Research progress on explosion dynamic characteristics and mechanism of hybrid mixtures

Combustible dust and flammable gases are widely present in all aspects of industry and trade. Even when the concentrations of dust and gas are below the lower explosion limit, the mixed system still has the possibility of explosion. Compared with a single dust or gas, the hybrid mixtures have a higher explosion risk. In this paper, the explosion sensitivity parameters, explosion intensity parameters, flame propagation characteristics and its explosion mechanism of hybrid mixtures are investigated from three aspects (explosion conditions, explosion effect and explosion mechanism). The results show that the explosion characteristics of hybrid mixtures are mainly affected by the powder particle size, powder concentration, powder physicochemical properties and combustible gas concentration, and there are great differences between different hybrid mixtures. In addition, hybrid mixtures are divided into two major categories based on the powder thermal stability, and the explosion mechanism of different hybrid mixtures is examined. Based on this, the future research work focusing on the explosion prevention and control of hybrid mixture is put forward, which provides theoretical guidance for the safe production of gas-powder related explosive enterprises in industrial and mining sectors. © 2024 Materials China. All rights reserved.