深度调峰运行汽轮机低压缸气动性能分析  

Aerodynamic Performance Analysis of Low Pressure Cylinder in Deep Peaking Operation of Steam Turbine

作　　者：邵峰 王志刚 谭锐 黄新长 殷戈 伍仁杰 于强 王忠熬 SHAO Feng;WANG Zhi-gang;TAN Rui;HUANG Xin-chang;YIN Ge;WU Ren-jie;YU Qiang;WANG Zhong-ao(Guoneng Nanjing Power Experimental Research ICL,Nanjing 210046,China)

机构地区：[1]国能南京电力试验研究有限公司,南京210046

出　　处：《汽轮机技术》2024年第4期266-270,共5页Turbine Technology

摘　　要：研究发现,汽轮机低负荷运行时低压缸存在叶片汽流激振、叶片鼓风、动静碰摩和叶片水蚀等风险。为解决该项技术难题,利用数值验证方法,对不同负荷工况低压缸流场进行气动性能计算,并完成低压缸末级和次末级鼓风加热特性和温度场分布的研究。研究结果表明,低压缸在负荷降低至40%THA时,开始出现分离涡,整个末级叶片近一半区域处于鼓风加热状态;随负荷降低漩流被拉伸变大,至20%THA负荷回流涡几乎堵塞了整个流道,整个末级动叶进入鼓风加热状态。为减少负荷深调时低压缸鼓风损失,需在设计和改造时选择末级短叶片,并在运行过程中尽量降低机组背压。The study found,there are some risks in low-pressure cylinder of steam turbine in low-load operation,such as steam flow excitation,blade blowing,dynamic and static friction,and blade water erosion.To solve this technical problem,in this paper,the numerical verification method is used,the aerodynamic performance of low pressure cylinder under different load conditions was calculated,the characteristics of blast heating and the distribution of temperature field in the last and second last stages of low pressure cylinder are studied.The results of the study,low-pressure cylinder when load is reduced to 40%THA,the vortex of separation begins to appear,nearly half of the last stage blade is in the state of blast heating;As the load decreases,the swirl is stretched,to 20%THA load the reflux vortex nearly blocks the entire flow passage,the entire last stage rotor enters the blast heating state.In order to reduce the pressure cylinder blast loss when the load is deeply adjusted,need to select the last stage short blade in the design and transformation,and in the process of operation to reduce the unit back pressure.

关 键 词：深度调峰 低压缸流场 气动性能 分离涡 鼓风加热 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]