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4.2 Air Compression and Wellfield Utilization To arrive at an appropriate number of CAES wells that could be supported by a single geothermal well, an iterative analysis was completed starting with the baseline geothermal well characteristics as described in Section 3.2 (16,411 kg/hr steam), coupled with the single CAES wellbore analysis. The governing premise was to add CAES wells (and accompanying mass flow) to the simulation until essentially all of the steam had been consumed in the reheat stages. This required setting up an initial simulation (Figure 4.2) to determine the duty required by the re-heat exchangers between the first and second expansion turbines, as well as the second and third expansion turbines, and simulating expander output (kW). Extracting from a single CAES well at a rate of approximately 3,960 kg/hr per well for a period of 4 hours, this single well configuration indicated that 239 kg/hr of steam would be consumed in the first reheat (FHTR1 going to HTR1), while the second reheat (FRHT1 going to RHT1) would consume 223 kg/hr of steam, leaving approximately 16,000 kg/hr steam available for consumption. Having met the heat exchanger duties, the excess steam, highlighted as the RHTSTM flow stream in the Figure 4.2 (“To other air wells”), was simulated to be available for additional air heating. A single geothermal well, with a steam rate of 16,411 kg/hr, is estimated to support up to 30 to 35 CAES wells via preheating of air prior to each expansion stage. Modeling included efforts to improve the round trip efficiency, including refinements to steam utilization, and mass flow of air to maximize power output within the mechanical limits of the machinery and proposed well completions. As noted in Table 4.1, this also assumed that a modest amount of air would remain in the wellbore at all times. With the remaining air mass in the well at 47 bar (equivalent to 5,150 kg air), the working gas volume was simulated at 15,500 kg per wellbore, or 512,000 kg total for compressed air that could be used in the expansion (generation) mode. 16PDF Image | Geothermally Well Based Compressed Air Energy Storage
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