脱硫吸收塔矩形大开孔屈曲失稳分析及补强优化
发布时间：2019-06-09 19:24
【摘要】：本论文以脱硫吸收塔矩形在升孔为研究对象,利用数值计算方法,借助ANSYS软件系统研究了脱硫吸收塔的稳定性,并对矩形开孔的上下边界和纵边界进行补强筋优化补强,得到了一系列优化结果,为大型火电厂湿法脱硫系统吸收塔的结构设计及补强优化提供了一定的可参考理论依据。主要研究内容和结论如下：(1)通过特征值屈曲分析预测吸收塔屈曲载荷的上限值,了解其屈曲形状,为后面的非线性屈曲分析做基础。通过特征值屈曲分析了解到,由于矩形孔洞的存在,其临界屈曲载荷值远远小于无开孔塔体屈曲载荷下限值,矩形开孔严重削弱了塔体的稳定性。(2)对脱硫吸收塔进行考虑几何大变形的非线性屈曲分析,得到更接近于实际情况的结构载荷位移响应图。通过对影响吸收塔稳定性的各参数进行单独的屈曲分析和正交组合屈曲分析,得到了矩形开孔宽度,开孔高度,开孔中心高度,径厚比以及变径角度对吸收塔稳定性的影响,并对各因素影响因子进行排序。径厚比对结构的屈曲载荷值影响最大,几乎是随着径厚比增大而呈几何级的递减；其次是矩形开孔宽度,屈曲载荷值随着开孔宽度减小而线性递增；开孔高度,开孔中心高度以及变径角对结构屈曲载荷值影响不太大。(3)对矩形开孔上下边界和纵边界进行补强筋补强,分析各种型号的补强筋以及补强位置对吸收塔稳定性的影响。通过比较不同截面形状的补强筋下屈曲载荷值大小,确定补强筋的截面形状,然后再对该截面形状的补强筋进行型号参数优化和补强位置优化,得到一系列优化的补强筋型号和补强位置。(4)在矩形开孔周边进行补强筋补强的基础上对开孔边界进行完全加筋板补强。加筋板设置使孔边界刚度得到进一步的加强,有效缓解了开孔角点处的应力集中,应力分布和变形更加均匀,塔体的稳定性得到进一步提高。最后,根据本文的一些优化结果,对浙能温州电厂四期2×660MW机组湿法脱硫工程吸收塔进行优化建议,在保证安全的前提下,减少了塔体的结构用钢量。鉴于目前国内没有专门的脱硫塔设计规范,本文中的一些优化结论对于脱硫塔的设计及优化具有一定的指导意义。
[Abstract]:In this paper, the stability of desulphurization absorption tower is studied by using numerical calculation method and ANSYS software system, and the upper and lower boundary and longitudinal boundary of rectangular hole are optimized and strengthened. A series of optimization results are obtained, which provide a certain reference theoretical basis for the structure design and reinforcement optimization of the absorption tower of wet desulphurization system in large thermal power plants. The main research contents and conclusions are as follows: (1) the upper limit value of the buckling load of the absorption tower is predicted by eigenvalue buckling analysis, and its buckling shape is known, which is the basis for the later nonlinear buckling analysis. Through the eigenvalue buckling analysis, it is found that the critical buckling load is much lower than the lower limit of the buckling load of the tower without opening due to the existence of rectangular holes. The stability of the tower is seriously weakened by the rectangular hole. (2) the nonlinear buckling analysis of the desulphurization absorption tower considering the geometric deformation is carried out, and the structural load displacement response diagram which is closer to the actual situation is obtained. The effects of rectangular hole width, hole height, hole center height, diameter to thickness ratio and variable diameter angle on the stability of absorption tower are obtained by means of individual buckling analysis and orthogonal combined buckling analysis of each parameter affecting the stability of absorption tower. The influencing factors of each factor were sorted. The ratio of diameter to thickness has the greatest influence on the buckling load of the structure, almost decreasing with the increase of the ratio of diameter to thickness, followed by the width of rectangular hole, and the value of flexion load increases linearly with the decrease of opening width. The height of the hole, the height of the center of the hole and the angle of variable diameter have little effect on the buckling load of the structure. (3) the upper and lower boundary and longitudinal boundary of the rectangular hole are reinforced by reinforcement. The effects of various types of reinforcement and reinforcement position on the stability of absorption tower are analyzed. By comparing the flexion load under the reinforcement with different section shapes, the section shape of the reinforcement is determined, and then the model parameters and reinforcement position of the reinforcement are optimized. A series of optimized reinforcement types and reinforcement positions are obtained. (4) based on the reinforcement around the rectangular hole, the fully stiffened plate is strengthened. The stiffness of the hole boundary is further strengthened by the installation of the stiffened plate, which effectively relieves the stress concentration at the opening corner, the stress distribution and deformation are more uniform, and the stability of the tower is further improved. Finally, according to some optimization results of this paper, the absorption tower of wet desulphurization project of 2 脳 660MW unit in Phase IV of Zhejiang Wenzhou Power Plant is optimized, which reduces the amount of steel used in the structure of the tower under the premise of ensuring safety. In view of the fact that there is no special design code for desulphurization tower in China, some optimization conclusions in this paper have certain guiding significance for the design and optimization of desulphurization tower.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU347;X773
