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Technical Briefs

Experimental Study on Fault Caused by Partial Arc Steam Forces and Its Economic Solution

[+] Author and Article Information
Daren Yu

Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.C.yudaren@hcms.hit.edu.cn

Yanfeng Duan1

Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.C.duanyanfeng@gmail.com

Jinfu Liu

Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.C.liujinfu@hcms.hit.edu.cn

Zhansheng Liu

Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.C.lzs@hit.edu.cn

Qinghua Hu

Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.C.huqinghua@hcms.hit.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 132(6), 064501 (Mar 16, 2010) (4 pages) doi:10.1115/1.4000090 History: Received February 08, 2009; Revised July 10, 2009; Published March 16, 2010; Online March 16, 2010

It is noticed in a few steam turbines that there are a pad temperature rise of more than 10°C and a radial journal movement of more than 50μm in the bearings adjacent to control stage when they operate under partial arc admission at 60–80% of their full load. It is found through fault mechanism analysis and experimental study that the fault is caused by partial arc steam forces acting on control stage. A fault characteristic is concluded to help identify this fault. Diagonal admission is therefore proposed as an economic solution for elimination of this fault and it is proved to be effective through practical test.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Variations in load, VJ2, TP2, LJ2H, and LJ2V during routine operation

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Figure 2

Steam forces acting on control stage and layout of GVs

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Figure 3

Rubbing accidents in bearing 2

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Figure 4

FPAH, FPAV, FB1H, and FB2H of 210 MW turbine

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Figure 5

Variations in load, MSP and FB2H during experiment

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Figure 6

Variations in LJ2H and TP2 during experiment

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Figure 7

Variation in TP2 under diagonal admission

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