This project investigates the technical and economical implementation of a novel thermal storage concept. The excess heat loss of the warm months is to be used and stored, in order to make it usable in the cold months.
The goal of this R&D project is to create a technically and economically feasible conceptual model for a Mine Thermal Energy Storage (Geo-MTES) for the energetic reuse of a mine on the example of the Prosper-Haniel hard coal mine in Bottrop, Germany.
At the end of 2018, the last operative hard coal mine in Germany (Prosper-Haniel), is going to be closed down, plugged and abandoned. Large amounts of subsurface infrastructure, resembled mainly by open parts of former galleries and mining faces are going to be flooded after the mine is closed down and therefore have the potential to become an enormous geothermal reservoir for seasonal heat storage. During the summer non used heat from solar thermal power plants, garbage incineration, combined heat and power plants (CHP) or industrial production processes can be stored within dedicated drifts of the mine. During the winter season this surplus heat can be extracted and directly utilized in single construction complexes and in city areas, which are not connected to the existing district heating grid.
For the implementation of such a MTES within a former hard coal mine, the corresponding infrastructure measures and appropriate circulation applications have to be developed. Precondition for this development is the presence of a still active and fully open mine, which is resembled by the Proper-Haniel hard coal mine (accessible till the end of 2018). An investigation of the most relevant geotechnical, hydrogeological and geophysical parameters of the Prosper-Haniel hard coal mine is going to be performed. As a foundation for the implementation of a seasonal heat storage the undisturbed rock temperatures range between 30°C and well over 50°C within the galleries and mining faces that are going to be flooded, after the mine is fully closed down. The total mining area consists of 165 km2 and the subsurface galleries have a total length of 141 km, at a maximum depth of more than 1200 m. Prosper-Haniel is accessible via four vertical shafts and a conveyor system leading into the mine. These open shafts and drifts allow a comparatively easy accessibility and technical feasibility of a MTES.
reference: ©2017 GeothermieZentrumBochum e.V.
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