[Abstract]:In this paper, the stability of desulphurization absorption tower is studied by using numerical calculation method and ANSYS software system, and the upper and lower boundary and longitudinal boundary of rectangular hole are optimized and strengthened. A series of optimization results are obtained, which provide a certain reference theoretical basis for the structure design and reinforcement optimization of the absorption tower of wet desulphurization system in large thermal power plants. The main research contents and conclusions are as follows: (1) the upper limit value of the buckling load of the absorption tower is predicted by eigenvalue buckling analysis, and its buckling shape is known, which is the basis for the later nonlinear buckling analysis. Through the eigenvalue buckling analysis, it is found that the critical buckling load is much lower than the lower limit of the buckling load of the tower without opening due to the existence of rectangular holes. The stability of the tower is seriously weakened by the rectangular hole. (2) the nonlinear buckling analysis of the desulphurization absorption tower considering the geometric deformation is carried out, and the structural load displacement response diagram which is closer to the actual situation is obtained. The effects of rectangular hole width, hole height, hole center height, diameter to thickness ratio and variable diameter angle on the stability of absorption tower are obtained by means of individual buckling analysis and orthogonal combined buckling analysis of each parameter affecting the stability of absorption tower. The influencing factors of each factor were sorted. The ratio of diameter to thickness has the greatest influence on the buckling load of the structure, almost decreasing with the increase of the ratio of diameter to thickness, followed by the width of rectangular hole, and the value of flexion load increases linearly with the decrease of opening width. The height of the hole, the height of the center of the hole and the angle of variable diameter have little effect on the buckling load of the structure. (3) the upper and lower boundary and longitudinal boundary of the rectangular hole are reinforced by reinforcement. The effects of various types of reinforcement and reinforcement position on the stability of absorption tower are analyzed. By comparing the flexion load under the reinforcement with different section shapes, the section shape of the reinforcement is determined, and then the model parameters and reinforcement position of the reinforcement are optimized. A series of optimized reinforcement types and reinforcement positions are obtained. (4) based on the reinforcement around the rectangular hole, the fully stiffened plate is strengthened. The stiffness of the hole boundary is further strengthened by the installation of the stiffened plate, which effectively relieves the stress concentration at the opening corner, the stress distribution and deformation are more uniform, and the stability of the tower is further improved. Finally, according to some optimization results of this paper, the absorption tower of wet desulphurization project of 2 脳 660MW unit in Phase IV of Zhejiang Wenzhou Power Plant is optimized, which reduces the amount of steel used in the structure of the tower under the premise of ensuring safety. In view of the fact that there is no special design code for desulphurization tower in China, some optimization conclusions in this paper have certain guiding significance for the design and optimization of desulphurization tower.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU347;X773
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