Theoretical and experimental perspectives in utilizing nanobubbles as inhibitors of corrosion and scale in geothermal power plant

Kioka, Arata; Nakagawa, Masami

doi:10.1016/j.rser.2021.111373

Cited by 27 publications

(6 citation statements)

References 166 publications

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“…In contrast, nanobubbles, [143] which were recently reported to be an eco-friendly alternative to mitigate corrosion and scale formation, even at high temperatures, do not seem to be a reliable long-term solution. Indeed, although their addition induced a decrease in the corrosion rate in a Japanese geothermal plant, it might be difficult to generate such nanobubbles for several months on-site, and an inappropriate air injection may be disastrous.…”

Section: Lifetime Of Inhibitor Species Influenced By Product Physical...mentioning

confidence: 96%

Monitoring and mitigating corrosion in geothermal systems

Schott

Liautaud

2022

Materials & Corrosion

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In terms of current needs for renewable resources, geothermal energy is one of the future solutions for heat and electricity generation. However, geothermal plants are exposed to very aggressive media (high-temperature [HT], salt-rich fluid, etc.), leading to extensive corrosion of the metallic parts. Should the corrosion inhibitors work at HT, their injection would be mandatory to ensure the reasonable lifetime of geothermal plants. The first part of this review concerns the degradations observed in geothermal plants, which depend on the site properties and the methods for evaluating the corrosion intensity of such systems. Autoclave experiments, although rarely used for geothermal applications, maybe the most appropriate to measure the representative corrosion rate, that is, under use temperature and pressure conditions. In the second part, clues to evaluate the performance and mechanism of corrosion inhibitors are mentioned, and molecules already used to protect steel are reported. However, this review also highlights the lack of data on HT inhibitors, especially for geothermal applications, where the efficiency of a given molecule is strongly related to the real medium. Thus, the protection of new geothermal plants where HT is reached requires the search for products that are stable and efficient under such conditions.Using the heat derived from the Earth's core, geothermal energy constitutes a renewable solution for future energy. It is already widely used worldwide, especially in Europe with several sites in Iceland and in the Dogger aquifer, Paris basin. Additional sites were recently identified, for example, in Upper Rhine Graben, where the composition of the media and use temperatures may differ from the already established plants.However, due to the aggressiveness of geothermal fluids, one major issue is the reduced lifetime of geothermal plants. Indeed, the steel tubes of such | © 2022 Wiley-VCH GmbH.

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Section: Lifetime Of Inhibitor Species Influenced By Product Physical...mentioning

confidence: 96%

Monitoring and mitigating corrosion in geothermal systems

Schott

Liautaud

2022

Materials & Corrosion

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“…This is attributed to high surface shear forces due to flow turbulence and electrostatic attractions between the negatively charged ultrafine bubbles and the counterions. The potential use of ultrafine bubbles as corrosion and scale inhibitors for geothermal power plants was discussed (Kioka and Nakagawa, 2021). The crystal growth rate of calcite, which causes scaling, was found to be more retarded as the concentration of ultrafine bubbles increased (Tagomori et al, 2022).…”

Section: Cleaning and Prevention Of Foulingmentioning

confidence: 99%

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology

Yasuda

2024

KONA

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Ultrafine bubbles (bulk nanobubbles), small bubbles less than 1 µm in diameter, have attracted academic and industrial attention because of their numerous advantages, including their chemical-free nature and extraordinarily long lifetime. The long lifetime is related to the much higher Brownian motion velocity than buoyancy. The reason why ultrafine bubbles can endure under stable conditions is still unclear, even though their inside is highly pressured. They have several characteristics, such as pH-dependent surface charge and reduction in friction. They are also closely related to ultrasound. Ultrafine bubbles are generated and removed by selecting the ultrasonic frequency. Reaction and separation using ultrasonic cavitation and atomization, respectively, are enhanced by ultrafine bubbles. They can produce hollow nanoparticles, enhance adsorption on activated carbon, and clean solid surfaces. This review discusses the fundamental and ultrasonic characteristics of ultrafine bubbles and their application to particle-related technology: fine particle synthesis, adsorption, desorption, extraction, cleaning, and prevention of fouling.

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“…5 To solve these scaling issues, various methods such as coagulation desilication, 6 acidification, 7 and scale inhibitor addition in circulating water have been employed. 8,9 However, coagulation desilication is costly, and acidification can lead to corrosion. Scale inhibitor addition is favored for its stability and simplicity, and is widely used in geothermal systems.…”

Section: Introductionmentioning

confidence: 99%

“…The silica scale and silicate scale appear simultaneously in high‐temperature regions (≥120°C) 5 . To solve these scaling issues, various methods such as coagulation desilication, 6 acidification, 7 and scale inhibitor addition in circulating water have been employed 8,9 . However, coagulation desilication is costly, and acidification can lead to corrosion.…”

Section: Introductionmentioning

confidence: 99%

An efficient silica scale inhibiting strategy for geothermal systems: Combination of cationic and anionic polymers

Chen

Peng

et al. 2023

J of Applied Polymer Sci

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Cationic silica scale inhibitors are widely used, but are prone to precipitation and exhibit poor performance in geothermal systems. In this study, the cationic polymer polyethyleneimine ethoxylate (PEIE) was first found to have high silica scale inhibition efficiency. Three anionic polymers were added separately to PEIE solutions to alleviate the precipitation and scaling. The inhibition effect of PEIE alone and PEIE with anionic polymers were measured at 40 C without salt and 136.7 C with salt. Molecular dynamics simulation was used to investigate the inhibition mechanism. The results showed that PEIE exhibited good inhibition efficiency of 62% at 40 C without salt and 48% at 136.7 C with salt, while the addition of the anionic polymer acrylic acid-2-acrylamide-2-methylpropanesulfonic acid (AA/AMPS) to PEIE further improved to 71% and 62%. Compared with commercial inhibitors, the PEIE + AA/AMPS enhanced at least 15% scale inhibition efficiency. This is because the addition of AA/AMPS: (1) enhances the attraction of PEIE to silicic acid and inhibits the silicic acid condensation process; (2) chelates metal ions that promote condensation; and (3) enhances dispersion ability, stabilizing the colloid formed by PEIE and silicic acid. This study provides a promising new inhibitor and efficient strategy for inhibiting silica scale in geothermal systems.

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Theoretical and experimental perspectives in utilizing nanobubbles as inhibitors of corrosion and scale in geothermal power plant

Cited by 27 publications

References 166 publications

Monitoring and mitigating corrosion in geothermal systems

Monitoring and mitigating corrosion in geothermal systems

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology

An efficient silica scale inhibiting strategy for geothermal systems: Combination of cationic and anionic polymers

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