Abstract In light of an unbalanced ventilation load between the left tube and right tube of 4~7 km-long tunnels, a new method named twin-tube complementary ventilation is presented. Two air exchange cross channels were set up between the left tunnel tube and right tunnel tube, and extra jet fans were installed in the downhill tunnel in order to transport the surplus fresh air to the uphill tunnel through one air exchange cross channel to attenuate the pollutant concentrations and make the polluted air in the uphill tunnel flow into the downhill tunnel through another air exchange cross channel and reduce the air velocity in the uphill tunnel, by which the air quality of the two tunnel tubes can meet the relative sanitary standard. The design theory and calculation formulas were derived in detail and were utilized to conduct the design of a ventilation system for a certain tunnel. With the complementary ventilation network, the configuration scale of the fans was calculated and the economic benefits were analyzed. The results in? dicate the complementary ventilation technology can not only meet the tunnel ventilation demand but also reduce the initial investment and operating costs for ventilation without any ventilation shafts.
Abstract：
In light of an unbalanced ventilation load between the left tube and right tube of 4~7 km-long tunnels, a new method named twin-tube complementary ventilation is presented. Two air exchange cross channels were set up between the left tunnel tube and right tunnel tube, and extra jet fans were installed in the downhill tunnel in order to transport the surplus fresh air to the uphill tunnel through one air exchange cross channel to attenuate the pollutant concentrations and make the polluted air in the uphill tunnel flow into the downhill tunnel through another air exchange cross channel and reduce the air velocity in the uphill tunnel, by which the air quality of the two tunnel tubes can meet the relative sanitary standard. The design theory and calculation formulas were derived in detail and were utilized to conduct the design of a ventilation system for a certain tunnel. With the complementary ventilation network, the configuration scale of the fans was calculated and the economic benefits were analyzed. The results in? dicate the complementary ventilation technology can not only meet the tunnel ventilation demand but also reduce the initial investment and operating costs for ventilation without any ventilation shafts.
2017, Vol. 54 