Opportunities for Geothermal Development Created by New Technologies S2-1-2
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1 Opportunities for Geothermal Development Created by New Technologies S2-1-2
2 Geothermal Academy Masami Nakagawa Director of Geothermal Academy Fulbright Energy Specialist CSM/NREL Joint Appointee Department of Mining Engineering Colorado School of Mines Golden, Colorado National Renewable Energy Laboratory (NREL)
3 CSM MISSION Colorado School of Mines role and mission has remained constant and is written in the Colorado statute as: The Colorado School of Mines shall be a specialized baccalaureate and graduate research institution with high admission standards. The Colorado School of Mines shall have a unique mission in energy, mineral, and materials science and engineering and associated engineering and science fields. The school shall be the primary institution of higher education offering energy, mineral and materials science and mineral engineering degrees at both the graduate and undergraduate levels. (Colorado Revised Statutes, Section )
4 Geothermal Education Office
5 WHAT IS GEOTHERMAL? Geothermal energy draws sustainable power from the natural heat of the earth. It is the thermal energy contained in the rock and fluid (that fills the fractures and pores within the rock) in the earth s crust. It is believed that the ultimate source of geothermal energy is radioactive decay occurring deep within the earth. The presence of volcanoes, hot springs, and other thermal phenomena are surface evidence of our planet s heat resource.
6 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.
7 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.
8 Hydrothermal Geothermal Resources
9 Drilling cost is the major challenge
10 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.
11 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 if it flashes to steam.
12 In a binary cycle power plant (binary means two), the heat from geothermal water is used to vaporize a "working fluid" in separate adjacent pipes. The vapor, like steam, powers the turbine generator.
13 US DOE Geothermal Technology Program EERE: Energy Efficiency and Renewable Energy Identify new geothermal opportunities Accelerate a commercial pathway to EGS Overcome development barriers Additive value Subsurface engineering crosscut
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15 Enhanced Geothermal Systems An Enhanced (or Engineered) Geothermal System (EGS) is a man-made reservoir, created where there is hot rock but insufficient or little natural permeability or fluid saturation. A 2006 MIT study shows that in the US alone, 100GWe of cost-competitive capacity could be provided by EGS in the next 50 years.
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17 Benefits of EGS 1. EGS has the potential to be an important contributor to the US energy portfolio as a source of clean, renewable energy. 2. EGS emits little to no greenhouse gases. Most geothermal power plants use a closed-loop binary cycle power plant and have no greenhouse gas emissions other than water vapor that may be used for cooling. 3. EGS could facilitate geothermal development outside of traditional hydrothermal areas in the western US, thereby extending geothermal energy production nationwide. 4. EGS can supply base load energy with limited to no intermittency, eliminating the need for energy storage technologies.
18 Induced Seismicity --- Public Concern During EGS reservoir creation and stimulation, rocks may slip along pre-existing fractures and produce microseismic events. Researchers have found these microseismic events, also known as Induced seismicity, to be a very useful diagnostic tool for accurately pinpointing where fractures are re-opened or created, and characterizing the extent of a reservoir. In almost all cases, these events occur in deep reservoirs and are of such low magnitude that they are not felt at the surface. DOE Induced Seismicity Protocol
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22 Cascading Use of Geothermal Resources
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