Finite Element Model Theoretical Analysis Of Dry Type Gasholder Sealed With Rubberized Fabric

With the development of industry, dry gasholder is commonly used in gas storage in our country, especially in mid-high pressure holder. At present, the study on mid-high pressures gas storage is almost blank in our country. Due to the shortage of the perfect design codes, designers often use simplified calculation method, which make the design of dry gasholder iffy. Therefore, a thorough calculation and analysis of the mid-high pressure dry gasholder, which can provide theoretical basis for engineering, is of great theoretical value and practical significance.At the beginning of this paper, detailed static, stability analysis for the container is carried out by using the Theory of Thin Shell and the common FEA software ANSYS. The results are analyzed and compared. According to these results, the cross sections of the components are adjusted, which make the design optimal. The seismic and dynamic analyses are also applied to the holder. It is found that the stress and deformation of the dry gasholder is relatively small under common earthquake excitation, so it cannot control the computation.Afterwards, the static analysis work for the enclosure of the piston is carried out, and the stress and deformation results based on different calculation models are compared and analyzed. Some conclusions are given that the results based on the simplified calculation models of the piston enclosure are quite different from those based on the whole calculation model. In the mean time, the eigenvalue buckling and nonlinear buckling analysis of the piston enclosures are carried out in this dissertation. The critical load and the buckling modality of the piston enclosure are studied on the basis of different ingredient and various initial defects. Studies show that the value of critical load of piston in gasholder is lower when considering geometric nonlinearity and material nonlinearity. Along with growth of the gradient of piston, the value of critical load didn't reduce obviously, but the deformation of structure becomes more apparent.