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Published on: June 8, 2015
Research on dust diffusion reduction-control technology of wind guide hood system based on an improved tunnel
Haonan Zhang1, Xinpeng Liu1, Yun Hua1
1College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong Province, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
Abstract:
The dust generated during tunnel construction poses a serious threat to the health of construction workers. High dust concentrations rapidly spread throughout the tunnel, severely polluting the construction environment. To improve these conditions, the present study sought to develop a wind volume-wind direction guide device, hereinafter referred to as wind guide hood (WGH), which can regulate the pressure air volume in real time. The WGH ventilation and dust control system divides the wind volume into two parts while maintaining a total pressurized air volume of 500 m3/min. One part of the wind volume flows to the digging working face through a pressurized air cylinder, whereas the other part is discharged to the back side of the tunnel, thus achieving dust control. By separating the airflow, the system minimizes the airflow to the face, thereby slowing down dust diffusion. The results revealed that installing the WGH system effectively controls dust propagation. When the airflow to the face is 20 m3/min, the diffusion distance of high-concentration dust is reduced to 18.7 m, and the dust control efficiency is increased by 68.04 %, thereby greatly improving the working conditions within the tunnel.
