Evaluation of Geothermal Scaling Possibilities and the Effective Scale Mitigation Methods at Different Type Geothermal Power Plants in Western Anatolia (Turkey)
Fusun S. TUT HAKLIDIR, Tugbanur OZEN BALABAN, Raziye SENGUN
[Istanbul Bilgi University, Turkey]
Flash and ORC-binary type geothermal power plants are widely used for power generation at moderate or moderate-high reservoir temperatures at water-dominated reservoirs. For the effective management of these power cycles, it is critical to understand the effects of controlling pressure at different sections of a power plant as well as temperature changes and the pH levels of geothermal fluids. The expectation of energy efficiency at a advanced geothermal power plant is higher than for flash and binary systems, while the management of these systems are more complex because of high reservoir temperatures and multi-separation processes. Western Anatolia has important high-medium geothermal systems that are suitable for power production, depending on the large graben systems. Geothermal power plants (Turkey) are generally designed as binary and flash types, based on the reservoir temperatures (in Germencik-Aydın, Kızıldere-Denizli, Alaşehir-Manisa regions etc.) in Western Anatolia. The scale types may change with respect to geothermal fields even if they are in close proximity to each other. At the same time, in addition to specific scale types, some minerals are commonly found across each of the geothermal fields. The most important scale types in production wells and lines as well as surface equipment are carbonate minerals such as calcite and aragonite. In addition, silica minerals also tend to precipitate at re-injection lines. Scale types in re-injection lines and wells have been commonly identified as celestine, strontium and barite minerals mixed with silica and carbonates at some of geothermal power plants. Scale prevention inhibitors and inhibitor systems with different chemical properties are generally used for anti-scaling. Another method is to use control coupons for scale precipitation to realize pressure drop points along pipelines. Controlling re-injection temperatures and pH levels have had success for anti-scaling. This study is mainly focused on mineral precipitation conditions and the effective scale inhibition applications at different type geothermal power plants in Western Anatolia (Turkey).
|        Topic: Corrosion and Scaling||Paper Number: 27008|