重载铁路隧道落煤吸尘系统研究
发布时间：2019-05-18 23:00
【摘要】：隧道落煤被认为是重载铁路线上多年未解决的一大顽疾。以大秦铁路线为例,每十分钟左右就得加开一列万吨以上的运煤专列,加之隧道洞口多,一旦列车经过,在气流的扰动下列车上的煤料被卷起,下落到铁路道床上。长时间的堆积,给铁路沿线的维护工作造成严重影响,严重处甚至将铁轨掩埋。传统的在列车顶部加装棚盖法、篷布法、洒化学试剂表面抑尘法等方法效果不是特别良好。针对铁路隧道落煤颗粒小、质量轻、人力人工清理效率低、成本高等问题,设计了一种新型的重载铁路隧道落煤吸尘系统。课题组通过到大秦铁路线进行调研,结合国内外对除尘设备的研究成果及方向,提出了新型的固定式重载铁路隧道落煤吸尘系统设计方案。针对重载铁路隧道落煤吸尘系统的数学模型,在对CFD中各种不同的湍流模型分析后,针对单向流采用非直接数值模拟法进行计算,运用粘涡模型中的RNG k-?模型来模拟三维强旋湍流,得到更佳仿真结果。针对煤料与空气在管道内的气力输送系统,采用欧拉-拉格朗日坐标系下的颗粒轨道模型,将固体颗粒作为离散相,将气体作为连续相处理,运用Navier-Stokes方程进行计算。对重载铁路隧道落煤吸尘系统进行三维建模。对落料装置、输送装置以及吸料装置进行仿真分析以及现场实验论证。(1)在针对落料装置中的旋风分离器进行数值模拟时发现:最小直径大于0.005mm的煤粒在XF-1型旋风分离器内可较好的实现气固分离;(2)在对输送装置的研究中,基于Fluent有限元仿真研究了定长管道上多个支管间距和煤粒入射角对主输送煤料管内流场的影响,支管间距在750mm附近并且煤粒入射角α在小于45°时更加利于铁路隧道落煤的输送;(3)新吸料装置对原有的吸料嘴进行改进,对比分析了新旧吸料装置的仿真结果中的总压力分布、气相速度、粒子轨迹、粒子速度等内容,为后期现场试验提供了理论基础。现场对不同功率大小的重载铁路隧道落煤吸尘系统进行试验研究,得出其煤料的输送效率,与仿真结果进行对比分析,为日后的改进提供依据。
[Abstract]:Falling coal in the tunnel is considered to be a persistent disease that has not been solved for many years on the heavy load railway line. Take the Daqin Railway Line as an example, every ten minutes or so, a special train carrying more than 10,000 tons of coal must be added. In addition, there are many tunnel entrances. Once the train passes by, the coal on the train is rolled up under the disturbance of the airflow and falls to the railway bed. The accumulation for a long time has a serious impact on the maintenance work along the railway, and even buries the tracks in serious places. The traditional methods of adding shed cover, tarpaulin and surface dust suppression on the top of the train are not particularly effective. In order to solve the problems of small coal falling particles, light weight, low manual cleaning efficiency and high cost in railway tunnel, a new type of coal falling cleaning system for heavy load railway tunnel is designed. Through the investigation to Daqin Railway Line and the research results and direction of dust removal equipment at home and abroad, the research group puts forward a new design scheme of coal falling and cleaning system for fixed heavy load railway tunnel. Aiming at the mathematical model of coal falling cleaning system in heavy load railway tunnel, after analyzing various turbulence models in CFD, the indirect numerical simulation method is used to calculate the unidirectional flow, and the RNG k in the viscous vortex model is used. The model is used to simulate the three-dimensional strong rotation turbulence, and the better simulation results are obtained. Aiming at the pneumatic conveying system of coal and air in pipeline, the particle track model in Euler-Lagrangian coordinate system is adopted, the solid particles are used as discrete phase, the gas is treated as continuous phase, and the Navier-Stokes equation is used to calculate. The three-dimensional modeling of coal falling and cleaning system in heavy load railway tunnel is carried out. For the blanking device, The simulation analysis and field experiment demonstration of the conveying device and the suction device are carried out. (1) when the numerical simulation of the cyclone separator in the blanking device is carried out, it is found that the coal particles with the minimum diameter larger than 0.005mm are rotated in XF- 1. The gas-solid separation can be well realized in the air separator. (2) in the research of transportation device, based on Fluent finite element simulation, the influence of multiple branch pipe spacing and coal particle incident angle on the flow field in the main conveying coal pipe is studied. When the distance between branches and pipes is near 750mm and the incident angle 伪 of coal particles is less than 45 掳, it is more beneficial to the transportation of falling coal in railway tunnels. (3) the new suction device improves the original suction nozzle, and compares and analyzes the total pressure distribution, gas phase velocity, particle trajectory, particle velocity and so on in the simulation results of the new and old suction device, which provides a theoretical basis for the field test in the later stage. The coal falling cleaning system of heavy duty railway tunnel with different power is tested and studied on the spot, and the transportation efficiency of coal material is obtained, which is compared with the simulation results, which provides the basis for the improvement in the future.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U453.8
