垃圾焚烧飞灰对瓦斯爆炸压力及火焰传播的抑制作用及机理研究

The effects of different mass of waste incineration fly ash (FA) powder on methane explosion pressure, flame propagation velocity and flame propagation morphology were studied by self-built visual methane explosion experimental platform under the conditions of methane gas concentration of 8% (oxygen-enriched), 9.5% (equivalent) and 12% (oxygen-poor). The composition, particle size, surface microstructure and thermal stability of FA were analyzed by XRD, particle size analysis, scanning electron microscopy and thermogravimetric analysis. Combined with physical characterization, the explosion suppression mechanism of FA was analyzed. The results show that FA has a good explosion suppression effect on different concentrations of methane explosion. In this experiment, the best spraying amount of FA for 8%, 9.5%, and 12% methane inhibition was 360 mg, 360 mg, and 400 mg, respectively. The addition of FA powder hinders the development and propagation of methane explosion flame, disrupts the flame shape, and the flame intensity is obviously weakened. The FA has smaller particle size, porous microstructure, larger specific surface area and porosity, and higher heat absorption, with a total mass loss change of 37.07%. FA powder has dual explosion suppression properties of physics and chemistry.