600MW机组凝汽器壳侧数值模拟与应用

Numerical Simulation of Shell Side of a 600MW Power Plant Condenser and its Application

采用多孔介质模型数值研究了仿生双连树型管束及双峰型管束凝汽器壳侧的流动与传热特性。数模拟结果表明,仿生双连树型管束比双峰型管束的向心流动更明显,涡流更少且影响范围更小,空气聚集减弱,传热系数更为均匀。在600MW热负荷的设计工况下,HEI标准的设计背压应为4.9kPa,双峰型管束和仿生双连树型管束的数值模拟计算背压分别为5.37kPa和4.67kPa。邹县5号机组的工程试验测量仿生双连树型管束的背压为4.77kPa,与数值模拟结果相近,验证了数值模拟方法的可靠性。数值模拟和工程实践都验证了仿生双连树型管束具有显著的节能效果。

In order to adapt the requirement of energy conservation and emissions reduction, Zouxian power plant underwent the technical reform of its 600MW power plant condenser using the bionic double-tree-shaped tube bundle to replace the original double-peak-shaped tube bundle. The performance of these two tube arrangements was numerically analyzed using a porous medium model. The simulation results showed that, compared with double-peak-shaped tube bundle, the steam central -flow in the bionic double-tree-shaped tube bundle was more apparent, the vortices and the affected area were smaller , the air accumulation was reduced, the average heat transfer coefficient was more uniform. Under the design condition of 600MW heat load, the designed back pressure of HEI standard is 4.9 kPa. The simulation results indicated that the back pressure of double-peak-shaped and bionic double-tree-shaped tube bundle was 5.37 kPa and 4.67 kPa, respectively . The measured back pressure ( 4.77 kPa) of the rebuilt No.5 condenser with bionic double-tree-shaped tube bundle was almost equal to the simulation results, which indicated that the numerical mode was reliable. The numerical simulation and experimental results both valified that the bionic double-tree-shaped tube bundle was better than double-peak-shaped tube bundle.