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<p>This study proposes a new cogeneration system integrated steam injection gas turbine system (STIG) with compressed air and thermal energy storage (CAES and TES). In the new system, the problem of power consumed by air compressor in conventional STIG is solved by utilizing surplus electricity. At the same time, the stored compression heat in charging process is utilized to preheat released air in the discharging process. Additionally, the output power is increased without installing additional power generation systems in comparison to gas turbine-steam turbine combined cycle due to steam injection into combustor. The coupled system is simulated in Aspen plus software. The energy analysis, exergy analysis and sensitivity analysis are carried out to evaluate the system performance. The results indicated that round-trip thermal efficiency, electricity efficiency, exergy efficiency and discharging efficiency can reach 63.60%, 54.93%, 54.03% and 74.16%, respectively. The electricity efficiency of new system has an improvement of 6.29% compared to traditional STIG system. The sensitivity analysis revealed that steam injection ratio and air tank outlet pressure are the main influencing parameters for system energy efficiencies. There always exist peak round-trip efficiencies with optimum steam injection ratio of 0.19. Besides, increasing air tank outlet pressure can improve system efficiencies. In summary, the new STIG hybrid system provides theoretical direction for the application of high efficiency thermodynamic system.</p>

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Thermodynamic Performance Study on a Novel Steam Injection Gas Turbine Cycle Combined with Compressed Air and Thermal Energy Storage

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Zhenlan Dou,
  • Hongyin Chen,
  • Chaoran Fu,
  • Chunyan Zhang,
  • Songcen Wang,
  • Jianfeng Li,
  • Xiang Zhou,
  • Dezhi Li

摘要

This study proposes a new cogeneration system integrated steam injection gas turbine system (STIG) with compressed air and thermal energy storage (CAES and TES). In the new system, the problem of power consumed by air compressor in conventional STIG is solved by utilizing surplus electricity. At the same time, the stored compression heat in charging process is utilized to preheat released air in the discharging process. Additionally, the output power is increased without installing additional power generation systems in comparison to gas turbine-steam turbine combined cycle due to steam injection into combustor. The coupled system is simulated in Aspen plus software. The energy analysis, exergy analysis and sensitivity analysis are carried out to evaluate the system performance. The results indicated that round-trip thermal efficiency, electricity efficiency, exergy efficiency and discharging efficiency can reach 63.60%, 54.93%, 54.03% and 74.16%, respectively. The electricity efficiency of new system has an improvement of 6.29% compared to traditional STIG system. The sensitivity analysis revealed that steam injection ratio and air tank outlet pressure are the main influencing parameters for system energy efficiencies. There always exist peak round-trip efficiencies with optimum steam injection ratio of 0.19. Besides, increasing air tank outlet pressure can improve system efficiencies. In summary, the new STIG hybrid system provides theoretical direction for the application of high efficiency thermodynamic system.