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A new life for underground mines: the Reiche Zeche geo-lab for in-situ simulation of mine thermal energy storage (MineATES)
Zeit:
Dienstag, 03.09.2024:
10:40 - 10:55
Chair der Sitzung: Sebastian Westermann
Ort:Raum 110
Präsentationen
A new life for underground mines: the Reiche Zeche geo-lab for in-situ simulation of mine thermal energy storage (MineATES)
Alireza Arab1,2, Martin Binder1,2, Oppelt Lukas1,2, Christian Engelmann1,2, Chen Chaofan1,2, Tobias Lotter1,2, Christoph Späker1,2, Frank Schenker1,2, Rebekka Wiedener1,2, Grab Thomas1,2, Traugott Scheytt1,2
1TU Bergakademie Freiberg, Deutschland; 2Zentrum für Wasserforschung Freiberg (ZeWaF)
Thermal Energy Storage (TES) offers a promising method for temporarily storing surplus heat and cold, with traditional systems using natural aquifers. A novel approach, "Mine Thermal Energy Storage" (MTES), utilizes cavities in [partially] flooded underground mines. While both Aquifer Thermal Energy Storage (ATES) and MTES are promising, they face challenges such as clogging, scaling, corrosion, and energy loss. These issues affect the geological matrix and the integrity of infrastructure components like pipes and heat exchangers.
The "MineATES" project, funded by the German Federal Ministry of Education and Research (BMBF), investigates MTES feasibility and limitations. A geo-lab has been established in the former silver mine "Reiche Zeche" (Himmelfahrt Fundgrube) at TU Bergakademie Freiberg in Saxony. The lab features a reservoir with a capacity of approximately 21 cubic meters, located at the first level of the mine, slowly permeated by acidic water with a pH of 2 to 3. The surrounding Freiberg gneiss hosts a comprehensive thermal monitoring system, comprising over 90 temperature sensors across 18 boreholes embedded up to two meters deep, continuously detecting heat transport in and out of the rock during TES cycles.
Initial experiments observed an average background temperature of around 12°C. Sensors effectively captured heat movement during two consecutive heating cycles, enabling the study of heat losses and efficiency during heat/cold injections and extractions, simulating real-world TES conditions. Additionally, hydrochemical monitoring was set up to observe changes in the reservoir's chemistry.
Parallel lab-scale experiments, including column flow and batch reactor tests, simulate TES cycles, heating columns up to 60°C and cooling to 10°C. Batch experiments revealed that 90% of dissolved iron precipitated during the cycles, corroborating field observations. The primary goal of these experiments is to understand the nature and extent of potential chemical changes during TES operations.
