Planned Experimental Studies into the Nucleation and Precipitation Kinetics of Sulfate-bearing Minerals under Conditions Relevant to CO₂ Geological Storage

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• 作者：Pedro M. Rendel ; Domenik Wolff-Boenish ; Ittai Gavrielli ; Jiwchar Ganor
• 关键词：CCS ; CO2 ; water-rock interaction ; Kinetics ; Super-critical ; Dissolution ; Precipitation.
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：5494-5500
• 全文大小：262 K

文摘

Carbon Capture and Storage (CCS) has been widely recognized as one of the main technologies to mitigate climate change. Deep-saline aquifers are among the preferred potential repositories for CO₂ currently being emitted to the atmosphere from burning of fossil fuels. Large-scale injection of supercritical CO₂ into subsurface reservoirs induces a complex interplay of multiphase flow, capillary trapping, dissolution and chemical reactions that may have significant impacts on both, short-term injection performance and long-term fate of CO₂ storage. To ensure the viability of geological CO₂ storage, a holistic understanding of reactions at supercritical CO2-water-rock interfaces and the environmental factors affecting these interactions is required.

The major objectives of this contribution are to study the kinetics of CO₂ brine-rock interactions and derive respective chemical reaction rate expressions under the typical conditions of CO₂ storage sites. These rate laws may be used in modeling the storage sites and operating them in a way that will minimize scaling and thus potential reduction of injectivity.

A new experimental system was set up at the Water-Rock interaction laboratory, Ben-Gurion University of the Negev that allows studying the interaction between CO₂, brine, and minerals under CO₂ supercritical conditions. All equipment is fully capable to deal with adjustable PTX conditions enabling continuous and computerized data acquisition of various variables including pressure, temperature, stirring speed, in-situ measurement of pH and redox potential. The experimental setup allows the measurement of dissolution and precipitation rates of diverse minerals under a wide range of environmental conditions as found in CO₂ storage sites offering the possibility to collect liquid and solid samples for further chemical and morphological analyses.