Water condensation in carbon-dioxide-based engineered geothermal power generation

Atrens, Aleks D., Gurgenci, Hal and Rudolph, Victor (2014) Water condensation in carbon-dioxide-based engineered geothermal power generation. Geothermics, 51 397-405. doi:10.1016/j.geothermics.2014.03.008

Author Atrens, Aleks D.
Gurgenci, Hal
Rudolph, Victor
Title Water condensation in carbon-dioxide-based engineered geothermal power generation
Journal name Geothermics   Check publisher's open access policy
ISSN 0375-6505
Publication date 2014-07-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.geothermics.2014.03.008
Volume 51
Start page 397
End page 405
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
Engineered geothermal systems (EGS) may utilise carbon dioxide as a heat extraction fluid instead of water. Nevertheless, water present in the geothermal reservoir will be extracted into the working fluid, affecting fluid flow behaviour and the required surface plant design for such a system. Dissolved water in a carbon dioxide-rich phase changes thermodynamic properties, and causes corrosion, and erosion where water droplets condense. The conditions for condensation of water in such a system have not been examined. We present condensation curves that predict conditions for water condensation, and bubble curves that predict carbonic acid concentration in a condensed H2O-rich phase. These diagrams predict concentration thresholds for condensation in the production wellbore and surface equipment. Predicted concentration thresholds for condensation do not change significantly in response to change in water content. The probable minimum CO2 concentration allowable for direct use of carbon dioxide as a working fluid is 95% for the turbine.
Keyword Carbon dioxide
Engineered geothermal systems
Phase diagram
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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Created: Tue, 15 Apr 2014, 11:19:47 EST by System User on behalf of School of Mechanical and Mining Engineering