NEW ASPECTS OF EXPLOSIVE CHARACTERISTICS OF HYBRID MIXTURES OF DUST/GAS DISPERSIONS

Abstract

A small amount of flammable gas mixed with dust can cause a large explosion with serious consequences. In this study, explosions of hybrid mixtures will be performed in an explosion chamber with a volume of 0.02 m3 and 1.00 m3. Research into testing the explosion characteristics of hybrid mixtures is usually conducted under standard conditions. Testing the explosion characteristics of hybrid mixtures at higher initial temperatures has already been presented in several earlier studies. Hybrid mixtures are created and occur, for example, in biomass gasification technology, which is located at VSB-TU Ostrava, where synthetic gas is the output of the entire technology. In technology, the hybrid mixture can be created in a �hot filter�, where a working temperature of 450 �C is required. This technology is not unique, similar gasification technologies are found in other academic or industrial fields in the world. However, they may differ slightly from each other. Given that there is currently a noticeable shift away from fossil fuels and the search for different alternatives, it is possible that these gasification technologies will increase in the world. With this, the risks resulting from the use of these technologies will also increase, i.e. the risks of fires and explosions (and not only from potential hybrid mixtures created in these technologies). In this study, the effect of further increasing the initial temperatures will be presented. It was found that as the temperature increases, the values of the explosion characteristics decrease. This has a major impact on the determination of explosion characteristics in industrial plants (e.g. in the food industry or biomass gasification technologies) where non-standard conditions occur.