Study on Vacuum Tightness for Direct Air Cooling System
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摘要: 真空严密性试验是确定凝汽器真空是否泄漏的重要方法, 而漏空气是影响直接空冷机组真空的主要因素之一。从理论上分析了空冷凝汽器经历的传热和热力学过程, 建立了空冷凝汽器真空严密性的数学模型, 由此得到了进行严密性试验时背压随试验时间的变化关系, 为分析空冷机组真空严密性变化规律提供了依据。以200MW空冷机组数据为例进行了实例计算, 对比实际进行真空严密性试验测得的关系曲线, 两者基本相似。并由此引出对不同容量的直接空冷机组真空严密性试验标准的探讨, 指出不同机组应根据其真空容积和设计漏空气量制定合适的标准。Abstract: The experiment of vacuum tightness is an important method to test whether the leakage of condenser vacuum occurs because air leakage is one of the major factors that affect the vacuum of direct air cooling unit. The mathematical model of vacuum tightness for air cooled condenser power plant is established through the theoretical analysis of heat transfer and thermodynamic processes. The changing trend of the back pressure with the experimental time is obtained, which will provide the basis data for analyzing the changing rule of vacuum tightness. A case of 200MW air cooled power plant has been studied, and the simulated results are very close to the actual measured data. The standard of vacuum tightness test for the direct air cooling units under different capacities is also discussed. Different power units should establish appropriate standards according to their respective vacuum volumes and designed air leakage volumes.
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