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Chapter 7 Energy Conversion Systems – Options and Issues S WVCS TVMRSE/C CCW BCV F CP PW WP WP IW 712 analysis, but may have practical importance from a chemical scaling standpoint. SP SP CSV T/G Figure 7.6 Doubleflash power plant in simplified schematic form (DiPippo, 2005). Note that a water cooling tower is shown in Figure 7.5, but that aircooled condensers could be used in all of the systems, both flash and binary, allowing 100% reinjection into the EGS reservoir. The latter option would increase the plant capital cost and reduce the net power, all other factors being the same. If the EGS fluids are kept in the liquid state by the application of high pressure, these cases are similar thermodynamically to the typical hydrothermal situations encountered in many fields around the world. The fluid pressures may be higher than normally found in natural reservoirs, but the systems analysis is the same. Whether the geofluids are allowed to flash into twophase liquidvapor flow in the production wells, or at the surface separator, it makes no difference in the thermodynamic The two plants were analyzed to determine the thermodynamic optimum conditions, i.e., the highest specific power output for each geofluid temperature, for a fixed condensing temperature of 50°C. Turbine efficiency was downgraded to account for moisture in the lowestpressure stages using the Baumann rule (DiPippo, 2005). The parasitic power requirements have been assumed to be 5% of the gross turbine power. That is, in arriving at the mass flow rates needed for a specified MW power output, the specific turbine power was first multiplied by 0.95. The final optimized performance results are shown in Table 7.5. The utilization efficiency, i.e., the ratio of the power output to the rate of exergy supplied by the geofluid, is 31.2% for the 200°C single flash case, and 45.8% for the 250°C doubleflash case.PDF Image | Energy Conversion Systems
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