TY - GEN
T1 - Analysis of thermalhydraulic characteristics of AP1000 passive residual heat removal heat exchanger
AU - Xie, Xu
AU - Tian, Wenxi
AU - Yu, Pei
AU - Nie, Changhua
AU - Zhan, Li
AU - Li, Pengzhou
PY - 2014
Y1 - 2014
N2 - Passive residual heat removal heat exchanger is a key equipment of AP1000 passive residual heat removal system, which plays an important role in the safe operation of the reactor. While the internal structure of its tube bundle is complex and large, the actual character of flow is hardly measured through experiment. In this paper, the computational fluid dynamics (CFD) method is applied to the thermal-hydraulic analysis, while the porous media model is used to simplify AP1000 passive residual heat removal heat exchanger tube. The 3-D steady state numerical simulation of the fluid flowing in the secondary side was done by using the CFD software ANSYS FLUENT14.0. Finally, the temperature as well as flow distribution in the secondary side of the heat exchanger are obtained. The heat transfer and flow characteristics can be obtained through the steady calculation of heat exchanger, aiming at analysis of natural circulation ability. It can be noted that the fluid in the secondary side of heat exchanger moves driven by the effect of thermal buoyancy, forming the natural cycle, which takes away heat in tube bundle region. The heat transfer in water tank is mainly enhanced by vortex and turbulent flow, caused by the large resistance of tube bundle region as well as large temperature difference. This phenomenon is obvious especially for the recirculation of flow near the tube bundle. The enduring change of flow rate and direction enhance the heat transfer. Besides, the big temperature difference helps to increase the driving effect of natural circulation. Consequently, the heat transfer of the tank is enhanced by above mechanism. From steady analysis of temperature and velocity of the secondary side, the temperature of the fluid must be above the boiling point if the tube bundle region is constantly heated. The results of this study contribute to the capacity analysis of passive residual heat removal of natural circulation system, providing valuable information for safe operation of AP1000.
AB - Passive residual heat removal heat exchanger is a key equipment of AP1000 passive residual heat removal system, which plays an important role in the safe operation of the reactor. While the internal structure of its tube bundle is complex and large, the actual character of flow is hardly measured through experiment. In this paper, the computational fluid dynamics (CFD) method is applied to the thermal-hydraulic analysis, while the porous media model is used to simplify AP1000 passive residual heat removal heat exchanger tube. The 3-D steady state numerical simulation of the fluid flowing in the secondary side was done by using the CFD software ANSYS FLUENT14.0. Finally, the temperature as well as flow distribution in the secondary side of the heat exchanger are obtained. The heat transfer and flow characteristics can be obtained through the steady calculation of heat exchanger, aiming at analysis of natural circulation ability. It can be noted that the fluid in the secondary side of heat exchanger moves driven by the effect of thermal buoyancy, forming the natural cycle, which takes away heat in tube bundle region. The heat transfer in water tank is mainly enhanced by vortex and turbulent flow, caused by the large resistance of tube bundle region as well as large temperature difference. This phenomenon is obvious especially for the recirculation of flow near the tube bundle. The enduring change of flow rate and direction enhance the heat transfer. Besides, the big temperature difference helps to increase the driving effect of natural circulation. Consequently, the heat transfer of the tank is enhanced by above mechanism. From steady analysis of temperature and velocity of the secondary side, the temperature of the fluid must be above the boiling point if the tube bundle region is constantly heated. The results of this study contribute to the capacity analysis of passive residual heat removal of natural circulation system, providing valuable information for safe operation of AP1000.
UR - https://www.scopus.com/pages/publications/84907078514
M3 - 会议稿件
AN - SCOPUS:84907078514
SN - 9781632668264
T3 - International Congress on Advances in Nuclear Power Plants, ICAPP 2014
SP - 1385
EP - 1392
BT - International Congress on Advances in Nuclear Power Plants, ICAPP 2014
PB - American Nuclear Society
T2 - International Congress on Advances in Nuclear Power Plants, ICAPP 2014
Y2 - 6 April 2014 through 9 April 2014
ER -
