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为减少湿蒸汽损失,汽轮机低压缸设计中需要知道湿蒸汽的水滴参数。水滴参数与凝结过程紧密相连,但目前已有的凝结理论模型和实验室中的喷嘴实验结果不能直接应用于真实的汽轮机中。简单介绍了汽轮机低压缸内湿蒸汽的凝结机制和新研制的改进型湿蒸汽测量系统的工作原理。基于实测变背压过程中直接空冷机组低压汽轮机末级后的蒸汽湿度参数并结合凝结机制,分析变背压过程中蒸汽湿度参数的变化规律及原因,证实了汽轮机中存在异质凝结现象以及凝结从异质为主向均质为主转变的过程。
In order to reduce the loss of wet steam, it is necessary to know the droplet parameters of the wet steam in the design of the low-pressure cylinder of the steam turbine. The parameters of water droplet are closely connected with the condensation process. However, the experimental results of the existing condensation theory model and laboratory nozzle can not be directly applied to a real steam turbine. The condensation mechanism of wet steam in the low pressure cylinder of steam turbine and the working principle of the newly developed wet steam measuring system are briefly introduced. Based on the measured steam humidity parameters of the low-pressure turbine of the direct air-cooled unit during the actual backpressure combined with the condensation mechanism, the change law and reason of the steam humidity parameter during the backpressure analysis are analyzed. It is confirmed that there are heterogeneous condensation phenomena in the steam turbine and condensation From heterogeneity to homogenization-based transformation process.