Determination of the Optimal Temperature Rise Rate for Hot Start of a 660MW Steam Turbine Unit
To further shorten the hot start time of thermal power unit and meet the requirements of rapid start to participate in the peak regulation of power grid.Based on the thermal start of a 660MW steam turbine set as an example,in this paper,the developed program is used to determine the steam parameters and heat transfer coefficient of the rotor surface at different start-p stages.Subsequently,ANSYS software is used to numerically simulate the temperature and stress fields of the rotor during hot start of the steam turbine.The variation pattern of the thermal stress in the key monitoring parts of the steam turbine rotor is analyzed.Besides,the loss of low cycle fatigue life of steam turbine rotor is analyzed from different temperature rise rates,and the optimal temperature rise rate for hot start of the unit is obtained.From the results,the hot starting time of the steam turbine unit can be shortened by 18％compared with the design condition.The work done has certain reference value for the deep peak regulation of large thermal power units.
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