双洞互补式通风在公路隧道中的应用

Application of Twin-Tube Complementary Ventilation in Highway Tunnels

针对4~7 km长隧道左右线通风负荷不平衡的问题,文章提出了一种新型的隧道通风方式——双洞互补式通风,在左右线隧道之间设置两条换气通道,在下坡隧道内设置富余的射流风机,将下坡隧道富余的新鲜空气通过换气通道送入上坡隧道,稀释上坡隧道污染物浓度;同时将上坡隧道污染空气通过横通道送入下坡隧道,降低下坡隧道内风速,从而使两条隧道内空气质量均能满足卫生标准。文章详细推导了该通风方式的设计理论和计算公式,运用公式对某隧道进行通风优化设计,利用通风网络计算风机配置规模,分析其经济效益。结果表明:采用该通风方式,可以在无需修建通风井的情况下,满足隧道内通风要求,从而减少初期投资和运营管理费用,经济效益显著。研究成果对公路隧道通风方式的选择提供了新的途径。

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 ex- change 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.