INNOVATIVE TECHNOLOGY
Operating Principle
This innovative carbon dioxide energy storage system developed by Exa Energy Technology utilizes a gas-liquid phase transition and dual-state coordinated energy storage technology. The basic principle involves compressing ambient-temperature, atmospheric-pressure carbon dioxide gas into a liquid state during off-peak electricity periods, while storing the thermal energy generated during compression. During peak electricity demand, the stored thermal energy heats liquid carbon dioxide, converting it back into a gas to drive a turbine to generate electricity.
Energy Storage
Carbon dioxide at ambient temperature and pressure enters the compressor, where it is compressed using surplus electricity. The compressed carbon dioxide, now at a higher temperature and pressure, enters the heat exchange system to transfer its heat to a thermal energy storage and the high-pressure carbon dioxide is condensed and stored in the liquid storage system.During this process, electrical energy is converted into thermal and pressure energy, completing the energy storage cycle.
Energy Release
The high-pressure liquid carbon dioxide stored in the liquid storage system evaporates and flows into the heat exchange system, where it absorbs heat from the high-temperature thermal storage medium. The heated, high-pressure carbon dioxide expands and drives a turbine to produce electricity. The cooled, depressurized carbon dioxide is then stored in the gas storage system.In this phase, the stored thermal and pressure energy is converted back into electrical energy, completing the energy release process.
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Green and
Carbon-NegativeZero - Carbon sourcing with negative emissions -
Enhanced
SafetyLow pressure and temperature levels, no risk of combustion or explosion, and no environmental pollution -
Universal
AdaptabilityUnaffected by climate conditions or geological constraints, adaptable to various envrionments -
Large-Capacity and
Long-DurationSimultaneous charging and discharging, capable of 24-hour continuous power generation -
Grid-FriendlyStable power output with no attenuation, supporting ancilary services of inertia frequency modulation ans AGC -
Low Levelized Cost
of ElectricityLow Levelized Cost of Electricity over full lifecycle