低熔点四元硝酸盐圆管内受迫对流换热特性

doi:10.19799/j.cnki.2095-4239.2020.0020

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (4): 1091-1097.doi: 10.19799/j.cnki.2095-4239.2020.0020

低熔点四元硝酸盐圆管内受迫对流换热特性

张春雨(), 郭航(), 吴玉庭, 张灿灿, 叶芳, 马重芳

北京工业大学环境与能源工程学院，传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室，北京 100124

收稿日期:2020-01-07 修回日期:2020-01-19 出版日期:2020-07-05 发布日期:2020-06-30
通讯作者: 郭航 E-mail:zhangchunyu2017@emails.bjut.edu.cn;hangguo@bjut.edu.cn
作者简介:张春雨（1995—），男，硕士研究生，主要研究方向为熔盐及熔盐纳米流体受迫对流换热，E-mail：zhangchunyu2017@emails.bjut.edu.cn
基金资助:
国家重点研发计划项目(2017YFB0903603)

Forced convection heat transfer characteristics in a circular tube with low-melting-point quaternary nitrate

ZHANG"Chunyu(), GUO"Hang(), WU"Yuting, ZHANG"Cancan, YE"Fang, MA"Chongfang

Ministry of Education Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received:2020-01-07 Revised:2020-01-19 Online:2020-07-05 Published:2020-06-30
Contact: Hang GUO E-mail:zhangchunyu2017@emails.bjut.edu.cn;hangguo@bjut.edu.cn

摘要/Abstract

摘要：

为了验证经典对流换热关联式对于新型的低熔点四元硝酸盐的适用性，该文研究了不同工况下低熔点四元混合硝酸盐在套管式换热器内的受迫对流换热特性。通过套管式换热器内管中的熔盐与壳侧的导热油的换热实验，测量得到熔盐与导热油在套管式换热器实验段的进出口温度，并获得了熔盐与导热油的总传热系数。通过威尔逊分离法从总传热系数中分离得到熔盐侧的对流换热系数，从而研究圆管中熔盐的对流换热特性。结果表明：该低熔点四元盐在研究的充分发展紊流区域内，其雷诺数在1×10⁴～5×10⁴之间，普朗特数在4.9～15.5之间，熔盐和导热油的总换热系数在670～1300 W/(m²·K)之间，熔盐侧的对流换热系数在2900～7800 W/(m²·K)之间变化。根据实验数据拟合得出了低熔点四元盐在圆管中紊流段的对流换热关联式。将实验数据与经典的对流关联式比较发现，经典关联式仍然适用于低熔点四元混合硝酸盐的管内对流换热。该研究为熔融盐在太阳能热发电中的实际应用提供了参考数据。

关键词: 熔融盐, 受迫对流, 传热, 紊流段

Abstract:

The forced convection heat transfer characteristics of a low-melting-point quaternary nitrate in a tube-type heat exchanger are studied under different conditions to verify the applicability of the classical convection heat transfer correlation in this case. Based on the heat transfer experiment of the molten salt in the inner tube and the heat transfer oil on the shell side of the tube-type heat exchanger, the inlet and outlet temperatures of the molten salt and heat transfer oil in the test section of the tube-type heat exchanger are obtained. Further, the total heat transfer coefficients of the molten salt and heat transfer oil are obtained. Using the Wilson separation method, the convective heat transfer coefficient on the molten salt side is obtained from the total heat transfer coefficient to study the convective heat transfer characteristics of molten salt in a circular tube. Results show that the Reynolds number of the low-melting-point quaternary salt is 1 × 10⁴—5 × 10⁴, the Prandtl number is 4.9—15.5, and the total heat transfer coefficient of the molten salt and the heat transfer oil is 670—1300 W·m^-2·K^-1 in the fully developed turbulent region. The convective heat transfer coefficient on the molten salt side is 2900—7800 W·m^-2·K^-1. Subsequently, the correlation between convection and heat transfer in case of the low-melting-point quaternary salt in the turbulent section of the tube is obtained according to the experimental data. By comparing the experimental data with the classical convection correlations, the classical convection correlation is observed to be still applicable to convection heat transfer in a tube containing low-melting-point quaternary nitrate. This study provides reference data for the practical application of molten salt in solar thermal power generation.

