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5.0 GT-CAES Air Recovery and Power Generation During the power generation phase of the GT-CAES cycle, produced air is expanded for 4 hours per day in three stages of expansion, with geothermally derived steam providing reheating between each stage. As envisioned, the GT-CAES plant could be deployed to supplement an existing steam-based geothermal power plant to increase operating flexibility, or could be constructed and operated as a standalone unit. The following simulation proposes a standalone configuration which would directly access an available geothermal steam supply and use a backpressure turbine to meet process pressure and temperature requirements. In the event that extraction steam from an existing steam turbine is available at the temperature, pressure and rate needed, the only difference between these two configurations is the use of a backpressure turbine and the associated costs. 5.1 Power Generation Process Flow and Heat – Material Balance Recovery of compressed air is assumed to take place continuously over a 4-hour power generation cycle. Similar to the air compression and injection simulation, the model assumed compressed air recovery from a single well at 3,878 kg/hr, and extrapolated to extract from 35 wells. Polytropic efficiency of 85% and mechanical efficiency of 98% are assumed for all expanders.1 Expansion pressures are governed to maintain expander discharge temperatures above freezing, except the final expansion, which is discharged to atmosphere. Starting with the geothermally derived steam supply (GTWELL), 16,411 kg/hr of 189°C steam at 6 bar would supply a modest backpressure turbine (ST-110), recovering 511 kW. Discharge from the backpressure turbine at 135°C, 3 bar, and 16,411 kg/hr would split and supply two compressed air reheaters. HTR-1 would consume 8,238 kg/sec of 135°C steam, and RHT-1 would consume 7,924 kg/hr of 135°C steam. Condensate out of both reheats is assumed to be reinjected in the subsurface. The combined flow of compressed air at 135,729 kg/hr is recovered from the wellfield at 124°C and 218 bar (WELLAIR3). The first expansion (EXP1) takes place without reheat and yields 4,432 kW. Once expanded (EXP1OUT) at 2°C and 47 bar, the air is reheated to 125°C (HTR1), and expanded in the second stage (EXP2) yielding 4,623 kW. Expander discharge is held to above freezing temperatures, reheated again to 125°C, and expanded in the last stage, yielding 5,815 kW. The final expansion discharge temperature at -30°C is released to atmosphere. Combined, the GT-CAES plant is capable of generating 15.4 MW, consuming 2 MW of extraction steam. As modeled, the remaining steam available for reheat (RHTSTM) is a modest 248 kg/hr. With a single reheat requiring 220 to 240 kg/hr (see Section 4.2), the remaining steam is considered unusable and is not consumed. 1 GE Turbo-Expander Compressors; GE Oil and Gas Pamphlet. 20PDF Image | Geothermally Well Based Compressed Air Energy Storage
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