second heater, an outlet of the recovered working fluid inlet pipeline is connected to a heat release inlet of the filling heat exchanger;
• a heat release outlet of the filling heat exchanger is connected to an inlet of the working fluid storage tank through a heat release branch pipeline;
• a heat absorption inlet of the filling heat exchanger is connected to an outlet of the working fluid storage tank through a heat absorption inlet branch pipeline;
• a heat absorption outlet of the filling heat exchanger is connected to an inlet of the second heater through a heat absorption outlet branch pipeline;
• an outlet of the second heater is in communication with an inlet of the first cooler through a main power generation system working fluid filling outlet pipeline;
• the outlet of the second heater is further connected in sequence to the active waste heat discharging system pipeline through an active waste heat discharging system filling outlet pipeline and a fifth pipeline;
• and the outlet of the second heater is also connected in sequence to the passive waste heat discharging system pipeline through a passive waste heat discharging system filling outlet pipeline and a sixth pipeline.