Fig 1.
Two synergistic schemes for dust removal.
(a) Scheme Ⅰ: acoustic pretreatment + high-pressure spray; (b) Scheme Ⅱ: ultrafine droplet nucleation + acoustic agglomeration + high-pressure spray.
Fig 2.
Schematic diagram of the experimental setup for acoustic-spray synergistic dust removal.
Fig 3.
Particle size distribution of the experimental coal dust.
Fig 4.
Spray angle for three nozzle orifice sizes.
Fig 5.
Droplet size distribution in high-pressure water spray.
Table 1.
Experimental parameters for experimental Scheme I.
Table 2.
Experimental parameters for experimental Scheme II.
Fig 6.
Numerical simulation model for particle-droplet interaction dynamics in a standing-wave acoustic field.
Table 3.
Parameter values for numerical calculation.
Fig 7.
Dust removal efficiency as a function of nozzle orifice diameter.
Fig 8.
Dust removal efficiency as a function of acoustic power.
Fig 9.
Dust removal efficiency as a function of air velocity.
Fig 10.
Removal efficiency as a function of coal dust particle size at different air velocities.
Fig 11.
Trajectories of dust particles under different ultrasonic energy densities.
(a-1) dp = 2.5 μm, Eac = 0.5 J/m3; (a-2) dp = 2.5 μm, Eac = 5J/m3; (a-3) dp = 2.5 μm, Eac = 10 J/m3; (b-1) dp = 10μm, Eac = 0.5 J/m3; (b-2) dp = 10 μm, Eac = 5 J/m3; (b-3) dp = 10 μm, Eac = 10J/m3.
Fig 12.
Spatial distribution of dust particles at different ultrasonic energy densities.
(a-1) dp = 2.5 μm, Eac = 0.5 J/m3; (a-2) dp = 2.5μm,Eac = 5J/m3 (a-3) dp = 2.5μm,Eac = 10J/m3; (b-1) dp = 10μm, Eac = 0.5J/m3; (b-2) dp = 10μm,Eac = 5J/m3; (b-3) dp = 10 μm, Eac = 10J/m3.
Fig 13.
Evolution of particle concentration distribution along the flow direction.
(a) dp = 2.5 μm, Eac = 5 J/m3; (b) dp = 2.5 μm, Eac = 10 J/m3; (c) dp = 10 μm, Eac = 0.5 J/m3; (d) dp = 10 μm, Eac = 10 J/m3.
Fig 14.
Trajectories of droplets under different ultrasonic energy densities.
(a-1) dw = 10 μm, Eac = 0.5 J/m3; (a-2) dw = 10 μm, Eac = 5J/m3; (a-3) dw = 10 μm, Eac = 10 J/m3; (b-1) dw = 20 μm, Eac = 0.5 J/m3; (b-2) dw = 20 μm, Eac = 5 J/m3; (b-3) dw = 20 μm, Eac = 10 J/m3; (c-1) dw = 50 μm, Eac = 0.5 J/m3; (c-2) dw = 50 μm, Eac = 5 J/m3; (c-3) dw = 50 μm, Eac = 10 J/m3.
Fig 15.
Evolution of droplet concentration distributions.
(a) dw = 10 μm, Eac = 5 J/m3;(b) dw = 10 μm, Eac = 2.5 J/m3; (c) dw = 20 μm, Eac = 0.5 J/m3; (d) dw = 20 μm, Eac = 10 J/m3.