高密度内燃牵引单线铁路隧道运营通风模式研究

发布时间：2018-03-22 09:44

  本文选题：铁路隧道　切入点：运营通风　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国内燃牵引铁路普遍用于货物运输,存在着集约化和高密度化的发展趋势,而一直以来,我国没有可以用来直接判断内燃牵引单线铁路隧道采取何种机械通风方式的方法和依据,对斜井分段式通风方式的研究也存在诸多不足,这对高密度运营的铁路隧道运营通风的设计造成一定困难。对此本文以某类型内燃牵引单线铁路隧道为研究对象,对其运营通风模式展开研究。首先依据单线铁路隧道运营通风的特点,建立了一维不可压缩非恒定流和带流动污染源的不稳定流物理模型;建立了连续性方程、动量方程和对流扩散方程数学模型;完善了单线铁路隧道运营通风的相关数值计算程序;分析了污染物排放强度的确定方法及污染物浓度控制标准。通过数值计算,模拟了具体隧道采取相应通风模式时风速变化情况和污染物浓度分布,进而确定隧道污染物浓度达标时间,对不同长度不同通风要求的隧道依次进行自然通风、全射流纵向通风和斜井分段式纵向通风模式的研究。研究结果表明:(1)某类型隧道允许通风时间为15min时,若列车速度为120km/h,能够实现自然通风的最大隧道长度为2920m;若列车速度为70km/h时,能够实现自然通风的最大隧道长度约为2100m。(2)某类型隧道采取全射流纵向通风方式是否适用可用允许通风时间和最小达标时间的大小关系来判断,最小达标时间为Tmin=0.00143Ltu-0.011Vtr-0.52,当允许通风时间TT≥Tmin时,采取全射流纵向通风适用,反之全射流纵向通风不适用。(3)所研究某高密度运营具体隧道设计条件下采取单斜井通风不能满足通风要求。当列车速度为38km/h时,斜井的较优位置位于距离隧道入口 2Ltu/3处,采取排风式比送风式更为合理;隧道采取双斜井送排式通风模式时,较适宜的斜井间距在2Ltu/5到Ltu/2之间;当隧道需要双向通风时,可以采取双斜井单排式通风模式,较适宜的斜井间距为2Ltu/5。对于所研究的某特长隧道设计条件下通风风速超标,不满足通风要求。在采取三斜井分段式通风、70km/h设计时速下,建议将2#、4#和5#辅助通道作为通风井,采取排送排的通风模式,此时通过调节风机压力能够使风速不超过8m/s,达标时间低于7.9min,从而满足该隧道通风要求。
[Abstract]:China's internal combustion traction railway is widely used in freight transportation, there is a trend of intensive and high-density development, and has always been, In our country, there is no direct method and basis for judging which mechanical ventilation mode should be adopted in single-track railway tunnel with internal combustion traction, and there are many deficiencies in the study of segmental ventilation in inclined wells. This makes it difficult to design the ventilation of railway tunnel with high density operation. In this paper, a certain type of single-track railway tunnel with internal combustion traction is taken as the research object. First of all, according to the characteristics of operating ventilation of single-track railway tunnel, the physical model of one-dimensional incompressible unsteady flow and unstable flow with flowing pollution source is established, and the continuity equation is established. The mathematical model of momentum equation and convection-diffusion equation, the relative numerical calculation program of operating ventilation of single-track railway tunnel, the determination method of pollutant emission intensity and pollutant concentration control standard are analyzed. The variation of wind speed and the distribution of pollutant concentration are simulated when the specific tunnel adopts the corresponding ventilation mode, and then the time of reaching the standard of pollutant concentration in the tunnel is determined, and the tunnel with different lengths and different ventilation requirements is naturally ventilated in turn. A study on the Longitudinal ventilation of full Jet and the segmented Longitudinal ventilation in inclined Shaft. The results show that when the allowable ventilation time of a certain type of tunnel is 15min, If the train speed is 120 km / h, the maximum tunnel length for natural ventilation is 2920 m; if the train speed is 70km/h, The maximum tunnel length of natural ventilation is about 2100m.m-2) whether a type of tunnel is suitable for full-jet longitudinal ventilation can be judged by the relationship between the allowable ventilation time and the minimum standard time. The minimum time to reach the standard is 0.00143Ltu-0.011Vtr-0.52. when the ventilation time TT 鈮，

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