Key words: molten salt, forced convection, heat transfer, turbulent section

中图分类号:

TM 121

张春雨, 郭航, 吴玉庭, 张灿灿, 叶芳, 马重芳. 低熔点四元硝酸盐圆管内受迫对流换热特性[J]. 储能科学与技术, 2020, 9(4): 1091-1097.

ZHANG Chunyu, GUO Hang, WU Yuting, ZHANG Cancan, YE Fang, MA Chongfang. Forced convection heat transfer characteristics in a circular tube with low-melting-point quaternary nitrate[J]. Energy Storage Science and Technology, 2020, 9(4): 1091-1097.

图/表 13

图1

图2

表1

表2

表3

图3

图4

图5

图6

图7

图8

图9

图10

参考文献 24

1	SERRANO-LOPEZ R, FRADERA J, CUESTA-LOPEZ S. Molten salts database for energy applications[J]. Chemical Engineering and Processing: Process Intensification, 2013, 73: 87-102.
2	吴玉庭, 任楠, 马重芳. 熔融盐显热蓄热技术的研究与应用进展[J]. 储能科学与技术, 2013, 2(6) : 586-592.
	WU Yuting, REN Nan, MA Chongfang. Research and application of molten salts for sensible heat storage[J]. Energy Storage Science and Technology, 2013, 2(6): 586-592.
3	HERRMANN U, KEARNEY D W. Survey of thermal energy storage for parabolic trough power plants[J]. Journal of Solar Energy Engineering, 2002, 124(2): 145-152.
4	DROUOT L P, HILLAIRET M J. The themis program and the 2500-kW themis solar power station at targasonne[J]. Journal of Solar Energy Engineering, 1984, 106(1): 83-89.
5	SATOH T, YUKI K, CHIBA S, et al. Heat transfer performance for high Prandtl and high temperature molten salt flow in sphere-packed pipes[J]. Fusion Science and Technology, 2007, 52(3): 618-624.
6	叶猛, 刘斌, 吴玉庭, 等. 熔融盐(LiNO₃)强制对流换热实验[J]. 工程热物理学报, 2008, 29(9): 1585-1587.
	YE Meng, LIU Bin, WU Yuting, et al. An experimental investigation of heat transfer during forced convection in molten salt (LiNO₃)[J]. Journal of Engineering Thermophysics, 2008, 29(9): 1585-1587.
7	LU J, HE S, LIANG J, et al. Convective heat transfer in the laminar-turbulent transition region of molten salt in annular passage[J]. Experimental Thermal and Fluid Science, 2013, 51: 71-76.
8	LU J, SHENG X, DING J, et al. Transition and turbulent convective heat transfer of molten salt in spirally grooved tube[J]. Experimental Thermal and Fluid Science, 2013, 47: 180-185.
9	LU J, HE S, DING J, et al. Convective heat transfer of high temperature molten salt in a vertical annular duct with cooled wall[J]. Applied Thermal Engineering, 2014, 73(2): 1519-1524.
10	XIAO P, GUO L, ZHANG X. Investigations on heat transfer characteristic of molten salt flow in helical annular duct[J]. Applied Thermal Engineering, 2015, 88: 22-32.
11	QIAN J, KONG Q, ZHANG H, et al. Performance of a gas cooled molten salt heat exchanger[J]. Applied Thermal Engineering, 2016, 108: 1429-1435.
12	HE Y L, ZHENG Z J, DU B C, et al. Experimental investigation on turbulent heat transfer characteristics of molten salt in a shell-and-tube heat exchanger[J]. Applied Thermal Engineering, 2016, 108: 1206-1213.
13	DONG X, BI Q, YAO F. Experimental investigation on the heat transfer performance of molten salt flowing in an annular tube[J]. Experimental Thermal and Fluid Science, 2019, 102: 113-122.
