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7.2.3 Electricity from EGS resources at supercritical conditions Energy Conversion Systems – Options and Issues SPT F LPCT The analysis was based on the following assumptions: Chapter 7 A novel energy conversion system was developed to handle the cases when the EGS geofluid arrives at the plant at supercritical conditions, i.e., at a temperature greater than 374°C and a pressure greater than 22 MPa. For all situations studied, the temperature was taken as constant at 400°C. The plant is called the “tripleexpansion” system; it is shown in simplified schematic form in Figure 7.11, and the thermodynamic processes are shown in the temperatureentropy diagram in Figure 7.12. The tripleexpansion system is a variation on the conventional doubleflash system, with the addition of a “topping” densefluid, backpressure turbine, shown as item SPT in Figure 7.11. The turbine is designed to handle the very high pressures postulated for the EGS geofluid, in much the same manner as a “superpressure” turbine in a fossilfueled supercritical doublereheat power plant (El Wakil, 1984). However, in this case, we impose a limit on the steam quality leaving the SPT to avoid excessive moisture and blade erosion. 717 S WV 1 CS HPT 89 BCV5 7 TV 6 3 11 CW • Geofluid inlet temperature, T = 400°C. • Geofluid pressure, P1 > 22 MPa. • Condenser temperature and pressure: T10 = 50°C and P10 = 0.123 bar = 0.0123 MPa. • All turbine and pump isentropic efficiencies are 80%. • Steam quality at SPT exit, state 2 = 0.90. • HPT and LPTturbine outlet steam qualities (states 8 and 10) are unconstrained. 4 13 PW21 HPP 12 14 IW To determine the “optimum” performance, we selected the temperature at the outlet of the flash vessel (statepoint 5) as the average between the temperature at the SPT outlet (state 2) and the condenser (state 10), in accordance with the approximate ruleofthumb for optimizing geothermal doubleflash plants (DiPippo, 2005). No claim is made, however, that this will yield the true optimum triple expansion design, but it should not be far off. Figure 7.11 Tripleexpansion power plant for supercritical EGS fluids. LPP 10PDF Image | Energy Conversion Systems
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