ACP100非能动安全壳空气冷却系统换热性能模拟研究

Simulation Study on Heat Transfer Performance of Passive Containment Air Cooling System for ACP100

ACP100是中国核工业集团公司设计的模块化小型压水堆,非能动安全壳空气冷却系统(PAS)属于ACP100重要的专设安全设施之一,其在事故情况下的换热性能对ACP100的安全性能具有重要影响。本文采用ANSYS Fluent 19.0建立了PAS的CFD模型,研究了稳态事故工况条件下安全壳内壁面温度和空气相对湿度对PAS换热性能的影响。研究结果表明:在空气相对湿度为0%的条件下,安全壳内壁面温度从353.2 K升高至403.2 K,总换热功率增加1233.76 kW,安全壳内壁面温度对PAS换热性能有明显影响;在内壳内壁面温度为403.2 K的条件下,空气相对湿度从0%升高至100%,总换热功率增加46.51 kW,空气相对湿度对PAS的换热性能影响不显著。研究结果可以为PAS的设计和优化提供数据参考和支持,具有一定的工程实际意义。

ACP100 is a small modular pressurized water reactor designed by China National Nuclear Corporation(CNNC). The Passive containment Air cooling System(PAS) is one of the important Engineering Safety Feature of the small modular pressurized water reactor ACP100.The heat transfer performance of the PAS under accident conditions has an important impact on safety features of ACP100In this paper, ANSYS Fluent 19.0 was used to build a CFD model for the PAS, investigating the effects of inner wall temperature of the containment and air relative humidity on heat transfer performance of the PAS under accident scenarios at steady state. The numerical simulation results show that 1233.76 kW increase in the total heat transfer power when the inner wall temperature of the containment increases from 353.2 K to 403.2 K under the condition that the air relative humidity is 0%. Inner wall temperature of the containment has a significant influence on heat transfer performance of the PAS. 46.51 kW increase in the total heat transfer power when the air relative humidity increases from 0% to 100% under the condition that the inner wall temperature of the containment is 403.2 K. Air relative humidity has an insignificant influence on heat transfer performance of the PAS. The numerical simulation results can provide data reference and support for the PAS design and optimization,which could be practically meaningful on engineering basis.