Pengcheng Li
Analysis of a direct vapor generation system using cascade steam-organic Rankine cycle and two-tank oil storage
Li, Pengcheng; Lin, Haiwei; Li, Jing; Cao, Qing; Wang, Yandong; Pei, Gang; Jie, Desuan; Zhao, Zilong
Authors
Haiwei Lin
Dr Jing Li Jing.Li@hull.ac.uk
Senior Research Fellow
Qing Cao
Yandong Wang
Gang Pei
Desuan Jie
Zilong Zhao
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.
Citation
Li, P., Lin, H., Li, J., Cao, Q., Wang, Y., Pei, G., …Zhao, Z. (2022). Analysis of a direct vapor generation system using cascade steam-organic Rankine cycle and two-tank oil storage. Energy, 257, Article 124776. https://doi.org/10.1016/j.energy.2022.124776
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 6, 2022 |
Online Publication Date | Jul 15, 2022 |
Publication Date | Oct 15, 2022 |
Deposit Date | Nov 11, 2022 |
Publicly Available Date | Nov 11, 2022 |
Journal | Energy |
Print ISSN | 0360-5442 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 257 |
Article Number | 124776 |
DOI | https://doi.org/10.1016/j.energy.2022.124776 |
Keywords | Direct vapor generation; Cascade steam-organic Rankine cycle; Thermal oil storage; Heat discharge; Equivalent payback period |
Public URL | https://hull-repository.worktribe.com/output/4045606 |
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Copyright Statement
2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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