Study on Water Erosion in Deep Peak Shaving of Steam Turbine

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

Abstract

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

CLC Number:

TK26

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.

Figures/Tables 10

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

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

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

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

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

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

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

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

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

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

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