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大尺度分离式热管具有无需电力驱动、换热效率高的特点,可用于断电事故后乏燃料水池非能动冷却,能有效提高核电厂的安全性能。针对大尺度分离式热管的传热特性开展实验研究,获得热管蒸发段外侧加热水流速0.007~0.02 m/s,加热水温度50~90℃,冷凝段冷却空气速度0.5~2.5 m/s参数范围下换热量、蒸发段平均换热系数、工作温度、工作压力以及循环流量随冷凝段风速、蒸发段热源进口温度和速度的变化规律。结果表明,大尺度热管的最大换热量达到20.1 kW。参数的敏感性分析表明,热源温度和热源流速对热管的循环流量、换热量具有显著的影响。冷凝段外冷却空气速度超过1.5 m/s后,其对分离式热管的影响相对较小。
The large-scale separated heat pipe has the characteristics of no electric drive and high heat exchange efficiency. It can be used for the passive cooling of the spent fuel pool after a power failure and can effectively improve the safety performance of a nuclear power plant. According to the heat transfer characteristics of the large-scale separated heat pipe, the heating water flow rate outside the heat pipe evaporation section is 0.007-0.02 m / s, the temperature of the heating water is 50-90 ℃ and the cooling air velocity of the condensing section is 0.5-2.5 m / s. The heat transfer, the average heat transfer coefficient of evaporation section, working temperature, working pressure and circulation flow rate with the condensation section velocity, evaporation section heat source inlet temperature and velocity. The results show that the maximum heat transfer capacity of large-scale heat pipe reaches 20.1 kW. The sensitivity analysis of the parameters shows that the heat source temperature and heat source flow rate have a significant effect on the circulation flow and heat transfer of the heat pipe. After the cooling air velocity outside the condensing section exceeds 1.5 m / s, the influence on the separated heat pipe is relatively small.