超临界机组参与一次调频对汽轮机寿命影响的研究  被引量:7

Study of the Influence of the Participation of a Supercritical Unit in the Primary Frequency Modulation on the Service Life of a Steam Turbine

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作  者:王旭荣[1] 李福尚[2] 张亚夫[3] 戴义平[1] 

机构地区:[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]山东电力研究院,山东济南250000 [3]西安热工研究院有限公司,陕西西安710032

出  处:《热能动力工程》2014年第4期367-373,456-457,共7页Journal of Engineering for Thermal Energy and Power

摘  要: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。The authors have conducted a study of the influence of the participation of a supercritical high power unit in the primary frequency modulation of the power grid on the loss in service life of the steam turbine,established a finite element model for the fatigue life of the rotor of the turbine under various operating conditions and calculated and analyzed the transient temperature field and elastic and plastic stress field of the rotor when the unit was taking part in the primary frequency modulation of the power grid. It has been found that when the load changes in a range of10%,the maximum stress on the surface of the shaft at the dangerous location is 82. 18 MPa,the variation value of the stress is 69. 18 MPa,the maximum stress at the center of the shaft is less than 20 MPa and the variation value of the stress is less than 17 MPa,showing that the stress is very low and the thermal stress is also very small. The primary frequency modulation has a small influence on the temperature variation at all stages in HP and MP cylinder and the thermal stress and the influence on the service life of the unit can be neglected,thus the unit is capable of safely taking part in the primary frequency modulation of the power grid.

关 键 词:超临界机组 一次调频 温度场 应力场 汽轮机寿命 

分 类 号:TK284[动力工程及工程热物理—动力机械及工程]

 

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