THREE BASIC GEOTHERMAL POWER PLANT DESIGNS
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FIGURE 10.19 Dry steam power plants are driven directly by steam that pushes up from the well driven into the geothermal formation. In a flash steam power plant, hot water rising from the geothermal formation enters the lower pressure of the flash tank, where some of the water “flashes” into steam driving a turbine. In binary-cycle power plants, lower-temperature geothermal waters are used to vaporize a liquid with a boiling point lower than that of water.