摘要
潍坊电厂330MW机组的凝汽器改造前存在着真空低和水质变差导致铜管泄漏趋势加重的现象,严重地影响了机组的经济性、安全性和带负荷能力。采用TEPEE两山峰形管束布置方式对凝汽器进行改造,利用数值模拟的方法计算了改造后凝汽器壳侧的汽相流动与传热特性,并用改造前后的性能试验结果进行了验证。模拟结果表明:改造后的TEPEE两山峰形管束布置方式有利于凝汽器壳侧蒸汽的流动与传热。性能试验结果表明:在设计冷却水进口温度、流量、凝汽器热负荷相同的条件下,改造后的凝汽器真空比改造前提高1.743kPa,端差下降4.63℃;凝汽器改造后,试验端差和修正后端差、修正后的凝汽器压力、循环水温升都达到设计指标。
The phenomena of lower vacuum, worse water quality and leakage trend of copper pipe becoming worse are exist on condenser of 330MW unit before energy saving retrofit. They affect the performance and load capacity of unit. The condenser is reconstructed with pipe bundle collocation model of TEPEE shape. Numerical simulation is used to calculate the steam flow and heat transfer performance on shell side of condenser after retrofit. Its results are verified by performance test before and after condenser reform. The result of simulation shows that the TEPEE shape of pipe bundle collocation model is more suitable for steam flow and heat transfer on shell side. The data of condenser performance test show that the vacuum after retrofit increases 1. 743kPa,terminal temperature difference decreases 4.63~C at the design inlet temperature and fluid flow of coohng water,and the same heat load of condenser . After retrofit , all of the test and corrected terminal temperature difference, corrected condenser pressure and temperature increase achieves the design data.
出处
《汽轮机技术》
北大核心
2010年第2期150-154,共5页
Turbine Technology
关键词
330MW机组
凝汽器
节能改造
流动与传热特性
数值分析
330MW unit
condenser
energy-saving retrofit
flow and heat transfer performance
numerical analysis
