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Influence of valve governing mode on solid particle erosion and efficiency in governing stage of steam turbine

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  • Cao, Li-hua
  • Liu, Shuang
  • Li, Yan-chao
  • Si, He-yong

Abstract

Solid particle erosion (SPE) in governing stage is one of the concerns for large capacity steam turbine. Based on Euler-Lagrange method and Finnie erosion model, the influence of valve governing mode on SPE and efficiency of governing stage were numerically investigated. Results show that the erosion rate density of different circumferential nozzles changes greatly, and the erosion rate density of the most serious erosion nozzle is about 4 × 103 times that of the lightest erosion nozzle. The max erosion rate density of nozzle under sequential valve governing mode (SEVGM) is higher than that under single valve governing mode (SIVGM), in which the particle impact velocity plays a decisive role. With the increase of roughness, the governing stage efficiency decreases under two types of valve governing modes. Moreover, the governing stage efficiency under SEVGM decreases more obviously than that under SIVGM.

Suggested Citation

  • Cao, Li-hua & Liu, Shuang & Li, Yan-chao & Si, He-yong, 2020. "Influence of valve governing mode on solid particle erosion and efficiency in governing stage of steam turbine," Energy, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:energy:v:191:y:2020:i:c:s0360544219322765
    DOI: 10.1016/j.energy.2019.116581
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    References listed on IDEAS

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    1. Padhy, M.K. & Saini, R.P., 2012. "Study of silt erosion mechanism in Pelton turbine buckets," Energy, Elsevier, vol. 39(1), pages 286-293.
    2. Cai, Liu-xi & Wang, Shun-sen & Mao, Jing-ru & Di, Juan & Feng, Zhen-ping, 2015. "The influence of nozzle chamber structure and partial-arc admission on the erosion characteristics of solid particles in the control stage of a supercritical steam turbine," Energy, Elsevier, vol. 82(C), pages 341-352.
    3. Cai, Liuxi & Xiao, Junfeng & Wang, Shunsen & Gao, Song & Duan, Jingyao & Mao, Jingru, 2017. "Gas-particle flows and erosion characteristic of large capacity dry top gas pressure recovery turbine," Energy, Elsevier, vol. 120(C), pages 498-506.
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