Dedusting and inhibition of methane-coal dust hybrid explosion by ultrafine water mist containing SDS surfactant

Abstract

The dust reduction and inhibition effects of ultrafine water mist containing SDS anionic surfactant on methane-coal dust explosion were experimentally investigated. Compared with pure ultrafine water mist, the Pmax and (dP/dt) max of 0.5% SDS water mist were reduced by 9.18% and 27.2%, respectively, and the explosion induction period was prolonged from 102 ms to 205 ms. SDS water mist can effectively inhibit the intensity and propagation of the flame, forming the formation of irregular fronts and unevenly colored orange flames after multiple extinguishments in the explosion induction period. In addition, the addition of SDS surfactant promotes the formation of liquid bridges between water mist and coal dust particles. The contact angle of coal dust is reduced by 38.9% and the sink time is reduced to 30 ms. This paper presents a new direction and choice for achieving simultaneous dust reduction and explosion suppression in coal mines.