Study Of Dynamic Response Of Large-scale Tank Under Blast Loads

Crude oil is flammable, explosive and other dangerous, leaks, fires, explosions or mine easy to have an impact on the tank. In numerous accidents, explosion debris is an important cause which cause more explosion. When tank exploded, debris will act on the other tanks around the explosive tank. The domino effect caused by the debris of explosion is common, and accidents often cause very serious consequences, even greater than the initial severity of the accident. Therefore, this paper will study on dynamic response analysis of debris hitting the tank in this process.In order to ensure the safety of equipment and facilities in and around the tank, in this thesis, Author consider the characteristics of the tank structure, use a large general-purpose finite element analysis software-ANSYS / LS-DYNA which used to simulate that process of debris hit tank, analysis the dynamic response and evaluate the safety of tank.In this paper, the basic components of the tank are first studied, then a dynamic model of the response of the tank is established, the main factors of tank response are analyzed, the debris hit the tank finite element simulation is realized, and comparison with the experimental data and empirical formula to prove the reliability of the finite element model. it was validated finite element model drawn tank established in this paper can simulate well the power of debris hit the tank response process.By sequentially change the mass, velocity, contact area and angle then simulate the tank response process, Quantitative analysis these factors which influence the response of dynamic debris tank. Except that the contact area is a negative correlation with the stability of the storage tank, other factors are positive correlation.For example, within 40-110 m / s range of impact velocity, when speed increases 10m/s, X axial-displacement increases about 10 mm, X axial-acceleration maximum increase about 3m/ s2, X-velocity maximum increases about 2m /s, the impact time reduce about 0.001 s.According to the simulation results, the methods of failure prevented for large crude oil storage tanks under blast loading were studied, and preventive countermeasures in explosion prevention, security, daily management, emergency response, etc. were proposed preventive countermeasures are proposed against the simulation results. Through this study, effective and reasonable measures are put forward for design of the tank and protection measures. put forward reasonable proposals for effective tank design, safety precautions by changing the material or thickness of wall to reduce the response of debris hitting the tank.