Numerical Simulation And Reinforcement Technology Of Explosion Damage In Control Room Of Chemical Plant

The control room in modern large-scale chemical plants serves as the central hub for monitoring,diagnosing,and maintaining equipment and systems across various areas of the plant.As the core department responsible for operational control,the structural integrity of the control room directly affects the stable production of the chemical plant.If the control room is damaged in an explosion,it can directly impact the normal operation of equipment and even trigger secondary accidents.It is evident that the structural blast-resistant design and reinforcement of the control room in chemical plants are not only crucial for ensuring the safety of control room operators but also critical for preventing secondary accidents.In chemical plants,the design and calculation of explosion-resistant control rooms are typically conducted in accordance with the GB50779-2012 "Design Specifications for Petrochemical Control Rooms." The standard requires the consideration of peak incident overpressure and positive pressure duration as the load for calculating the explosion resistance design of control rooms.However,the simplified bilinear model employed in the standard differs from the actual nonlinear explosion loads,making it difficult to meet the requirements for accurate blast resistance verification,as well as for conducting refined design or structural optimization.Therefore,it is of significant importance to conduct precise research on explosion loads in control rooms,simulate the dynamic response of structures,and study reinforcement schemes for the original structure based on the dynamic response results.The main research work of this article is as follows:(1)A research study was conducted to investigate the basic forms,processes,and characteristics of explosions,specifically focusing on the differences in energy density,energy release rate,and energy release rate between gas cloud explosions and solid explosive materials.The study further delved into the two-wave three-zone structure of shock waves produced by gas cloud explosions,mathematical models for explosions,calculation methods for equivalent charges,and the theory of explosion similarity laws.(2)Using LS-DYNA software and the Arbitrary Lagrangian-Eulerian(ALE)fluidstructure coupling explosion simulation method,numerical simulations are conducted to investigate the explosive impact response of a reinforced concrete(RC)beam.The study focuses on the process where the explosion shock wave acts on the upper part of the beam,undergoes flow around it,and then collides and reflects off the ground,causing damage to the bottom of the beam.By comparing the failure modes with those of typical beam structures,it is found that the numerical simulation results match the experimental results in terms of the failure patterns on the front,back,and side surfaces of the beam,thereby validating the reliability of the numerical simulation method and parameters.(3)Based on the numerical simulation model of the control room explosion,this study investigates the loads generated by the shock waves of different explosion heights and equivalent charges on each wall.The characteristics of overpressure along the propagation path of the explosion shock wave under different operating conditions and the distribution of shock wave pressure on the blast-facing surface of the control room are examined.The analysis of impact force and impulse data for the control room’s rear wall,side walls,and roof is conducted,providing reference for subsequent calculations of dynamic response and damage under control room explosion loads.(4)Taking typical components as the research object,simulations are conducted on schemes such as polyurea spraying,composite material bonding reinforcement,and steel plate reinforcement to determine the optimal method of strengthening the components.The research conclusions are applied to the blast-resistant reinforcement design of the control room to validate the feasibility of the blast-resistant reinforcement scheme.(5)Through the analysis of the damage status of the structure after polyurea spraying under explosion loads,it is determined that the original structure of the control room is relatively weak,and reinforcement through polyurea spraying is unable to withstand a 3-ton TNT equivalent explosion load.Therefore,a protective shield structure is chosen for explosion load isolation.By comparing the damage conditions of the protective shield with different blast plate thicknesses under explosion loads,an appropriate protective shield structural solution is selected to ensure the safety of the control room under explosion loads.The innovation of this article lies in the systematic study of explosive loads using the fluid-structure interaction method.By detailed modeling instead of equivalent reinforcement ratio,the overall structure of the control room is simulated to obtain more accurate structural damage data.The blast resistance of the shelter and structural selection were evaluated through numerical simulation methods.