300MW火电厂空冷系统排汽管道抗震分析
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摘要
基于Ansys有限元软件,建立了300MW空冷系统排气管道的有限元模型。通过模态分析,计算了排气管道的动态特性,得到了排气管道的固有频率、振型,表明主要影响地震响应的振型是平动振型,而扭转振型影响较小。应用反应谱法计算了排气管道的地震响应,并用SRSS法对地震荷载组合后再与重力荷载进行组合。计算结果表明,在地震荷载和重力荷载作用下,排气管道整体应力水平很低,其强度满足规范要求。
Based on ANSYS software,the finite element model of exhaust pipe of 300 MW air-cooled power plant was set up,the structural dynamic characteristics of the pipe were analyzed by modal method.The natural frequencies and vibration modes of the pipe were obtained and it is shown that horizontals sway mode shape influences structural dynamic response dominantly and the effect of the torsional mode shape is not obvious.The earthquake response of the pipe was calculated by response spectrum method,and the seismic responses of different mode shaps loads were combined by SRSS method and after that it was combined with gravity load again.The results show that the overall stress level of the exhaust pipe under seismic and gravity loads are very low and its strength may satisfy demand of corresponding specification.
Based on ANSYS software,the finite element model of exhaust pipe of 300 MW air-cooled power plant was set up,the structural dynamic characteristics of the pipe were analyzed by modal method.The natural frequencies and vibration modes of the pipe were obtained and it is shown that horizontals sway mode shape influences structural dynamic response dominantly and the effect of the torsional mode shape is not obvious.The earthquake response of the pipe was calculated by response spectrum method,and the seismic responses of different mode shaps loads were combined by SRSS method and after that it was combined with gravity load again.The results show that the overall stress level of the exhaust pipe under seismic and gravity loads are very low and its strength may satisfy demand of corresponding specification.
引文
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[2]杨立军,杜小泽,杨勇平.风机群分区调节对空冷岛传热特性的影响[J].工程热物理学报,2010,31(1):146-148.YANG Lijun,DU Xiaoze,YANG Yongping.Influences of divisional regulation of axial flow fans upon heat transfer performance of irect air-cooledsystem[J].Journal of Engineering Hermophysics,2010,31(1):146-148.
[3]杨立军,杜小泽,杨勇平.环境风影响下的空冷岛运行特性[J].工程热物理学报,2009,30(2):325-328.YANG Lijun,DU Xiaoze,YANG Yongping.Influences of natural wind upon the operation characteristics of air-cooled condenser system[J].Journal of Engineering Thermophysics,2009,30(2):325-328.
[4]杨立军,贾宝荣,杜小泽等.内部导流对空冷单元流动传热特性的影响[J].工程热物理学报,2009,30(7):1226-1228.YANG Lijun,JIA Baorong,DU Xiaoze.Influence of internal flow guiding device upon flow and heat transfer characteristics in air-cooled condens-er cell[J].Journal of Engineering Thermophysics,2009,30(7):1226-1228.
[5]赵万里,刘沛清.发电厂直接空冷系统空冷岛热态流场特性分析[J].应用基础与工程科学学报,2009,17(4):605-613ZHAO Wanli,LIU Peiqing.Experimental investigation on thermal flow field characteristics of a direct air-cooled system for a large power plant[J].Journal of Basic Science and Engineering,,2009,17(4):605-613
[6]JB4732-1995钢制压力容器——分析设计标准[S].JB4732-1995 Stress Analysis Design Standard of Steel Pressure Vessel[S].
[7]吴小峰,孙启国.特高压悬吊换流阀塔抗震分析[J].世界地震工程,2011,27(2):207-210.WU Xiaofeng,SUN Qiguo.Seismic analysis of an UHV suspended converter valve tower[J].World Earthquake EngineerIng,2011,27(2):207-210.
[8]GB50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Buildings[S].
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