Albrecht Leis
Graz University of Technology
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Featured researches published by Albrecht Leis.
Geothermal Energy | 2017
Ronny Boch; Albrecht Leis; Edith Haslinger; Johann E. Goldbrunner; Florian Mittermayr; Heinz Fröschl; Dorothee Hippler; Martin Dietzel
BackgroundMineral precipitates (scaling) from deep saline thermal waters often constitute a major problem during geothermal energy production. The occurrence of scale-fragments accumulating and clogging pipes, filters, and heat exchangers is of particular concern regarding an efficient energy extraction.MethodsCarbonate scale-fragments from different sections of two geothermal power plants were collected and studied in a high-resolution scaling forensic approach comprising of microstructural characterization, elemental mapping, and stable carbon and oxygen isotope transects. The solid-phase analyses were evaluated in the context of natural environmental and technical (man-made) production conditions.Results and discussionOur results indicate an interaction of metal sulfide mineral layers mainly from H2S corrosion of the steel pipes and CaCO3 nucleation and crystal growth. A conceptual model of scale-fragment development addresses the relevance of two key interfaces: 1) the corrosion layer between the steel substrate and calcite scale and 2) the scale surface versus thermal fluid flow. The corrosion products constitute an attractive crystallization substrate of brittle and mechanically weak consistency. A rough carbonate scale surface tends to induce (micro) turbulences and increased flow resistance (frictional forces). These factors promote partial exfoliation, scale-fragment mobilization, and rapid clogging. This investigation highlights the potential of detailed petrographic and geochemical analyses of mineral precipitates for evaluating favorable versus unfavorable processes in geotechnical environmental settings.
Sedimentology | 2017
Ann-Christine Ritter; Vasileios Mavromatis; Martin Dietzel; Ola Kwiecien; Felix Wiethoff; Erika Griesshaber; Laura A. Casella; Wolfgang W. Schmahl; Jennifer Koelen; Rolf D. Neuser; Albrecht Leis; Dieter Buhl; Andrea Niedermayr; Sebastian F.M. Breitenbach; Stefano M. Bernasconi; Adrian Immenhauser
Archive | 2012
Florian Mittermayr; Thomas Rinder; Dietmar Klammer; Albrecht Leis; Martin Dietzel
Archive | 2008
Martin Dietzel; Thomas Rinder; Andrea Niedermayr; Florian Mittermayr; Albrecht Leis; Dietmar Klammer; Stephan Köhler; Peter Reichl
Archive | 2010
A. Niedermayr; Martin Dietzel; Basak Kisakurek; Florian Böhm; Stephan Köhler; Albrecht Leis; Andrew C. Eisenhauer
Archive | 2018
Ronny Boch; Albrecht Leis; Florian Mittermayr; Sanja Simic; Stefanie Eichinger; Cyrill Grengg; Dorothee Hippler; Martin Almer; Martin Dietzel
Pangeo 2014 | 2014
Daniel Thaller; Florian Mittermayr; Andre Baldermann; Attila Demény; Albrecht Leis; Martin Dietzel
Archive | 2014
Florian Mittermayr; James M. Aldred; Albrecht Leis; Martin Dietzel
Eurocorr 2014 | 2014
Cyrill Grengg; Florian Mittermayr; Andre Baldermann; Albrecht Leis; Michael E. Böttcher; Martin Dietzel
Archive | 2010
Albrecht Leis; Martin Dietzel; Rifaat Abdalla; J. P. Savarino; Michael E. Böttcher; Stephan Köhler