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| Number | Title | Issue Date |
| 7422798 | Vapour turbine Vapour turbine operating with geothermal vapours containing corrosive agents or aggressive substances such as chlorides and/or sulfides in particular. The turbine comprises a series of stator blades and a series of rotor blades, each stator blade of the series of st... | 09/09/2008 |
| 7331179 | System and method for production of hydrogen A technique is disclosed for a system and method for combined production of power and hydrogen utilizing the heat from a first working fluid heated by a geothermal energy source using a steam generator and an electrolyzer designed to receive the steam produced by th... | 02/19/2008 |
| 7284376 | Method of and apparatus for cooling a seal for machinery A method and an apparatus for producing power from a heat source comprising a nonane heater/vaporizer, an intermediate fluid vapor turbine mounted on a shaft that receives and expands the vaporized nonane, an organic fluid vaporizer that receives the expanded vapori... | 10/23/2007 |
| 7174715 | Hot to cold steam transformer for turbine systems A steam transformer (200) receives steam through a steam inlet (203), and the steam is mixed in a mixing zone (231) with water entering through a water inlet (205). Steam cooled by contact with the water exits the steam transformer throug... | 02/13/2007 |
| 7124584 | System and method for heat recovery from geothermal source of heat A system is disclosed for generating energy from a geothermal heat source. The system includes a fluid injection system configured for injecting fluid into a subterranean formation and a fluid extraction system configured for extracting fluid from the subterranean f... | 10/24/2006 |
| 7059131 | Method and system for exchanging earth energy between earthly bodies and an energy exchanger, especially to produce an electric current An energy exchanger (2) is connected to an earth energy exchanger (18) via a flow line (10) and a return flow line (14). The flow line (10) and the return flow line (14) are both provided with a regulatable stop valve (12... | 06/13/2006 |
| 7013645 | Apparatus and method for generating electrical energy An energy producing apparatus and method are provided to harness thermal energy from a down hole resource (such as oil or gas) on an offshore rig and to generate electrical power from the thermal energy. This may include a pipe to receive either the high temperature... | 03/21/2006 |
| 7010920 | Low temperature heat engine A method for producing power to drive a load (17) using a working fluid circulating through a system that includes a prime mover (12) having an inlet and an accumulator (20) containing discharge fluid exiting the prime mover. A stream of heated ... | 03/14/2006 |
| 6708494 | Device for utlilizing geothermal heat and method for operating the same An apparatus and a method for using geothermal energy include the use of at least a first conduit, through which a working substance is carried downward into the interior of the Earth, at least one second conduit, through which the working substance is carried upwar... | 03/23/2004 |
| 6598416 | Fundaments and system for generating power and portable water Studies of the variation in latent heat of fluids with temperature and the rate of heat increase with compression were applied to thermodynamic cycles represented in columns (190, 193, 199). This showed that heat may be circulated and that power output (1... | 07/29/2003 |
| 5970714 | Geothermal power plant operating on high pressure geothermal fluid A geothermal power plant operating on high pressure geothermal fluid includes a primary separator for separating the geothermal fluid into two channels, one containing high pressure steam and the other containing high pressure liquid. A primary steam turb... | 10/26/1999 |
| 5685362 | Storage capacity in hot dry rock reservoirs A method of extracting thermal energy, in a cyclic manner, from geologic strata which may be termed hot dry rock. A reservoir comprised of hot fractured rock is established and water or other liquid is passed through the reservoir. The water is heated by ... | 11/11/1997 |
| 5399067 | Nozzle for use in a geothermal steam turbine and method for preventing adhesion of scale thereto A nozzle for use in a geothermal steam turbine is adapted to prevent precipitation and adhesion of scale onto the surface of the nozzle. A coolant water passageway is provided in an initial stage nozzle of a geothermal steam turbine. An inlet side passage... | 03/21/1995 |
