2. Thermal Problems in Quick Start and Rapid Load Increase of Marine steal Turbines steal Turbines

概要

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Some series of tests of quick start and rapid load increase were carried out on naval steam turbines and boilers in their sea trials to improve their operational flexibilities. In the tests, the turbines were acceralated from 12 Knots speed to the maximum speed within from 25 to 14 minutes, while the boilers were started up to their working pressure in from 100 to 50 minutes. Thermal stresses at the horizontal flanges and the flange bolts of the turbine casings, relative expansion between the rotors and the casings were mainly measured on the turbines, and the superheater tube wall temperature distortion of the water drum and the stress caused by the distortion on the boilers. In this paper, the results of the tests and the consideration of the authors derived from them are mentioned, including the method to minimize the thermal stress in turbine casings and the similarity of the thermal stress when the scale is changed.
社団法人日本船舶海洋工学会の論文