瓦斯压力条件下表面活性剂对煤尘润湿—沉降行为的影响研究OA

In response to the challenges of increased coal dust and coal dust explosions faced by the deep mining extension of Dameigou Coal Mine,a study was conducted on the influence mechanism of gas pressure on coal dust wettability.Taking coal samples from the F1 coal seam of Dameigou Coal Mine as the research object,anionic and nonionic surfactants were selected to test the coal dust settling rate and contact angle under atmospheric pressure and a pressure gradient of 1～2 MPa CH4.The results showed that under normal pressure conditions,a fast infiltration T with a mass fraction of 0.30％can increase the settling rate of coal dust to 20.58 mg/s,minimize the contact angle with the coal body,and exhibit the best wetting settling performance.When the pressure rises to 1 MPa,the contact angle between SDBS solution and coal body is the smallest and the amplification is the smallest,showing good compressive stability.All con-tact angles of the system increase with increasing pressure,because the mass fraction of anionic surfactant solution can significantly im-prove the wetting settling effect of coal dust when it approaches the mass fraction corresponding to micelle formation,and the competition of gas molecules for adsorption sites is the main mechanism leading to the attenuation of wettability under high pressure.The research results not only reveal the inhibitory law of gas pressure on coal dust wetting,but also provide experimental basis and theoretical support for the development of accurate and efficient dust reduction plans in Dameigou Coal Mine.