Numerical Study of New-Type Receiver with Axially-Hollow Spiral Deflector for Parabolic Trough Direct-Steam-Generation Loop of Concentrating Solar Power System

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  • 1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
    2. Adv Energy Sci & Technol Guangdong Lab, Foshan Xianhu Lab, Xianhu Hydrogen Valley, Foshan 528200, China

网络出版日期: 2023-11-28

基金资助

This work is financially supported by the National Natural Science Foundation of China (52176202) and the Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory (41200101).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Numerical Study of New-Type Receiver with Axially-Hollow Spiral Deflector for Parabolic Trough Direct-Steam-Generation Loop of Concentrating Solar Power System

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  • 1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
    2. Adv Energy Sci & Technol Guangdong Lab, Foshan Xianhu Lab, Xianhu Hydrogen Valley, Foshan 528200, China

Online published: 2023-11-28

Supported by

This work is financially supported by the National Natural Science Foundation of China (52176202) and the Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory (41200101).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

线聚焦抛物槽式(PT)太阳能直接蒸汽发生技术(DSG)因其发展较为成熟、整体成本相对较低、易于规模化等优点而具有广阔的发展前景,但其中集热管的热应力变形问题对系统整体性能和可靠性负面影响因其内部流体自身特性而尤为显著。本工作提出一种带有轴向镂空内螺旋导流器的新型集热管,通过集热管结构优化解决上述问题。对于典型PT-DSG回路的预热段、沸腾段和过热段建立了光-热-流动多物理场耦合模型并进行数值模拟。结果表明,新型集热管具有良好的综合性能,螺旋导流器混合流体使管段周向温差最小化,同时轴向镂空结构降低了流阻成本。通过引入管段周向温度均匀性改善指标ε△t和传热性能综合评价因子PEC对结果进行定量评价,对不同的需求目标提出不同的结构优化方案。当ε△t为主要改善指标时,选取扭率为1的导流器结构形式,在预热段、沸腾段、过热段得到的ε△t分别为25.4%,25.7%,41.5%,得到的PEC分别为0.486,0.878,0.596;当PEC为主要改善指标时,选取扭率为6-6.5导流器结构形式,在预热段、沸腾段、过热段得到的PEC分别为0.950,2.070,0.993,得到的ε△t分别为18.2%,13.3%,19.4%。

本文引用格式

SHI Yaolu, SUN Jie, WEI Jinjia . Numerical Study of New-Type Receiver with Axially-Hollow Spiral Deflector for Parabolic Trough Direct-Steam-Generation Loop of Concentrating Solar Power System[J]. 热科学学报, 2023 , 32(2) : 597 -610 . DOI: 10.1007/s11630-023-1760-8

Abstract

The thermal stress-induced deformation issue of receiver is crucial to the performance and reliability of a parabolic-trough (PT) concentrating solar power (CSP) system with the promising direct steam generation (DSG) technology. The objective of the present study is to propose a new-type receiver with axially-hollow spiral deflector and optimize the geometric structure to solve the above issue. To this end, optical-flow-thermal multi-physics coupling models have been established for the preheating, boiling and superheating sections of a typical PT-DSG loop. The simulation results show that our proposed new-type receiver demonstrates outstanding comprehensive performance. It can minimize the circumferential temperature difference through the spiral deflector while lower the flow resistance cost through the axially hollow structure at the same time. As quantitatively evaluated by the temperature uniformity improvement (ε∆T) and the performance evaluation criteria (PEC), different designs are achieved based on different optimal schemes. When ε∆T is of primary importance, the optimal design with torsional ratio of 1 is achieved, with ε∆T=25.4%, 25.7%, 41.5% and PEC=0.486, 0.878, 0.596 corresponding to preheating, boiling, superheating sections, respectively. When PEC is of primary importance, the optimal design with torsional ratio of 6–6.5 is achieved, with PEC=0.950, 2.070, 0.993 and ε∆T=18.2%, 13.3%, 19.4% corresponding to preheating, boiling, superheating sections, respectively.

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