Geothermal power plant Neustadt-Glewe
| Geothermal power plant Neustadt-Glewe | |||
|---|---|---|---|
 |
|||
| location | |||
|
|||
| Coordinates | 53 ° 22 '12 " N , 11 ° 35' 11" E | ||
| country | Germany | ||
| Data | |||
| Type | Geothermal power plant | ||
| Primary energy | Geothermal energy | ||
| power | 230 kilowatts | ||
| operator | Erdwärme-Kraft GbR | ||
| Start of operations | 1994 heat supply and 2003 electricity generation | ||
| Shutdown | 2009 power generation | ||
| turbine | ORC turbine | ||
| Energy fed in since commissioning | 2004 GWh | ||
| Website | www.erdwaermekraft.de | ||
The Neustadt-Glewe geothermal power plant was the first power plant in Germany to use geothermal energy from the thermal water to generate electricity. The power generation was operated from 2003 to 2010 by "Erdwärme-Kraft GbR", a subsidiary of Vattenfall Europe Berlin . In 2010 the power generation plant was shut down due to a technical defect and the associated inefficiency. The heat supply system in Neustadt-Glewe is of primary importance . The plant has been operated by WEMAG AG ( Schwerin ) since 1994 and economically supplies households and businesses with around 20 GWh of heat annually.
Technical specifications
The installed capacity to generate electricity was 230 kW . With an added geothermal heat output of a maximum of approx. 2200 kW, a gross electrical efficiency of 7.4% is calculated with a maximum of 165 kW power generation (95.4 ° / 70.4 ° C). Taking into account the system's own requirements of around 125 kW (feed pump with approx. 100 kW and cooling water and feed pump approx. 25 kW), the net output was 40 kW. These very low values are the result of the low thermal water temperatures of around 96 ° C on the surface.
The plant was operated as a combined heat and power plant in combination with the Neustadt-Glewe geothermal heating plant, which was commissioned in 1994 . The had district heating priority over power generation, during the summer months a full load operation was possible so and was used during the transitional period and in winter only that thermal water energy to generate electricity, which was not necessary for district heating. With this principle, the thermal water energy could be optimally used all year round and the overall efficiency could be significantly improved.
The power plant worked with the world's lowest thermal water temperature of approx. 96 ° C and consists of the components
- Heavy organic matter evaporator C5F12
- single-stage turbine with generator (3000 / min)
- water-cooled condenser.
The cooling water for the condenser is recooled via two wet cooling towers. The cooling tower make-up water (evaporation, blowdown) is secured by groundwater and treated in a water treatment plant. In 2004 the power plant, which works according to the Organic Rankine Cycle (ORC) principle, generated around 450 MWh of electrical energy. The power plant for generating electricity has been shut down for good since 2009 due to technical damage. The low level of efficiency of the system is uneconomical for reinvestment. Due to the comparatively low temperatures, the geothermal power plant cannot be operated economically. The geothermal heating plant, on the other hand, will continue to be operated economically.
Geology and layout of the borehole
In Neustadt-Glewe, the strata of the earth, from which the thermal water is extracted, are the Keuper and the Rätkeuper at a depth of 2,455 meters. The injection well leads the cooled water to a depth of 2335 meters. The salt content of the brine is 220 grams per liter. The delivery and return points of the vertical boreholes are 1500 meters apart.
Electricity generation in the ORC process
The low thermal water temperature requires a special liquid (a synthetic, organic substance) as a medium, which, unlike water, does not boil at 100 ° C, but at around 30 ° C. With its steam (instead of water vapor), the turbine is operated, which in turn drives the electricity generator. The steam is then cooled, liquefied and fed back to the heat exchanger , where it is reheated with fresh thermal water. This is called the Organic Rankine Cycle process.
See also
- As the first industrial geothermal power plant in Germany, the geothermal power plant Landau with 3 megawatt power generation capacity was built in 2007 as a successor to Neustadt-Glewe in Landau in the Palatinate . This was also the first in the Upper Rhine Plain development area . As in Neustadt-Glewe, the ORC process is used there.
- In the third major German geothermal area in the foothills of the Alps, the South German Molasse Basin in 2009 could Unterhaching power generation of geothermal power plant Unterhaching be put into operation. The Kalina cycle is being used there for the first time in Germany .
Sources and individual references
Web links
- Website of the power plant operator
- S. Koehler Analysis of the Combined Heat and Power Plant Neustadt-Glewe Proceedings World Geothermal Congress 2005, Antalya, Turkey, April 24-29, 2005
- Egbert Broßmann, Marc Koch First Experiences with Geothermal Power Plant in Neustadt-Glewe (Germany) Proceedings World Geothermal Congress 2005, Antalya, Turkey, April 24-29, 2005
- ↑ [1]
- ↑ [2]
- ↑ http://www.ie-leipzig.com/IE/Geothermie/Portal/Projekte/Neustadt-Glewe.pdf ( Memento from April 9, 2011 in the Internet Archive )
- ↑ ? ORC technology ( Memento from June 29, 2012 in the Internet Archive )
- ^ Information from bine to Neustadt-Glewe
- ↑ Possibilities of geothermal electricity generation in Germany; February 2003; Office for Technology Assessment at the German Bundestag (TAB) (PDF; 3.3 MB)
7. Egbert Broßmann, Marc Koch First Experiences with Geothermal Power Plant in Neustadt-Glewe (Germany) Proceedings World Geothermal Congress 2005, Antalya, Turkey, April 24-29, 2005