聚多巴胺包覆混合粉体抑制甲烷爆炸的实验研究

To reduce the impact of methane explosion, polydopamine self-polymerization reaction was studied to synthesize polydopamine, which was coated on the surface of silica and calcium carbonate mixed powder, and methane explosion experiment was carried out on the independently developed acrylic pipeline experimental platform. The explosion suppression comparison experiment of mixed powder coated with different concentrations of dopamine was carried out to explore the effect of dopamine concentration on methane explosion. Particle size analysis, scanning electron microscopy, thermogravimetric analysis and other techniques were used to characterize the polydopamine coated mixed powder. The experimental results show that polydopamine coated mixed powder accords with the characteristics of general explosive suppression powder. Combined with the analysis of the maximum explosion overpressure and flame propagation characteristic images, the methane explosion suppression performance was explored. The explosive overpressure was analyzed, when the concentration of dopamine was 0.6 g/L, the polydopamine coated mixed powder had the best explosive suppression performance. Compared with the condition without powder spraying, the maximum explosive overpressure decreased by 32.31%. Finally, the chemical and physical analysis of the mechanism of explosion suppression was carried out in combination with related characterization analysis, and the complex mechanism of explosion suppression was discussed.