A Simulation Study on Evaluating the Influence of Impurities on Hydrogen Production in Geological Carbon Dioxide Storage

Seungmo Ko, Sung-Min Kim and Hochang Jang ()
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Seungmo Ko: Department of Energy and Mineral Resources Engineering, Kangwon National University, Samcheok 25913, Republic of Korea
Sung-Min Kim: Department of Energy Resources and Chemical Engineering, Kangwon National University, Samcheok 25913, Republic of Korea
Hochang Jang: Department of Energy Resources and Chemical Engineering, Kangwon National University, Samcheok 25913, Republic of Korea

Sustainability, 2023, vol. 15, issue 18, 1-19

Abstract: In this study, we examined the effect of CO 2 injection into deep saline aquifers, considering impurities present in blue hydrogen production. A fluid model was designed for reservoir conditions with impurity concentrations of 3.5 and 20%. The results showed that methane caused density decreases of 95.16 and 76.16% at 3.5 and 20%, respectively, whereas H 2 S caused decreases of 99.56 and 98.77%, respectively. Viscosity decreased from 0.045 to 0.037 cp with increasing methane content up to 20%; however, H 2 S did not affect the viscosity. Notably, CO 2 with H 2 S impacted these properties less than methane. Our simulation model was based on the Gorae-V properties and simulated injections for 10 years, followed by 100 years of monitoring. Compared with the pure CO 2 injection, methane reached its maximum pressure after eight years and eleven months at 3.5% and eight years at 20%, whereas H 2 S reached maximum pressure after nine years and two months and nine years and six months, respectively. These timings affected the amount of CO 2 injected. With methane as an impurity, injection efficiency decreased up to 73.16%, whereas with H 2 S, it decreased up to 81.99% with increasing impurity concentration. The efficiency of CO 2 storage in the dissolution and residual traps was analyzed to examine the impact of impurities. The residual trap efficiency consistently decreased with methane but increased with H 2 S. At 20% concentration, the methane trap exhibited higher efficiency at the end of injection; however, H 2 S had a higher efficiency at the monitoring endpoint. In carbon capture and storage projects, methane impurities require removal, whereas H 2 S may not necessitate desulfurization due to its minimal impact on CO 2 storage efficiency. Thus, the application of carbon capture and storage (CCS) to CO 2 emissions containing H 2 S as an impurity may enable economically viable operations by reducing additional costs.

Keywords: carbon capture and storage; impurities; hydrogen production; saline aquifer (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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