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4.3 Compression Process Flow and Heat – Material Balance Having established the likely number of CAES wells that could be used by a single geothermal producing well, the simulation was adjusted to account for compressor sizing and piping required to fill the 35 CAES wells over a 12-hour period. Relative to the design basis described in Section 4.1, minor modifications to the simulation resulted in slight decrease in compressor average power consumption of approximately 2 kW. During the compression stage, the 8-stage intercooled centrifugal compressor, operating at a normalized average of 242 kW over the time duration, was simulated to fill a single well with a flow rate of 1,312 kg/hr (AMBAIR) compressing ambient air (1 bar, 25°C, and 60% relative humidity) to 219 bar. With the compressor modeled at 80% polytropic and 98% mechanical efficiency, a multiplier was used to then size the unit for a 35-well CAES system. With a combined total flow of 45,918 kg/sec, the compressor (C-110) would deliver 45,243 kg/hr of compressed air (CMPDIS) to the 35 wells over a 12-hour period, consuming a total of approximately 102,000 kWh. Compressor condensate (CMPH2O) at 674 kg/hr could be reinjected, or as a relatively high purity water stream, could be used to offset site water needs as applicable. The compressed air is distributed at 124°C to the wellhead. Because this simulation work evaluated diurnal operations of the CAES unit, it was assumed that injected air would retain remaining heat of compression, thereby reducing the heat required when recovered and utilized in the power generation mode. The configuration is shown in Figure 4.3, followed by the heat and material balance in Table 4.2. 18PDF Image | Geothermally Well Based Compressed Air Energy Storage
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