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Calculation of CO2 solubility in thermal waters in the context of geothermal utilization

Goldberg, Valentin; Held, Sebastian; Nitschke, Fabian; Siefert, Dorothee; Kölbel, Thomas; Kohl, Thomas

Abstract (englisch):

High contents of CO2 in geothermal brines can lead to several ecological and economical challenges in geothermal heat and electricity production. The degassing of CO2 can cause damages at the surface power station leading to higher maintenance costs. Furthermore, if there is no reinjection strategy for the produced CO2, the produced energy cannot be seen as emission free and sustainable. The knowledge of the CO2 contents and their right handling are therefore of utmost importance.
This study focusses on the different approaches of calculating the handling of CO2 in geothermal brines and therefore the calculation of its solubility under different circumstances. Since the publication of the van der Waals equation in 1873 the modeling of the behavior of real gases has led to a development of several equations of state like the approaches of Pitzer, 1955 or Peng & Robinson, 1976. Until today these approaches are further developed and expanded.
The knowledge about the possible solubility of CO2 allows to predict the so-called bubble point, the temperature and pressure conditions where the CO2 starts to shift into the vapor phase. The prediction of the bubble point of the CO2 makes it possible to calculate the required pressure to keep the CO2 in solution respectively to inject it back into the reservoir. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsmonat/-jahr 11.2018
Sprache Englisch
Identifikator KITopen-ID: 1000105732
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung Student Technical Conference (STC 2018), Freiberg, Deutschland, 08.11.2018 – 09.11.2018
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