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Analysis of a direct vapor generation system using cascade steam-organic Rankine cycle and two-tank oil storage

Author

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  • Li, Pengcheng
  • Lin, Haiwei
  • Li, Jing
  • Cao, Qing
  • Wang, Yandong
  • Pei, Gang
  • Jie, Desuan
  • Zhao, Zilong

Abstract

A direct vapor generation solar power system using cascade steam-organic Rankine cycle and two-stage oil tanks is proposed. It offers a significantly enlarged storage capacity due to the unique discharge operation mode. Synthetic oil Therminol® VP-1 is used as the heat carrier and storage medium. Compared with the direct steam generation system, the steam turbine inlet temperature is elevated from 270 °C to 311 °C. Thermodynamic analysis indicates that the optimal equivalent heat-to-power conversion efficiency (ηeq,opt) is 27.91% when benzene is used as the bottom fluid and the mass of oil is 1000 tonnes. ηeq,opt is raised by 7.72–11.60% for the selected four organic fluids as compared with the direct steam generation type. The temperature drop of oil during discharge can reach about 280 °C. Economic studies demonstrate that the proposed system is more cost-effective. Its equivalent payback period is less than 5 years for a 10 MW system with 2000 tonnes of oil. Further investigation shows that it is also more advantageous than a conventional thermal oil-based indirect solar power system due to the cost reduction in heat storage.

Suggested Citation

  • Li, Pengcheng & Lin, Haiwei & Li, Jing & Cao, Qing & Wang, Yandong & Pei, Gang & Jie, Desuan & Zhao, Zilong, 2022. "Analysis of a direct vapor generation system using cascade steam-organic Rankine cycle and two-tank oil storage," Energy, Elsevier, vol. 257(C).
    • Handle: RePEc:eee:energy:v:257:y:2022:i:c:s0360544222016796
    DOI: 10.1016/j.energy.2022.124776
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    References listed on IDEAS

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    1. Li, Pengcheng & Ye, Jing & Li, Jing & Wang, Yandong & Jiang, Xiaobin & Qian, Tongle & Pei, Gang & Liu, Xunfen, 2023. "Thermodynamic and techno-economic analysis of a direct thermal oil vaporization solar power system," Energy, Elsevier, vol. 282(C).

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