Research on Intelligent Ventilation Systems with Fan Frequency Regulation During Tunnel Construction

A reliable and efficient ventilation system is a crucial technical measure to address the pollution of dust and harmful gases during tunnel construction. In many cases, the required airflow for tunnel construction is significantly lower than the designed fan capacity, which leads to high energy consumption and low efficiency. Therefore, it is essential to choose an appropriate fan operating frequency for the ventilation system based on the concentration of pollutants generated by different tunneling processes. In this paper, an intelligent ventilation system with fan frequency regulation is designed based on the embedded system. It can adjust the frequency of the fan according to the tunnel environment. The system has been implemented in a construction tunnel in China for over two months and has demonstrated satisfactory performance in improving the environment. The results of historical data analysis show that the system can reduce electricity consumption by approximately 31% compared with the manual control method.