论文部分内容阅读
在稳定工况下,汽轮机转子温度变化最剧烈的地方是前轴封段,其剧烈变化的程度决定于轴封蒸汽系统。本文叙述了针对上海汽轮机厂生产的300兆瓦汽轮机完善化前后所采用的两种不同轴封蒸汽系统,进行了温度场和热应力场的计算。计算采用有限元素法,在709型计算机上进行。根据结果分析,论述了轴封蒸汽系统的改进,虽然会引起轴封段金属温度的提高和热应力增加,但是没有超过允许范围。而且轴封蒸汽系统这样改变后将使得高压缸胀差和内缸温差过大问题得到解决。改进方案是合理的。
Under steady conditions, the most dramatic change in temperature of the turbine rotor is the seal of the front shaft, the extent of which varies drastically depending on the shaft seal steam system. This paper describes the calculation of temperature field and thermal stress field for two different shaft seal steam systems used before and after the steam turbine plant of Shanghai Steam Turbine 300MW is perfected. Calculation using finite element method, carried out on a 709 computer. Based on the analysis of the results, the improvement of the steam seal system is discussed. Although the metal temperature and the thermal stress increase in the shaft seal section, the allowable range is not exceeded. And shaft seal steam system so changed will make high-pressure cylinder differential expansion and cylinder temperature difference is too large to be solved. Improve the program is reasonable.