汽轮机深度调峰的水蚀问题研究

doi:10.12096/j.2096-4528.pgt.21012

摘要/Abstract

摘要：

为研究汽轮机深度调峰引起的末级动叶片水蚀问题，提高机组的寿命，采用计算分析与机组运行经验结合的方法，在现有研究成果的基础上，结合合理的推论，综合考虑背压和负荷对水蚀的影响，建立了以相对容积流量为基准的叶片水蚀衡量方法。研究结果表明：随着相对容积流量减小，动叶水蚀部位从应力较小的顶部进汽边转移到应力较大的根部出汽边，危险性增大；动叶片水蚀率也随相对容积流量减小呈现出先上升、后下降、再上升的变化趋势，阶段间的转折点均对应一种平衡状态。

关键词: 汽轮机, 深度调峰, 叶片水蚀

Abstract:

In order to improve the life of the unit, and study the water erosion of the last stage moving blade caused by the deep peak shaving of steam turbine, this paper established a method to measure the water erosion of blade based on relative volumetric flow. The calculation analysis with operating experiences of the unit was employed. The influence of back pressure and load on water erosion comprehensively was taken into account. The results show that, with the decrease of relative volumetric flow rate, the water erosion part of the rotor blade is transferred from the top steam inlet side with lower stress to the root steam outlet side with higher stress. It results in the increase of risk. With the decrease of relative volume flow, the water erosion rate of moving blade shows three stages: first increasing, then decreasing, and rising finally. The turning point between stages corresponds to a balanced state.

Key words: steam turbine, deep peak shaving, water erosion of blade

中图分类号:

TK26

刘云锋, 李宇峰, 王健, 马义良, 关淳. 汽轮机深度调峰的水蚀问题研究[J]. 发电技术, 2021, 42(4): 473-479.

Yunfeng LIU, Yufeng LI, Jian WANG, Yiliang MA, Chun GUAN. Study on Water Erosion in Deep Peak Shaving of Steam Turbine[J]. Power Generation Technology, 2021, 42(4): 473-479.

图/表 10

图1 600MW湿冷机组相对排汽湿度与负荷关系

Fig.1 Relationship between relative exhaust steam humidity and load of 600 MW wet cooling unit

图2 北仑三期1 000 MW湿冷机组低压缸排汽湿度随负荷变化关系

Fig.2 Relationship between exhaust steam humidity of low pressure cylinder and load of 1000 MW wet cooling unit in Beilun phase Ⅲ

图3 600 MW湿冷机组低压末级动叶顶部温度随负荷变化

Fig.3 Variation of shroud temperature of L-0 blade of 600 MW wet cooling unit with load

图4 叶片材料2Cr13腐蚀介质下疲劳曲线

Fig.4 Fatigue curve of blade material 2Cr13 in corrosive medium

图5 600 MW湿冷机组末级叶片水蚀率与负荷关系

Fig.5 Relationship between water erosion rate of L-0 blade and load of 600 MW wet cooling unit

图6 600MW湿冷机组末级叶片水蚀率与背压关系

Fig.6 Relationship between water erosion rate and back pressure of L-0 blade of 600 MW wet cooling unit

图7 动叶水蚀原理示意图

Fig.7 Schematic diagram of water erosion principle of moving blade

图8 低压缸喷水与叶片水蚀示意图

Fig.8 Schematic diagram of water spray and blade erosion of low pressure cylinder

图9 某电厂末级动叶出汽边水蚀

Fig.9 Water erosion at the outlet edge of L-0 blade in a power plant

图10 末级动叶相对水蚀率随容积流量变化

Fig.10 Variation of relative water erosion rate of L-0 blade with volume flow rate

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