Energy Storing Cryogenic Carbon Capture

Energy Storing Cryogenic Carbon Capture™ (CCC-ES) is a special implementation of CCC that enables efficient grid-scale energy storage and carbon capture with little to no effect on peak plant capacity.

Intermittent renewable sources such as wind and solar can cause difficulties for power plants where high turndown ratios or rapid load cycles are undesirable, such as coal-fired power plants. When CCC-ES is implemented at such a plant, the parasitic load of CCC-ES can be "rescheduled" to times when demand is low or when intermittent sources are available. This enables the power plant to run always at its most efficient operating point, with CCC-ES absorbing the rapid changes in demand or intermittent source availability.

The quantity of energy that can be stored using CCC-ES is enough for a complete daily load cycle, with CCC-ES storing energy at night and releasing it during the day. This means that a plant can not only capture 95–99% of its CO2, but it can do so at peak demand times with virtually no loss of capacity.

CCC-ES also makes sense economically. Comprehensive simulations have shown that implementing CCC-ES at a plant can increase profits by 22–30%, or 2.1–2.7 ¢/kWh.

Technical Details


The greatest power consumption of Cryogenic Carbon Capture (CCC), and the source of the highest parasitic load on the power plant, occurs in the compressor used in the liquefaction of LNG, the CCC refrigerant. CCC-ES stores energy during times of low power demand on the grid by liquefying more refrigerant than is needed. This raises the parasitic load on the plant, but that excess power is already available since the demand on the grid is low. The excess refrigerant is stored in a cryogenic tank.

When grid demand is high, the refrigerant compressor is shut off, dropping the parasitic load to nearly zero. The stored refrigerant is then used to provide cooling. The spent refrigerant can then be burned in a natural gas turbine to provide even more power to the grid.

Demonstrations

SES is currently testing an implementation of CCC-ES using the small pilot demonstration unit of the CCC-ECL process.

CCC-ES integrated with the CCC-ECL small pilot demonstration unit

CCC-ES integrated with the CCC-ECL small pilot demonstration unit

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