| 5292440 | Removal of hydrogen sulfide from sour water without loss of heavy metal A process for removal of dissolved H2 S from condensed geothermal steam that includes the steps of cooling and oxygenating the sour steam condensate by contacting the sour condensate with air in a cooling tower; collecting the oxygenated conden... | 03/08/1994 |
| 4596698 | Apparatus for utilizing impure steam with extraction of one or more substances therefrom Certain impure steams, especially those from geothermal sources, are contaminated with gaseous substances such as hydrogen sulfide, ammomia, carbon dioxide, substances comprising boron, arsenic and mercury, other gases, as well as finely divided particula... | 06/24/1986 |
| 4577679 | Storage systems for heat or cold including aquifers Systems and methods for storing heat or cold in aquifers in the form of hot or cold water, making use of one or more above-ground subsystems for collecting or utilizing the aquifer-stored heat and/or cold. A salient feature of the aquifer storage systems ... | 03/25/1986 |
| 4458492 | Method for the recovery of geothermal energy A method for the recovery of geothermal energy from subterranean formations comprising injecting a thermally stable, non-corrosive, non-aqueous fluid into said formation to absorb heat; recovering the heated fluid from the formation; and, recovering heat ... | 07/10/1984 |
| 4366675 | Geothermal turbine installation A geothermal turbine intallation in which high-pressure steam is separated from geothermal steam, which is a mixture of steam and water, with the high pressure steam connected to a high pressure turbine. Low pressure steam produced by flashing the hot wat... | 01/04/1983 |
| 4364232 | Flowing geothermal wells and heat recovery systems The flow performance of the geothermal wells represents the ability of the wells to produce useful heat. A liquid-dominated geothermal well can be made to flow by introducing a primary fluid at a selected level in the well. In the process disclosed herein... | 12/21/1982 |
| 4360547 | Selective scale formation A fluid stream is treated with at least one scale inducing agent prior to being passed through an engine having sweeping elements which limit the thickness of scale deposits therein to improve the efficiency with which the engine utilizes the energy conta... | 11/23/1982 |
| 4357802 | Geothermal energy production Process for recovery of energy from geothermal fluids such as geothermal brine in a geothermal formation by injecting a water immiscible working fluid, preferably organic, typically a hydrocarbon, e.g. isobutane, into the geothermal formation containing a... | 11/09/1982 |
| 4357801 | Removal of carbon dioxide in geothermal power systems A process for removing carbon dioxide in geothermal power generating processes employing a geothermal fluid such as geothermal brine containing carbon dioxide, to improve the efficiency of geothermal power generation, comprises introducing an aqueous alka... | 11/09/1982 |
| 4346560 | Multi-stage flash degaser A multi-stage flash degaser (18) is incorporated in an energy conversion system (10) having a direct-contact, binary-fluid heat exchanger to remove essentially all of the noncondensable gases from geothermal brine ahead of the direct-contact binary-fluid ... | 08/31/1982 |
| 4345652 | Process for improving the permeability of ground formations, adapted to the production of high temperature geothermic energy This process comprises the three successive following steps of: (a) injecting into a formation a solution of sodium or potassium hydroxide during a limited time interval to perform a chemical leaching treatment of the formation, (b) injecting a saline solution... | 08/24/1982 |
| 4341077 | Process and system for recovery of energy from geothermal brines and other hot water sources Process and system for recovery of energy from geothermal brines and other hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a hydrocarbon working fluid, e.g. n-butane, in a heat transfer column, the heat ... | 07/27/1982 |
| 4326581 | Direct contact, binary fluid geothermal boiler Energy is extracted from geothermal brines by direct contact with a working fluid such as isobutane which is immiscible with the brine in a geothermal boiler. The geothermal boiler provides a distributor arrangement which efficiently contacts geothermal b... | 04/27/1982 |
| 4324102 | Process and system for recovery of energy from geothermal brines and other hot water sources Process and system for recovery of energy from geothermal brines and other hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a hydrocarbon working fluid, e.g. n-butane, in a heat transfer column, the heat ... | 04/13/1982 |
