某电厂1000 MW汽机基础动力参数优化设计研究

Study on Optimization Design of the Foundation Power Parameters of the 1000 MWSteam Engine in a Power Plant

以某电厂2×1000 MW汽轮发电机组为工程背景,开展汽机基础动力参数优化设计研究。针对汽机转子动力响应过大而不利于汽机正常工作的问题,采用ANSYS软件建立汽机基础结构整体有限元模型,依次开展汽机基础动力特性和强迫振动响应分析,分别讨论增加短柱、短柱宽度和L型梁高度对汽机基础动力响应产生的影响。结果表明:在汽机基础有限元建模中可采用增加附加质量及刚域的方式模拟转子和静子的刚度、质量贡献;分别增设梁间短柱和增加横梁高度,能够有效降低转子动力响应;研究结果可为汽机基础精细化建模与降低汽机转子振动响应提供参考。

With a power plant with 2×1000 MW turbine generator unit as the engineering background,the optimal de-sign of dynamic parameters of the steam engine foundation was carried out.Aiming at the problem that the dynamic re-sponse of the turbine rotor is too large for the normal operation of the turbine,ANSYS software was used to build the finite element model of the whole turbine foundation structure.And the dynamic characteristics and forced vibration response of the turbine foundation were analyzed,and the effects of increasing the short column,short column width and L-beam height on the dynamic response of the turbine foundation were discussed.The results show that in the finite element modeling of steam engine foundation,the stiffness and mass contribution of the rotor and stator can be simulated by increasing the addi-tional mass and stiffness domain.Adding short columns between beams and increasing the height of beams respectively can effectively reduce the rotor dynamic response.The research results have provided a reference for the refined modeling of steam engine foundation and reducing the vibration response of the steam engine rotor.