某电厂除尘器圈梁变形加固前后的有限元分析-2017年10月.docVIP

某电厂除尘器圈梁变形加固前后的有限元分析 张天助 金立赞 姜迎秋 （中冶集团建筑研究总院华东分院 / 上海 200940） 摘要：某电厂Y296—Ivx2型电除尘器积灰超载，造成积灰斗承载圈梁主梁严重变形损坏，并采用体外预应力桁架加固。利用大型通用有限元分析软件ANSYS8.1，对该除尘器灰斗系统结构加固前后进行计算分析，研究结构在积灰荷载作用下的受力变形状况。计算分析结果表明，加固前有限元变形计算结果与电除尘器圈梁实际变形情况基本吻合，所建模型和采用的计算方法合理，分析计算具有较高的精度；预应力加固方案经济实用，大幅度的提高了电除尘器的承载能力，最大程度的消除了超载导致的变形。 关键词：电除尘器、圈梁、有限元、体外预应力桁架 Finite element analysis before and after deformation of ring beam of electrostatic precipitator had been reinforced in a power plant Zhang Tianzhu Jin Lizan Jiang Yingqiu (East China Branch of Central Research Institute of Building and Construction，MCC Group Shanghai 200940) ABSTRACT An severe overloading on Y296—Ivx2 type electrostatic precipitator caused serious deformation and damage to a main steel beam ,An external prestress truss for reinforcement is applied, calculation and analysis to strcture of electrostatic precipitator is done by large-scale finite element analysis software-ansys8.1,at the same time ,force and deformation of strcture is studied under load ,the result of calculation and analysis indicates that the calculated result of deformation is basically in accord with actual deformation of ring beam . not only created model and calculated method is all reasonable ，but also accuracy of analysis and calculation is much high . the reinforced solution of prestress truss is economical and practical, greatly increasing the carrying capacity of electrostatic precipitator, to the greatest extent, eliminating the deformation caused by overloading. KEY WORDS electrostatic precipitator ring beam finite element external prestress truss 随着《京都议定书》的生效,以及我国对治理烟气污染排放力度的加大, 电除尘器以其除尘效率高、运行管理方便、故障率低和适应性强等优点在工业领域烟气治理中得到了广泛的应用，特别是在燃煤发电领域，近几年新建电厂几乎均采用电除尘系统进行烟气处理，且随着发电机组的规模增大，除尘器的规模也在不断的增大。但是我国除尘器钢结构多由机械专业或除尘器制造厂家设计。由于缺少相关规范标准，目前的除尘器结构设计、制造、安装、运行管理等方面存在诸多隐患，据不完全统计，在近不足两年的时间内，仅在燃煤发电领域已经发生3-4起电除尘器塌落（损坏）事故。 一、工程概况 某电厂Y296—Ivx2型1号除尘器建于2004年，为钢结构构筑物，采用钻孔灌注桩基础，钢管柱，槽钢-钢板组合箱型主梁；钢集灰斗。平面及剖面见图1。试运行期间，发生集灰斗严重超载，造成除尘器结构损坏，出现主梁严重挠曲变形、梁腹板屈曲，灰斗板翘曲等现象。事故发生后，施工方曾提出