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High Temperature Aquifer Storage in the Molasse Basin, Bavaria

Martina Ueckert1, Reinhard Nießner1, Thomas Baumann1
1 Institut für Wasserchemie, Technische Universität München

P 11.7 in Wärme-, Energie- und Kohlenstoffspeicherung im Untergrund

Combined heat and power generation (CHP) is highly efficient because

excess heat is used for heating and/or process energy. However, the
demand of heat energy is highly variable throughout the year while the
demand of electrical energy is rather constant. Unfortunately, at
higher ambient temperature the CHP has to be ramped down, since the
heat cannot be used.
 
Within the project "High temperature aquifer storage" scientists from
mechanical and electrical engineering, geology, hydrogeology, and
mathematics investigate storage and recuperation of excess heat energy
into the Malm aquifer in Bavaria. Pilot studies indicate that high
temperature energy storage is beneficial because of an increase of the
total working hours of the CHP and a significant reduction of the CO2
footprint.
 
Heat storage in a calcareous aquifer at injection temperatures above
100 °C is a challenge, not only because of the changes of the
carbonate equilibrium at all levels of the facility. Therefore, a
pilot scale heat storage test will be performed at an industrial
site. This test includes a push-pull tracer test with conservative and
reactive tracers and will later be expanded to a full scale
demonstration project.
 
Laboratory experiments in an autoclave and hydrogeochemical modelling
will provide the background for the pilot scale tests, especially with
regard to the handling of the waters at ground level and the behaviour
of the reservoir. Besides findings about transport and heating
behaviour in the core samples, the interaction of the injected tracers
with the matrix under reservoir conditions will be quantified. An
integrated camera system deliver information about precipitation
processes.

Letzte Änderung 31.10.2013