本文编号：2480407
[Abstract]:Falling coal in the tunnel is considered to be a persistent disease that has not been solved for many years on the heavy load railway line. Take the Daqin Railway Line as an example, every ten minutes or so, a special train carrying more than 10,000 tons of coal must be added. In addition, there are many tunnel entrances. Once the train passes by, the coal on the train is rolled up under the disturbance of the airflow and falls to the railway bed. The accumulation for a long time has a serious impact on the maintenance work along the railway, and even buries the tracks in serious places. The traditional methods of adding shed cover, tarpaulin and surface dust suppression on the top of the train are not particularly effective. In order to solve the problems of small coal falling particles, light weight, low manual cleaning efficiency and high cost in railway tunnel, a new type of coal falling cleaning system for heavy load railway tunnel is designed. Through the investigation to Daqin Railway Line and the research results and direction of dust removal equipment at home and abroad, the research group puts forward a new design scheme of coal falling and cleaning system for fixed heavy load railway tunnel. Aiming at the mathematical model of coal falling cleaning system in heavy load railway tunnel, after analyzing various turbulence models in CFD, the indirect numerical simulation method is used to calculate the unidirectional flow, and the RNG k in the viscous vortex model is used. The model is used to simulate the three-dimensional strong rotation turbulence, and the better simulation results are obtained. Aiming at the pneumatic conveying system of coal and air in pipeline, the particle track model in Euler-Lagrangian coordinate system is adopted, the solid particles are used as discrete phase, the gas is treated as continuous phase, and the Navier-Stokes equation is used to calculate. The three-dimensional modeling of coal falling and cleaning system in heavy load railway tunnel is carried out. For the blanking device, The simulation analysis and field experiment demonstration of the conveying device and the suction device are carried out. (1) when the numerical simulation of the cyclone separator in the blanking device is carried out, it is found that the coal particles with the minimum diameter larger than 0.005mm are rotated in XF- 1. The gas-solid separation can be well realized in the air separator. (2) in the research of transportation device, based on Fluent finite element simulation, the influence of multiple branch pipe spacing and coal particle incident angle on the flow field in the main conveying coal pipe is studied. When the distance between branches and pipes is near 750mm and the incident angle 伪 of coal particles is less than 45 掳, it is more beneficial to the transportation of falling coal in railway tunnels. (3) the new suction device improves the original suction nozzle, and compares and analyzes the total pressure distribution, gas phase velocity, particle trajectory, particle velocity and so on in the simulation results of the new and old suction device, which provides a theoretical basis for the field test in the later stage. The coal falling cleaning system of heavy duty railway tunnel with different power is tested and studied on the spot, and the transportation efficiency of coal material is obtained, which is compared with the simulation results, which provides the basis for the improvement in the future.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U453.8
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