CO2 spherical tank is a spherical storage tank shell with uniform force. Under the same diameter and the same working conditions, the film stress of spherical container is only half of the annular stress of cylindrical container with the same thickness, and the corresponding bearing capacity is strong. In addition, under the same volume, the spherical shell has the smallest surface area and light weight. However, due to the large volume of the spherical storage tank, it is difficult to manufacture and install the spherical shell plate, which needs to be formed by the manufacturer and assembled and welded by the installation unit on site. The technical requirements are relatively high.
When there is a fire in the tank area, in order to prevent the pillar of the spherical tank from being burned down in a very short time, causing the damage of the spherical tank and making the accident worse, in addition to the use of fireproof water spray for the tank body, for the pillar of the height of LM, with a thickness of 50m or more heat-resistant concrete or non-flammable insulation material with comparable performance.
Components
The ladder and platform structure of the spherical tank is often based on the site layout and process operation requirements of the number of spherical tanks. There are different types of construction.
Large spherical tank, generally use a separate ladder for each spherical tank, the ladder structure is divided into; The upper winding ladder and the lower inclined ladder two parts. Because approximate dry spherical image linear ladder has the following characteristics; From the equator transfer platform can always be connected to the round platform at the top of the container, there is no need to increase the transfer platform in the middle, the travel is short and comfortable, there is no feeling of steep rise and fall; Less steel consumption; The ladder is always the same distance from the sphere. In this way, the ladder is not only consistent with the spherical curvature, beautiful and generous, but also conducive to the construction of insulation engineering.
Foundations
The requirement for foundation of carbon dioxide spherical tank is that under the condition of uneven subsidence of 1mm, one pillar will produce stress about 10% higher than other pillars. Suppose that when designing the prop, the safety factor is 1.7. In the case of uneven subsidence of 7mm, the bearing capacity of the prop will be exhausted, resulting in axial bending. In order to sink as evenly as possible. The foundation shall be designed as a torsion-resistant ring foundation. In addition, it is necessary to use a ring foundation for the spherical tank located in the seismic zone.
Based on the spherical tank welding after the overall heat treatment, the spherical tank foundation should be reserved hole structure, should not be embedded anchor bolts. Because in the process of heating and cooling, the pillar of the spherical tank will be displaced with the thermal expansion and contraction of the shell. The head of the anchor bolt exposed on the foundation surface will hinder the displacement of the pillar, and the structure of the reserved hole is also conducive to the necessary adjustment of the position of the pillar in the installation process to ensure the installation quality of the spherical tank.