300 MW汽轮发电机强迫循环蒸发冷却定子绕组温升计算

电机定子绕组内部蒸发冷却技术是中国自主创新技术，目前尚处于研究阶段，该文介绍了利用相变吸热原理实现电机定子绕组内部蒸发冷却的工作原理，并以300 MW汽轮发电机设计数据为依据，采用分相模型计算两相流动阻力，采用热量守恒方程计算蒸发点，经多次迭代，确定蒸发点位置、单相段和沸腾两相段绕组温度，并与试验值对比分析，说明相变传热方式冷却效果比无相变传热好，同时分析了通过流量调节可以控制蒸发点位置，防止两相流动阻力过大而引起气阻现象。该文提供的定子绕组温度计算方法为定子绕组内部蒸发冷却技术进一步应用于大型发电机提供理论依据。

Calculation of Temperature Distribution of Larger Evaporative Cooling Turbo-generator With Forced Inner Cooling System

Evaporative cooling for generator stator is an independent innovative technology developed by China. The development of the technology is in research stage. The mechanism of applying phase transition for evaporative cooling of the generator stator was introduced. Then based on the 300 MW turbo-generator design specification, the paper prov- ided the calculation results such as the two phase flow resistance using the separate phase calculation model and the evaporative point using the heat conservation equation. Through iterative calculation, the paper also got the results such as the position of the evaporative point and temperatures along the winding during the liquid phase and liquid-gas phase. Analysis of the calculation and the experiments demonstrates that the phase transition cooling is better than the specific heat cooling. Moreover, the calculation and the experiment also demonstrate how to control the evaporative position and prevent gas resistance overload from adjusting the flow flux. The calculations provided establish a theoretical base for applying evaporative cooling technology on large size turbine generator stator cooling.