变汽温试验参数对高中压缸间轴封漏汽量计算的影响分析

发布时间：2018-03-26 14:35

  本文选题：汽轮机　切入点：轴封漏汽　出处：《汽轮机技术》2016年01期

【摘要】：针对亚临界330MW机组和超临界660MW机组,研究了高中压缸间轴封漏汽量计算值与变汽温试验参数的关系。对于亚临界330MW机组,试验时主汽温和再热汽温的温差不同,高中压缸间轴封漏汽量占主蒸汽流量的百分比从0.49%到2.42%,实际中压缸效率从89.89%到90.41%;对超临界660MW机组,高中压缸间轴封漏汽量占主蒸汽流量的百分比从0.81%到1.53%,实际中压缸效率从88.79%到89.26%;随着轴封漏汽量增大,实际中压缸效率降低。亚临界330MW机组,由于试验时温差较小,不同的工况组合,实际中压缸效率和高中压缸间轴封漏汽量变化较大;两种容量的机组,降低主汽温度工况和额定参数工况组合,得到的轴封漏汽量都偏差较大。通过计算轴封间隙通流能力,以及对比设计值和试验结果,确认变汽温工况试验时,主汽温度和再热汽温度的试验温差应该达到15℃以上,才能得到较为准确的高中压缸间轴封漏汽量和实际中压缸效率。
[Abstract]:For subcritical 330MW units and supercritical 660MW units, the relationship between the calculated values of axial seal steam leakage and the parameters of variable steam temperature test is studied. For subcritical 330MW units, the temperature difference between main steam and reheat steam temperature is different during the test. The leakage of shaft seal between middle and middle pressure cylinders is from 0.49% to 2.42% of the main steam flow, and the actual efficiency of medium pressure cylinder ranges from 89.89% to 90.41%. The leakage rate of shaft seal between middle and middle pressure cylinders ranges from 0.81% to 1.53% of the main steam flow, and the actual efficiency of medium pressure cylinder ranges from 88.79% to 89.26. With the increase of shaft seal leakage, the actual medium pressure cylinder efficiency decreases. The subcritical 330MW unit has a small temperature difference during the test. Under different working conditions, the actual medium pressure cylinder efficiency and the leakage volume of the shaft seal between the middle and middle pressure cylinders vary greatly; the combination of the two capacity units reduces the main steam temperature working condition and the rated parameter working condition, The difference between the main steam temperature and the reheat steam temperature should be more than 15 鈩，

本文编号：1668263