Q20. You get the turbine repaired. There is something wrong with the rotor
blades.
A. might
B. has to
C. need
D. have to
Answers
Answer:
Steam turbine rotors bend during operation, but the bearing and supports are designed to keep the static and dynamic forces under control. However, bending can cause impact between stationary and rotating parts—often cascading impacts. An operator of many utility-scale steam turbines shares its extensive field experience identifying the root cause of failures as well as successful solutions.
Rotor bending that results in premature failure of steam turbine blades and other internal components is one of the most serious problems experienced in power plant operations. The problems often reduce plant availability by limiting generation and increase plant operation and maintenance cost. Extreme rotor bending problems often involve interaction between the turbine’s rotor and stationary parts. Rotor bending may be caused by a variety of static and dynamic factors, many of which will be explored in this article.
We begin with mechanical factors related to the rotor, the largest rotating assembly in the turbine. Working from the inside out, we next look at rotor balance issues, followed by rotor and casing misalignment problems, and problems caused by the casing. The discussion is based on the authors’ experiences at the six-unit, 1,890-MW Ramin Power Plant, located in Ahwaz, Iran. The units were commissioned from 1980 through 1985.
Answer:
a might
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