Startup and isothermal performance of high-temperature molten salt heat pipe

doi:10.11949/0438-1157.20200194

Abstract

Abstract:

High-temperature heat pipe is the key technology for efficient heat transfer in high-temperature fields. To develop high efficiency heat pipes further and improve the heat transfer performance in industrial process, gravity heat pipes with molten salt as heat transfer medium was developed. A high-temperature heat pipe test bench was set up and effect of working fluids and inclination angles on the startup characteristics and isothermal performance of the gravity heat pipe was studied experimentally. The results showed that as the inclination angle was 45° and 60°, the startup characteristics of heat pipes with AlBr₃ and TiCl₄ as working fluids was the best respectively, while the isothermal performance of the heat pipes was the best as the inclination angle was 60°. The inorganic salts AlBr₃ and TiCl₄ are used as the heat transfer working medium, and the gravity heat pipe has good starting and isothermal properties.

Key words: molten salt, heat pipe, condensation, transport, startup

摘要：

高温热管是高温领域高效传热的关键技术。为进一步研究开发高效热管，提升工业过程传热性能，以熔盐作为热管的传热工质，搭建了高温热管传热实验台，研究了传热工质和倾斜角对热管启动和等温性能的影响。结果表明，在450～700 K工作温度范围内，AlBr₃和TiCl₄熔盐热管在倾斜角为45°和60°的条件下，均达到最优的启动性能；在热管倾斜角为60°时，两种熔盐热管等温性能均达到最佳。无机盐AlBr₃和TiCl₄作为传热工质，重力热管具有良好的启动和等温性能。

关键词: 熔盐, 热管, 凝结, 传递, 启动

CLC Number:

TK 124

Gang WANG,Yaxuan XIONG,Yuting WU,Peng XU,Guanghui LENG,Chongfang MA. Startup and isothermal performance of high-temperature molten salt heat pipe[J]. CIESC Journal, 2020, 71(11): 5099-5106.

王刚,熊亚选,吴玉庭,徐鹏,冷光辉,马重芳. 高温熔盐热管的启动和等温性能[J]. 化工学报, 2020, 71(11): 5099-5106.

Figures/Tables 13

Fig.1 Schematic diagram of the experimental apparatus for high temperature molten salt gravity heat pipe

Fig.2 Image of the experimental apparatus for high temperature molten salt gravity heat pipe

Table 1 The model of mechannical vaccum pump and working parameters

关气镇极限

全压力/Pa

气镇极限

全压力/Pa

气镇极限

分压力/Pa

Table 2 The model of diffusion pump and working parameters

主要部件	型号	极限压力/Pa	抽气速度/(L·s^-1)	最大排气压力/Pa	加热功率/kW	冷却水耗量/(L·s^-1)
扩散泵	KT-150	5×10^-4	1000	40	1.0	0.083

Table 3 The model of electric heating furnace and working parameters

主要部件	型号	炉口直径/mm	炉膛内高/mm	额定功率/kW	最大工作温度/℃	额定工作温度/℃
电加热炉	SG2-7	30	1000	7	1000	1300

Fig.3 Heat pipe structure and wall temperature measurement point

Table 4 Basic characteristics of working fluid of heat pipe

熔化潜热/

(kJ·kg^-1)

AlBr₃

TiCl₄

C₁₀H₈

Fig.4 Inclination angles of gravity heat pipe

Fig.5 Temperature change of heat pipe wall of 1# heat pipe under different inclination angle

Fig.6 The maximum axial temperature difference changes with time during the start-up phase of the heat pipe

Fig.7 Wall temperature distribution of molten salt heat pipes at different inclination angles

Fig.8 Start-up performance of heat pipes with different heat transfer media

Fig.9 Isothermal performance of heat pipes with different heat transfer media

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