储能科学与技术 ›› 2025, Vol. 14 ›› Issue (10): 3848-3858.doi: 10.19799/j.cnki.2095-4239.2025.0267

• 储能系统与工程 • 上一篇    下一篇

耦合乙烯工艺余热的气液互转压缩二氧化碳储能系统研究

张晓海1,2(), 孙新雨2, 孟子硕1, 边海阳2, 赵浩岚1, 张文哲2, 楚攀1(), 李明涛2()   

  1. 1.中石油深圳新能源研究院有限公司,广东 深圳 518000
    2.绿色氢电全国重点实验室,西安 交通大学,陕西 西安 710049
  • 收稿日期:2025-03-18 修回日期:2025-05-14 出版日期:2025-10-28 发布日期:2025-10-20
  • 通讯作者: 楚攀,李明涛 E-mail:zxh01@petrochina.com.cn;chupan@petrochina.com.cn;mingtao@mail.xjtu.edu.cn
  • 作者简介:张晓海(1993—),男,博士,助理研究员,研究方向为能源系统工程与储能,E-mail:zxh01@petrochina.com.cn
  • 基金资助:
    国家自然科学基金“能源有序转化”基础科学中心项目(51888103);中石油深圳新能源研究院有限公司科研项目(SZ2024ZT002)

Gas-liquid-interconversion compressed carbon dioxide energy storage driven by waste heat from the ethylene process for industrial steam production

Xiaohai ZHANG1,2(), Xinyu SUN2, Zishuo MENG1, Haiyang BIAN2, Haolan ZHAO1, Wenzhe ZHANG2, Pan CHU1(), Mingtao LI2()   

  1. 1.PetroChina Shenzhen New Energy Research Institute, Shenzhen 518000, Guangdong, China
    2.National Key Laboratory of Green Hydrogen and Electricity, Xi 'an Jiaotong University, Xi 'an 710049, Shaanxi, China
  • Received:2025-03-18 Revised:2025-05-14 Online:2025-10-28 Published:2025-10-20
  • Contact: Pan CHU, Mingtao LI E-mail:zxh01@petrochina.com.cn;chupan@petrochina.com.cn;mingtao@mail.xjtu.edu.cn

摘要:

压缩二氧化碳储能作为新型长时储能的代表方向,是平抑可再生电力高波动问题的有效手段。针对当前绝热压缩二氧化碳储能系统的热量来源和利用范围受限所导致的技术经济性瓶颈问题,本研究提出了一种耦合乙烯工艺余热的气液互转压缩二氧化碳储能系统。该系统将乙烯工艺的低品位余热用于释能段液态二氧化碳的气化吸热,同时将储能段的部分高品位回收热用于生产工业蒸汽,从而提高热能利用效率,增强储能系统效益。通过对比不同工况下的系统性能和经济敏感性分析,发现当回收热主要用于产生工业蒸汽时,系统发电能力和储能密度较低,但得益于蒸汽输出收益,系统循环收益提升明显;当回收热主要用于供给释能段发电时,系统电-电循环效率显著提高,但系统收益受电价差影响较大,适用于高电价差地区。

关键词: 压缩二氧化碳储能, 乙烯工艺余热, 热力学分析, 经济性分析

Abstract:

Compressed carbon dioxide (CO2) energy storage, as a representative direction for novel long-term energy storage, is an effective strategy for smoothing the high volatility of renewable electricity. To resolve the limited heat sources and application potential of existing adiabatic compressed CO2 energy storage systems (ESSs), which result in decreased economic gains, a gas-liquid-interconversion compressed CO2 ESS, which is driven by waste heat from the ethylene process, is proposed. This system utilizes low-grade waste heat from the ethylene process for the gasification of liquid CO2 and the absorption of heat from the gasified CO2 in its energy-release section. Additionally, it uses a proportion of the high-grade recovered heat from its energy-storage section to produce industrial steam, thereby enhancing heat utilization and the benefits of the ESS. Performance and economic sensitivity analysis under different operating conditions reveal that its power-generation capacity and energy-storage density decrease when most of the recovered heat is mainly used to generate industrial steam. However, the overall system cycle gain is significantly enhanced by steam-output profits. Additionally, when the compressed heat is mainly used to supply power to the energy-release section of the system, its power-cycle efficiency improves significantly, although the system gain is significantly impacted by the electricity-price difference, favoring regions with high electricity-price variability.

Key words: compressed carbon dioxide energy storage, ethylene-process waste heat, thermodynamic analysis, economic analysis

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