Integration of dry-sorbent CO2 capture process with natural gas combined cycle: Economic and environmental analyses

초록

Compared to conventional fossil fuel power plants, natural gas combined cycle (NGCC) systems produce less CO2 and offer higher efficiency, making them a promising transitional technology for power generation. Nevertheless, CO2 emissions from NGCC still contribute to environmental degradation, necessitating the integration of CO2 capture technologies. Dry-sorbent CO2 capture, in particular, offers advantages such as compact plant design, reduced corrosion, and lower energy consumption. However, its economic and environmental performance has not been extensively investigated. In this study, two dry-sorbent CO2 capture processes were developed, employing vacuum swing adsorption (VSA) and temperature swing adsorption (TSA), respectively. The levelized costs of CO2 capture were determined to be 76.4 USD per ton and 73.3 USD per ton for VSA and TSA, respectively. Furthermore, global warming potential was reduced by 45% and 49% for VSA and TSA, respectively, corresponding to annual reductions of 827 & times; 103 and 908 & times; 103 tons of CO2 eq. These results indicate that TSA is the more economically and environmentally advantageous option. The electricity consumption of blowers, driven by pressure drop, was identified as a major factor influencing both economic and sustainability outcomes. The insights from this study may serve as guidelines for the commercialization and optimization of the drysorbent CO2 capture process.

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