纵向通风隧道正常运营CO浓度限值计算

我国《公路隧道通风照明设计规范》与国外标准对隧道内CO浓度限值的设定在计算方法和取值上都存在差异.针对射流风机式及竖井送排与射流风机组合式纵向通风隧道CO浓度分布特性,基于差分形式的Coburn-Forster-Kane方程(CFK方程),拟合了两类典型纵向通风隧道正常运营CO浓度限值计算式.结果表明:尽管两类隧道具有不同的CO浓度分布特性,工程中可按相同的限值设计;对于长隧道,我国应设定更严格的限值标准.

Predicting Permissible CO Concentration Limit for Longitudinal Ventilation Tunnels under Normal Case

The current Chinese code, Specifications for Design of Ventilation and Lighting in Highway Tunnel, lists the admissible CO mass concentration limits for tunnel, which varies from international standards on both values and principles. Two typical types of longitudinal ventilation tunnel are longitudinal ventilation tunnel with jet fan(s) and longitudinal ventilation tunnel with jet fan(s) and vertical shaft(s). Difference form of Coburn Forster Kane equation (CFK equation) is introduced to calculate the CO mass concentration limits for those two types of longitudinal ventilation tunnel and a fitting equation for predicting permissible CO mass concentration limits is presented and is applicabe to both types of tunnel. The results show that the CO mass concentration limit values for long length longitudinal ventilation tunnel should be lower.