地铁非载客运行联络线区间隧道火灾通风排烟方案研究

Research on ventilation and smoke exhaust scheme for tunnel fire in non-operating connection line of metro

地铁非载客运行联络线区间防排烟设计方案一般采用在联络线区间设置射流风机辅助排烟,该方案需要在联络线区间隧道安装2台射流风机,但运营期间射流风机巡检维护困难,存在较大安全隐患。采用SES数值模拟和现场实际测量相结合的研究方法,对郑州地铁1号、2号线联络线区间火灾工况下的通风排烟方案进行研究,对比分析7种不使用射流风机通风排烟工况的排烟效果。研究结果表明,该联络线区间隧道实际火灾工况下,在不开启射流风机时,排风车站需要4台隧道风机全部开启排烟,送风车站至少开启2台隧道风机送风,可确保排烟风速大于临界风速,满足区间隧道通风排烟要求,为减少运营维护工作量,降低轨行区安全隐患,可以取消射流风机。此外,分析送风机和排风机开启数量对通风排烟效果的影响。结果表明,开启风机数量相同的情况下,增开排风机的通风排烟效果优于送风机,且风机开启数量较小时,增开排风机的作用效果更明显。

The smoke control and exhaust design scheme for non-operating of metro connecting lines generally adopts the method of installing jet fans to assist in smoke exhaust.This scheme generally requires two sets of jet fan in the tunnel of the connecting line section.There are significant hidden dangers due to the difficulty of inspection and maintenance for these jet fans during operation.A research method combining SES numerical simulation and on-site actual measurement was adopted to study the ventilation and smoke exhaust schemes under the fire conditions of the connecting lines in Zhengzhou metro line 1 and line 2.The smoke exhaust effects by seven types of ventilation and smoke exhaust conditions without using jet fans were compared and analyzed.The research results showed that,when the jet fans were not turned on under the actual fire conditions in connecting line tunnel,if all four tunnel ventilation fans at the exhaust station needed to be turned on for smoke exhaust,and at least two tunnel ventilation fans needed to be turned on for air supply at the supply station,It could ensure that the smoke exhaust wind speed was greater than the critical speed and meet the ventilation and smoke exhaust requirements of the sections.Jet fans can be eliminated to reduce the workload of operation and maintenance and reduce the hidden dangers in the track area.Simultaneously analyzing the impact of the number of running supply and exhaust fans on the ventilation and smoke exhaust effect,the results show that,with the same number of running fans,the ventilation and smoke exhaust effect of adding exhaust fans is better than that of supply fans.Moreover,when the number of running fans is fewer,the effect of adding exhaust fans is more significant.