Aquifer Thermal Energy Store (ATES) for a Gas and Steam Turbine Cogeneration Plant Neubrandenburg

 

Client:
Neubrandenburger Stadtwerke GmbH

John-Schehr-Strasse 1

D-17033 Neubrandenburg

 

Land/Region: Germany

 

Period: 2000 - 2004

 

Investment: Euro 2,700,000

Project Description:
Efforts aiming at minimizing the primary energy use through the coupling of different processes of energy transformation (e.g., cogeneration of heat and power) are often hindered by the seasonal discrepancy of energy offer and energy demand. Efficient long-term heat and cold stores which can be installed at low specific cost may help here.

 

In Neubrandenburg, the underground serves as such a store to the 77 MWel Gas and Steam Turbine Heat and Power Plant. In summer, the surplus heat arising from the power plant – which otherwise would be eliminated via the cooling tower – is fed into the underground. For that, water at a temperature of approx. 45 °C is produced from a „cold“ well, heated, and injected afterwards in the „warm“ well forming an artificial „geothermal zone“ there. The direction of flow in the system is reversed in winter. The heat produced now from the “warm” well has (at small losses) an initial temperature of approx. 85 °C and of 75 °C at the end of the discharging period. The heat is supplied to a low-temperature network displacing here the operation of the gas burners in the peak-load boilers.

GTN Services:

  • Numerical simulation of the operation of the aquifer store
  • Design, call for bids and supervision of the construction of the ATES incl. piping, electrical and automation installations
  • R&D and  continuous monitoring of the operartional water data, scales and applied materials

Facts and Figures:

  • Aquifer thermal energy store
  • Efficient horizon: Hettangian
  • 2 wells
  • Internal distance oft he wells 1,300 m
  • Depth 1,200 - 1,300 m
  • Flow rate 100 m³/h
  • Charging temperature up to 90°C
  • Discharging temperature 85°C - 75°C
  • Rated capacity of the heat consumers (flats, university) 12,000 kW
  • Heating network temperatures 80°C/45°C
  • Rated geothermal capacity 4,000 kW
  • Heat charged into the store 12,000 MWh/a
  • Heat discharged from the store 8,800 MWh/a
PDF

 

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