汽轮机启动、停机及变负荷过程中的热应力水平,是影响机组在有效服役期限最重要的因素。控制不同的热应力变化过程,可获得不同的暂态效应。蒸汽温度变化率是运行中唯一可控的因素。从热应力角度考虑,适当地控制蒸汽温度率,可使机组在允许的寿命损耗下实现最佳的暂态过程。 Turbine start-up, shutdown and variable load in the process of thermal stress level is the most important factor affecting the effective duration of the crew. Control of different thermal stress changes can obtain different transient effects. The rate of change of steam temperature is the only controllable factor in operation. From the thermal stress point of view, proper control of the steam temperature rate allows the unit to achieve the optimal transient process under the allowable lifetime loss.