Abstract:

To improve the dust suppression performance of the spray on coal dust, the synergistic method among the surfactants and polymers was used to enhance the wetting adhesion property of the solution. The synergistic improvement effect of the polymer on the wetting and adhesion performance of the surfactant solution was studied by using the static wetting parameters of the solution (surface tension, contact angle, adhesion force, viscosity), molecular dynamics simulation and the atomization dust suppression test system, and a dust suppression solution with both wetting and adhesion properties was developed. The results show that the single surfactant significantly improves the wetting performance of the solution, while the adhesion force is greatly reduced. After adding a small dose of polymer, the adhesion of the aqueous solution is significantly improved, but the wetting performance is not good. Under the effect of the polymer, the adhesion performance of the surfactant solution is significantly enhanced while maintaining little change in its wetting performance. Under the influence of polymers, the interaction between coal and surfactants becomes significantly stronger, and the surfactant molecules are more easily able to adsorb onto the coal molecules. Furthermore, with the increase of the polymer mass fraction (0-0.15%), the droplet size of the surfactant solution shows a changing trend of first slowly increasing and then rapidly increasing. Meanwhile, the dust suppression efficiency shows a trend of first rapidly increasing and then tending to stabilize, and the inflection point of the mass fraction is all 0.05%. Under the synergistic effect between the surfactant and polymer, the dust suppression performance of the spray field is remarkably improved. Moreover, the compound solution prepared with 0.03% surfactant O and 0.05% polymer B has good wetting and atomization adhesion performance to coal dust, and the dust suppression efficiency reaches more than 88%.

Key words: polymer, surfactant, coal dust, solution atomization, synergistic effect, wetting adhesion property, dust control ability