公路隧道空气幕与射流风机通风方法对比及优化

针对隧道射流通风存在功率利用率低,大浓度尾气调控不理想等问题,运用FLUENT软件,以模拟优化瓮福磷矿隧道的通风系统问题为实例,将射流风机和空气幕引射风流进行风流对比,提出引射风流空气幕替代射流风机加强隧道通风的全新命题。研究结果表明:两种优化风机组合都能达到隧道所需的通风标准,在进行对比过程中,如果总功率一样,引射风流空气幕组合产风量大于射流风机组合,而总功率145.5 kW空气幕组合可产生与总功率180 kW射流风机组合类似的通风效果,且总功率可节约34.5 kW。在风机组合优化过程中,各风机功率分配越平均对风机组合通风效率提升越大,同种功率的风机两两并联,通风效果要优于不同功率风机两两并联。

Ventilation method comparison between air curtain and jet fan in highway tunnels and its optimization

In view of the low power efficiency and mediocre control of high-concentration exhaust gas in tunnel jet ventilation, the FLUENT software is used to simulate and optimize the current ventilation system in Wengfu Phosphate Mine Tunnel. A new proposition is put forward to use the ejection airflow air curtain instead of jet fan to strengthen tunnel ventilation after making comparisons between their airflows. The results show that two optimized fan combinations can meet the ventilation standards required of the tunnel. If the total power is the same, the ejection airflow air curtain combinations produces more air volumes than the jet fan, and the air curtain combinations with a total power of 145.5 kW can produce a similar ventilation effect as the jet fan combinations with a power of 180 kW, saving 34.5 kW in total. In the process of optimizing the fan combinations, it is found that the more even the power distribution of each fan, the greater ventilation efficiency of the fan combinations. The ventilation effect of two fans of the same power in parallel connection is better than that of two fans of different powers in parallel connection.