The Thermal Stress of a Domestic 300MW Steam Turbo Unit during its Startup and Shutdown

Hai Tao Wang; Yun Chun Xia

doi:10.4028/www.scientific.net/AMM.275-277.87

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 275-277The Thermal Stress of a Domestic 300MW Steam Turbo...

The Thermal Stress of a Domestic 300MW Steam Turbo Unit during its Startup and Shutdown

Abstract:

The simulation system on the thermal stress of the rotor during startup & shutdown for a domestic 300MW steam turbo unit, by the simulation, the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shutdown. The max thermal stress & the max combined stress produced on the rotor of a medium pressure cylinder was about 16% bigger than those on the rotor of the high pressure cylinder when they had the same increase rate of temperature. When thought from economics & safety, the optimal temperature-increase-rate of the rotor was 1.6°C/min when the unit startup at cold state, but it was 1. 8°C/min when started up and shut down the unit at hot state, it’s optimal for slipping-parameter and the optimal temperature-decease-rate of the rotor was 0.85°C/min.

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Periodical:

Applied Mechanics and Materials (Volumes 275-277)

Pages:

87-93

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.275-277.87

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Online since:

January 2013

Authors:

Hai Tao Wang, Yun Chun Xia

Keywords:

Fatigue Life Loss, Rotor, Shutdown, Startup, Steam Turbo Unit, Thermal Stress

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