Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4719

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2015 - 20192

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Author: search.filters.author.Koç, Gonca A.

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  • Article
    Citation - WoS: 13
    Citation - Scopus: 16
    The Injection of Co2 To Hypersaline Geothermal Brine: a Case Study for Tuzla Region
    (Elsevier Ltd., 2019) Topçu, Gökhan; Koç, Gonca A.; Baba, Alper; Demir, Mustafa Muammer
    Scaling is a serious issue for geothermal power plants since it remarkably decreases the harvesting of energy. The reduction of pH by organic acids whose structure is close to CO2 for instance formic acid has been an effective solution for the minimization of scaling. Herein, the effect of CO2 injection on the formation of scaling particularly metal-silicates was investigated for the model case of Tuzla Geothermal Field (TGF) located in the northwest of Turkey. CO2 has an acidic character in aqueous systems because it leads to the formation of carbonic acid. The injection of 20.6 m3/s CO2 (approximately 88 ppm) to hypersaline brine of TGF is a promising green approach for both mitigation of scaling by reducing pH from 7.2 to 6.2 at the well-head and the minimization of potential corrosion compared to the use of formic acid (55 ppm).
  • Article
    Citation - WoS: 30
    Citation - Scopus: 36
    Hydrogeological Properties of Hyper-Saline Geothermal Brine and Application of Inhibiting Siliceous Scale Via Ph Modification
    (Elsevier Ltd., 2015) Baba, Alper; Demir, Mustafa Muammer; Koç, Gonca A.; Tuğcu, Celal
    Scaling is a major obstacle in harnessing of geothermal energy from the geothermal resources. This paper presents a case study for inhibition of metal silicate scaling using formic acid, harvesting more energy in particular case of Tuzla Geothermal Field (TGF), located on Biga Peninsula, in the northwestern of Turkey. TGF is 5. km far from Aegean Sea and 80. km south of Çanakkale. Geothermal fluid of TGF has high salinity (EC. > 91. mS/cm) and medium temperature (reservoir temperature is 173. °C). The acidification of high-salinity brine to mitigate silicate scaling is examined. Results of the study showed that a compromise between scaling and corrosion is achieved by reducing pH of brine to <6 using 55. ppm formic acid.