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Turbine Vapour Separator Water Pump Production well Electricity Generator Vapour Discharge of vapour into the atmosphere Discharged water Back-pressure power plant: after separation of the vapour phase, the vapour obtained expands in a turbine and released into the atmosphere. Condensation power plant: the vapour obtained at the head of the production borehole powers the turbine. It is then condensed at the turbine outlet. Binary fluid geothermal power plant: the geothermal fluid transfers its heat inside an exchanger using an organic fluid which is vaporised at low temperature and expands in the turbine. Discovered a century ago, electricity generation using geothermal energy grew significantly in the 1970s and today accounts for 11,000 MW of power worldwide. The current technologies allow for electricity generation at lower and lower temperatures. Furthermore, there is a promising outlook for stimulated geothermal (“EGS”) sys- tems. Los Azufres II geothermal power plant in Mexico – Alstom Electricity generation in volcanic Areas Geothermal electricity generation is based on the exploitation of deposits containing resources at temperatures of 100 to 350 °C in regions of active volcanism. On these sites, the vapour produced at the head of the borehole powers a tur- bine and an alternator which generates electricity.The condensed fluid is then rein- jected into the deposit to optimise the operating period. HIGH-ENERGY GEOTHERMAL POWER FOR ELECTRICITY GENERATION Vapour Condenser Air Pump Production well Injection well Turbine Generator Electricity Discharge of vapour into the atmosphere Cooling Cooling water tower Water Condensate Air Alstom is a global leader in the world of power generation, power transmission and rail infrastructure and sets the benchmark for innovative and environmentally friendly techno- logies. Pioneer in the exploitation of geothermal energy, Alstom supplies the engineering, the equipment and the construction of geothermal solutions, since the supply of turbines until the construction and the maintenance of the power plant. The group has installed more than 380 MW of geothermal electricity capacity worldwide. Alstom’s projects include the plants of Los Humeros (Mexico 2009), Los Azufres (Mexico 2000), Las Tres Virgenenes (Mexico 1998), Lahendong (Indonesia 1995), Bouillante (French West Indies 1980) and Wairakei (New Zealand 1958). Appointed in 2000 by the Mexican Government, the geothermal power plant of Los Azufres II is one of the most cost-effective sources of energy available in Mexico.Through a turnkey project,Alstom provided all of the engineering, services, the construction of the site, supply of the steam turbine as well as the system of control for the four 25 MW units. Los Azufres II plant makes use of drilled wells to extract steam from a depth of up to 4500 meters where the geothermal reservoir is located.The power plant began commercial operations in 2003, all the combined units feeds the nation’s electrical distribution grid, with more than 800 GW of electricity a year of clean and reliable electricity. Los Azufres geothermal power plant in Mexico – Alstom. Turbine Organic fluid Heat exchanger Pump Production well well Generator Electricity Discharge of vapour into the atmosphere Condenser Air Cooling water Air Water Cooling tower Injection © ADEME - BRGM © ADEME - BRGM © ADEME - BRGM © AlstomPDF Image | GEOTHERMAL ENERGY District heating
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