Numerical Simulation Of Dynamic Response Characteristics For The Tank Impacted By Explosion Fragment

With the rapid development of Chinese economy and society,safety and environmental requirements have become serious,the chemical industry park has become the mainstream model for the development of the chemical industry.While the chemical industry park brings huge economic benefits,it also brings about high security risks.Due to the relative concentration of equipment in the chemical park,once the container exploded,the explosion fragment often becomes one of the important factor for the domino explosion in the park.When a source target is failure,the thermal radiation,shock waves,fragments,etc.will often affect adjacent devices.Once the failure of adjacent devices causes chain reaction,the damage scale and economic losses will be larger than single device.Therefore,it is important engineering significance and theoretical value that the systematic research on the dynamic response characteristics of tank equipment when it is impacted by explosion fragment,providing a theoretical basis for its failure and risk assessment.This paper mainly uses the numerical simulation method to study the dynamic response characteristics of the spherical tank structure and the vertical storage tank head structure under the fragment impact.Firstly,the numerical simulation of the dynamic process of the spherical tank structure impacted by explosion fragment was carried out.The impact deformation process and rule of spherical tank structure under fragment impact are obtained(not penetrated).By changing the shape of the fragment,impact velocity,impact angle,rotation speed,quality and internal pressure of the tank,etc.The influence of the above factors on the deformation of the spherical tank structure is studied and analyzed.The simulation results showed that different types of explosion fragment impacted on the spherical tank will result in different impact effects.Under the same conditions,the cubic fragment will have the greatest impact deformation and the sphere fragment is the smallest.The pressure of the tank can improve the stability of the spherical tank during the impact of the fragment.Fragment impacting the tank with different incident angles will result in different impact effects.In the range of 0-60°,the impact displacement on the tank wall decreased with the increase of the incident angle.When the fragment takes the flight direction as the rotation axis,fragment rotation speed on impact displacement of the spherical tank shell wall is not obvious.When the penetration phenomenon occurs,the shape of the hole is closely related to the largest projection surface of the sphere fragment on the spherical tank,and the scope of the depression caused by the sphere fragment is the largest.With the increase of impact angle,the distance between the horizontal and vertical directions of the hole breaking increases gradually,but the distance between the vertical direction increases greatly.The study on the penetration energy of tanks with different wall thickness shows that the critical penetration energy of tanks has a good exponential relationship with wall thickness.Under the same conditions,the larger the wall thickness,the higher the critical penetration energy required.Secondly,considering the engineering fact that the possibility of vertical storage tank head impacted by fragments is larger,the dynamic process of the head of the vertical tank impacted by explosion fragment is studied by numerical simulation.The impact of the process and the inner diameter of the head,the ratio of the long axis to the short axis,and the impact location on the impact deformation is analyzed.The results show that under the same working conditions,the ratio of the long axis to the short axis of the head has a great influence on the resistance to fragment impact.The larger the ratio of the long axis to the short axis,the easier the fragment will penetrate the head.The change in the inner diameter of the head has a relatively small effect on the ability to resist deformation of the fragment impact.