为了研制出起泡力强,附着力好的泡沫溶胶液的最佳配方,运用正交试验的方法,对构成泡沫溶胶液的阴离子表面活性剂A,阳离子表面活性剂B,附加剂C,与交联剂D复配体系进行了四因素三水平2项考察指标的正交试验研究。试验得出,构成泡沫溶胶液的最小表面张力值为29.94 m N/m组合为A1B3C3,最大黏度值为109 m Pa·s组合为A3B3C3D1。研究结果表明,既满足表面张力最小,又满足黏度最强的泡沫溶胶液的最佳组合为A1B3C3D1。
针对传统方法的不足,提出了泡沫溶胶控制煤尘技术,并对泡沫溶胶湿润和黏附煤尘的特性进行了研究。基于湿润性动态接触角模型,分别对水性泡沫、泡沫溶胶和去离子水的湿润性和黏附功进行了对比分析;利用Zisman图对浸湿煤尘的湿润剂临界表面张力值进行了分析。研究得出泡沫溶胶具有较好的煤尘湿润性,起泡能力和较强的黏附功;当润湿剂的表面张力值小于28.32 m N/m,可完全浸湿煤尘,当润湿剂的表面张力值大于73.77 m N/m,不能浸湿煤尘。研究得出在捕捉动态煤尘时,泡沫溶胶的捕尘效果应明显优于水性泡沫和去离子水。
In order to effectively control the dust at the transshipment point with foam-sol, this paper attempted to study the characteristics of dust diffusion at transshipment point and the foam-sol foaming device with diffusion outlet was also designed in this paper. To study the diffusion rules of coal dust, fluent discrete phase model was utilized in the numerical simulation, as the coal dust was thrown down at a horizontal velocity of 2.5 m/s. A foam-sol foaming device was designed, through which foaming agent could be automatically sucked into the Venturi by the negative pressure. The automatic controller was also equipped,which could transform the energy of the compressed air into the constant pressure difference so that the gelling agent could be qualitatively added into the gel container. The diffusion outlet that could spray out foam-sol in a continuous, conical and 3D manner was also designed. Moreover, this paper also carried out the contrast experiments on dust removal efficiency among water, aqueous foam and foam-sol. The results clearly show that the symmetrical whirlpools appeared below the inlet where the largest whirlpool diameter was 0.52 m, and the horizontal distance from swirl range to the inlet was approximately0.69 m. By using the self-designed foaming device, the foaming was multiplied by 30 times and the volume ratio with water and foaming agent reached 95%:5%. In this context, the gas pressure was controlled at 0.3 MPa, with gas flow at 15 m3/h and water flow at 0.5 m3/h, with water pressure controlled between0.34 and 0.36 MPa. The foam-sol has the highest dust removal efficiency than other agents.
