Carbon dioxide energy storage system and control method thereof

A carbon dioxide energy storage system, comprising:

• a gas storage unit, an energy storage component, a liquid storage unit and an energy release component sequentially closed-loop connected;
• wherein the carbon dioxide energy storage system further comprises a gas temporary storage unit connected between the energy storage component and the energy release component;
• the gas temporary storage unit comprises a gas storage container, a first connection pipeline and a second connection pipeline;
• the energy storage component comprises a compressor and an energy storage heat exchanger;
• the energy storage heat exchanger is connected to an outlet of the compressor through an energy storage pipeline;
• the energy release component comprises a turbine and an energy release heat exchanger;
• the energy release heat exchanger is connected to an inlet of the turbine through an energy release pipeline;
• an inlet of the gas storage container is connected to the energy storage pipeline through the first connection pipeline;
• an outlet of the gas storage container is connected to the energy release pipeline through the second connection pipeline;
• a first valve is arranged on the first connection pipeline, and a second valve is arranged on the second connection pipeline;
• wherein the energy release pipeline comprises a first inlet, a second inlet, a first outlet and a second outlet;
• an outlet of the energy release heat exchanger is connected to the first inlet of the energy release pipeline through a third valve;
• the inlet of the turbine is connected to the first outlet of the energy release pipeline through a fourth valve;
• the second connection pipeline is connected to the second inlet of the energy release pipe;
• the second outlet of the energy release pipeline is connected between the energy storage component and the liquid storage unit through a third connection pipeline;
• and the third connection pipeline is equipped with a fifth valve;
• and
• wherein the gas temporary storage unit is configured as follows:
• within a first time period after the energy storage component begins operation and within a second time period before the energy storage component stops operation, the gas temporary storage unit is configured to receive and store high-temperature carbon dioxide gas output from the energy storage component to obtain stored high-temperature carbon dioxide gas;
• and
• before the energy release component begins operation, the gas temporary storage unit is configured to input the stored high-temperature carbon dioxide gas into the energy release component, and replace low-temperature carbon dioxide gas in the energy release pipeline in the energy release component with the high-temperature carbon dioxide gas.