It is noticed in a few steam turbines that there are a pad temperature rise of more than and a radial journal movement of more than 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.
Issue Section:
Technical Briefs
1.
Bloch
, H. P.
, 1995, A Practical Guide to Steam Turbine Technology
, McGraw-Hill
, New York
.2.
Fridh
, J. E. A.
, 2002, “Partial Admission in Axial Turbines
,” SNEA Technical Report No. P12457-2.3.
Boulbin
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, Penneron
, N.
, Kermarec
, J.
, and Pluviose
, M.
, 1992, “Turbine Blade Forces Due to Partial Admission
,” Revue Francaise de Mecanique
, 1992
(3
), pp. 203
–208
0373-6601.4.
Elliott
, T. C.
, Chen
, K.
, and Swanekamp
, R. C.
, 1998, Standard Handbook of Powerplant Engineering
, McGraw-Hill
, New York
.5.
Lakshminarayana
, B.
, 1996, Fluid Dynamics and Heat Transfer of Turbomachinery
, Wiley
, New York
.6.
Lampart
, P.
, Szymaniak
, M.
, and Rzadkowski
, R.
, 2004, “Unsteady Load of Partial Admission Control Stage Rotor of a Large Power Steam Turbine
,” ASME Conference Proceedings
, 2004
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), pp. 237
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.7.
TCE
, 2003, “Partial Arc Admission in Steam Turbines
,” Turbo Components & Engineering, Technical Report, URL: http://www.tce1.com/Newsletters/5-2.pdfhttp://www.tce1.com/Newsletters/5-2.pdfCopyright © 2010
by American Society of Mechanical Engineers
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