Explosion protection

Abstract: Handbook of Fire and explosion protection engineering principles , Handbook of Fire and explosion protection engineering principles , کتابخانه دیجیتال جندی شاپور اهواز

Abstract: An experimental apparatus for the methane and air mixture explosion with N2/CO2 in a closed vessel was set up. A series of experiments have been performed to analyze the effects of N2/CO2 on explosion strength, limiting oxygen concentration, flammability limits and explosion suppression. Results show that explosion strength decreases with the volume fraction of N2/CO2 in the mixture. Limiting oxygen concentration decreases linearly with the volume fraction of N2 in N2/CO2 mixture. The flammability limits change linearly with the volume fraction of N2/CO2 in the mixture. The higher the volume fraction of CO2 in N2/CO2 mixture, the better the explosion suppression effect is. Based on experimental data, fitted equations and diagrams are made to predict methane flammability limits with N2/CO2 under different volume fraction ratio of N2 and CO2. The research results can be used as a reference for the inerting treatment design of methane explosion protection in process industries.

Abstract: This paper gives first a short overview of some basics of blast wave propagation and blast wave reflection. The reflected overpressure-time history, which is the design load, depends on the shape and geometry of the structures where the blast wave is reflected. It presents some shape studies which show the influence of shaping on the explosion design load. These shape studies include horizontal shapes (e.g. cross section of columns), vertical shapes (e.g. facades) and spatial shapes of buildings. The paper further shows that shrub plantings reduce blast loads. It also discusses the use of flexible materials and constructions and the influence of the urban situation on the design.