摘要
为探索在强制通风条件下,炼钢厂工作场所煤气泄漏后在车间内的扩散规律和影响范围,以某炼钢厂为例,建立煤气泄漏扩散数学模型;对其离散格式、边界条件设定和气体性质定义;采用计算流体力学方法模拟煤气泄漏后CO的浓度变化过程以及不同监测点的CO浓度变化分布规律。模拟结果显示:在相同风压下,随着通风时间的增加,CO在呼气带的浓度逐渐降低;随着通风压力的增加,CO在呼气带的浓度降低得更快,特别是在泄漏停止后,通风压力的增加,使空气对流加快,新空气的进入使CO得到迅速的稀释;当通风压力从2 MPa到6 MPa递增时,距离地面1.5 m处6个水平监测点上CO浓度随时间变化无数量级差异;通过0.4 MPa和0.6 MPa压力的对比分析可以看出,0.6MPa通风压力具有明显的趋势变化。
For studying the diffusion principles and incidence of coal gas leaking in steelworks under forced ventilation, with a steelworks as an example, a mathematic diffusion model for coal gas leakage was established on the basis of the setting of dispersion form and limit conditions and the definition of gas features. Then, the varying process of CO＇s concentration and the distribution rules of CO＇s concentration in different monitoring sites after coal gas leaking were simulated through using Computational Fluid Dynamics method. It shows that, under the same wind pressure, the concentration of CO in exhalation zone will gradually decrease with the increasing of ventilation time; with the increasing of ventilation pressure, the concentration of CO will decrease more quickly, especially after the stop of the leakage. When the ventilation pressure increases from 2 MPa to 6 MPa, there is no variance of order of magnitude for the concentration of CO at 6 level monitoring points which are 1.5 m above the ground. Meanwhile, the comparative analysis of concentration of CO under between 0.4 MPa and 0.6 MPa shows that the concentration of CO under 0.6 MPa has an obvious tendency variation.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2009年第8期96-102,共7页
China Safety Science Journal
关键词
数值模拟
炼钢厂
煤气
工作场所
扩散
numerical simulation
steelworks
coal gas
workplace
diffusion
