原子能科学技术2011，Vol.45Issue(8)：931-936,6.
非能动余热排出换热器运行初始阶段换热特性研究
Research on Heat Transfer Characteristic of PRHR HX at Initial Operating Stage
李勇 1阎昌琪 1孙福荣 2孙立成1
作者信息
- 1. 哈尔滨工程大学核科学与技术学院,黑龙江哈尔滨150001
- 2. 国电环境保护研究院,江苏南京210031
- 折叠
摘要
Abstract
Aiming at the temperature rising in the secondary side of the passive residual heat removal heat exchanger (PRHR HX) at initial operating stage, experiments on the heat transfer of vertical tube bundle immerged in an elevated tank during the heating up period were performed. The results show that in the early stage of experiments, heat is transferred by single-phase natural convection due to the large subcooling of water. The water temperature rises gradually which leads to a thermal stratification phenomenon in the tank and the heat transfer capability decreases with the water temperature increasing. As the subcooling decreasing, the heat transfer mechanism transforms from single-phase convection to subcooling boiling gradually. After water reaches the saturation temperature, saturated pool boiling is the primary mechanism of heat transfer. Adop-ting Churchill &? Chu correlation, the natural convection heat transfer coefficient wasseparated from the total heat transfer coefficient. The proportion of single-phase naturalconvection and subcooling boiling at different heat transfer stages was analyzed. Thiswork provides certain directive significance to the design of PRHR HX.关键词
非能动余热排出换热器/自然对流/欠热沸腾Key words
passive residual heat removal heat exchanger? Natural convection/ subcooled boiling分类
能源科技引用本文复制引用
李勇,阎昌琪,孙福荣,孙立成..非能动余热排出换热器运行初始阶段换热特性研究[J].原子能科学技术,2011,45(8):931-936,6.
