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Investigation of Scaling and Materials’ Performance in Simulated Geothermal Brine

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posted on 2025-02-03, 14:51 authored by David Martelo, Briony Holmes, Namrata Kale, Samuel Warren Scott, Shiladitya PaulShiladitya Paul
Geothermal energy generation faces challenges in efficiency, partly due to restrictions on reinjection temperatures caused by scaling issues. Therefore, developing strategies to prevent scaling is critical. This study aims to simulate the scaling tendencies and corrosion effects of geothermal fluids on various construction materials used in scaling reactor/retention tank systems. A range of materials, including carbon steel, austenitic stainless steel, duplex stainless steel, two proprietary two-part epoxy coatings, and thermally sprayed aluminium (TSA), were tested in a simulated geothermal brine. Experiments were conducted in a laboratory vessel designed to replicate the wall shear stress conditions expected in a scaling reactor. The tests revealed varying scaling tendencies among the materials, with minimal corrosion observed. The dominant scale formed was calcium carbonate, consistent with geochemical modelling. The findings suggest that despite the high operating temperatures, the risk of corrosion remains low due to the brine’s low chloride content, while the wettability of materials after immersion may serve as a useful indicator for selecting those that promote scaling.

Funding

The project is funded by European Union’s H2020 research programme under Grant agreement no. 818576

History

Author affiliation

College of Science & Engineering Engineering

Version

  • VoR (Version of Record)

Published in

Materials

Volume

17

Issue

21

Pagination

5250 - 5250

Publisher

MDPI AG

issn

1996-1944

eissn

1996-1944

Copyright date

2024

Available date

2025-02-03

Spatial coverage

Switzerland

Language

en

Deposited by

Dr Shiladitya Paul

Deposit date

2025-01-21

Data Access Statement

The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding authors.

Rights Retention Statement

  • No

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