Hydrogeochemical Modelling of Aquifer Heat Storage Systems

Thomas Baumann1, Martina Ueckert1, Thorsten Hörbrand1
1 Institut für Wasserchemie, Technische Universität München

O 3.3 in Deep geothermal energy and deep groundwater

23.03.2018, 16:15-16:30, 2

Energy storage systems are a key element in the transition process from fossil fuels to highly dynamic renewable energy sources, because they can level energy production and demand. Aquifer heat storage systems can increase the flexibility of combined heat and power production, either with gas turbines or geothermal power plants.
In contrast to small scale surface level storage systems the working fluid cannot be chosen freely and reactions within the storage systems have to be taken into account. These quickly become the limiting factors for such systems, especially if a highly dynamic operation of the aquifer storage system is planned.
The models that we present are based on long term observations of deep hydrogeothermal facilities in the carbonates in the Molasse Basin, a large scale heat storage test and an in depth assessment of the thermodynamic databases and the implementation of the model codes.
Using the calibrated and rather robust models, the short term and long term behaviour of heat storage systems can be predicted and countermeasures can be developed. On a regional scale, the hydrogeochemical limits for aquifer storage systems can be assessed.

BAUMANN, T., BARTELS, J., LAFOGLER, M. & WENDEROTH, F. (2017) Assessment of heat mining and hydrogeochemical reactions with data from a former geothermal injection well in the Malm Aquifer, Bavarian Molasse Basin, Germany, Geothermics, 66, 50-60.

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