Net-Zero carbon pathway for integrated energy systems: co-optimizing biomass-coupled carbon capture and trans-seasonal thermal storage dispatch

Abstract

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  A near-zero-carbon IES dispatch framework integrate BECCS and mine-water heat storage
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  Coal-biomass co-firing is coupled with CO₂ capture-mineralization
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  Mine-water heat storage recovers waste heat for seasonal heat-load shifting
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  CO₂ mineralization cuts capture energy use by 51.73% and IES cost by 32.41%

To facilitate the low-carbon transition of energy systems and enhance renewable energy accommodation, this paper proposes a near-zero carbon scheduling framework for electricity-gas-heat integrated energy systems, which integrates full-cycle synergistic optimization of carbon source-capture-mineralization processes and trans-seasonal energy storage, addressing the dual challenges of high carbon emissions from coal-fired units and renewable energy curtailment caused by seasonal supply-demand imbalances. First, considering the zero-carbon attributes of biomass and carbon capture-mineralization technology, a coal-biomass co-firing system integrated with carbon capture-mineralization processes is established to analyze its electric-carbon coupling dynamics and emission reduction mechanisms. Second, a mine water-based trans-seasonal thermal storage system is introduced to reduce renewable energy curtailment and achieve deep decarbonization through spatiotemporal heat transfer. Finally, a co-optimization dispatch model is developed, incorporating synergistic reserves from biomass-coupled carbon capture plants and hydrogen storage systems. At the same time, energy characteristics under typical days in different seasons are analyzed. Simulation results show that the proposed model reduces system operating cost by 32.41%, decreases carbon capture energy consumption by 51.73%, and increases the unit net output by 7.78%, demonstrating its effectiveness in supporting near-zero-carbon IES operation.

To facilitate the low-carbon transition of energy systems and enhance renewable energy accommodation, this paper proposes a near-zero carbon scheduling framework for electricity-gas-heat integrated energy systems, which integrates full-cycle synergistic optimization of carbon source-capture-mineralization processes and trans-seasonal energy storage, addressing the dual challenges of high carbon emissions from coal-fired units and renewable energy curtailment caused by seasonal supply-demand imbalances. First, considering the zero-carbon attributes of biomass and carbon capture-mineralization technology, a coal-biomass co-firing system integrated with carbon capture-mineralization processes is established to analyze its electric-carbon coupling dynamics and emission reduction mechanisms. Second, a mine water-based trans-seasonal thermal storage system is introduced to reduce renewable energy curtailment and achieve deep decarbonization through spatiotemporal heat transfer. Finally, a co-optimization dispatch model is developed, incorporating synergistic reserves from biomass-coupled carbon capture plants and hydrogen storage systems. At the same time, energy characteristics under typical days in different seasons are analyzed. Simulation results show that the proposed model reduces system operating cost by 32.41%, decreases carbon capture energy consumption by 51.73%, and increases the unit net output by 7.78%, demonstrating its effectiveness in supporting near-zero-carbon IES operation.