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The 4th International Symposium – Supercritical CO2 Power Cycles September 9-10, 2014, Pittsburg, Pennsylvania Bulk Energy Storage using a Supercritical CO2 Waste Heat Recovery Power Plant Steven A. Wright SuperCritical Technologies, Inc. PO Box 1108, Bremerton, WA swright@supercriticaltech.com Chal S. Davidson SuperCritical Technologies, Inc. PO Box 1108, Bremerton, WA cdavidson@supercriticaltech.com William O. Scammell SuperCritical Technologies, Inc. PO Box 1108, Bremerton, WA bscammell@supercriticaltechnologies.com ABSTRACT AND INTRODUCTION This report describes a bulk energy storage and power peaking concept that is coupled to a Supercritical CO2 (SCO2) Waste Heat Recovery (WHR) power plant. The waste heat source could be the exhaust from a 25 MWe class gas turbine or hot gases from manufacturing process such as a metal smelter. The SCO2 power system is configured either as a supercritical Brayton cycle (off-peak power production) or as a transcritical Rankine cycle (on-peak). Energy is stored as ice in the “charging cycle” and then discharged by melting the ice during the on-peak demand time period. The ice is produced in a transcritical CO2 refrigeration cycle (heat pump) from CO2 at –5 C. The power to run the CO2 refrigeration cycle can come from either the grid or directly from the SCO2 Brayton cycle. The charging cycle operates for approximately 8 hours during the night and early morning when the demand and the price of electricity are low. The stored thermal energy is recovered, or “discharged”, over a period of about 4 hours during the early evening when peak power demands and the price of electricity are high.PDF Image | Bulk Energy Storage using a Supercritical CO2 Waste Heat Recovery Power Plant
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