In a recent study published in the journal Geothermics, researchers from the Istanbul Technical University and the Leibniz University of Hannover, led by Serhat Tonkul, have investigated the challenges posed by mineral scaling in geothermal power plants, specifically focusing on the Germencik Geothermal Field (GGF) in Turkey’s Western Anatolia region.
The team, which includes Alper Baba, Mustafa M. Demir, and Simona Regenspurg, examined the formation of stibnite scaling in the preheater system of the GGF. Stibnite is a mineral composed of antimony sulfide, and its deposition can significantly reduce the efficiency of geothermal power plants by clogging pipes and other equipment. The researchers found that the geothermal waters in the GGF primarily consist of sodium-chloride-bicarbonate types, which contribute to the formation of stibnite scaling.
The study highlights that the scaling issue is particularly prevalent in the Büyük Menderes Graben (BMG), an area with complex geology and high geothermal potential. The tectonic activity in this region, while posing seismic risks, also provides substantial geothermal resources. The researchers determined that the optimum reinjection temperature to prevent stibnite scaling in the GGF is 95 degrees Celsius. This finding is crucial for maintaining the efficiency and longevity of geothermal power plants in the region.
For the energy sector, this research underscores the importance of understanding and mitigating mineral scaling in geothermal systems. By optimizing reinjection temperatures and implementing appropriate scaling prevention strategies, geothermal power plants can enhance their energy harvesting capabilities and reduce maintenance costs. The study also serves as a case study for other geothermal fields with similar geological and hydrochemical characteristics, providing valuable insights for the global geothermal industry.
The research was published in the journal Geothermics, offering a comprehensive analysis of stibnite scaling and its implications for geothermal energy production. The findings contribute to the ongoing efforts to improve the efficiency and sustainability of geothermal power plants, a critical component of the renewable energy mix.
This article is based on research available at arXiv.