Influence of coal dust cloud on relative radiation intensity of six intermediates in gas explosion

The gas and coal dust hybrid explosion in coal mines is a typical gas-solid two-phase chemical reaction. To highlight the development law of reaction intermediates in the process of explosion of gas containing coal dust, using the transient flame propagation experimental system, the phenomenon of explosion of gas containing coal dust was studied from the perspective of microscopic flame spectrum detection, and the influence of coal dust cloud addition on the spectral characteristics of gas explosion intermediates was revealed. Spectrometer was used to capture the emission spectral signal radiation intensity of the key intermediates generated in the mixed system explosion of 7%,8%,9%,10%,11% gas concentration and long-flame coal, charred coal, anthracite coal dust cloud at the concentration of 130 g/m³ coal dust. The results show that in the mixed system formed by the same concentration 130 g/m³ of long-flame coal/charred coal/anthracite coal dust cloud and different concentrations of gas explodes, compared with the radiation intensity peak of intermediates of pure gas, the radiation intensity is enhanced, and the enhancement amplitude of the lower fiber peak is larger than that of the upper fiber peak, the relative radiation intensity peaks of the six reaction intermediates are in the order of C₂·>O·>CH₂O>CH·>O₂>CHO·. The influence of the degree of coal metamorphism on the peak relative radiation intensity of intermediate products is ranked from large to small: long-flame coal > charred coal > anthracite coal dust cloud. The coal dust cloud participates in the gas explosion, which enhances the concentration of the six intermediates in the gas explosion system. The coal dust cloud has a stronger influence on the relative radiation intensity peak of the low-concentration gas explosion intermediates than the high-concentration gas. The cumulative rates of CH₂O,O·,and C₂· are more affected by coal dust clouds with different metamorphic degrees than CHO·,and O₂. When researching and developing new detonation suppressors for gas explosions in the later stage, the three reaction intermediates of CH₂O/O·/C₂· can be comprehensively considered as one of the targeted inhibition targets, to improve the detonation suppression efficiency of new detonation inhibitor.