Study on Startup Characteristics and Operation Limits of Medium-Temperature Dowtherm Heat Pipe
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摘要: 基于大型核电厂高温回路以及新型核反应堆对中温热管及热管换热器非能动系统的需求，以及促进中温热管在工业领域中品位温区的传热节能应用，通过实验测试温度响应的方法开展了基于导热姆A工质的中温热管的启动特性和工作极限研究。启动实验结果显示中温导热姆热管的启动温度在200℃左右，而在250℃前能够实现热管完全启动成功。极限实验结果证明了中温导热姆热管的工作极限温度是497℃；当其冷凝段冷却能力足够时，中温导热姆热管的稳定运行温度可以超过400℃。Abstract: Based on the needs of passive heat removal system using medium-temperature heat pipes (MTHPs) and heat pipe heat exchangers (HPHEs) in the high temperature circuit of large nuclear power plant and the novel nuclear reactor, and promoting their applications in industrial heat transfer and energy conservation at medium-grade temperature zone, a study of start-up characteristics and operation limit features of a MTHP (using Dowtherm-A as working medium) was conducted through the experimental method of testing the temperature response. The startup test results show that the startup temperature of the Dowtherm-A heat pipe (DHP) is about 200℃ and the DHP can start up completely before 250℃. The limit test results demonstrate that the operation limit temperature of the DHP is 497℃ and it will work stably over 400℃ if its condenser is well cooled.
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图 1 导热姆热管传热性能实验装置平台
T1—冷却水箱入水口水温测点；T2—冷却水箱出水口水温测点；T3—加热段最底部位置的热管外壁面温度测点；T4—加热段中间位置的外壁面温度测点；T5~T7—冷凝段的热管外壁面温度测点
Figure 1. Experiment Setup for Thermal Performance of DHP
图 2 热管从启动到准稳态过程部分测点的温度响应图
Figure 2. Temperature Response of Some Test Points during Startup to Quasi-Steady-State of Heat Pipe
图 3 热管冷凝段附近各测点的温度响应
Figure 3. Temperature Response of Test Points at Condenser Wall of Heat Pipe
图 5 热管在完全启动后的全部测点的温度响应图
Figure 5. Temperature Response of All Test Ponits of Heat Pipe after Full Startup
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