Abstract To reduce the energy consumption of the ventilation system for complex operation of multi-vertical (in? clined) shafts, the multi-mode conversion system for ventilation is applied to the segmented longitudinal ventilation of super-long highway tunnels. In this study, based on the theory of wind pressure balance of the circuit and ventilation network in the tunnel, the following design process is proposed: preliminary drafting of tunnel ventilation mode,calculation of maximum traffic bearing capacity, selection of dynamic ventilation mode, determination of jet fan number, and comparison and optimization of ventilation energy consumption. In addition, the operation mode of the multi-mode ventilation conversion system is investigated, and the operation energy consumption is compared and analyzed between the conventional segmented longitudinal ventilation mode and the multi-mode conversion ventilation mode. The results show that when the peak hour traffic volume in the long-term design of the tunnel reaches the maximum value of 3,137 veh/h, 29 sets of jet fans need to be started, and at this time, the wind speed in each section of the tunnel is less than 8 m/s. Mode 1 can meet the ventilation requirements in 31.25% of the time in a day, and only Mode 4 can meet the ventilation requirements in 52.08% of a day, and the total power is reduced by 20.71% for the multi-mode conversion ventilation compared with the ventilation relied only on Mode 4. When the traffic volume is less than 1,726 veh/h, the exhaust air volume of the 3# vertical shaft can be reduced to 93 m3/s, and the total power of fans in the tunnel can be reduced by 37.57%.
Abstract：
To reduce the energy consumption of the ventilation system for complex operation of multi-vertical (in? clined) shafts, the multi-mode conversion system for ventilation is applied to the segmented longitudinal ventilation of super-long highway tunnels. In this study, based on the theory of wind pressure balance of the circuit and ventilation network in the tunnel, the following design process is proposed: preliminary drafting of tunnel ventilation mode,calculation of maximum traffic bearing capacity, selection of dynamic ventilation mode, determination of jet fan number, and comparison and optimization of ventilation energy consumption. In addition, the operation mode of the multi-mode ventilation conversion system is investigated, and the operation energy consumption is compared and analyzed between the conventional segmented longitudinal ventilation mode and the multi-mode conversion ventilation mode. The results show that when the peak hour traffic volume in the long-term design of the tunnel reaches the maximum value of 3,137 veh/h, 29 sets of jet fans need to be started, and at this time, the wind speed in each section of the tunnel is less than 8 m/s. Mode 1 can meet the ventilation requirements in 31.25% of the time in a day, and only Mode 4 can meet the ventilation requirements in 52.08% of a day, and the total power is reduced by 20.71% for the multi-mode conversion ventilation compared with the ventilation relied only on Mode 4. When the traffic volume is less than 1,726 veh/h, the exhaust air volume of the 3# vertical shaft can be reduced to 93 m3/s, and the total power of fans in the tunnel can be reduced by 37.57%.
ZENG Yanhua1,
2 ZHAO Dongxu1,
2 TU Yulong1 etc
.Study on Multi-mode Conversion and Energy Saving of Ventilation in Super-long Highway Tunnel Operation[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(5): 11-19
2023, Vol. 60 