Sustainable Energy Science and Engineering Center GEOTHERMAL ENERGY. Sustainable Energy Sources. Source:
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1 Sustainable Energy Sources GEOTHERMAL ENERGY
2 Earth s Temperature Profile
3 GEOTHERMAL ENERGY
4 Plate Tectonics Earth's crust is broken into huge plates that move apart or push together at about the rate our fingernails grow. Convection of semi-molten rock in the upper mantle helps drive plate tectonics.
5 Plate Tectonics New crust forms along mid-ocean spreading centers and continental rift zones. When plates meet, one can slide beneath another. Plumes of magma rise from the edges of sinking plates.
6 Magma Thinned or fractured crust allows magma to rise to the surface as lava. Most magma doesn't reach the surface but heats large regions of underground rock.
7 Rain Water Effect Rainwater can seep down faults and fractured rocks for miles. After being heated, it can return to the surface as steam or hot water.
8 Steaming Ground This steaming ground is in the Philippines.
9 Geysers Examples of geothermal heat Requirements: Deep subterranean supply of water Source of heat Series of fissures and fractures to surface Regular interval geysers are indicators of earthquakes within 500 miles Old Faithful at Yellowstone
10 Geothermal Reservoir When the rising hot water and steam is trapped in permeable and porous rocks under a layer of impermeable rock, it can form a geothermal reservoir. Geothermal reservoirs can reach temperatures of 370 o C.
11 GEOTHERMAL ENERGY
12 Geothermal Well This photograph shows a vertical geothermal well test in the Nevada Desert.
13 Geothermal Plant Natural steam from the production wells power the turbine generator. The steam is condensed by evaporation in the cooling tower and pumped down an injection well to sustain production.
14 Turbine Generator Sustainable electricity production with no fuels are burned.
15 Outdoor Turbine Generator Turbine generator outdoors at an Imperial Valley geothermal power plant in California.
16 Environment These geothermal plants are operating successfully in a Philippine cornfield, at Mammoth Lakes, Calif., in the Mojave Desert of California, and in a tropical forest, at Mt. Apo, Philippines.
17 Power Plant Types Dry Steam: In dry steam power plants, the steam (and no water) shoots up the wells and is passed through a rock catcher and then directly into the turbine. Dry steam fields are rare. Flash Stream: Flash steam power plants use hot water reservoirs. In flash plants, as hot water is released from the pressure of the deep reservoir in a flash tank, some of it flashes to steam. Binary Cycle: In a binary cycle power plant, the heat from geothermal water is used to vaporize a "working fluid" in separate adjacent pipes. The vapor, like steam, powers the turbine generator.
18 Geothermal Power
19 Global Geothermal Power Geothermal power plants are producing over 8,200 MW of electricity in 21 countries
20 Pollution Reykjavik, Iceland - picture taken in 1932 when buildings were all heated by burning of (imported) fossil fuels.
21 Towards Sustainable Energy Today, about 95% of the buildings in Reykjavik are heated with geothermal water. Reykjavik is now one of the cleanest cities in the world.
22 Geothermal Resource
23 US Geothermal Potential
24 Heat Pumps Use 40-60% less energy than standard heat pumps More expensive to install than standard systems
25 Drawbacks Environmental Dissolved in natural water: CO 2 and N 2 H 2 S (oxidizes to SO 2 and H 2 SO 4 ) Rn (from rocks containing uranium) NH 3 B Hg, HgS Dissolved in steam: CO 2 H 2 S, HCl, HF NH 3 CH 4
26 Ground water pollution From system leakage (NH 3 ) From brines (when discharged into natural waters) Cl -, F -, Br -, I - SO 4 2- HCO 3 - Ca 2+, Mn 2+, Fe 2+ Land subsidence - from withdrawal of fluids Induced seismicity Drawbacks Environmental Low-level earthquakes from withdrawal and re-injection of fluids Noise - during drilling operations and pump testing
27 Drawbacks Sustainability Geothermal energy uses stored heat in uppermost crust (~ 5 km) that has accumulated over a long period of heat diffusion and warming Average heat flow in the earth is insufficient to sustain geothermal retrieval for long periods of time Long term geothermal retrieval results in slow cooling of the heat exchange region at reservoir depth Exception is in volcanic and sub-volcanic regions A 2-hole exchange system with 0.5 to 1.5 km spacing is expected to last 20 years Ambient temperature in the exhausted volume will gradually be restored when it is abandoned Heat exchange volumes can also degrade by poor reservoir management, precipitation of minerals, compaction of exhausted volumes.
28 Summary Positives Exists everywhere Low (no) emissions Wide range of utilities Independent of weather or climate Negatives Expensive exploration Requires the use of brines that are corrosive and poisonous Sensitive to underground disturbances (earthquakes, volcanism) Limited lifetime
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