为确保大型火电机组在深度调峰条件下安全、经济地运行，以某1000MW机组深度调峰运行为例，采用ANSYS软件对深度调峰运行时高、中压转子的温度场、应力场和寿命损耗进行数值模拟计算，并对比分析降低变负荷率和提高主、再热蒸汽最低温度两种方案的应力幅值变化。结果表明：在转子结构不变的情况下降低变负荷率和提高主、再热蒸汽最低温度均可降低转子应力幅值。其中，降低变负荷率的效果相对较弱，并且会限制机组的灵活性；而在保持负荷变化率不变的前提下，提高主、再热蒸汽最低温度效果明显，提高主、再热蒸汽的最低温度20℃可使转子峰值应力降低64.72MPa。

To ensure the safe and economical operation of large thermal power units under deep load regulation conditions, we take a 1000 MW unit as a case study. Using ANSYS software, we perform numerical simulations of the temperature field, stress field, and lifespan degradation of the high-pressure and intermediate-pressure rotors under deep load regulation conditions. We then analyze the changes in stress amplitude for two scenarios: reducing the load variation rate and increasing the minimum temperatures of the main and reheating steam. The results indicate that both strategies—reducing the load variation rate and increasing the minimum temperatures of the main and reheating steam—can effectively reduce the rotor stress amplitude, assuming the rotor structure remains unchanged. However, the impact of reducing the load variation rate is relatively limited and may constrain the unit's operational flexibility. In contrast, maintaining a constant load variation rate while increasing the minimum temperatures of the main and reheating steam yields significant benefits. Specifically, raising the minimum temperatures by 20°C can reduce the peak stress in the rotor by 64.72 MPa.

河北省研究生创新基金项目(CXZZBS2025183)