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Deep Low-Carbon Economic Optimization Using CCUS and Two-Stage P2G with Multiple Hydrogen Utilizations for an Integrated Energy System with a High Penetration Level of Renewables

Author

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  • Junqiu Fan

    (The Electrical Engineering College, Guizhou University, Guiyang 550025, China
    Guizhou Power Grid Co., Ltd., Guiyang 550002, China)

  • Jing Zhang

    (The Electrical Engineering College, Guizhou University, Guiyang 550025, China)

  • Long Yuan

    (Guizhou Power Grid Co., Ltd., Guiyang 550002, China)

  • Rujing Yan

    (The Electrical Engineering College, Guizhou University, Guiyang 550025, China)

  • Yu He

    (The Electrical Engineering College, Guizhou University, Guiyang 550025, China)

  • Weixing Zhao

    (Guizhou Power Grid Co., Ltd., Guiyang 550002, China)

  • Nang Nin

    (Guizhou Power Grid Co., Ltd., Guiyang 550002, China)

Abstract

Integrating carbon capture and storage (CCS) technology into an integrated energy system (IES) can reduce its carbon emissions and enhance its low-carbon performance. However, the full CCS of flue gas displays a strong coupling between lean and rich liquor as carbon dioxide liquid absorbents. Its integration into IESs with a high penetration level of renewables results in insufficient flexibility and renewable curtailment. In addition, integrating split-flow CCS of flue gas facilitates a short capture time, giving priority to renewable energy. To address these limitations, this paper develops a carbon capture, utilization, and storage (CCUS) method, into which storage tanks for lean and rich liquor and a two-stage power-to-gas (P2G) system with multiple utilizations of hydrogen including a fuel cell and a hydrogen-blended CHP unit are introduced. The CCUS is integrated into an IES to build an electricity–heat–hydrogen–gas IES. Accordingly, a deep low-carbon economic optimization strategy for this IES, which considers stepwise carbon trading, coal consumption, renewable curtailment penalties, and gas purchasing costs, is proposed. The effects of CCUS, the two-stage P2G system, and stepwise carbon trading on the performance of this IES are analyzed through a case-comparative analysis. The results show that the proposed method allows for a significant reduction in both carbon emissions and total operational costs. It outperforms the IES without CCUS with an 8.8% cost reduction and a 70.11% reduction in carbon emissions. Compared to the IES integrating full CCS, the proposed method yields reductions of 6.5% in costs and 24.7% in emissions. Furthermore, the addition of a two-stage P2G system with multiple utilizations of hydrogen further amplifies these benefits, cutting costs by 13.97% and emissions by 12.32%. In addition, integrating CCUS into IESs enables the full consumption of renewables and expands hydrogen utilization, and the renewable consumption proportion in IESs can reach 69.23%.

Suggested Citation

  • Junqiu Fan & Jing Zhang & Long Yuan & Rujing Yan & Yu He & Weixing Zhao & Nang Nin, 2024. "Deep Low-Carbon Economic Optimization Using CCUS and Two-Stage P2G with Multiple Hydrogen Utilizations for an Integrated Energy System with a High Penetration Level of Renewables," Sustainability, MDPI, vol. 16(13), pages 1-20, July.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:13:p:5722-:d:1428954
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