Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
The Kan-etsu Tunnel is the longest mountain tunnel in Japan, with a length of approximately 11 km, and longitudinal ventilation is operated using fans installed in two underground ventilation stations and one precipitator room on each of the outbound and inbound tunnel. These fans have a variable rotor blade angle in consideration of air volume adjustment and the effect on the electric motor. In recent years, there have been occasional cases which it has become difficult to adjust the blade angle of the fans installed in the precipitator room due to rust caused by antifreeze sprayed in winter. Therefore, it was required to consider upgrading the system to one with a fixed blade angle and variable motor speed controlled by an inverter. This report describes the results of tests conducted during the retrofit and the operating status after the retrofit.