14	刘闪威, 吴玉庭, 崔武军, 等. 低熔点熔盐圆管内强迫对流换热[J]. 化工学报, 2015, 66(2): 530-536.
	LIU Shanwei, WU Yuting,CUI Wujun, et al. Forced convection heat transfer with low-melting point molten salt in circular pipe[J]. Journal of Chemical Industry and Engineering, 2015, 66(2):530-536.
15	ROCIO RODRIGUEZ-LAGUNA M DEL, GOMEZ-ROMERO P, TORRES C M S, et al. Development of low-melting point molten salts and detection of solid-to-liquid transitions by alternative techniques to DSC[J]. Solar Energy Materials and Solar Cells, 2019, 202, doi: 10.1016/j.solmat.2019.110107.
16	VILLADA C, JARAMILLO F, CASTANO J G, et al. Design and development of nitrate-nitrite based molten salts for concentrating solar power applications[J]. Solar Energy, 2019, 188: 291-299.
17	ZOU L, CHEN X, WU Y, et al. Experimental study of thermophysical properties and thermal stability of quaternary nitrate molten salts for thermal energy storage[J]. Solar Energy Materials and Solar Cells, 2019, 190: 12-19.
18	陈虎. 熔盐及熔盐纳米流体管内受迫对流的实验研究[D]. 北京: 北京工业大学, 2019.
	CHEN Hu. Experimental study on forced convection in tube with molten salt and molten salt-based nanofluids[D]. Beijing: Beijing University of Technology, 2019.
19	HOFFMAN H W, COHEN S I. Fused salt heat transfer (Ⅲ): Forced convection heat transfer in circular tubes containing the salt mixture NaNO₂-NaNO₃-KNO₃[R]. Oak Ridge: National Laboratory, 1960.
20	刘斌. 熔融盐圆管内强迫对流换热的实验研究[D]. 北京: 北京工业大学, 2009.
	LIU Bin. Experimental study for forced convection heat transfer with molten salt in a circular tube[D]. Beijing: Beijing University of Technology, 2009.
21	胡青松. 混合硝酸盐圆管内强迫对流换热及混合碳酸盐腐蚀性研究[D]. 北京: 北京工业大学, 2010.
	HU Qingsong. Study on forced convection heat transfer and corrosion of mixed carbonate in a circular tube of mixed nitrate[D]. Beijing: Beijing University of Technology, 2010.
22	BERNARDO E, EIAN C S. Heat-transfer tests of aqueous ethylene glycol solutions in an electrically heated tube[R]. Cleveland: Aircraft Engine Research Lab, 1945．
23	DREXEL R E, MCADAMS W H. Heat-transfer coefficients for air flowing in round tubes, in rectangular ducts, and around finned cylinders[R]. Cambridge: Massachusetts Inst of Tech Cambridge, 1945.
24	DIPPREY D F. An experimental investigation of heat and momentum transfer in smooth and rough tubes at various Prandtl numbers[D]. Pasadena: California Institute of Technology, 1961．

名称	单位	拟合公式	适用范围
比热容c_p_,s	J·(g·K)^-1	c_p_,s=1.77878-7.55155×10^-4t	220 ℃≤t≤450 ℃
导热系数λ_s	W·(m·K)^-1	λ_s=3.83349-0.02857t+8.07852×8.07852×10^-5t²-7.24056×10^-8t³	250 ℃≤t≤500 ℃
黏度η_s	Pa·s	η_s=0.44845e^(621.738/^t⁾ ×10^-3	220 ℃≤t≤450 ℃
密度ρ_s	kg·m^-3	ρ_s=2.22744-9.43393×10^-4t	220 ℃≤t≤450 ℃

名称	单位	拟合公式
比热容c_p_,o	kJ·(kg·K)^-1	c_p_,o=0.0034t+1.7051
导热系数λ_o	W·(m·K)^-1	λ_o=-1.744×10^-5t+0.1243
黏度ν_o	10^-6m²·s^-1	ν_o=48.328e^-^t^/21.403+0.8431
密度ρ_o	kg·m^-3	ρ_o=-0.6311t+1026.75

