Scale-fragment accumulations blocking geothermal energy extraction - Interacting steel sulfide corrosion and calcite crystallization

Publikation: KonferenzbeitragPosterForschungBegutachtung

Abstract

Various minerals precipitating from deep saline thermal
water (scaling) often constitute a major obstacle during
geothermal energy production. The formation of scalefragments
in pipes, which accumulate and block pumps,
filters and heat exchangers, is of particular concern in power
plants hindering an efficient energy extraction. Carbonate
scale-fragments from different sections of two geothermal
facilities in S-Germany were studied in a high-resolution
scaling forensic approach including microstructural
characterization, elemental mapping and stable isotope
profiles. The obtained (isotope)geochemical data were
evaluated in the context of favorable vs. unfavorable natural
environmental and operational (man-made) production
conditions. Our results support a close relationship of metal
sulfide mineral layers forming from H2S corrosion of the steel
pipes and CaCO3 nucleation and rapid crystal growth. A
conceptual model of scale-fragment evolution is developed
considering two key interfaces: i) the corrosion layer between
steel and calcite scale; ii) the scale surface vs. thermal fluid
flow. The corrosion products with brittle and mechanically
weak consistency constitute an attractive substrate for
carbonate crystallization. The rough carbonate scale surface
promotes the occurrence of (micro)turbulences and higher
flow resistance (frictional forces). These effects can lead to
partial exfoliation, fragment mobilization, accumulation and
severe blocking.
Originalspracheenglisch
PublikationsstatusVeröffentlicht - 14 Aug 2017
VeranstaltungGoldschmidt Conference - Le Palais des Congrès, Paris, Frankreich
Dauer: 13 Aug 201718 Aug 2017

Konferenz

KonferenzGoldschmidt Conference
LandFrankreich
OrtParis
Zeitraum13/08/1718/08/17

Fields of Expertise

  • Advanced Materials Science

Dies zitieren

Scale-fragment accumulations blocking geothermal energy extraction - Interacting steel sulfide corrosion and calcite crystallization. / Boch, Ronny; Dietzel, Martin; Haslinger, Edith; Goldbrunner, Johann Emmerich; Mittermayr, Florian; Fröschl, Heinz; Hippler, Dorothee; Leis, Albrecht.

2017. Postersitzung präsentiert bei Goldschmidt Conference, Paris, Frankreich.

Publikation: KonferenzbeitragPosterForschungBegutachtung

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title = "Scale-fragment accumulations blocking geothermal energy extraction - Interacting steel sulfide corrosion and calcite crystallization",
abstract = "Various minerals precipitating from deep saline thermalwater (scaling) often constitute a major obstacle duringgeothermal energy production. The formation of scalefragmentsin pipes, which accumulate and block pumps,filters and heat exchangers, is of particular concern in powerplants hindering an efficient energy extraction. Carbonatescale-fragments from different sections of two geothermalfacilities in S-Germany were studied in a high-resolutionscaling forensic approach including microstructuralcharacterization, elemental mapping and stable isotopeprofiles. The obtained (isotope)geochemical data wereevaluated in the context of favorable vs. unfavorable naturalenvironmental and operational (man-made) productionconditions. Our results support a close relationship of metalsulfide mineral layers forming from H2S corrosion of the steelpipes and CaCO3 nucleation and rapid crystal growth. Aconceptual model of scale-fragment evolution is developedconsidering two key interfaces: i) the corrosion layer betweensteel and calcite scale; ii) the scale surface vs. thermal fluidflow. The corrosion products with brittle and mechanicallyweak consistency constitute an attractive substrate forcarbonate crystallization. The rough carbonate scale surfacepromotes the occurrence of (micro)turbulences and higherflow resistance (frictional forces). These effects can lead topartial exfoliation, fragment mobilization, accumulation andsevere blocking.",
author = "Ronny Boch and Martin Dietzel and Edith Haslinger and Goldbrunner, {Johann Emmerich} and Florian Mittermayr and Heinz Fr{\"o}schl and Dorothee Hippler and Albrecht Leis",
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day = "14",
language = "English",
note = "Goldschmidt Conference ; Conference date: 13-08-2017 Through 18-08-2017",

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TY - CONF

T1 - Scale-fragment accumulations blocking geothermal energy extraction - Interacting steel sulfide corrosion and calcite crystallization

AU - Boch, Ronny

AU - Dietzel, Martin

AU - Haslinger, Edith

AU - Goldbrunner, Johann Emmerich

AU - Mittermayr, Florian

AU - Fröschl, Heinz

AU - Hippler, Dorothee

AU - Leis, Albrecht

PY - 2017/8/14

Y1 - 2017/8/14

N2 - Various minerals precipitating from deep saline thermalwater (scaling) often constitute a major obstacle duringgeothermal energy production. The formation of scalefragmentsin pipes, which accumulate and block pumps,filters and heat exchangers, is of particular concern in powerplants hindering an efficient energy extraction. Carbonatescale-fragments from different sections of two geothermalfacilities in S-Germany were studied in a high-resolutionscaling forensic approach including microstructuralcharacterization, elemental mapping and stable isotopeprofiles. The obtained (isotope)geochemical data wereevaluated in the context of favorable vs. unfavorable naturalenvironmental and operational (man-made) productionconditions. Our results support a close relationship of metalsulfide mineral layers forming from H2S corrosion of the steelpipes and CaCO3 nucleation and rapid crystal growth. Aconceptual model of scale-fragment evolution is developedconsidering two key interfaces: i) the corrosion layer betweensteel and calcite scale; ii) the scale surface vs. thermal fluidflow. The corrosion products with brittle and mechanicallyweak consistency constitute an attractive substrate forcarbonate crystallization. The rough carbonate scale surfacepromotes the occurrence of (micro)turbulences and higherflow resistance (frictional forces). These effects can lead topartial exfoliation, fragment mobilization, accumulation andsevere blocking.

AB - Various minerals precipitating from deep saline thermalwater (scaling) often constitute a major obstacle duringgeothermal energy production. The formation of scalefragmentsin pipes, which accumulate and block pumps,filters and heat exchangers, is of particular concern in powerplants hindering an efficient energy extraction. Carbonatescale-fragments from different sections of two geothermalfacilities in S-Germany were studied in a high-resolutionscaling forensic approach including microstructuralcharacterization, elemental mapping and stable isotopeprofiles. The obtained (isotope)geochemical data wereevaluated in the context of favorable vs. unfavorable naturalenvironmental and operational (man-made) productionconditions. Our results support a close relationship of metalsulfide mineral layers forming from H2S corrosion of the steelpipes and CaCO3 nucleation and rapid crystal growth. Aconceptual model of scale-fragment evolution is developedconsidering two key interfaces: i) the corrosion layer betweensteel and calcite scale; ii) the scale surface vs. thermal fluidflow. The corrosion products with brittle and mechanicallyweak consistency constitute an attractive substrate forcarbonate crystallization. The rough carbonate scale surfacepromotes the occurrence of (micro)turbulences and higherflow resistance (frictional forces). These effects can lead topartial exfoliation, fragment mobilization, accumulation andsevere blocking.

M3 - Poster

ER -