研究論文

Direct air capture (DAC) has emerged as a pivotal negative emission technology for mitigating climate change. A
DAC system integrated with renewable electricity can maximize its carbon capture efficiency; however, the
existing DAC systems are incompatible with the intermittency and fluctuations of renewable electricity. This
study develops an optimal model aiming to enable flexible operation of the DAC, thereby enhancing the utilization of wind electricity. Transferable and curtailable loads are applied to develop a new operational paradigm
for adsorption-DAC systems. A linear programming optimization model is developed to enhance the adaptability
of the DAC, ensuring complete utilization of curtailed electricity from wind farms. The case analysis pinpoints the
requisite DAC deployment capacity, enabling the nullification of wind electricity curtailment within an actual
power profile. Deploying DAC facilities with an annual CO2 capture capacity of 43,500 tons is likely to eliminate
the electricity curtailment of a wind farm of 400 MW in the optimal scenario. Techno-economic analysis indicates
that deploying DAC facilities with an annual CO2 capture of nearly 30,000 tons, along with an impressive 68 %
curtailed electricity utilization rate, is the optimal financial choice for the wind farm. This study confirms that the
feasibility of flexible DAC operation is essential for coupling with renewable electricity.