参数	范围	误差
熔盐进口温度	252.1～404.5 ℃	±0.1 ℃
熔盐出口温度	247.2～395.4 ℃	±0.1 ℃
导热油进口温度	124.6～145.2 ℃	±0.1 ℃
导热油出口温度	131.4～165.3 ℃	±0.1 ℃
导热油流量	0.465 kg/s	±1.2%

[1]	李洪涛, 张帅, 李旭东, 纪运广, 孙明旭, 李欣. 单罐式储能换热系统在热风无纺布工艺中的应用[J]. 储能科学与技术, 2022, 11(7): 2250-2257.
[2]	郭云琪, 盛楠, 朱春宇, 饶中浩. 基于模板法制备氧化铝纤维及其石蜡复合相变材料热性能[J]. 储能科学与技术, 2022, 11(2): 511-520.
[3]	王青萌, 刘志, 程晓敏, 程千驹, 吕泽安. In元素对Sn-Bi-Zn传热储热合金高温容器相容性的影响[J]. 储能科学与技术, 2022, 11(1): 9-18.
[4]	朱鸿章, 吴传平, 周天念, 邓捷. 磷酸铁锂和三元锂电池外部过热条件下的热失控特性[J]. 储能科学与技术, 2022, 11(1): 201-210.
[5]	吴炜, 李守成, 谢纬安. 翅片参数与PCM材料对散热器传热影响实验研究[J]. 储能科学与技术, 2021, 10(6): 2303-2311.
[6]	罗伊默, 芮金金, 徐薇, 彭晋卿, 折晓会, 李念平, 丁玉龙. 热化学储热反应器内水合盐物性调控及传热传质优化研究进展[J]. 储能科学与技术, 2021, 10(4): 1273-1284.
[7]	熊亚选, 张慧, 吴玉庭, 丁玉龙. 纳米颗粒对二元硝酸盐表面张力和密度的影响[J]. 储能科学与技术, 2021, 10(4): 1297-1304.
[8]	罗新梅, 古家安. 不同长径比的分形肋片强化PCM熔化传热数值分析[J]. 储能科学与技术, 2021, 10(2): 523-533.
[9]	盛鹏, 徐丽, 赵广耀, 韩燕, 吴玉庭. 新型混合硝酸熔盐的制备及热物性研究[J]. 储能科学与技术, 2021, 10(1): 170-176.
[10]	涂航, 张航, 刘丽辉, 李杰, 孙小琴. 相变混凝土墙体的传热性能研究[J]. 储能科学与技术, 2021, 10(1): 287-294.
[11]	李　昭, 李宝让, 崔　柳, 杜小泽. 高温熔盐基纳米流体热物性的稳定性研究[J]. 储能科学与技术, 2020, 9(6): 1775-1783.
[12]	周慧琳, 邱燕. 矩形单元蓄热特性及结构优化[J]. 储能科学与技术, 2020, 9(4): 1082-1090.
[13]	刘丽辉, 莫雅菁, 孙小琴, 李杰, 李传常, 谢宝姗. 纳米增强型复合相变材料的传热特性[J]. 储能科学与技术, 2020, 9(4): 1105-1112.
[14]	李新禹, 李朋, 韩忠贤, 刘涛, 王雷, 陈林. 弯曲角度对扁平热管传热性能的影响[J]. 储能科学与技术, 2020, 9(3): 840-847.
[15]	葛睿彤, 郑艺华. 燃料电池传热传质分析进展综述[J]. 储能科学与技术, 2020, 9(1): 40-56.

低熔点四元硝酸盐圆管内受迫对流换热特性

Forced convection heat transfer characteristics in a circular tube with low-melting-point quaternary nitrate

RichHTML

PDF

可视化

摘要/Abstract

引用本文

使用本文

图/表 13

参考文献 24

相关文章 15

编辑推荐

Metrics

本文评价