Energy storage stage:
When electricity is abundant, atmospheric-pressure gaseous carbon dioxide is compressed to store the compression heat, and high-pressure carbon dioxide is liquefied and stored at room temperature.
Power generation stage:
The stored heat is used to heat high-pressure liquid carbon dioxide to a high-temperature gas, driving a turbine to generate electricity.
What are the advantages of carbon dioxide energy storage?
Carbon dioxide energy storage systems have many advantages in large capacity, long duration, and safety.
Environmentally friendly, carbon dioxide operates in a closed system, has little impact on the environment, and the entire process is a physical change process, and no pollutants are produced; there are no special geological conditions required, no underground space is required, the regional adaptability is good, and no special geological conditions are required for site selection; short construction period, long life, zero carbon emissions, the construction period is about 2 years, and the service life is more than 30 years, no refueling, zero carbon emissions, and the cost of electricity per kilowatt-hour is low throughout the life cycle; constant pressure operation throughout the process, the system operates at a constant pressure at all times, the rotating machinery operates at rated conditions for a long time, and the system efficiency is high; it meets the needs of power grid dispatching, compression, expansion, heat exchange and other equipment can be quickly started and stopped in a short time, and respond to the requirements of power grid dispatching in a timely manner; providing auxiliary services can provide rotational inertia support for the power grid, and can provide auxiliary services such as peak load regulation and frequency regulation; the industrial chain is controllable, and each subsystem and key core equipment is independently developed, safe and controllable.