Geothermal heating center in Neubrandenburg

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Geothermal heating center

The geothermal heating center (GHZ) in Neubrandenburg was a pilot project of the GDR for the use of geothermal energy when it became apparent that the lignite stocks in the country were running out. After drilling in 1985/86, since 1989 (another source speaks of 1987), thermal water extracted from the depths has been used for district heating . However, additional heating was required. From 2001 to 2004 the system was expanded into a long-term geothermal deep storage facility . Since then, excess heat from a combined cycle power plant has been stored in the depths in summer and used to heat households in winter.

location

The geothermal heating center is located in a region which is considered one of the three regions in Germany that meet the requirements for geothermal projects.

history

In the GDR , heat and electricity were mainly generated by burning domestic brown coal, but the exhaustion of these coal seams was foreseeable. In the late 1980s, it was estimated that supplies would last for about 40 years. It is not surprising that the GDR actively looked for alternatives despite its financial difficulties. In the search for crude oil one came across thermal water , which was decided to be used for district heating. Geothermal heating plants were built in Waren (Müritz) , Neubrandenburg and Prenzlau . Further locations were planned in Neustadt-Glewe and Neuruppin until the fall of the Wall .

In 1985/86, four geothermal wells (Gt N1 to Gt N4) were carried out in Neubrandenburg with production and injection wells in the Hettang and Postera sandstone layers .

The geothermal heating center was operated in 1987/89 with the injection wells Gt N3 / 86 (upper Postera sandstone) and Gt N4 / 86 (Hettang sandstone) and the production wells Gt N1 / 86 (Postera sandstone) and Gt N2 / 85 (Hettang sandstone) added. The latter borehole was abandoned after a short time due to technical problems, so that until 2001, with intermittent interruptions, only the Postera sandstone layer was used to pump the thermal water. Around 75 m³ of water per hour were pumped from the depths, heated conventionally and, after passing through the heating system, fed back into the ground into the injection well. There are also two wells from 1988 that are not used for production but are used for observation purposes.

From 2001 to 2004 the facility was converted into a geothermal deep storage facility. For this purpose, the Gt N4 well was deepened by 100 meters to the depth of the previous Gt N3 well, which was only 5 meters away above ground. Gt N3 itself was filled up to the Aalen sandstone and is now used for balneological purposes. The deep heat storage facility was put into operation in summer 2004. A gas and steam turbine power plant built in 1997 was integrated into the geothermal water cycle through renovation measures . Since then, in the summer months, the excess heat from the power plant has been used to heat the water extracted from the depths and store it underground so that it can then be used for district heating in winter.

Technical specifications

The production well is approximately 1250 meters deep and the injection wells 1120 to 1250 meters deep. Production and injection wells are about 1200 meters apart both above and below ground. The underground thermal water has a salt content of 130 g / l and a temperature of 54 ° C. This is heated to 80 ° C in the summer months and stored underground. By reversing the water cycle, it can be used for district heating in winter with a temperature of 65 to 78 ° C.

Individual evidence

  1. ^ Electricity from geothermal energy stern.de, August 25, 2007.
  2. ↑ Prof. Michael J. Ziemann "The Sins of the Fathers" (DOC file, German translation; 194 kB).
  3. ↑ geothermal energy in Germany on udo-leuschner.de.

Web links

Commons : Geothermal Heizzentrale Neubrandenburg  - collection of pictures, videos and audio files

Coordinates: 53 ° 33 ′ 32.9 "  N , 13 ° 14 ′ 51.3"  E