0
Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Study on Erosion Characteristics of Solid Particles in the First Reheat Stage Blades of a Supercritical Steam Turbine

[+] Author and Article Information
Liu-xi Cai

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: cailiuxi0920@163.com

Shun-sen Wang

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: sswang@mail.xjtu.edu.cn

Jing-ru Mao

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: jrmao@mail.xjtu.edu.cn

Juan Di

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 952527321@qq.com

Zhen-ping Feng

Institute of Turbomachinery,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zpfeng@mail.xjtu.edu.cn

Jun-jie Zhang

Shenhua Guohua (Beijing) Electric
Power Research Institute Co. Ltd,
Beijing 100025, China
e-mail: xlcxlc321@163.com

Ya-tao Xu

Shenhua Guohua (Beijing) Electric
Power Research Institute Co. Ltd,
Beijing 100025, China
e-mail: 1365690983@qq.com

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 10, 2014; final manuscript received July 14, 2014; published online November 11, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(4), 041506 (Apr 01, 2015) (10 pages) Paper No: GTP-14-1363; doi: 10.1115/1.4028262 History: Received July 10, 2014; Revised July 14, 2014; Online November 11, 2014

Reducing solid particle erosion (SPE) of blades is one of the most urgent problems for supercritical steam turbine power generation technology. Based on the erosion rate models and the particle rebound models of blade materials obtained through the accelerated erosion test under high temperature, erosion characteristics of the first reheat stage blades in a supercritical steam turbine was simulated and analyzed by three-dimensional numerical simulation method in this paper. The influence of operating conditions, particle size distribution in the inlet of nozzle, and axial clearance between vanes and rotating blades on the erosion distribution of cascade were explored quantitatively. Results show that the erosion damage of the first-reheat stage stator is mainly caused by suction surface impingement from oxide particles. In designed loading condition, small and medium size of particles mainly eroded the trailing edge (TE) of nozzle pressure surface, while large particles mainly impinge the leading edge (LE) of rotating blades and the TE of vane suction surface, and erosion increase along the blade height. When the turbine is running under part-load condition, particle impingement angle on stator pressure surface is basically unchanged, while impingement velocity slightly reduced. However, the amount of particles that impinge the stator TE suction side after their first-time impingement on rotor LE increase rapidly, leading to the more severe erosion damage of stator suction surface. The particle size distribution in the inlet of nozzle has a significant effect on the erosion simulation of first reheat stage blades, and the size distribution sampled in one unit may not be used to other units. When axial clearance changes, the erosion weight loss of vane pressure surface near TE is basically held constant, while the erosion weight loss in vane suction surface near TE decreases with the increase of axial clearance. For the supercritical 600 MW unit simulated in this article, the antiSPE performance and the unit efficiency can be balanced well when the axial clearance increases to 13 mm. The results in this paper will provide a technology basis for reducing oxide particle erosion in the first reheat stage blades of supercritical steam turbine.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Schematic diagram of test system for high-temperature SPE

Grahic Jump Location
Fig. 2

Particle rebound model and the error of fitting: (a) tangential velocity restitution coefficient and (b) normal velocity restitution coefficient

Grahic Jump Location
Fig. 3

Grid systems for the stage analysis

Grahic Jump Location
Fig. 4

The profile of stator and the definition of sr

Grahic Jump Location
Fig. 5

Steam velocity isoline distribution at midspan

Grahic Jump Location
Fig. 6

Top view of particle trajectories in the reheat stage passage under full loading condition: (a) 10 μm; (b) 60 μm; (c) 120 μm; and (d) 200 μm

Grahic Jump Location
Fig. 13

Calculated static entropy contours at midspan for two axial clearances: (a) δ = 5 mm; (b) δ = 15 mm

Grahic Jump Location
Fig. 12

Variation of erosion weight-loss on the stator TE and stage efficiency with the variation of δ

Grahic Jump Location
Fig. 11

Erosion weight loss along sr with two different inlet particle size distribution

Grahic Jump Location
Fig. 10

Impingement conditions along the reheat stator pressure surface under 30% full loading condition: (a) impingement velocity and (b) impingement angle

Grahic Jump Location
Fig. 9

Impingement conditions along the reheat stator pressure surface under full loading condition: (a) impingement velocity and (b) impingement angle

Grahic Jump Location
Fig. 8

Impingement parameters of 60 μm particles along the reheat stator pressure surface under full loading condition: (a) impingement velocity and (b) impingement angle

Grahic Jump Location
Fig. 7

Contours of erosion rate density distribution on the blade surface: (a) S-PS; (b) S-SS; (c) R-PS; and (d) R-SS

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In