Geothermal hot water transportation and utilization system
First Claim
1. A geothermal hot water transportation system for transporting geothermal hot water from underground to above ground, comprisingmeans for pressurizing and pumping hot water from a geothermal production well to a location above ground including a downhole pump for installation in the geothermal production well, and a long downhole pump shaft;
- a pump casing having a below surface end connected to said down hole pump and an above surface end;
means for separating steam and hot water brought to the surface from the well by said downhole pump through said pump casing, including an above ground rotary separation two-phase flow turbine communicating with said above surface end of said pump casing, said two-phase flow turbine having a power output shaft means for directly powering said downhole pump through said downhole pump shaft.
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Accused Products
Abstract
Disclosed is a system for transporting geothermal hot water taken up at an underground bottom portion of a geothermal production well up to the ground surface, efficiently with a loss suppressed to minimum of the energy possessed by the geothermal hot water, which comprises a downhole pump disposed at an underground bottom portion of the geothermal production well for taking up and pressurizing the geothermal hot water and a rotary separation two-phase flow turbine adapted to be driven by the transported geothermal hot water, the downhole pump being adapted to be driven by the rotary separation two-phase flow turbine. Also disclosed is a system for utilization of underground geothermal hot water, which comprises a downhole pump disposed at an underground bottom portion of a geothermal production well and a rotary separation two-phase flow turbine for pressurizing geothermal hot water taken up and supplied thereto by the downhole pump and supplying pressurized geothermal hot water to a direct contact heat exchanger so as to generate power through the medium of a low boiling-temperature medium, while at the same time separating and supplying steam to a steam turbine to generate power, whereby a power generation by a binary cycle is carried out.
20 Citations
5 Claims
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1. A geothermal hot water transportation system for transporting geothermal hot water from underground to above ground, comprising
means for pressurizing and pumping hot water from a geothermal production well to a location above ground including a downhole pump for installation in the geothermal production well, and a long downhole pump shaft; -
a pump casing having a below surface end connected to said down hole pump and an above surface end; means for separating steam and hot water brought to the surface from the well by said downhole pump through said pump casing, including an above ground rotary separation two-phase flow turbine communicating with said above surface end of said pump casing, said two-phase flow turbine having a power output shaft means for directly powering said downhole pump through said downhole pump shaft. - View Dependent Claims (2)
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3. A geothermal hot water utilization method, comprising the following steps (i) to (v):
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(i) compressing geothermal hot water and supplying the compressed geothermal hot water to a rotary separating two-phase flow turbine by a downhole pump disposed below the evaporation water level in a geothermal hot water well, (ii) separating the geothermal hot water into hot water and steam through the rotary separation two-phase flow turbine, (iii) compressing the above separated hot water by a diffuser provided in the rotary separating two-phase flow turbine, supplying the compressed hot water (b) to a direct contact heat exchanger and, by letting said compressed hot water directly contact a low boiling-point medium to be jetted into the heat exchanger by the below recited step (v), vaporizing the low boiling-point medium, (iv) supplying said separated steam (a) to a steam turbine to drive the turbine, while supplying said vaporized low boiling-point medium from the above step (iii) to a low boiling-point medium turbine, to thereby generate power; (v) condensing exhaust gas from the low boiling-point medium turbine by a condenser, while supplying discharged hot water from the direct contact heat exchanger to a hydraulic turbine so as to drive the turbine by the pressure thereof and to raise the pressure of the low boiling-point medium condensed by the condenser by a pump driven by the hydraulic turbine, and jetting the pressure-raised low boiling-point medium into the direct contact heat exchanger in the above step (iii). - View Dependent Claims (4, 5)
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Specification