煤堆内CO浓度分布与变化规律的数值模拟  

Numerical simulation of concentration distribution and variation rule of CO in coal stockpile

作　　者：刘尹霞[1] 马恒[1] 董子文 

机构地区：[1]辽宁工程技术大学安全科学与工程学院,阜新123000 [2]湖南工学院安全与环境工程学院,衡阳421002

出　　处：《环境工程学报》2017年第11期5963-5971,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51274115;51274113);辽宁省教育厅一般项目(L2012122)

摘　　要：为了明确空隙率和风速等对煤堆长期堆放过程中堆内CO浓度(体积浓度)的影响规律,为煤堆长期堆放过程中和受扰动后的安全及环境问题提供理论支持,使用COMSOLMultiphysics5.0建立二维数值模拟模型,研究了堆内CO浓度随堆放时间、空隙率、风速变化时的分布与变化规律。结果表明,空隙率和风速低时堆内CO分布具有"烟囱"现象,且浓度高,随堆放时间延长堆内最大CO浓度具有"增长-降低-稳定"三段式变化规律,风速低时最大浓度与时间之间服从Gauss Amp函数分布,风速较大或时间较长堆内最大CO浓度基本稳定。To evaluate the effect rules of porosity and wind speed on CO volume concentration in coal stockpile, and provide theoretical supports for the safety and environmental issues in long time stacking process or be dis- turbed. Establish an 2D simulation model by use COMSOL Multiphysics 5.0, the concentration distribution and variation rule of CO in coal stockpile change with stacking time, porosity and wind speed were studied. The re- sults show that, there is a chimney phenomenon and with higher concentration when the porosity and wind speed is low, the maximum CO concentration is three-step change rule of growth-lower-stability with the extension of stacking time. when wind speed is low, there is a Gauss Amp function relationship between stacking time and the maximum CO concentration, but the maximum CO concentration is basically stable when the wind speed is higher and the stacking time is longer.

关 键 词：煤堆 CO 空隙率 风速 “烟囱”现象 GAUSS Amp函数 

分 类 号：X511[环境科学与工程—环境工程]