Simulation and experimental investigation of dust-collecting performances of different dust exhaust hoods

Figures & data

Figure 1. Commonly-used dust exhaust hoods: (a) air updraft exhaust hood (b) Side suction exhaust hood (c) Air-curtain exhaust hood

Table 1. Grid information of the model

	Updraft exhaust hood	Side-draft exhaust hood	Air-curtain exhaust hood
Number of cells	64,321	149,762	36,135
Grid quality	≥0.3	≥0.2	≥0.2

Figure 2. Grids of (a) air updraft exhaust hood (b) Side suction exhaust hood (c) Air-curtain exhaust hood

Table 2. Parameters setting for dust source

Parameter name	Value	Parameter name	Value
Injection name	injection-0	Diameter distribution	Uniform
Injection type	Surface	Diameter (m)	1.0 × 10^−5
Particle type	Inert	Temperature (K)	300
x–velocity (m/s)	0	Start time (s)	0
y-velocity (m/s)	0	Stop time (s)	50
z-velocity (m/s)	0	Total flow rate (kg/s)	2 × 10^−4

Figure 3. Flow lines and velocity vector distribution of single-phase air around the exhaust hoods: (a) updraft exhaust hood, (b) side-draft exhaust hood and (c) air-curtain exhaust hood

Figure 4. Dust collection efficiency of the three models

Figure 5. Spatial dust concentration distributions using three different exhaust hoods: (a) updraft exhaust hood, (b) side-draft exhaust hood and (c) air-curtain exhaust hood

Figure 6. Air-curtain dust hood on the workbench, (a) physical model and (b) gridded model

Figure 7. Effect of air-curtain velocity on dust-capturing efficiency

Figure 8. Effect of the suction airflow rate of the exhaust hood on dust-capturing efficiency