Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition(无全文)

作者:Jie GUO;Danmei XIE;Hengliang ZHANG;Wei JIANG;Yan ZHOU 刊名:能源前沿:英文版 上传者:

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【摘要】The precise calculation of temperature and thermal stress field of steam turbine rotor under off-design conditions is of paramount significance for safe and economic operation, in which an accurate calculation of heat transfer (HT) coefficient plays a decisive role. HT coefficient changes dramatically along with working conditions. First, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conducted to investigate the temperature and thermal stress difference along with the change of HT coefficient from 20 W/(m2. ~C) to 20000 W/(m2. ~C). Next, the differentia- tion between existing empirical formulas has been analyzed from the aspect of physical significance of non- dimension parameters. Finally, a verifying case of the cold startup of a 1000MW unit has been proceeded. The result shows that the accuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor temperature and thermal stress, which means a precise empirical HT coefficient formula, like the Sarkar formula is strongly recommended. When steam parameters are high and HT coefficient is larger than 104 W/(m2.℃), there will be barely any influence on the calculation of thermal stress. This research plays a constructive role in the calculation and analysis of thermal stress.

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