Abstract
ABSTRACT Sodium dodecyl sulfate (SDS) is widely used as a surfactant for dust suppression in coal mines to improve the collection efficiency of coal dust. Dust that settles may become airborne again after losing moisture through evaporation, posing an explosion risk. The extent to which residual SDS in coal dust affects the ignition sensitivity of coal dust is currently unclear. This study investigates the ignition sensitivity of raw bituminous coal dust, bituminous coal dust soaked in deionized water, and bituminous coal dust soaked in sodium dodecyl sulfate solutions of three different concentrations (0.1%, 0.3%, and 0.5%). The results indicate that coal dust soaked in SDS solutions exhibited a higher sensitivity to fire than coal dust soaked in deionized water. The susceptibility of bituminous coal dust cloud to ignition tends to increase with the increase of SDS concentration. In the case of satisfying the dust reduction effect, the lower the SDS concentration in the dust suppression solution is more favorable to coal dust explosion prevention. The ignition sensitivity was highest when the coal dust concentration reached 1111 to 1250 g/m3.
Published Version
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