煤堆内CO浓度分布与变化规律的数值模拟
发布时间：2018-07-27 18:31
【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。
[Abstract]:In order to clarify the influence of porosity and wind speed on the concentration (volume concentration) of CO in the coal pile during the long-term stacking process, this paper provides theoretical support for the safety and environmental problems during the long-term stacking process and after disturbance. A two-dimensional numerical simulation model was established with COMSOLMultiphysics5.0 to study the distribution and variation of CO concentration with storage time, porosity and wind speed. The results show that the distribution of CO in the reactor has the phenomenon of "chimney" when the porosity and wind speed are low, and the concentration is high. The maximum concentration of CO in the reactor varies with the increase, decrease and stability with the increase of the stacking time. When the wind speed is low, the maximum concentration and time are distributed according to the Gauss Amp function, and the maximum CO concentration in the reactor is stable when the wind speed is larger or the time is longer.
【作者单位】： 辽宁工程技术大学安全科学与工程学院;湖南工学院安全与环境工程学院;
【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)
【分类号】：X511
本文编号：2148768
[Abstract]:In order to clarify the influence of porosity and wind speed on the concentration (volume concentration) of CO in the coal pile during the long-term stacking process, this paper provides theoretical support for the safety and environmental problems during the long-term stacking process and after disturbance. A two-dimensional numerical simulation model was established with COMSOLMultiphysics5.0 to study the distribution and variation of CO concentration with storage time, porosity and wind speed. The results show that the distribution of CO in the reactor has the phenomenon of "chimney" when the porosity and wind speed are low, and the concentration is high. The maximum concentration of CO in the reactor varies with the increase, decrease and stability with the increase of the stacking time. When the wind speed is low, the maximum concentration and time are distributed according to the Gauss Amp function, and the maximum CO concentration in the reactor is stable when the wind speed is larger or the time is longer.
【作者单位】： 辽宁工程技术大学安全科学与工程学院;湖南工学院安全与环境工程学院;
【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)
【分类号】：X511
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