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本研究针对超临界大功率机组参与电网一次调频对汽轮机寿命损耗的影响进行了研究,建立了不同运行工况下的汽轮机转子疲劳寿命的有限元模型,对超临界机组参与电网一次调频时转子的暂态温度场和弹塑性应力场进行了计算分析,确定了不同变负荷速率和温升速率下、定压与滑压运行工况时汽轮机寿命的损耗。结果表明:负荷变化范围为10%时,危险位置轴表面的最大应力为82.18 MPa,应力变化值为69.18 MPa,轴心处的最大应力小于20 MPa,应力变化值小于17 MPa,应力水平很低,热应力也很小。一次调频对高中压缸各级温度变化以及热应力影响很小,对机组寿命的影响可以忽略,机组可以安全的参与电网的一次调频。
In this paper, the influence of the supercritical power unit on the life loss of the turbine is studied, and the finite element model of the rotor fatigue life under different operating conditions is established. The finite element model of the rotor of the supercritical power unit under the condition of primary frequency modulation Transient temperature field and elasto-plastic stress field are calculated and analyzed, and the loss of turbine life under constant load and slip load operating conditions is determined under different load rates and temperature rise rates. The results show that the maximum stress of shaft surface at dangerous position is 82.18 MPa, the stress is 69.18 MPa, the maximum stress of shaft center is less than 20 MPa, the stress variation is less than 17 MPa and the stress level is very low , Thermal stress is also small. A frequency modulation on the high pressure cylinder temperature changes at all levels and thermal stress is small, the impact on the life of the unit can be ignored, the unit can safely participate in a frequency modulation of the power grid.