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Chapter 7 Energy Conversion Systems – Options and Issues Table 7.7 Further results for tripleexpansion analysis at 400°C. MPa % Mass flow rate in kg/s needed for 1 MW 10 MW 50 MW 25 67.6 1.37 13.8 68.8 27 66.9 1.50 15.0 75.2 P1 WV 9 CWP 1 7 IW ηu TVCS CSVT/G5 CT 719 Thus, for very high inlet pressures – greater than about 28 MPa – a different form of energy conversion system must be found. A binary plant might be considered which allows the EGS fluid to be sent directly to the heat exchangers, but the extremely high pressures would necessitate very thick walled piping and tubes in the heat exchangers. The cost of such elements would be prohibitively high, and the overall heattransfer coefficients would be quite low. These two factors taken together would seem to rule out a simple binary plant, in spite of its inherent simplicity. PW 8 6 2 3 BCV 4M HPP Figure 7.13 Supercritical singleexpansion plant with ultrahigh inlet pressures. LPP An alternative system would simply eliminate the superpressure turbine shown in Figure 7.11, and incorporate a flashseparation process that would reduce the EGS fluid pressure while generating steam for use in a conventional steam turbine. The residual liquid from the separator might then be used in a binary plant because the fluid pressure would then be manageable, or it might be flashed a second time, or most simply reinjected. The first option is what is called a flashbinary plant; the second option would be equivalent to using a doubleflash plant, albeit with a very high pressure at the throttle inlet; and the last option would result in a singleflash plant or what we call a “single expansion” plant. We examined the last case in detail. Figures 7.13 and 7.14 show the plant in schematic form and the processes in temperatureentropy coordinates. CPDF Image | Energy Conversion Systems
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