将直接空气碳捕集(Direct air carbon capture，DAC)与可再生综合能源系统(Integrated energy system，IES)结合，是实现区域碳中和的有效途径。合理的配置方法是系统稳定、灵活、经济与零碳的前提。常规配置方法无法反映DAC吸附、解吸的动态CO2传质特性以及能耗特征差异，导致非最优或不可行的配置方案。为此，本文构建了面向配置的DAC模型以反映其动态运行特性，在此基础上以包含投资成本、运维成本、可再生能源削减惩罚以及负碳排环境效益的年总成本为目标函数，建立DAC-IES配置模型，获得各设备的最佳容量与协同运行策略，揭示间歇波动供能背景下DAC的灵活运行机制。案例分析验证了所提出的配置方法的有效性与优越性。结果同时表明，DAC系统灵活运行能够实现与可再生能源更好地协调与更经济地碳捕集。
Configuration Optimization Approach for Direct Air Carbon Capture-Integrated Energy System
Integrating direct air carbon capture(DAC)with renewable integrated energy systems(IES)provides an effective pathway to regional carbon neutrality.The reasonable configuration approach is a prerequisite for the stable,flexible,economic and zero-carbon operation of the over-all system.Conventional configuration approaches cannot reflect the dynamic CO2 mass transfer characteristics and energy consumption differences of DAC adsorption and desorption,resulting in suboptimal or infeasible configurations.To this end,this paper constructs the configuration-oriented DAC models to reflect its dynamic operation characteristics.Based on this,a DAC-IES configu-ration scheme is established with the annual total costs including investment costs,operation and maintenance costs,renewable curtailment penalties,and negative-carbon environmental benefits as the objective function to obtain the optimal capacity and collaborative operation strategy of each equipment,revealing the flexible operation mechanism of DAC under the background of intermittent fluctuation energy supply.The case study validates the effectiveness and superiority of the proposed configuration method.The analysis also indicates that the flexible operation of DAC systems enables better coordination with renewable energy and more cost-effective carbon capture.
direct air carbon captureintegrated energy systemdynamic characteristicsoptimal configurationflexible operation
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