Calculation requirements for internal pressure strength of container shell
Calculate the thickness according to the calculation formula of the internal pressure cylinder wall thickness of GB150-1998, and then consider the corrosion allowance and manufacturing negative deviation to take the minimum thickness. Considering the high tower equipment, in addition to the pressure, its load also includes weight load, static liquid load, wind load, earthquake load, etc., and the dangerous combination of these loads is often the main reason for the instability and damage of the tower equipment, so it must be carried out. Rigidity design, after calculation and checking, take the thickness that meets the requirements.
About the vibration problem
Generally, the ratio of height to diameter of a supercritical CO2 rectification tower is relatively large, so it should be regarded as a flexible structure. In this case, the influence of high vibration mode on the equipment should be considered.
High-vibration calculation method JB/T4710-2005 “Steel Tower Container” Appendix A “Calculation of Wind Force and Wind Bending Moment of Cross Wind”. The disadvantage of this method is that the acceleration response spectrum curve is used to obtain the maximum value of each mode response when calculating each mode response, but in fact, the maximum value of each mode response does not occur at the same time, so the calculation result is too large. In addition, the calculation of this method is relatively complicated, so the “Tower” stipulates that when the H/D of the supercritical CO2 rectification tower is > 15 or H < 20m, the seismic bending moment of the basic mode can be increased by 1.25 times.
Read more: Supercritical carbon dioxide