| 4315402 | Heat transfer process and system Direct contact heat transfer process and system for recovery of energy from geothermal brines or other hot aqueous solutions of a non-volatile solute, or for desalination, using staged evaporator-condenser units operating with a low boiling water-immiscib... | 02/16/1982 |
| 4297847 | Conversion of geothermal energy from subterranean cavities Geothermal energy is recovered by (1) introducing into a subterranean heat exchange medium which is in heat exchange with a high temperature formation a liquified vapor which will vaporize at the conditions of the medium; (2) vaporizing the liquified vapo... | 11/03/1981 |
| 4276748 | Recovery of energy from geothermal brine and other hot water sources Process and system for recovery of energy from geothermal brines and other hot water sources, by direct contact heat exchange between the brine or hot water, and an immiscible working fluid, e.g. a hydrocarbon such as isobutane, in a heat exchange column,... | 07/07/1981 |
| 4272961 | Recovery of energy from geothermal brine and other aqueous sources A process and system for recovery of energy from geothermal brines or other hot aqueous solutions of a non-volatile solute, by direct contact heat transfer using staged evaporator-condenser units operating with a low boiling water-immiscible liquid hydroc... | 06/16/1981 |
| 4213302 | Process and system for recovery of energy from geothermal brines and other water containing sources Process and system for recovery of energy from geothermal brines and other water containing or hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a working fluid, e.g. n-butane, in a heat transfer column, t... | 07/22/1980 |
| 4167099 | Countercurrent direct contact heat exchange process and system Recovery of energy from geothermal brines and other hot water sources by direct contact heat exchange with a working fluid, such as a hydrocarbon working fluid, e.g. isobutane. The process and system consists of a plurality of stages, each stage including... | 09/11/1979 |
| 4149385 | Well stimulation and systems for recovering geothermal heat The flow from geothermal wells is stimulated by injecting a liquid at selected levels in the well with the liquid having a boiling point below the temperature of the geothermal fluid at the levels of injection at the operating pressure at the levels of in... | 04/17/1979 |
| 4144715 | Method of producing mechanical energy from geothermal fluids A method for producing mechanical energy from geothermal fluids in which a heat transfer fluid (HTF) is heated by direct contact with the hot geothermal fluids, thereby partially cooling the geothermal fluids. A working fluid is heated by direct contact w... | 03/20/1979 |
| 4120158 | Power conversion and systems for recovering geothermal heat A process for the conversion of geothermal heat energy into electrical power by advantageously combining direct and indirect heat exchange systems and other systems to maximize the power production is presented herein. More specifically, a process and sys... | 10/17/1978 |
| 4089175 | Process and system for recovery of energy from geothermal brines and other water containing sources by direct contact with a working fluid below the critical pressure Process and system for recovery of energy from geothermal brines and other water containing or hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a working fluid, e.g. n-butane, in a heat transfer column, t... | 05/16/1978 |
| 4084379 | Energy conversion system An energy conversion system for the production of power from hot fluid sources which may contain dissolved solutes and undesirable noncondensable gases is disclosed in which direct heat transfer is utilized by said hot fluid sources to vaporize a working ... | 04/18/1978 |
| 4079590 | Well stimulation and systems for recovering geothermal heat The flow from geothermal wells is stimulated by injecting a liquid at selected levels in the well with the liquid having a boiling point below the temperature of the geothermal fluid at the levels of injection at the operating pressure at the levels of in... | 03/21/1978 |
| 4063418 | Power producing system employing geothermally heated fluid A power producing system includes a source of geothermally heated fluid having inorganic salts dissolved therein. The fluid is directed through a first direct contact heat exchanger in heat transfer relation with a working fluid of a type insoluble in a l... | 12/20/1977 |
