【摘要】 珠海发电厂第一期 1号、 2号机组采用日本三菱 70 0MW凝汽式汽轮机 ,借助于先进的监控系统和管理经验 ,在不增加机组的寿命损耗的前提下 ,可明显地缩短启动时间。鉴此 ,介绍了机组的启动特性 ,结合某次实际冷态启动过程 ,利用有限元方法校核计算了高中压转子热应力 ,其中有限元模型的边界上的换热系数综合使用了各国普遍推荐的经验公式 ,形成灰色区间曲线更多还原

【Abstract】 Along with the great capacity units with high valued parameters diving into electric power production, a Mitsubishi 700 MW unit, designed for high operating efficiency and maximum reliability, has been installed in Zhuhai Power Station. The rational and optimal start up procedure of the turbine makes the least need of time for a cold start up with the least life consuming. Aiming at thermal stresses of the high and intermediate pressure (HP IP)rotor, the start up procedure of this unit is introduced. A new conception called gray boundary, concerning the conflict between each experiential formulas of heat transfer coefficient, is presented to obtain the temperature filed and the thermal stress field using finite element method (FEM). It is obvious that the interval value can express the thermal stress in a much better way.更多还原