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对某厂330 MW机组凝汽器改造前向心形管束布置和改造后TEPEE两山峰形管束布置的壳侧汽相流动与传热进行了数值模拟与比较.结果表明:改造前凝汽器结构设计不合理,上部管束得不到充分利用,导致凝汽器性能差;改造后TEPEE两山峰形管束布置使压降分布均匀,传热系数增大,更有利于凝汽器壳侧蒸汽的流动与传热.改造前后的性能试验结果表明:采用TEPEE两山峰形管束布置方式的凝汽器,其性能指标达到设计值,优于向心形管束布置方式;改造后凝汽器真空比改造前提高了1.743 kPa,端差下降4.63 K.
The numerical simulation and comparison of the shell-side vapor phase flow and heat transfer before and after the modification of the condenser of a 330MW unit in a TPSE were carried out. The results show that the condenser structure Unreasonable design and insufficient utilization of the upper tube bundle resulted in poor performance of the condenser. After the renovation, the arrangement of the peak-shaped tube bundles in TEPEE and the two peaks made the pressure drop distribution uniform and the heat transfer coefficient increased, which was more conducive to the steam flow in the condenser shell side And heat transfer.The results of the performance test before and after retrofitting show that the condenser with TEPEE two mountain-shaped tube bundles has better performance than the conical tube bundle design, Increased by 1.743 kPa and the terminal difference decreased by 4.63 K.