The working principle of an attached wall duct is to use the wall effect of airflow to transform the axial airflow of the pressure ventilation into radial airflow.
The working principle of the Semi Rigid Ventilation Duct is as follows:
Wall effect of airflow: There are exhaust valves installed at the end of the air duct. When the tunneling machine is working, these valves will close, allowing airflow to be sprayed out at high speed through a narrow nozzle. This high-speed airflow will rotate along the wall of the tunnel and move forward, forming a wind wall.
Control dust diffusion: This wind wall can block the outward diffusion of floating coal dust near the working face, effectively limiting the dust generated by the excavation machine during cutting to a certain range.
In addition, research has shown that the use of Semi Rigid Ventilation Ducts can achieve the highest dust control rate near the outlet of the duct, especially at a distance of 3 to 5 meters from the excavation face, effectively controlling secondary dust phenomena.
Overall, Semi Rigid Ventilation Duct is an efficient dust control technology that effectively controls the dust in the coal mine comprehensive mining face by changing the direction and speed of air flow, improves the working environment, enhances work efficiency, and reduces the occurrence of occupational diseases.
The main purpose of the attached wall air duct is to control dust on the fully mechanized mining face.
Specifically, Semi Rigid Ventilation Duct dust control technology is a technology applied in the field of coal mining. It utilizes the principle of air flow wall attachment effect to transform the axial airflow of pressure ventilation into radial airflow, forming an air wall. This air wall can suppress the dust generated by the excavation machine during cutting within a certain range under the negative pressure suction of the dust collector, effectively controlling the dust diffusion in the excavation face. This technology was first invented and patented by Krenell in 1965, and later widely applied internationally. It was introduced to China in the 1980s.
In China, after years of improvement and optimization, the Semi Rigid Ventilation Duct technology has become one of the most effective dust control methods in engineering practice, and is also the main recommended dust control measure by domestic dust removal equipment manufacturers. Through this technology, the working environment can be significantly improved, the incidence of occupational diseases can be reduced, and the safety and efficiency of the workplace can be improved.