With the development trend of large-scale air separation plant, the column support of its matching cold box equipment tends to be large-scale. The traditional support structure has complex structure and poor bearing capacity. Through the use of finite element analysis software, DEAR air separation carries out finite element analysis and optimization on the commonly used experienced column of air separation plant, so as to improve the bearing capacity of support and reduce the processing difficulty, to reach the purpose of saving material cost.
The column support of air separation plant is mainly used to support the column body in the cold box. The commonly used column structure is mainly composed of ring plate, rib plate, vertical pipe and connecting straight pipe. All components of the support are made of 0Cr19Ni10.
Through the finite element analysis of the traditional solid model, and through the correct application of load and boundary conditions, considering the low height of column support, and without considering the influence of wind load, earthquake load and snow load, the load mainly includes the weight of support and the weight of column and its accessories. Therefore, only the symmetry constraint is added on the symmetry plane to constrain its displacement degree of freedom along the normal direction of the symmetry plane, and the full constraint is added to the bottom surface to constrain its degrees of freedom in the three directions of X, Y and Z.
The specific optimization scheme is as follows: considering that the rib plate hardly plays a supporting role, all the rib plates between the two ring plates are removed; a straight pipe connecting the vertical pipe is removed and replaced by two inclined pipes, and the annular plate is supported obliquely upward to reduce the angle between the ring plate and the two vertical pipes.
Through the strength check, the bearing capacity of the optimized structure is increased by 3 times, and the structure is simpler, the processing is more convenient, and the production cost is reduced.
