The Buckling Stability Analysis And Optimal Design Of Desulfurization Absorber Tower With Large Rectangular Hole

In this paper, the stability of desulfurization absorber tower with large rectangular hole is systematically studied by means of numerical analysis methods (ANSYS software). Some reinforcement methods of the rectangular-hole boundary are proposed and a series of optimization results are obtained. All of these results can provide theoretical basis for further structural design and optimization of the desulfurization absorber tower in large-scale thermal power plant. The main research methods and conclusions are drawn as follows:Firstly, eigenvalue buckling is analysised so as to forecast the critical buckling load and buckling mode of the absorber tower, which can provide foundation for further nonlinear buckling analysis. Results reveal that the critical buckling load of absorber tower with large rectangular hole is much smaller than the value of the perfect absorber tower due to the large hole effects, so the rectangular hole can seriously undermine the stability of absorber tower.Secondly, the real load-displacement response of the buckling absorber tower is obtained by geometrical nonlinear analysis. The effects of different geometric parameters, including the opening width; the opening height; the opening center height; radius-thickness ratio and taper angle, are studied by separate and orthogonal combination buckling analysis respectively. It is found that the radius-thickness ratio has the greatest influence on the structure buckling load, i.e. the buckling load decreases exponentially with the increase of radius-thickness ratio. Next comes the width of opening, while the buckling load increases linearly while the opening width decreases. However the opening height, opening center height and taper angle have little impacts on the structural buckling load.Thirdly, analysis is carried out about the effects of different types and positions of reinforcement on the stability of the absorber tower after reinforcing the rectangular hole boundary in different positions. The cross section shape of the stiffener is determined by comparing the different buckling load of the absorber tower. Then optimize the geometry parameters and the position of the stiffener, and obtain a series of optimization models and reinforcement positions of the stiffener.Fourthly, to further reinforce the absorber, the completely-stiffened plate reinforcement method is conducted on basis of the opening-hole reinforcement. The stiffened plates improve the stiffness of the open-hole boundary effectively, and further alleviate the stress concentration on the opening point. As a result, the stress and deformation distribution is more uniform, and the stability of the absorber tower body is further improved.Finally, according to the optimization results in this paper, some optimization suggestions are carried out on a 2 × 660 MW wet FGD desulfurization absorber tower in the Zhejiang Wenzhou power plant of phase Ⅳ. Results show that such optimization can reduce the steel weight of the tower body effectively without decreasing security. Because there is no specialized design specification for desulfurization absorber tower in china, some optimization conclusions in this paper can provide significant guidance for the design and optimization of desulfurization absorber tower.