槽式太阳能集热管内导热油结焦产物特性分析

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (2): 49-54.

槽式太阳能集热管内导热油结焦产物特性分析

董军¹, 张馨^2,3, 雷东强^*2,3, 韦安柱⁴, 张亚南¹

1.中广核太阳能开发有限公司, 北京 100070;
2.中国科学院电工研究所, 北京 100190;
3.中国科学院大学, 北京 100049;
4.中国石化润滑油有限公司北京研究院, 北京 100085

收稿日期:2022-04-16 出版日期:2024-04-28 发布日期:2024-04-29
通讯作者: 雷东强 (1980-),男,河北晋州人,博士. Email:leidq@mail.iee.ac.cn
基金资助:
国家重点研发计划(2019YFE0102000)

Characteristic analysis of coking product of thermal oil in parabolic trough receivers

DONG Jun¹, ZHANG Xin^2,3, LEI Dong-qiang^2,3, WEI An-zhu⁴, ZHANG Ya-nan¹

1. CGN Solar Energy Development Co. Ltd., Beijing 100070, China;
2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Beijing Research Institute, Sinopec Lubricant Company, Beijing 10085, China

Received:2022-04-16 Online:2024-04-28 Published:2024-04-29

摘要/Abstract

摘要： 鉴于槽式太阳能集热管壁面堆积的结焦产物对集热管安全问题及其内导热油流动和换热的影响,分析了某槽式太阳能热发电系统运行3年后集热管结焦产物的表观形貌和产物特性.结果表明:结焦产物在金属内管周向呈现聚光侧较厚、坑洼状的粗糙表面和非聚光侧较薄的非均匀分布;结焦产物颗粒立体感明显,具有结焦团聚焦和分散焦2种形式;结焦产物堆积后真密度为1.259 7 g/cm³, 通过DSC蓝宝石法测得比热容为0.83~2.11 J/(g·K);使用闪光法在400 ℃时测得有结焦产物的不锈钢金属内管样品导热系数为24.05 W/(m·K),比无结焦产物的不锈钢金属内管样品导热系数降低了21.7%,由此说明结焦产物显著影响金属内管的传热性能.

关键词: 槽式太阳能集热管, 结焦产物, 传热性能

Abstract: Aiming at the impact of the coking product on the inner wall of the parabolic trough receiver on the heat transfer of the heat conduction oil and the safety of the receiver, the apparent morphology and characteristics of the coking product in the receiver of a trough solar thermal system after three years of operation were studied. The results show that the coking product presents a thick, pit-like rough surface in the circumferential direction of the metal tube, and a thin non-uniform distribution on the non-focusing side. Additionally, the particles of coking products display distinct three-dimensional characteristics, appearing as two forms of coking agglomeration focusing and dispersed coking. The true density of coking products after stacking is 1.259 7 g/cm³, and their specific heat capacity ranged from 0.83 to 2.11 J/(g·K) as measured by the Differential Scanning Calorimetry (DSC) Sapphire method. Furthermore, the thermal conductivity of bulk metal tube samples with coking products is 24.05 W/(m·K), measured using the flash method at 400 ℃, indicating a 21.7% decrease compared to non-coking metal tubes. The coking product significantly affected the heat transfer performance of the metal tube for the parabolic trough receiver.

Key words: parabolic trough receiver, coking product, heat-transfer performance

中图分类号:

TK513.3

董军, 张馨, 雷东强, 韦安柱, 张亚南. 槽式太阳能集热管内导热油结焦产物特性分析[J]. 兰州理工大学学报, 2024, 50(2): 49-54.

DONG Jun, ZHANG Xin, LEI Dong-qiang, WEI An-zhu, ZHANG Ya-nan. Characteristic analysis of coking product of thermal oil in parabolic trough receivers[J]. Journal of Lanzhou University of Technology, 2024, 50(2): 49-54.

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