大容量锅炉大板梁沿长度方向拼接设计与分析

发布时间：2018-04-28 16:02

本文选题：大板梁 + 二叠梁拼接设计　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：大型锅炉具有提高能源利用效率、减少污染物排放的优势，更大容量、更高参数的锅炉成为目前火电发展的趋势。大板梁是锅炉钢结构中最重要的受力构件，，其承担悬吊于下方的数以万吨的炉体自重，并将荷载传递给锅炉构架。大板梁较大的尺寸及自重成为影响其运输和安装成本及效率的重要因素，且随着锅炉容量的日趋增大，这个问题变得更加重要。目前常用的办法是将大板梁分别沿高度和长度方向进行拼接，其中沿高度方向拼接已有较成熟的做法，而沿长度方向拼接的研究和工程应用较少。故本文以新疆九台农六师炉顶大板梁拼接工程项目为研究背景，以数值模拟为手段，针对大板梁沿长度方向拼接问题进行分析研究，主要开展了以下研究工作：（1）运用现有的规范手册以及相关的力学知识对四根通长的大板梁进行沿长度方向拼接的节点设计，给出拼接节点螺栓及板件的布置并进行相关验算。（2）运用有限元分析软件ANSYS完成大板梁沿长度方向拼接位置分析，分析比较大板梁在不同位置拼接时的力学性能，并结合工程实际给出相应结论。（3）运用有限元分析软件ANSYS，分析厚度公差、板件厚度等制造安装误差因素对大板梁拼接连接摩擦力损失的影响。（4）运用有限元分析软件ABAQUS对螺栓和钢板进行三维实体建模，对拼接连接节点进行局部分析，讨论螺栓间距、预紧力等因素对拼接螺栓受力以及应力分布的影响。
[Abstract]:Large boilers have the advantages of improving energy utilization efficiency, reducing pollutant emissions, larger capacity and higher parameters, which have become the trend of thermal power development at present. Large plate beam is the most important bearing member in boiler steel structure. It bears tens of thousands of tons of dead weight of furnace body suspended below and transfers the load to boiler frame. The larger size and deadweight of large plate beam become an important factor affecting the cost and efficiency of transportation and installation, and with the increasing capacity of boiler, this problem becomes more and more important. At present, the commonly used method is to splice large plate beams along the direction of height and length respectively, in which there is a more mature way of stitching along the direction of height, but the research and engineering application of splicing along the direction of length is less. Therefore, based on the research background of the large slab beam splicing project on the top of the furnace of the sixth division of Nong six division in Xinjiang, and by means of numerical simulation, this paper analyzes and studies the jointing problem of the large plate beam along the length direction, and mainly carries out the following research work: 1) the joint design along the length of four long plate beams is designed by using the existing specification manual and relevant mechanical knowledge, and the arrangement of joint bolts and plates is given and the relevant checking calculation is carried out. The finite element analysis software ANSYS is used to analyze the position of large plate beam splicing along the length direction, and the mechanical properties of the large plate beam are analyzed and compared in different positions, and the corresponding conclusions are given in combination with the engineering practice. 3) using finite element analysis software ANSYS, the influence of manufacturing and installation error factors, such as thickness tolerance and plate thickness, on friction loss of large plate beam splicing connection is analyzed. The finite element analysis software ABAQUS is used to model the bolt and steel plate, and the local analysis of joint joint is carried out. The effects of bolt spacing and pretightening force on the stress and stress distribution of bolt are discussed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK222;TU391

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