The Coupling Mechanism And Resilience Enhancing Theory Of Two-source Blast Waves In Chemical Tank Farm

As an important distribution base for chemical products and raw materials,the chemical tank farm is an important part of chemical industry park.Because the tanks in tank farm are arranged closely and the storage medium has the characteristics of flammability and explosive,it is easy to cause domino effect once the fire and explosion accidents occur,resulting in the damage and failure of other tanks around.As the main damage factor of domino accident,the multi-source blast wave coupling often occurs,which will cause more serious accident consequences than single blast wave.Therefore,it is of practical significance to study the coupling mechanism and resilience enhancing theory of multiple-source blast waves to contain domino accident in chemical industry park.This paper takes the coupling impact of two-source blast waves as an example,the main contents are as follows:(1)Analysis for damage effect of two-source blast wave coupling on storage tank at different initiation intervals.Determine the different conditions of blast wave coupling,build a full-scale real scene model of arch-roof storage tank under the impact of explosion and verify its reliability by small-scale tank impact experiment.Considering five conditions of simultaneous initiation and initiation interval of 2 ms,4 ms,6 ms and 8 ms respectively in dual-load explosion,the propagation law of blast wave overpressure in air and the distribution law on the tank wall surface are studied.The effects of different initiation intervals on tank damage are analyzed from four aspects: energy,stress,deformation displacement and macroscopic failure shape.(2)Dynamic response analysis of storage tank under simultaneous explosion coupling of two-source blast waves.The dynamic response laws of deformation displacement,velocity,vibration acceleration,stress and strain for storage tank in four cases of angle between two loads are studied.The results are compared with the corresponding parameters of the same tank only subjected to single blast wave,and the enhancement degree of the coupling effect on the tank damage is obtained.The difference of the tank wall damage degree caused by four blast wave coupling cases is analyzed,and the failure mode and mechanism of tank are explained.(3)Domino effect analysis of chemical tank farm under the coupling impact oftwo-source blast waves.Based on the occurrence condition of domino accident and the calculation method of accident escalation probability,four kinds of accident links for the development of domino effect in tank farm under the initial accident scenario of two-source blast wave coupling are analyzed through Bayesian network,and the most dangerous accident link scenario under the coupling impact of two-source blast waves is identified,which lays the foundation for the next chapter to explore different resilience enhancing measures.(4)Study on the resilience enhancing measures of chemical tank farm under the coupling impact of two-source blast waves.Through quantitative characterization and analysis of the tank resilience by index function,the region range of the tank with recoverable resilience is drawn.From two aspects of enhancing the anti-explosion performance of the tank and reducing the blast wave strength,this paper analyzes the effectiveness of five resilience enhancing measures,which are the filling height of oil,the setting height of explosion-proof wall,the tank roof type,the tank wall distance and the tank wall thickness,obtains the relatively effective resilience enhancing measures in the tank farm.