Abstract
Among the presently available energy storage systems, second generation CAES 2 (Compressed Air Energy Storage) shows attractive economic and operational features together with satisfactory level of performance.CAES2 plants integrate an air compression and storage system with a commercially available Gas Turbine. A small size plants based on a 4600kW Mercury recuperated Gas Turbine equipped with an artificial compressed air storage system has been investigated. Preliminary evaluations have been carried out to assess the maximum achievable GT power augmentation taking operations safety and plant life duration into consideration. For a fixed amount of stored air (defined according to the requested minimum duration of the discharge phase), investment, maintenance and operating costs have been evaluated by varying the air storage pressure from 2000 to 10000kPa. The minimum annual equivalent cost is achieved by assuming a design storage pressure of 4000kPa. From 4000 to 10000kPa, costs are in practice insensitive to the air storage pressure.
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