光伏耦合驱动分布式直接空气捕集CO2经济性分析OA

Objective This study aims to address the intermittency and high energy consumption challenges of direct air capture(DAC)of CO2 for low-concentration sources.Method Four continuous DAC systems with different photovoltaic(PV)-coupled power supply configurations were developed for distributed carbon capture in the oil and gas industry,taking a PV project in the Qaidam Basin as a case study.Economic indicators,including levelized cost of electricity(LCOE)and levelized cost of DAC(LCOD),were calculated.An in-depth sensitivity analysis was then conducted to assess the impact of key factors,such as annual solar irradiance,PV capacity,sorbent cost,and capture energy intensity,on system performance.Result First,compared to PV-battery,PV-thermal,and PV-grid systems,the PV system coupled with both thermal and battery energy storage(PV-TES-BESS)achieves an LCOD of 265 USD/t.Although slightly higher than that of the PV-grid system,it provides 100%renewable power supply and lifecycle carbon negativity,representing a more competitive solution.Second,assuming an annual 5%improvement in PV technology over the next decade,the LCOD is expected to decrease by approximately half,and system scale-up will significantly reduce unit costs.Third,the LCOD exhibits linear sensitivity to capture energy intensity,ranging from 265 to 946 USD/t,as the energy intensity increases from 1 400 to 5 000 kW·h/t.Conclusion These findings demonstrate the significant economic potential of off-grid PV-coupled driven continuous DAC systems through reductions in energy intensity and technological advancements,providing a distributed green-power-based carbon capture solution for the low-carbon transition of oil and gas fields.