非能动余热排出换热器池沸腾换热性能研究
Research on Characteristics of Pool Boiling for Passive Residual Heat Removal Heat Exchanger
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摘要: 以浸没在高位水箱中的竖直管束为研究对象，对不同热负荷条件下竖直管束的池沸腾换热特性进行研究，通过对比中心管与周围旁管外壁面过热度、凝液量的变化，分析了中心管与旁管换热特性的差异。实验结果表明，换热管束的换热能力明显优于单管，在相同热流密度条件下，管束沸腾换热系数可达到单管的1.2～1.5倍。与旁管相比，低热负荷条件下，中心管的换热能力优于旁管；高热负荷条件下，中心管的换热能力则不及旁管，在热流密度大于200 kW/m2时，旁管的沸腾换热系数相对于中心管提高了近7%，且从实验数据的变化趋势来看，旁管较中心管的沸腾换热能力有随热流密度增加而逐渐增大的趋势。Abstract: The pool boiling characteristic of vertical tube bundle was investigated by controlling the steam parameters in vertical tubes immersed in head water tank. Through the comparison of wall superheat and various condensate flow rate, the difference of boiling heat transfer coefficient between central tube and side tube was analyzed. The experimental results show that the boiling heat transfer coefficient of tube bundle is significantly better than that of single tube, which is about 1.2-1.5 times of single tube under the condition of same heat flux. Compared with side tube, the heat transfer capability of center tube is superior in low thermal load condition, while the performance of center tube is inferior in high thermal load condition. When heat flux is higher than 200 kW/m2, the boiling heat transfer coefficient of side tube increases about 7% with respect to that of center tube, which will be further expanded gradually with the increase of heat flux according to the trend of experimental data.
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Keywords:
- vertical tube bundle ,
- pool boiling ,
- center tube ,
- side tube
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