摘要
空冷汽轮发电机组件的可靠性依赖于冷却系统散热能力。随着空冷汽轮发电机容量的增加,发电机通风冷却系统不能及时带走产生的热量,将造成发电机绕组温度急剧升高,严重时会烧损绕组和铁心,造成巨大的经济损失,因此合理地优化发电机通风结构,可以提高传热介质的利用率,降低电机温升。主要针对全空冷60MW汽轮发电机通风系统的设计与优化问题,通过流体动力分析软件建立通风网络模型,结合局部阻力损失、沿程摩擦阻力及压力源特性,对定子和转子通风系统的风量分配及压力分布进行了仿真计算。研究发现,电机总风量为19.29m^(3)/s,低于经验设计值,主要原因为定子槽数较多、通风槽钢尺寸偏大导致压力损失增加。为此提出两项改造方案:短期通过调整风扇安装角至29°,使总风量提升至23.02m^(3)/s,有效降低温升;长期建议优化定子槽数及通风槽钢尺寸以降低阻力。研究结果验证了仿真方法的有效性,并为同类电机的通风系统设计提供了理论依据和工程参考。
The reliability of air-cooled turbo generator components depends on the heat dissipation capacity of the cooling system.As the capacity of air-cooled turbogenerators increases,if the generator's ventilation and cooling system fails to promptly remove generated heat,it will cause a sharp temperature rise in generator windings,potentially leading to severe damage of windings and iron cores,and significant economic losses.Therefore,optimizing the generator ventilation structure can enhance the utilization efficiency of heat transfer media and reduce temperature rise.The design and optimization of ventilation systems for 60 MW fully air-cooled turbo generators is focused on.By establishing a ventilation network model using fluid dynamic analysis software,combined with analyses of local resistance loss,frictional resistance along the path,and pressure source characteristics,simulation calculations are conducted for air distribution and pressure distribution in stator and rotor ventilation systems.The study reveals that the total airflow of 19.29 m^(3)/s is lower than empirical design values,primarily due to excessive stator slot numbers and oversized ventilation channels that increases pressure loss.Two improvement schemes are proposed:short-term adjustment of fan installation angle to 29°increases total airflow to 23.02 m^(3)/s,effectively reducing temperature rise.Long-term optimization of stator slot number and ventilation channel dimensions is recommended for resistance reduction.The research verifies the effectiveness of the simulation method and provides theoretical foundations and engineering references for ventilation system design of similar generators.
作者
吴俊濠
丁爱英
Wu Junhao;Ding Aiying(Steam Turbine Technology Department of Guangzhou Guangzhong Enterprise Group Corporation,Guangzhou 511495,China)
出处
《机电工程技术》
2025年第21期136-141,共6页
Mechanical & Electrical Engineering Technology
关键词
空冷汽轮发电机
通风系统优化
压力损失
风量分配
温升控制
air-cooled turbo generator
ventilation system optimization
pressure loss
airflow distribution
temperature rise control
