Abstract: A method for utilizing acidic geothermal fluid (e.g., fluid having a pH of less than about 3.5) containing non-condensable gases in a geothermal power plant includes separating the geothermal fluid into steam and brine, applying the steam to a device from which power and steam condensate is produced. Such device can be a back-pressure steam turbine whose exhaust can be cooled by organic fluid to produce organic vapor that is expanded in an organic vapor turbine. Alternatively, the steam can be applied to the steam-side of an indirect contact heat exchanger containing a liquid organic working fluid for producing steam condensate and vaporized working fluid. In such case, the steam condensate produced by the heat exchanger is less acidic than the brine. The vaporized working fluid is expanded in an organic vapor turbine for producing electricity and expanded working fluid, and the expanded working fluid is condensed for producing condensed organic fluid which is preheated and supplied to the heat exchanger.

Abstract: Power is produced from geothermal fluid containing non-condensable gases whose main constituent is carbon-dioxide. The geothermal fluid is separated into steam and geothermal liquid, the steam being applied to a steam turbine which produces power. The steam exiting the turbine indirectly condensed by an organic fluid liquid which is vaporized and used to run at least one organic vapor turbine for producing power. Organic vapor exiting the organic vapor turbine is condensed and preheated by the steam condensate. Heat extracted from the geothermal liquid is used to run another organic vapor turbine producing power and cooled geothermal liquid which is combined with the cooled steam condensate to form a mixture to which the non-condensable gases are added to form an effluent that is injected into a re-injection well.

Abstract: Apparatus for producing from a source of geothermal fluid that contains a mixture of high pressure steam, brine and noncondensable gases includes a heat exchanger for receiving geothermal fluid and transferring heat to water thereby vaporizing the same to produce steam. At least one power plant module is involved, the module having a steam turbine responsive to steam produced by the heat exchanger for producing work, a steam condenser containing an organic fluid and responsive to low pressure steam that exits the steam turbine for condensing the steam into a liquid and vaporizing the organic fluid. The module also contains an organic vapor turbine responsive to vaporizer organic fluid for producing work, and an organic vapor condenser responsive to the low pressure organic fluid that exits the organic vapor turbine condensing the organic vapor to a liquid that is returned to the steam condenser. The cooled geothermal fluid leaving the primary heat exchanger is conducted to a rejection well.