Researches On The Practical Method Of Non-linear Seismic Response Analysis For Desulfurization Tower Structure

Because of the compulsive requirement about the national environmental protection, a series of strict control measures have been adopted by the government to the emissions of harmful air, for example sulfur dioxide, of the coal-fired power plant since the end of last century. As the core equipment of flue gas desulfurization in the coal-fired power plant, the smoking desulfuration absorber tower has large diameter, thin thickness and large rectangular opening. Up to now, there is no uniform design method of the equipment. The structure and load form of the absorbing tower are complex, with the result that the regular design and calculation method cannot give its distributions for the stress and deformation. Hence, today's numerical analysis code becomes one of the indispensable tools for researchers and designers on the fact that it can reduce designing cost and save calculating time efficiently. Up till now, the large-scale finite element analysis code "ANSYS" has become a powerful tool in the numerical calculations and structure designs.Based on the researches and achievements available in the literature, a nonlinear FEM model involving geometrical large deformation and materials nonlinear is presented. FEM analysis software ANSYS is used to analyze its seismic performance, including the establishment of FEM model, the analysis of the structural dynamic characteristics and the calculation of deformation and internal force on the basis of time-history analysis method for the tower structure. The Von. Mises failure condition and bilinear kinematical hardening stress-strain relationships have been used in the analysis for the steel material. Meanwhile, a criterion provided by ANSYS is used to study the elastic-plastic seismic performance of the tower. The calculations illustrate that there are only a minor parts of the structure with high stress concentration is entered into plastic state under violence earthquake. Hence, the entire structure is safety.According to the results of this paper, some construction suggestions are presented for the reference of future research and structure design.