## 5 Field Application  
In order to study the dedusting effect of the swirling curtain dust collector, the measurements of dust concentration at number 4 and number 5 transfer stations in Luohe Iron Mine located in east China were performed. The number 4 and number 5 transfer stations were firstly designed to have a set of ultrasonic atomization dust suppression systems for dust removal of number 8 and number 9 belt conveyor head, and number 9 and number 10 belt conveyor feeding. However, the atomizer has been clogged up with dust and the dust removal effect is terrible. Thus, two sets of high-efficiency swirling curtain dust collectors are used for dust collecting in number 4 and number 5 transfer stations (XLWM-1.5, dust removal air volume: 15,000-17,000 m\({}^{3}\)/h, resistance: 800-1000 Pa). In addition, two fans were matched with air volume 18,904-22,999 m\({}^{3}\)/h and air pressure 3664-3488 Pa.  
In order to evaluate the dedusting effects, four dust sampling points were placed when the transfer station was operating. Two of the points were positioned at the blanking area of number 8 and number 9 belt conveyor, and the other two were located at the end unit of number 9 and number 10 belt conveyor. The testing points were set at a height of 1.5 m above the ground. The concentrations of the dust were measured by using dust-measuring instrument (TH-880 F; sampling flow: 5-60 L/min; accuracy: \(\pm\)2.5%) and inclined manometer (YYT-2000B; range: 0-2000 Pa; accuracy: 1%). For the purpose of reducing the measurement errors, three group tests were conducted. The mean value of several measurements was taken for analysis.  
Table 3 lists the dust concentrations before/after installing the swirling curtain dust collector.  
As shown in Table 3, the dust concentration decreased from 32.7 mg/m\({}^{3}\) to 4.3 mg/m\({}^{3}\) on average, when the SCDC was adopted. Table 4 shows the dust removal efficiency of SCDC used in number 4 and number 5 transfer stations.  
The dust removal efficiency in both number 4 and number 5 transfer station was over 99.8%. The average dust concentration at the outlet of SCDC is far below 20 mg/m\({}^{3}\), which is stipulated by  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Site**} & \multirow{2}{*}{**Air Volume (m\({}^{3}\)/h)**} & **Dust Concentration at** & **Dust Concentration at** \\  & & **Inlet of SCDC** & **Outlet of SCDC** \\  & & **(mg/m\({}^{3}\))** & **(mg/m\({}^{3}\))** & **Dist Removal** \\ \hline No. 4 TS & 16,000 & 3577.2 & 5.31 & 99.85 \\ No. 5 TS & 16,000 & 3824.6 & 6.49 & 99.83 \\ \hline \hline \end{tabular} Note: TS denotes transfer station.  
\end{table}
Table 4: Dust removal efficiency of SCDC used in number 4 and number 5 transfer stations.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Site** & **Before Used SCDC (mg/m\({}^{3}\))** & **After Used SCDC (mg/m\({}^{3}\))** \\ \hline Head blanking of No. 8 belt conveyor & 28.65 & 3.74 \\ Tail receiver of No. 9 belt conveyor & 35.27 & 4.58 \\ Head blanking of No. 9 belt conveyor & 26.38 & 3.65 \\ Tail receiver of No. 10 belt conveyor & 40.31 & 5.12 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Dust concentration in number 4 and number 5 transfer stations.  
Chinese standard GB 28661-2012 [25]. Figure 14 shows the comparison of dust distribution before/after SCDC used in transfer station of Luohe Iron Mine in China. Obviously, the application of SCDC is effective at reducing the dust in a transfer station.  
Therefore, it could be concluded that the device designed in this study would be ideal for the production system of a mine.