# Study on the Influence of Dust Removal Fan Structure Parameters on Dust Removal Performance
## 4 Numerical Simulation Results and Analysis
### Influence of Rear Guide Vane and Swirl Guide Vane on Performance of Dust Removal Fan  
The dust removal fan impeller model with both a rear guide vane and a swirl guide vane, the model with only a swirl guide vane and no rear guide vane, and the model with only a rear guide vane and no swirl guide vane were established for numerical simulation. The inlet speed was set to 16.405 m/s, the rotational speed of the driving impeller was set to 2900 r/min, and the dust particle size was set to 10 m when the discrete phase was added. The numerical simulation results of the three dust removal fan models are summarized in Table 10.  
The cloud image of dust concentration at the outlet plane of the dust removal fan model with and without rear guide vane and swirl guide vane obtained by numerical simulation is shown in Figure 17. For the convenience of comparison, the value range of the three cloud images is set to 0-0.0005 kg/m\({}^{3}\). The cloud image of dust concentration in axial section of the outlet section of the dust removal fan model with and without rear guide vane and swirl guide vane obtained by \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Model** & **Total Pressure/Pa** & **Static Pressure/Pa** & \begin{tabular}{c} **Driving Impeller** \\ **Shaft Power/kW** \\ \end{tabular} & \begin{tabular}{c} **Total Pressure** \\ **Efficiency/\%** \\ \end{tabular} & \
\begin{tabular}{c} **Static Pressure** \\ **Efficiency/\%** \\ \end{tabular} &
\begin{tabular}{c} **Dust Removal** \\ **Efficiency/\%** \\ \end{tabular} \\ \hline With rear guide & & & & & & \\ blades and swirl & 1546.77 & 1226.94 & 20.526 & 49.71 & 39.43 & 81.31 \\ guide blades & & & & & & \\ \hline With swirl guide & & & & & & \\ \(\text{vane but without}\) & 1419.74 & 1106.83 & 20.332 & 46.07 & 35.91 & 87.16 \\ back guide vane & & & & & & \\ \hline With rear guide & & & & & & \\ \(\text{vane but without}\) & 1874.26 & 1782.67 & 20.373 & 60.69 & 57.73 & 67.65 \\ swirl guide vane & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Comparison of numerical simulation results of dust removal fan model with and without rear guide vane and swirl guide vane. Figure 17: Dust concentration cloud image of dust removal fan with and without rear guide vane and swirl guide vane. (**a**) With rear guide blades and swirl guide blades; (**b**) with swirl guide vane but without back guide vane; (**c**) with rear guide vane but without swirl guide vane. numerical simulation is shown in Figure 18. For the convenience of comparison, the value range of the three cloud images is set at 0-0.0008 kg/m\({}^{3}\). According to the numerical simulation results, adding the rear guide vane structure can improve the total pressure efficiency and static pressure efficiency of the dust removal fan but will reduce the dust removal efficiency of the dust removal fan. Based on the dust concentration cloud image of the outlet plane and the axial section of the outlet section of the dust removal fan, when there is no rear guide vane, the dust distribution area at the outlet of the dust removal fan is narrower and the dust distribution in the outlet section is closer to the side wall surface. This occurs because, in the traditional axial fan, the rear guide vane weakens the swirl and improves the total pressure efficiency and static pressure efficiency. However, weakening the swirl also reduces the centrifugal force on the dust particles inside the dust removal fan, decreasing the probability of collision between the dust particles and the water film on the side wall of the dust removal fan, resulting in decreased dust removal efficiency. Therefore, from the perspective of improving the overall  
Figure 18: Dust concentration cloud image of axial section of outlet section of dust removal fan with and without rear guide vane and swirl guide vane. (**a**) With rear guide blades and swirl guide blades; (**b**) with swirl guide vane but without back guide vane; (**c**) with rear guide vane but without swirl guide vane.