有热管冷却的乏燃料池自然对流换热特性分析

Analysis of Natural Convection Heat Transfer in Spent Fuel Pool Cooled With Heat Pipe

将分离式热管作为长期非能动冷却系统应用于CAP1400乏燃料池,分离式热管的蒸发端布置在乏燃料池四周。本文运用数值模拟方法对具有热管冷却的乏燃料池内温度场和流场特性进行数值分析,并研究布置在池内的各排蒸发管管外对流换热强度。研究表明:当能动型冷却系统停止工作后,仅靠该非能动冷却系统可成功带走池内衰变热并保证池内不沸腾;内排蒸发管束外侧的对流换热系数高于外排蒸发管束,可达到外排管束的1.05倍,蒸发管上、下端的对流换热系数较大,中间段对流换热系数最小。研究结果对分离式热管运用于乏燃料池具有一定参考意义。

Split heat pipes were applied into CAP1400 spent fuel pool（SFP）as a complete passive cooling system,and the evaporation ends of split heat pipes were arranged around SFP.Numerical simulation method was used to analyze the temperature and velocity characteristics of SFP,and natural convection heat transfer ability outside of each row of the evaporation ends was also analyzed.The results show that when active cooling system out of work,this complete passive cooling system can successfully remove the decay heat from SFP and prevent SFP from boiling.The inner evaporation pipes have much higher heat transfer ability and can reach 1.05 times that of the outer pipes.The natural convection heat transfer coefficient is much larger on the upper and lower part than that on the middle part.This work will provide some references for applying split heat pipes into spent fuel pool.