摘要
凝汽器是热电站的主要辅机设备之一,其管板的结构和受力都非常复杂。为了准确分析端部载荷对管板强度的影响,根据凝汽器结构特点,改进了梁带计算力学模型。根据管板受力情况,计算分析得到梁带模型端部载荷(端部力和端部弯矩)的表达式,然后分别通过Heat Exchange Institute(HEI)标准和根据圆弧性水室的特点及凝汽器结构特点求解出端部载荷,再利用矩阵位移法求解出管板梁带受力情况,最后通过某电站实例来验证端部载荷算法的正确性。结果表明:方法能正确计算梁带模型端部载荷,为管板的强度设计提供了一套解决端部载荷的方法,具有工程实际意义。
Condenser is one of the main auxiliary equipment of thermal power station. The structures and loads of tube-sheets are complex. In this paper, an improved beam-strip model was built according to the structure traits of the condenser in order to assess the effect of the end load acting on the tube-sheets strength accurately. The expressions of end loads （ end moments and end force） were obtained by calculation and analyses. The tube-sheet end moments and end forces were calculated based on Heat Exchange Institute （HEI） criterion and arc-shaped water chamber feature as well as structure of condenser. The matrix displacement method was used to calculate force distribution of beam-strip. Compared the results with two thermal power station cases which verified the validity of the calculation of end forces, the results show that this method can calculate the end forces of beam-strip correctly, which provided a method to calculate the end loads for tube-sheet strength design and can be used in engineering practice.
出处
《机械强度》
CAS
CSCD
北大核心
2014年第4期550-554,共5页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51379179)
流体及动力机械教育部重点实验室(西华大学)项目(SBZDPY-11-7)
西华大学研究生创新基金项目(ycjj2014180)资助~~
关键词
凝汽器
管板
端部力
端部弯矩
梁带模型
Condenser
Tube-sheet
End force
End moments
Beam-strip model
