Energy storage box principle

What is thermodynamic energy storage?

Thermodynamic electricity storage adopts the thermal processes such as compression, expansion, heating and cooling to convert electrical energy into pressure energy, heat energy or cold energy for storage in the low period of power consumption, and then convert the stored energy into electrical energy at the peak of electricity consumption.

Why do we need electricity storage?

Compared with heat and cold energy, electricity is more suitable for long-distance transmission. Therefore, in the grid side, electricity storage must be carried out to solve the large difference between peak and valley power and increase the share of renewable energy generation.

How does a solar energy storage system work?

To store the energy, the system uses an injection/production well that extended from the ground surface to a deep aquifer. During the charging process, CO 2 is injected into the target deep aquifer through wellbore. During the discharging process, CO 2 is produced to the ground surface to complete the power generation process.

Is energy storage a key technology for achieving the 'dual carbon' goal?

Energy storage is a key technology for achieving the ‘dual carbon’ goal and the development of energy storage is of high strategic importance. Compared to other storage technologies, the thermodynamic electricity storage technology represented by CAES, CCES and PTES is more suitable for large-scale and long-term storage.

Does thermodynamic electricity storage depend on water resources?

On the contrary, thermodynamic electricity storage does not depend on water resources, and can be used as a supplement or substitute for PHES stations. Meanwhile, it should be noted that thermodynamic electricity storage is often accompanied by the storage and release of cold energy and heat energy.

How does a heat storage subsystem work?

After heated and expanded, CO 2 at the turbine outlet absorbs the cold energy stored in the charging process and is condensed into a liquid state. The condensed liquid CO 2 is then stored in the low-pressure liquid CO 2 storage tank. Furthermore, the heat storage subsystem is basically the same as that of CAES.