Patent ID: 6247312
Filing Date: 2001-06-19
Classification: F03G,Y02E

Abstract:
A system for an isolated geographic area such as an island having a source of geothermal fluid that produces steam containing non-condensable gases, and brine, said system comprising:a) a plurality of battery operated vehicles for traversing said area, each vehicle being provided with a battery, a charge level detector for determining the charge level on said battery, an alarm, and control means for operating the alarm when the charge level on said battery falls to a threshold;b) a plurality of charging stations located in said area for recharging the batteries of said vehicles;c) an electrical grid for distributing power to said geographical area which requires more power during the day than at night; andd) a geothermal power plant for supplying power to said grid at a substantially constant power level day and night, said power plant including at least one module comprising:(1) a steam turbine operating on steam from the source of geothermal fluid for producing power and heat depleted steam;(2) a steam condenser for receiving the heat depleted steam;(3) means for indirectly cooling the steam condenser with liquid organic fluid thereby producing vaporized organic fluid and steam condensate;(4) an organic vapor turbine operating on the vaporized organic fluid for producing power and heat depleted organic vapor;(5) an organic fluid condenser for condensing the heat depleted organic vapor into liquid organic fluid;(6) means for returning said organic liquid to the steam condenser; and(7) a preheater for preheating the organic liquid, before it is supplied to said steam condenser, with heat contained in the geothermal fluid.