Research status and development trend about combustible gas explosion venting

In order to ensure the safe transportation and storage of highly flammable and combustible gases, it is essential to implement effective prevention and control measures. Explosion venting is an effective way to prevent and control its explosion hazards. In order to improve the efficiency and safety of explosion venting means and to promote the further study of secondary explosion in the external flow field of explosion venting, the research status of combustible gas explosion and explosion venting at home and abroad is analyzed, and meanwhile, the theory and achievements of combustible gas explosion venting in recent 20 years are summarized. Existing researches have shown that the explosion characteristics of combustible gases has been studied systematically, providing underpinning data for the study of combustible gas venting characteristics. A comprehensive examination of the explosion parameters and flame development alterations was performed in the internal and external flow fields resulting from deflagration. The hazard of deflagration was found to be exacerbated by the coupling between pressure waves and flame waves in the internal and external flow fields. The effectiveness of deflagration was evaluated based on the results of the study. It is difficult to define the initiation of the secondary explosion because the secondary explosion in the vent outflow field is limited by the poorly recognized evolutionary mechanism of blast-flame coupling. A preliminary study of the effect of the secondary explosion on the variation of the deflagration parameters has been carried out. In the explosion venting research, it is still necessary to narrow the span of influencing factors in the experimental aspect and improve the explosion venting equipment. In the numerical simulation research, it is necessary to carry out the study of complex models, the prediction of explosion venting hazards and the evaluation of the effect of explosion venting, which still need a lot of data and good models. Accordingly, the safe transportation and storage of flammable gases can be realized and the applications of flammable gases can be broadened.