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Download GeothermalPresentation - Snohomish County Public Utility
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Mrs. Hislop Snohomish County PUD Several slides adapted from educational resources offered through the Geothermal Education Office. Geo = EARTH Thermal = HEAT Crust Mantle Outer core Inner core Geothermal Reservoir When Whenthe thehot hotwater waterand andsteam steamaccumulate accumulatein inpermeable permeableand andporous porousrock, rock,aageothermal geothermal reservoir reservoirforms. forms. Plate Boundaries “Ring of Fire” Hottest Known Geothermal Regions What’s Needed for a Geothermal Power Plant? • Heat in the earth • Fluid • Permeable rock reservoir • Access to the reservoir • Energy conversion plant to generate the electricity Dry Steam Power Plant Turbine Generator Electricity Steam Condensed Steam (Water) In Indry drysteam steampower powerplants, plants,the theunderground undergroundsteam steam(and (andno nowater) water)shoots shootsup upthe thewells wellsand and blasts blastsinto intothe theturbine. turbine.Dry Drysteam steamfields fieldsare arerare rareand andrequire requireunderground undergroundtemperatures temperatures higher higherthan than500 500degrees degreesFahrenheit. Fahrenheit. Flash Steam Power Plant Steam Turbine Generator Flash Tank Hot Water Electricity Sepa rate Wat d er Condensed Steam (Water) Flash Flashsteam steampower powerplants plantsuse usehot hotwater waterreservoirs. reservoirs.In Inthese theseplants, plants,as asthe thehot hotwater waterisis released releasedfrom fromthe thepressure pressureof ofthe thedeep deepreservoir, reservoir,some someififititflashes flashesinto intosteam. steam.This Thissystem system requires requiresunderground undergroundtemperatures temperaturesof of300-700 300-700degrees degreesor orhotter. hotter. Binary Cycle Power Plant Turbine Binary Vapor Generator Electricity Binary Liquid Heat Exchanger Hot Water Cooled Water InInaabinary binaryplant plantheat heatfrom fromgeothermal geothermalwater watertransfers transfersto toaasecond second(binary) (binary)liquid, liquid,which whichflashes flashesto to steam at a lower temperature than water. This allows us to use reservoirs that have underground steam at a lower temperature than water. This allows us to use reservoirs that have underground temperatures temperaturesbetween between250-360 250-360degrees degreesFahrenheit. Fahrenheit.The Theforce forceof ofthe theexpanding expandingvapor vaporspins spinsthe the turbine. This is a completely closed system so nothing is ever released into the air. turbine. This is a completely closed system so nothing is ever released into the air. Station Two: Venn Diagram CO2 Emissions Comparison (lbs/MW‐hr) Coal 2000 Oil 1500 Natural gas 1000 500 Geothermal 0 Source EIA 1998; Bloomfield and Moore 1999 Producing electricity from a geothermal power plant emits only 0-4% per megawatt of the CO2 emitted by a fossil fuel power plant. Binary power plants have virtually no emissions. Benefits of Geothermal Power • Clean energy‐ no air pollution • Renewable and sustainable energy that can be generated 24 hours/day • Can be generated locally and easily integrated into the electrical grid for homes and businesses • Conserves fossil fuels • Potential resource development in Western Washington is substantial. We are in a good location for geothermal reservoirs!
