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4.0 System Design and Unit Operations The overall objective of the wellbore and plant simulations was to model and calculate a representative design and cost basis for augmenting a geothermally derived Rankine cycle, using compressed air that could be stored at pressure in abandoned or repurposed wells. At a summary level, the usefulness of augmenting the power production cycle affords greater operating flexibility by being capable of supporting potential value streams for both consumption and production of power and energy. Routine operation of the facility assumed that grid supplied energy would be available for the compression cycle. Depending on location, the energy could be derived from excess capacity and/or lower value energy as might be coincident with off-peak hours. During the power generation cycle, compressed air would be extracted from the wellfield and expanded and reheated twice in an expansion turbine using extraction steam from an existing steam turbine. Process modeling was performed to evaluate the potential for load (air compression cycle) and power production (compressed air extraction cycle) that could be expected during operation of the GT-CAES facility. For the purposes of system design, compression was assumed to take place over a 12-hour off- peak cycle, with expansion and power generation occurring over a 4-hour peak period. The simulations and accompanying heat and material balances were developed using ASPEN, and the overnight total project cost estimates were developed using ASPEN Process Economic Analyzer (ASPEN IPE®, v. 8.4) which provides costs in 2013 dollars. 4.1 CAES Wellbore Design Basis Mass flow, total mass, and compression requirements were estimated consistent with the methodology described in Section 3.1, using a common completion of 9-5/8 inch K-55 production casing cemented in place from the surface to a plugged-back depth of 8,500 ft (Figure 4.1). 14PDF Image | Geothermally Well Based Compressed Air Energy Storage
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