对室内超细颗粒物扩散影响因素的数值模拟研究

发布时间：2018-03-19 05:32

本文选题：超细颗粒物运动　切入点：风速　出处：《首都经济贸易大学》2017年硕士论文　论文类型：学位论文

【摘要】：超细颗粒材料目前广泛应用于很多行业,在生产生活中,环境中的超细颗粒粒子可以通过运动进入人体体内,对人体有一定的伤害。同时由于超细颗粒的特殊物理化学性质,超细颗粒物在环境中也容易引起爆炸,进而威胁到人们的生命财产安全。本文以室内空间为模型,超细二氧化钛(TiO_2)颗粒物为实验粒子,分别对室内空间不同风速、不同风向、不同粒径的情况下的室内超细二氧化钛(TiO_2)颗粒物的运动情况进行研究。研究首先建立合适的物理模型与数学求解方法,用Gambit进行网格划分和边界条件设置,使用Fluent等软件分别进行迭代求解和结果处理。其中本次所设计工况分别为:不同风速的情况下超细二氧化钛(TiO_2)颗粒物运动情况、2m/s的风速下门侧以及左右两边窗户侧风向下超细二氧化钛(TiO_2)颗粒物运动情况、在风速2m/s、相同左侧窗户风向下,颗粒物粒径分别为10-7m、10-8m、10-9m情况下超细二氧化钛(TiO_2)颗粒物运动情况。通过对不同时间段超细二氧化钛(TiO_2)颗粒物扩散集中浓度范围、扩散最高浓度范围数值的记录与统计,来研究实验所设计的各个影响因素对于超细二氧化钛(TiO_2)颗粒物的运动情况的影响效果。实验发现风速2m/s时,室内空间的超细二氧化钛(TiO_2)颗粒物除尘的效果要优于风速1m/s时的除尘效果。当其它的外在环境一致时,排风扇位于超细二氧化钛(TiO_2)颗粒物出口对面的情况下即左侧窗户处,超细二氧化钛(TiO_2)颗粒物除尘的效果较其它风向下超细二氧化钛(TiO_2)颗粒物除尘的效果要明显。同等外在情况下,当超细二氧化钛(TiO_2)颗粒物粒径明显减小时,超细二氧化钛(TiO_2)颗粒物粒径越小,超细二氧化钛(TiO_2)颗粒物通风的综合除尘效果越差。
[Abstract]:At present, ultrafine particle materials are widely used in many industries. In production and life, the ultrafine particles in the environment can enter the human body through movement, which is harmful to the human body. At the same time, because of the special physical and chemical properties of the ultrafine particles, In this paper, the indoor space model, ultrafine titanium dioxide TiO-2) particles as experimental particles, the indoor space of different wind speed, different wind direction, The movement of indoor ultrafine TIO _ 2 / TIO _ 2 particles was studied under different particle sizes. Firstly, a suitable physical model and mathematical solution were established, and the mesh and boundary conditions were set up by Gambit. The iterative solution and result processing were carried out by using Fluent and other software respectively. The working conditions of this design were as follows: under different wind speed, the movement of particulate matter was 2m / s, the lower door side and the left and right side windows. The movement of particles in the cross-wind down ultrafine titanium dioxide (TIO _ 2), At the wind speed of 2 m / s, under the same left window wind direction, the particle size is 10 ~ (-7) m ~ (-1) ~ (-8) m ~ (-1) m ~ (-9) m, respectively. Records and statistics of the maximum diffusion concentration range were used to study the effects of various factors designed by the experiment on the movement of ultrafine titanium dioxide (TIO _ 2) particles. The experimental results showed that the wind speed was 2 m / s. In indoor space, the dust removal effect of ultrafine titanium dioxide / TiO-2) particles is better than that of dust removal at 1 m / s wind speed. When the other external environment is the same, the exhaust fan is located opposite the exit of the fine TIO _ 2 / TiO2) particles, that is, the left window. The dust removal effect of ultrafine titanium dioxide (TIO _ 2) particles is more obvious than that of other kinds of particles. Under the same external conditions, when the particle size of ultrafine TIO _ 2 / TiO-2) decreases obviously, The smaller the particle size is, the worse the comprehensive dust removal efficiency is.
【学位授予单位】：首都经济贸易大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X964

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