Paving the way for CO2-Plume Geothermal (CPG) systems: A perspective on the CO2 surface equipment
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Date
2024-10-01
Publication Type
Journal Article
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Abstract
Subsurface reservoirs play an important role in decarbonizing the energy sector, be it through geothermal energy production or carbon capture and storage. In recent years, there has been an increasing interest in CO₂-Plume Geothermal systems, which combine carbon sequestration with geothermal, using CO₂ instead of water as a subsurface heat and pressure energy carrier. Since CO₂-Plume Geothermal systems are added to full-scale CO₂ Capture and Sequestration operations, all of the initially injected CO₂ is ultimately stored. CO₂-Plume Geothermal, therefore constitutes of both CO₂ Capture Utilization as well as Storage. This paper assesses the huge technical potential of this technology, identifying a potentially highly relevant market for CO₂ equipment manufacturers and discusses the current research demand, based on the current state of the art of CO₂ equipment. Both temperature and pressure levels are significantly lower than CO₂ turbine designs investigated and proposed so far for other applications, such as waste heat recovery. For a depth of 5 km, a typical one-stage radial turbine design might have a rotational speed of 23’000 rpm to 42’000 rpm and an impeller diameter between 96 mm to 155 mm. Together with technology-specific requirements, due to produced fluid impurities, it becomes evident that significant further development efforts are still necessary.
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published
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Journal / series
Volume
305
Pages / Article No.
132258
Publisher
Elsevier
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Subject
Geothermal energy; CO2 -plume geothermal; CCUS; CO2 turbine; CO2 compressor
Organisational unit
09494 - Saar, Martin O. / Saar, Martin O.
09494 - Saar, Martin O. / Saar, Martin O.